@article {1070, title = {An Adaptive Method for Camera Attribution Under Complex Radial Distortion Corrections}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {19}, year = {2024}, pages = {385-400}, keywords = {Adaptation models, adaptive processing, cameras, Distortion, distortion correction, Fingerprint recognition, forensics, Image forensics, Lenses, PCE, photo response non-uniformity, PRNU, radial correction, Smart phones, source attribution}, doi = {10.1109/TIFS.2023.3318933}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=10265255}, author = {Montibeller, Andrea and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {1060, title = {Multibeam Compact Dual Reflectarray Antenna for High-Throughput Satellites in Ka-Band}, booktitle = {18th European Conference on Antennas and Propagation}, year = {2024}, author = {Daniel Mart{\'\i}nez-de-Rioja and Eduardo Mart{\'\i}nez-de-Rioja and Y Rodr{\'\i}guez-Vaqueiro and A Pino and Carlos Mosquera and Jos{\'e} A. Encinar and Giovanni Toso} } @conference {1075, title = {Radio Maps for Beam Alignment in mmWave Communications with Location Uncertainty}, booktitle = {IEEE 99th Vehicular Technology Conference: VTC2024-Spring. Workshop "Radio Map for 6G Communications"}, year = {2024}, month = {accepted}, address = {Singapore}, abstract = {
Abstract{\textemdash}Next generation communication systems require
accurate beam alignment to counteract the impairments that
characterize propagation in high-frequency bands. The overhead
of the pilot sequences required to select the best beam pair is
prohibitive when codebooks contain a large number of beams, as
is the case in practice. To remedy this issue, some schemes exploit
information about the user location to predict the best beam pair.
However, these schemes (i) involve no measurements whatsoever,
which generally results in a highly suboptimal predicted beam,
and (ii) are not robust to localization errors. To address these
limitations, this paper builds upon the notion of radio map to
develop two algorithms that attain a balance between the quality
of the obtained beam pair and measurement overhead. The
proposed algorithms predict the received power corresponding to
each pair and measure just the Q pairs with highest prediction.
While the first algorithm targets simplicity, the second one
relies on a Bayesian approach to endow the prediction process
with robustness to localization error. The performance of both
algorithms is shown to widely outperform existing methods using
ray-tracing data.
}, keywords = {mayte, mmWave, radio maps}, author = {Tien, Ngoc-Ha and Daniel Romero and R. L{\'o}pez-Valcarce} } @article {1066, title = {Sidelobe Suppression for Multicarrier Signals via Structured Spectral Precoding}, journal = {IEEE Transactions on Communications}, year = {2024}, month = {accepted}, abstract = {
Reducing the large sidelobes of multicarrier signals
is crucial to prevent adjacent channel interference. Spectral
precoding is an effective approach toward this goal, at the
expense of throughput loss due to precoder redundancy; thus,
it is of interest to explore alternative precoder designs with
improved performance at lower redundancies. We present a
novel precoder which minimizes radiated power within a userselectable
frequency region. The structure of the precoding
matrix is chosen to allow efficient mitigation of in-band distortion
at the receiver by means of iterative and successive interference
cancellation, while completely avoiding distortion to protected
and pilot subcarriers. By exploiting the low-rank properties of
constituent blocks, computational complexity can be significantly
reduced with little impact on sidelobe reduction. Simulation
results show the benefits of the proposed design, which is
particularly effective in redundancy-limited settings targeting
high spectral efficiency.
}, keywords = {mayte, multicarrier communications, OFDM, spectrum shaping}, doi = {10.1109/TCOMM.2024.3357429}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce and Francesc Rey and Josep Sala and Javier Villares} } @conference {1061, title = {Clock and Orientation-Robust Simultaneous Radio Localization and Mapping at Millimeter Wave Bands}, booktitle = {2023 IEEE Wireless Communications and Networking Conference (WCNC)}, year = {2023}, pages = {1-7}, doi = {10.1109/WCNC55385.2023.10119129}, author = {Gomez-Cuba, Felipe and Feijoo-Rodr{\'\i}guez, Gonzalo and Gonz{\'a}lez-Prelcic, Nuria} } @article {1055, title = {Contribution of non-orthogonal multiple access signalling to practical multibeam satellite deployments}, journal = {International Journal of Satellite Communications and Networking}, year = {2023}, doi = { https://doi.org/10.1002/sat.1492}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera} } @conference {1059, title = {Direction of Arrival Estimation with Hybrid Digital Analog Arrays: Algorithms and Ziv-Zakai Lower Bound}, booktitle = {Asilomar Conference on Signals, Systems, and Computers }, year = {2023}, author = {Miguel Rivas-Costa and Carlos Mosquera} } @conference {1072, title = {Exploiting PRNU and Linear Patterns in Forensic Camera Attribution under Complex Lens Distortion Correction}, booktitle = {ICASSP 2023 - 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2023}, pages = {1-5}, keywords = {Acoustic distortion, Camera Attribution, Camera Source Identification, cameras, forensics, GPU, Graphics processing units, interpolation, PRNU, Radial Distortion Correction, Reliability, Software}, doi = {10.1109/ICASSP49357.2023.10096605}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=10096605}, author = {Montibeller, Andrea and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {1054, title = {Frequency-selective hybrid beamforming for mmWave full-duplex}, booktitle = {IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)}, year = {2023}, address = {Rhodes, Greece}, abstract = {
We study beamforming cancellation for a full-duplex (FD) wideband millimeter wave (mmWave) point-to-point bidirectional link in which both multicarrier-based nodes transmit and receive simultaneously and on the same frequency. The focus is on hybrid architectures in which the analog subblock of the beamformer, common to all subcarriers, is fully-connected and based on phase shifters with finite resolution, to avoid frontend saturation by mitigating FD-induced self-interference in the analog domain.
}, keywords = {full-duplex, mmWave, rodin}, doi = {10.1109/ICASSP49357.2023.10094826}, author = {Andrea Guamo-Morocho and R. L{\'o}pez-Valcarce} } @article {1069, title = {Information Forensics and Security: A quarter-century-long journey}, journal = {IEEE Signal Processing Magazine}, volume = {40}, year = {2023}, pages = {67-79}, keywords = {forensics, History, Information processing, Information security, Intellectual property, Machine Learning, privacy, Signal processing, Surveillance}, doi = {10.1109/MSP.2023.3275319}, url = {https://ieeexplore.ieee.org/document/10188887}, author = {Barni, Mauro and Campisi, Patrizio and Delp, Edward J. and Do{\"e}rr, Gwena{\"e}l and Fridrich, Jessica and Memon, Nasir and Fernando P{\'e}rez-Gonz{\'a}lez and Rocha, Anderson and Verdoliva, Luisa and Wu, Min} } @conference {1063, title = {Introducing the TRUMPET project: TRUstworthy Multi-site Privacy Enhancing Technologies}, booktitle = {IEEE International Conference on Cyber Security and Resilience (CSR)}, year = {2023}, pages = {604-611}, publisher = {IEEE}, organization = {IEEE}, address = {Venice, Italy}, isbn = {979-8-3503-1170-9}, doi = {https://doi.org/10.1109/CSR57506.2023.10224961}, author = {Alberto Pedrouzo-Ulloa and Jan Ramon and Fernando P{\'e}rez-Gonz{\'a}lez and Siyanna Lilova and Patrick Duflot and Zakaria Chihani and Nicola Gentili and Paola Ulivi and Mohammad Ashadul Hoque and Twaha Mukammel and Zeev Pritzker and Augustin Lemesle and Jaime Loureiro-Acu{\~n}a and Xavier Mart{\'\i}nez and Gonzalo Jim{\'e}nez-Balsa} } @article {1047, title = {Link Adaptation for Rate Splitting Systems with Partial CSIT}, journal = {IEEE Journal on Selected Areas in Communications}, year = {2023}, doi = {10.1109/JSAC.2023.3240787}, author = {Carlos Mosquera and Felipe G{\'o}mez-Cuba} } @conference {1058, title = {Overview of Use Cases in Single Channel Full Duplex Techniques for Satellite Communication}, booktitle = {40th International Communications Satellite Systems Conference (ICSSC)}, year = {2023}, author = {V{\'\i}ctor Monz{\'o}n Baeza and Carlos Mosquera and Roberto L{\'o}pez-Valcarce and JL Gonz{\'a}lez-R{\'\i}os and JA Vasquez-Peralvo and Tom{\'a}s Ram{\'\i}rez and P Losada and JC Merlano and S Chatzinotas and Steven Kisseleff} } @conference {1064, title = {Practical Multi-Key Homomorphic Encryption for More Flexible and Efficient Secure Federated Average Aggregation}, booktitle = {IEEE International Conference on Cyber Security and Resilience (CSR)}, year = {2023}, pages = {612-617}, publisher = {IEEE}, organization = {IEEE}, address = {Venice, Italy}, isbn = {979-8-3503-1170-9}, doi = {https://doi.org/10.1109/CSR57506.2023.10224961}, author = {Alberto Pedrouzo-Ulloa and Aymen Boudguiga and Olive Chakraborty and Renaud Sirdey and Oana Stan and Martin Zuber} } @article {1068, title = {Source camera attribution via PRNU emphasis: Towards a generalized multiplicative model}, journal = {Signal Processing: Image Communication}, volume = {114}, year = {2023}, issn = {0923-5965}, doi = {https://doi.org/10.1016/j.image.2023.116944}, url = {https://www.sciencedirect.com/science/article/pii/S0923596523000267}, author = {Fern{\'a}ndez-Mendui{\~n}a, Samuel and Fernando P{\'e}rez-Gonz{\'a}lez and Miguel Masciopinto} } @mastersthesis {1076, title = {Spectrum Shaping Techniques for Advanced Multicarrier Communication Systems}, volume = {PhD}, year = {2023}, month = {06/2023}, school = {Universidade de Vigo}, address = {Vigo}, abstract = {
Mobile communication has evolved from 1G voice-focused systems to 4G
data and mobile broadband services, with the exponential increase in mobile
data volume and connected devices leading to the development of the Fifth
Generation (5G) mobile network. The 5G network is expected to improve
key performance indicators such as data rate, massive connectivity, latency,
network reliability, and energy efficiency. To meet these requirements, the
5G air interface must be highly flexible, spectrally efficient, reliable, scalable,
and energy-efficient.
Among various waveforms proposed for the 5G radio interface, CPOFDM
was chosen due to its inherent advantages such as robustness to
multipath, compatibility with MIMO, low complexity, and high spectral efficiency.
However, it suffers from large spectrum sidelobes, peak-to-averagepower-
ratio, and sensitivity to synchronization errors. The focus of this
thesis is on the large spectrum sidelobes of OFDM that cause high out-ofband
radiation resulting in adjacent channel interference. Therefore, reducing
spectral leakage to adjacent channels is crucial for efficient spectrum
utilization.
Numerous techniques for reducing out-of-band radiation (OBR) have
been proposed in the literature, each with its advantages and drawbacks.
The performance of an OBR reduction technique is not only measured by
its ability to suppress out-of-band emission but also by key performance indicators
(KPIs) such as computational complexity, spectral efficiency, in-band
distortion, and spectrum overshoot. Balancing key performance indicators
(KPIs) is crucial when reducing OBR since it typically involves a tradeoff
between one or more performance parameters. However, the tradeoffs are
not uniform across different OBR reduction techniques. Thus, it is essential
to strike a balance between the KPIs to meet the varying requirements of
different use-case scenarios.
The thesis presents multiple innovative designs for OBR suppression in
multicarrier systems to prevent adjacent channel interference. These designs
offer the flexibility to select a frequency range through a spectral weighting
function that prioritizes certain frequencies. Additionally, the proposed designs
are adaptable enough to enable tradeoffs among the aforementioned
KPIs to fulfill the diverse requirements of various applications and scenarios.
An effective time-domain windowing technique is proposed that that is
both effective and simple, and transparent at the receiver. The proposed optimal
window design has the flexibility to shape the power spectral density
to focus on OBR at the frequency ranges of interest, unlike traditional windowing
approaches. Additionally, the design optimizes OBR performance
across different frequency regions based on the system{\textquoteright}s requirements. The
thesis also presents novel frequency-domain spectral precoding approaches
that can tradeoff between OBR performance and complexity, which is especially
of interest for battery-operated or low-power devices. The proposed
design allows for control over the amount of distortion on data subcarriers,
which is determined by a user-selectable parameter, and influences receiver
complexity.
A joint spectral precoding and windowing design is also presented that
leverages the advantages of both approaches. By optimizing the precoder
and window coefficients to reduce radiated power within a specified frequency
range, the design achieves a superior trade-off between out-of-band
radiation (OBR), throughput, and complexity compared to using these techniques
individually. The results demonstrate the effectiveness of this approach.
Finally, the thesis presents memory-based precoding approach to
mitigate the issue of large sidelobes. By incorporating memory into the precoder,
out-of-band radiation (OBR) performance can be improved without
compromising spectral efficiency, albeit at the expense of increased computational
complexity. The novel memory-based precoder is designed to
minimize the total OBR within a user-defined frequency range. Additionally,
this technique enables control over spectral peaks, thereby allowing for
flexible OBR levels.

}, author = {Khawar Hussain} } @conference {1073, title = {Towards Traitor Tracing in Black-and-White-Box DNN Watermarking with Tardos-Based Codes}, booktitle = {2023 IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2023}, pages = {1-6}, keywords = {Artificial neural networks, black-box, Closed box, Codes, Data security, DNN watermarking, Fingerprinting, forensics, Tardos codes, Training, Traitor tracing, watermarking, white-box}, doi = {10.1109/WIFS58808.2023.10374879}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=10374879}, author = {Elena Rodr{\'\i}guez-Lois and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {1031, title = {Contribution of NOMA Signalling to Practical Multibeam Satellite Deployments}, booktitle = {11th Advanced Satellite Multimedia Conference and 17th Signal Processing for Space Communications Workshop}, year = {2022}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera} } @conference {1029, title = {A Critical Look into Quantization Table Generalization Capabilities of CNN-based Double JPEG Compression Detection}, booktitle = {EUSIPCO}, year = {2022}, address = {Belgrade, Serbia}, abstract = {
Double JPEG compression detection has become a core issue in image forensics, as it provides information about the processing history of the image and its authenticity. Several recent works address this problem by exploiting the potential of CNNs  to achieve state-of-the-art performance on test datasets. Unfortunately, those schemes are typically tailored to their specific training conditions and suffer a significant drop of performance in real-life scenarios. This paper aims at assessing the influence of quantization table mismatch (with regards to those seen in training) in the detection of double JPEG compression. Experimental results show inconsistency between different sets of quantization tables, with trained models yielding significantly worse results on unknown sets. This effect is also evident in a more realistic setting, where it appears to be more noticeable for sources falling in operating regions with greater inconsistency.
}, keywords = {Convolutional Neural Networks, Double JPEG compression, Image forensics, Source heterogeneity}, author = {Elena Rodr{\'\i}guez-Lois and David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a} } @conference {1026, title = {A Dynamic Codebook Design for Analog Beamforming in MIMO LEO Satellite Communications}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2022}, author = {Joan Palacios and Nuria Gonz{\'a}lez-Prelcic and Carlos Mosquera} } @article {1048, title = {Efficient protocols for oblivious linear function evaluation from ring-LWE}, journal = {Journal of Computer Security}, volume = {30}, year = {2022}, month = {01/2022}, pages = {40}, chapter = {39}, issn = {0926-227X}, doi = {10.3233/JCS-200116}, author = {Carsten Baum and Daniel Escudero and Alberto Pedrouzo-Ulloa and Peter Scholl and Juan Ram{\'o}n Troncoso-Pastoriza} } @article {1027, title = {Flexible User Mapping for Radio Resource Assignment in Advanced Satellite Payloads}, journal = {IEEE Transactions on Broadcasting}, year = {2022}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Nader Alagha} } @article {1024, title = {Full-duplex mmWave MIMO with finite-resolution phase shifters}, journal = {IEEE Trans. Wireless Communications}, volume = {21}, year = {2022}, month = {11/2022}, pages = {8979-8994}, abstract = {
Enabling simultaneous transmission and reception on the same carrier frequency, i.e., full-duplex (FD) communication, critically requires that the self-interference (SI) be sufficiently suppressed. We investigate the design of precoders and combiners for an FD millimeter wave point-to-point bidirectional link, where dense antenna arrays provide an opportunity for SI suppression via beamforming cancellation. In practice the precoders and combiners are usually implemented in a hybrid digital/analog fashion with a reduced number of radio frequency (RF) chains, and it becomes necessary to overcome a number of limitations imposed by this structure. We focus on a hybrid architecture with a phase shifter-based fully-connected analog stage, assuming finite-resolution phase shifters. To avoid analog-to-digital converter saturation at the receiver, the proposed design aims at cancelling SI at the analog combiner output. Although accurate SI suppression is difficult with low-resolution phase shifters, our design is able to provide reasonable performance, significantly improving upon previous approaches, and allowing to efficiently exploit the availability of RF chains to partially compensate for coarse phase quantization effects.
}, keywords = {full-duplex, mmWave, rodin}, issn = {1536-1276}, doi = {10.1109/TWC.2022.3171664}, author = {R. L{\'o}pez-Valcarce and M. Mart{\'\i}nez-Cotelo} } @article {1028, title = {General Form of the Power Spectral Density of Multicarrier Signals}, journal = {IEEE Communications Letters}, volume = {26}, year = {2022}, month = {08/2022}, pages = {1755-1759}, chapter = {1755}, abstract = {
Multicarrier modulation has been adopted in many modern communication systems because of its many appealing\ 
properties. Its relatively high out-of-band radiation has spurred many techniques to shape the power spectral density (PSD)\ 
of multicarrier signals, including spectral precoding and pulse shaping. We derive a general expression for the PSD which is\ 
valid for subcarrier-specific pulses and for spectral precoders operating over multiple blocks. The only statistical assumptions\ 
on the vector-valued sequence modulating the active subcarriers are wide-sense cyclostationarity and properness. The applicability\ 
of the result to a number of popular multicarrier formats is discussed.
}, keywords = {rodin, spectrum shaping}, doi = {10.1109/LCOMM.2022.3181728}, author = {R. L{\'o}pez-Valcarce} } @conference {1071, title = {Gpu-Accelerated Sift-Aided Source Identification of Stabilized Videos}, booktitle = {2022 IEEE International Conference on Image Processing (ICIP)}, year = {2022}, pages = {2616-2620}, keywords = {Codes, Deep Learning, estimation, forensics, GPU, Graphics processing units, Image processing, PRNU, SIFT, Video Source Identification, Video Stabilization, Visualization}, doi = {10.1109/ICIP46576.2022.9897579}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=9897579}, author = {Montibeller, Andrea and Pasquini, Cecilia and Boato, Giulia and Dell{\textquoteright}Anna, Stefano and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {1009, title = {Hybrid Beamforming Designs for Frequency-Selective mmWave MIMO Systems with Per-RF chain or Per-antenna Power Constraints}, journal = {IEEE Trans. Wireless Communications}, volume = {21}, year = {2022}, month = {08/2022}, pages = {5770-5784}, chapter = {5770}, abstract = {
Configuring precoders and combiners is a major
challenge to deploy practical multiple-input multiple-output
(MIMO) millimeter wave (mmWave) communication systems
with large antenna arrays. Most prior work addresses the problem
focusing on a total transmit power constraint. In practical
transmitters, however, power amplifiers must operate within their
linear range, so that a power constraint applies to each one
of the input signals to these devices. Therefore, precoder and
combiner designs should incorporate per-antenna or per-radio
frequency (RF) chain transmit power constraints. We focus on
such problem for frequency-selective channels with multicarrier
modulation, and assuming hybrid analog/digital architectures
based on fully connected analog blocks implemented with finite resolution
phase shifters. We first derive an all-digital solution
which aims to maximize spectral efficiency. Then, we develop
hybrid precoders and combiners by approximately matching
the corresponding all-digital matrices while still enforcing the
power constraints. Numerical results show that the proposed
all-digital design performs close to the upper bound given
by the standard waterfilling-based solution with a total power
constraint. Additionally, the hybrid designs exhibit a moderate
loss even when low-resolution phase shifters are considered.
}, keywords = {mmWave, rodin}, doi = {10.1109/TWC.2022.3142959}, author = {R. L{\'o}pez-Valcarce and Nuria Gonz{\'a}lez-Prelcic} } @article {1030, title = {Joint Precoder and Window Design for OFDM Sidelobe Suppression}, journal = {IEEE Communications Letters}, volume = {26}, year = {2022}, month = {12/2022}, pages = {3044-3048}, abstract = {

Spectral precoding and windowing are two effective approaches to reduce out-of-band radiation (OBR) in multicarrier systems. Their performance comes at the price of reduced throughput and additional computational complexity, so there is strong motivation for simultaneously using both techniques. We present a novel design that jointly optimizes the precoder and window coefficients to minimize radiated power within a user-selectable frequency region. Results show that the proposed design achieves a better OBR/throughput/complexity tradeoff than either of these individual techniques separately.

}, keywords = {rodin, spectrum shaping}, doi = {10.1109/LCOMM.2022.3203521}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @conference {1025, title = {Orthogonal precoding with memory for sidelobe suppression in OFDM}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2022}, abstract = {
Orthogonal precoding is a very effective approach to reduce out-of-band radiation (OBR) in multicarrier systems in order to avoid adjacent channel interference. This is achieved at the cost of introducing precoder redundancy, which results in throughput loss. Introducing memory in the precoding operation has the potential to improve performance without sacrificing additional spectral efficiency, in exchange for extra computational complexity. We present a novel orthogonal memory precoder which minimizes OBR within a user-selectable frequency region and allows for controlling spectral overshoot. Decision-feedback decoding avoids symbol error rate degradation at the receiver.
}, keywords = {rodin, spectrum shaping}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @conference {1049, title = {Secure Collaborative Camera Attribution}, booktitle = { European Interdisciplinary Cybersecurity Conference (EICC)}, year = {2022}, pages = {97-98}, publisher = {ACM}, organization = {ACM}, address = {Barcelona, Spain}, isbn = {978-1-4503-9603-5}, doi = {https://doi.org/10.1145/3528580.3532993}, author = {Alberto Pedrouzo-Ulloa and Fernando P{\'e}rez-Gonz{\'a}lez and David V{\'a}zquez-Pad{\'\i}n} } @article {1032, title = {The SIMO Block Rayleigh Fading Channel Capacity Scaling With Number of Antennas, Bandwidth, and Coherence Length}, journal = {IEEE Journal on Selected Areas in Information Theory}, volume = {3}, year = {2022}, pages = {54{\textendash}68}, doi = {10.1109/JSAIT.2022.3157519}, author = {Gomez-Cuba, Felipe} } @conference {996, title = {Analog beamforming for full-duplex mmWave communication with low-resolution phase shifters}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2021}, month = {06/2021}, address = {Montreal, Canada (Virtual event)}, abstract = {
Full-Duplex (FD) communication has been the object of recent attention, particularly in sub-6 GHz bands. By enabling in-band simultaneous transmission and reception, these techniques present great potential in terms of spectral efficiency, latency, and medium access flexibility, and their extension to millimeter wave (mmWave) bands can be expected to benefit similarly. The dense antenna arrays available in mmWave offer a large number of degrees of freedom which could be exploited towards self-interference (SI) mitigation in FD. However, analog beamforming architectures based on practical phase shifters make this task quite challenging due to the lack of amplitude
control and finite phase resolution. In this context, we consider a single-stream bidirectional point-to-point mmWave FD link, and develop a new analog beamforming design requiring a single radio frequency chain in each direction, explicitly taking into account such hardware-related constraints. Simulation results show that the proposed scheme significantly outperforms previous methods for practical phase shifter resolution values of a few bits.
}, keywords = {full-duplex, mmWave, rodin}, author = {R. L{\'o}pez-Valcarce and M. Mart{\'\i}nez-Cotelo} } @conference {1034, title = {Compressed Sensing Channel Estimation for OTFS Modulation in Non-Integer Delay-Doppler Domain}, booktitle = {2021 IEEE Global Communications Conference (GLOBECOM)}, year = {2021}, pages = {1{\textendash}6}, doi = {10.1109/GLOBECOM46510.2021.9685856}, author = {Gomez-Cuba, Felipe} } @conference {1020, title = {DNN Watermarking: Four Challenges and a Funeral}, booktitle = {2021 ACM Workshop on Information Hiding and Multimedia Security, IH\&MMSEC{\textquoteright}21}, year = {2021}, month = {06/2021}, pages = {189-196}, address = {Virtual Event Belgium}, doi = {https://doi.org/10.1145/3437880.3460399}, url = {http://dl.acm.org/citation.cfm?id=3460399}, author = {Barni, Mauro and Fernando P{\'e}rez-Gonz{\'a}lez and Tondi, Benedetta} } @article {1008, title = {Editorial: Signal Processing for Beyond 5G Non-Terrestrial Networks}, journal = {Frontiers in Space Technologies}, volume = {2}, year = {2021}, issn = {2673-5075}, doi = {10.3389/frspt.2021.780171}, url = {https://www.frontiersin.org/articles/10.3389/frspt.2021.780171/full}, author = {Carlos Mosquera and Pantelis-Daniel Arapoglou} } @conference {1004, title = {Flexible Beam-User Mapping for Multibeam Satellites}, booktitle = {9th European Signal Processing Conference, EUSIPCO 2021}, year = {2021}, address = {Dublin, Irlanda}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Nader Alagha} } @conference {1039, title = {Full-stack Hybrid Beamforming in mmWave 5G Networks}, booktitle = {2021 19th Mediterranean Communication and Computer Networking Conference (MedComNet)}, year = {2021}, pages = {1{\textendash}7}, doi = {10.1109/MedComNet52149.2021.9501238}, author = {Gomez-Cuba, Felipe and Zugno, Tommaso and Kim, Junseok and Polese, Michele and Bahk, Saewoong and Zorzi, Michele} } @conference {1002, title = {Homomorphic SVM Inference for Fraud Detection}, booktitle = {VI Jornadas Nacionales de Investigaci{\'o}n en Ciberseguridad (JNIC)}, year = {2021}, publisher = {Ediciones de la Universidad de Castilla-La Mancha}, organization = {Ediciones de la Universidad de Castilla-La Mancha}, author = {Adri{\'a}n V{\'a}zquez-Saavedra and Gonzalo Jim{\'e}nez-Balsa and Jaime Loureiro-Acu{\~n}a and Manuel Fern{\'a}ndez-Veiga and Alberto Pedrouzo-Ulloa} } @article {1007, title = {A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications }, journal = {Frontiers in Space Technologies}, volume = {2}, year = {2021}, issn = {2673-5075}, doi = {10.3389/frspt.2021.696464}, url = {https://www.frontiersin.org/articles/10.3389/frspt.2021.696464/full}, author = {Joan Palacios and Nuria Gonz{\'a}lez-Prelcic and Carlos Mosquera and Takayuki Shimizu and Chang-Heng Wang} } @article {1016, title = {On the information leakage quantification of camera fingerprint estimates}, journal = {Eurasip Journal on Information Security}, volume = {2021}, year = {2021}, pages = {18}, doi = {https://doi.org/10.1186/s13635-021-00121-6}, url = {https://jis-eurasipjournals.springeropen.com/articles/10.1186/s13635-021-00121-6}, author = {Fern{\'a}ndez-Mendui{\~n}a, Samuel and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {995, title = {Mask-Compliant Orthogonal Precoding for Spectrally Efficient OFDM}, journal = {IEEE Transactions on Communications}, volume = {69}, year = {2021}, month = {03/2021}, pages = {1990-2001}, abstract = {
Orthogonal precoding constitutes a powerful technique to reduce spectrum sidelobes of multicarrier signals. This reduction is bought at the cost of introducing precoder redundancy, which results in some throughput loss and additional precoding/decoding complexity. When the goal is to meet some spectral emission mask constraints, it is desirable to avoid unnecessary sidelobe suppression in order to keep precoder redundancy at a minimum. In this context, we introduce a general framework under which we develop a novel Lagrange multiplier-based mask-compliant orthogonal precoder design targeting minimal redundancy. We also adapt to this framework two previously proposed
designs based on spectral notches and minimum out-of-band emission, respectively, to explicitly incorporate mask constraints. Simulation results are provided to show the effectiveness of the proposed designs under different practical masks for multicarrier wireless systems.
}, keywords = {rodin, spectrum shaping, winter}, doi = {10.1109/TCOMM.2020.3041351}, author = {Ravinder Kumar and Khawar Hussain and R. L{\'o}pez-Valcarce} } @conference {1003, title = {Memory Tricks: Improving Active Interference Cancellation for Out-of-Band power reduction in OFDM}, booktitle = {IEEE Int. Workshop Signal Process. Adv. Wireless Commun. (SPAWC)}, year = {2021}, address = {Lucca, Italy (Virtual event)}, abstract = {

Although active interference cancellation (AIC) is an appealing approach to reduce out-of-band radiation (OBR) in multicarrier systems without distorting data subcarriers, it usually requires a large number of reserved subcarriers to be effective. Introducing memory in AIC precoding may help alleviate this drawback in exchange for some increase in computational complexity. We propose a novel memory AIC precoder which, in contrast to previous schemes, minimizes OBR within a user-selectable frequency region and allows for controlling spectral overshoot.

}, keywords = {rodin, spectrum shaping}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @article {1018, title = {Multiquadratic rings and oblivious linear function evaluation}, journal = {TEMat monogr{\'a}ficos}, volume = {2}, year = {2021}, pages = {83-86}, issn = {2660-6003}, url = {https://temat.es/monograficos/article/view/vol2-p83}, author = {Alberto Pedrouzo-Ulloa} } @conference {1005, title = {Non-Orthogonal Transmission Under Flexible Illumination Patterns For Advanced Satellite Payloads}, booktitle = {38th International Communications Satellite Systems Conference (ICSSC),}, year = {2021}, address = {Washington DC, USA}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Nader Alagha} } @conference {1074, title = {PRNU-leaks: facts and remedies}, booktitle = {2020 28th European Signal Processing Conference (EUSIPCO)}, year = {2021}, pages = {720-724}, keywords = {Degradation, estimation, Europe, Fingerprint, Fingerprint recognition, forensics, information theory, Leakage, Membership inference, privacy, PRNU, Signal processing}, doi = {10.23919/Eusipco47968.2020.9287451}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=9287451}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Fern{\'a}ndez-Mendui{\~n}a, Samuel} } @conference {1001, title = {A Review of "Camera Attribution Forensic Analyzer in the Encrypted Domain"}, booktitle = {VI Jornadas Nacionales de Investigaci{\'o}n en Ciberseguridad (JNIC)}, year = {2021}, publisher = {Ediciones de la Universidad de Castilla-La Mancha}, organization = {Ediciones de la Universidad de Castilla-La Mancha}, author = {Alberto Pedrouzo-Ulloa and Miguel Masciopinto and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {1000, title = {Revisiting multivariate ring learning with errors and its applications on lattice-based cryptography}, journal = {Mathematics}, volume = {9}, year = {2021}, chapter = {858}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Nicolas Gama and Mariya Georgieva and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {997, title = {Space-Time Rate Splitting for the MISO BC with Magnitude CSIT}, journal = {IEEE Transactions on Communications}, year = {2021}, author = {Carlos Mosquera and Nele Noels and Tom{\'a}s Ram{\'\i}rez and M{\`a}rius Caus and Adriano Pastore} } @article {1017, title = {Adam and the Ants: On the Influence of the Optimization Algorithm on the Detectability of DNN Watermarks}, volume = {22}, year = {2020}, month = {12/2020}, pages = {36}, doi = { https://doi.org/10.3390/e22121379}, url = {https://www.mdpi.com/1099-4300/22/12/1379}, author = {Corti{\~n}as-Lorenzo, Betty and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {999, title = {Efficient Protocols for Oblivious Linear Function Evaluation from Ring-LWE}, booktitle = {International Conference on Security and Cryptography for Networks (SCN)}, year = {2020}, publisher = {Springer}, organization = {Springer}, author = {Carsten Baum and Daniel Escudero and Alberto Pedrouzo-Ulloa and Peter Scholl and Juan Ram{\'o}n Troncoso-Pastoriza} } @conference {990, title = {Energy-efficient analog beamforming with short packets in millimeter-wave MIMO systems}, booktitle = {2020 54th Asilomar Conference on Signals, Systems, and Computers, California, 2020}, year = {2020}, address = {Virtual event}, abstract = {
The energy-aware design of fully analog precoders and combiners is investigated in this paper. To that aim, we consider a millimeter-wave short-packet communication scenario where power consumption and hardware complexity constitute relevant factors. User terminals employ a single channel encoder and, at hardware level, they implement analog architectures that combine phase shifters and switches. Additionally, transmitting terminals also leverage a power control system. An energy efficiency figure of merit is considered, and its optimization subject to finite packet-length constraints is tackled cyclically over disconnected feasible sets. Numerical results are reported
firstly, to illustrate the advantages of the proposed short-packet fully analog design, secondly, to compare its performance to that of on-off beamforming, and finally, to discuss the optimality of the proposed optimization algorithm.
}, keywords = {mmWave, rodin}, author = {Jordi Borr{\`a}s and Francesc Molina and R. L{\'o}pez-Valcarce and Josep Sala} } @conference {989, title = {Full-Duplex mmWave Communication with Hybrid Precoding and Combining}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2020}, month = {08/2020}, address = {Amsterdam (Netherlands)}, abstract = {
We investigate the design of hybrid precoders and combiners for a millimeter wave (mmWave) point-to-point bidirectional link in which both nodes transmit and receive simultaneously and on the same carrier frequency. In such full-duplex configuration, mitigation of self-interference (SI) becomes critical. Large antenna arrays provide an opportunity for spatial SI suppression in mmWave. We assume a phase-shifter based, fully connected architecture for the analog part of the precoder and combiner. The proposed design, which aims at cancelling SI in the analog domain to avoid frontend saturation, significantly improves on the performance of previous approaches.
}, keywords = {full-duplex, mmWave, rodin, winter}, author = {R. L{\'o}pez-Valcarce and M. Mart{\'\i}nez-Cotelo} } @article {985, title = {Link Adaptation and SINR errors in Practical Multicast Multibeam Satellite Systems with Linear Precoding}, journal = {International Journal of Satellite Communications and Networking}, year = {2020}, keywords = {link adaptation, multi-beam satellite, precoding, satellite communications}, author = {Anxo Tato and Stefano Andrenacci and Eva Lagunas and Symeon Chatzinotas and Carlos Mosquera} } @conference {998, title = {Multiquadratic Rings and Walsh-Hadamard Transforms for Oblivious Linear Function Evaluation}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2020}, publisher = {IEEE}, organization = {IEEE}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Nicolas Gama and Mariya Georgieva and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {984, title = {Neural Network Aided Computation of Mutual Information for Adaptation of Spatial Modulation}, journal = { IEEE Transactions on Communications}, year = {2020}, abstract = {

Index Modulations, in the form of Spatial Modulation or Polarized Modulation, are gaining traction for both satellite and terrestrial next generation communication systems. Adaptive Spatial Modulation based links are needed to fully exploit the transmission capacity of time-variant channels. The adaptation of code and/or modulation requires a real-time evaluation of the channel achievable rates. Some existing results in the literature present a computational complexity which scales quadratically with the number of transmit antennas and the constellation order. Moreover, the accuracy of these approximations is low and it can lead to wrong Modulation and Coding Scheme selection. In this work we apply a Multilayer Feedforward Neural Network to compute the achievable rate of a generic Index Modulation link. The case of two antennas/polarizations is analyzed in depth, showing not only a one-hundred fold decrement of the Mean Square Error in the estimation of the capacity as compared with existing analytical approximations, but also a fifty times reduction of the computational complexity. Moreover, the extension to an arbitrary number of antennas is explained and supported with simulations. More generally, neural networks can be considered as promising candidates for the practical estimation of complex metrics in communication related settings.

}, keywords = {ACM, Adaptive Communications, Capacity, Index Modulation, link adaptation, Machine Learning, MFNN, Mutual Information, neural networks, Polarized Modulation, Spatial Modulation}, isbn = {1558-0857 }, issn = {0090-6778 }, doi = {https://doi.org/10.1109/TCOMM.2020.2974215}, author = {Anxo Tato and Carlos Mosquera and Pol Henarejos and Ana P{\'e}rez Neira} } @conference {987, title = {Non-coherent rate-splitting for multibeam satellite forward link: practical coding and decoding algorithms}, booktitle = {IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 25-28 May 2020, virtual event.}, year = {2020}, author = {Nele Noels and Marc Moeneclaey and Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and M{\`a}rius Caus and Adriano Pastore} } @conference {981, title = {Optimal window design for W-OFDM}, booktitle = {IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)}, year = {2020}, month = {05/2020}, abstract = {
Windowing is an effective approach to reduce out-of-band radiation (OBR) in multicarrier systems in order to avoid adjacent channel interference. However, commonly used window functions are chosen in an ad hoc manner and fixed. We present an optimal window design for windowed-OFDM minimizing OBR within a given frequency region. The proposed technique is flexible in that it allows to specify the range of frequencies involved in the minimization and to apply spectral weighting. The optimal window can be computed offline.
}, keywords = {spectrum shaping, winter}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @conference {993, title = {On the Performance of Advanced Reflectarray Configurations for Multibeam Satellite Communications}, booktitle = {XXXV Simposio Nacional de la Uni{\'o}n Cient{\'\i}fica Internacional de Radio, URSI 2020}, year = {2020}, author = {Tom{\'a}s Ram{\'\i}rez and Daniel Mart{\'\i}nez de Rioja and Eduardo Mart{\'\i}nez de Rioja and Carlos Mosquera and Jos{\'e} A. Encinar} } @conference {1021, title = {PRNU-leaks: facts and remedies}, booktitle = { 2020 28th European Signal Processing Conference (EUSIPCO)}, year = {2020}, month = {2021}, address = {Virtual Event Amsterdam}, doi = {10.23919/Eusipco47968.2020.9287451}, url = {https://ieeexplore.ieee.org/document/9287451}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Fern{\'a}ndez-Mendui{\~n}a, Samuel} } @conference {986, title = {Resource Management in the multibeam NOMA-based satellite downlink}, booktitle = {45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2020}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera} } @conference {991, title = {Robustness analysis of beamforming based designs for mmWave Full-Duplex Amplify-and-Forward relays}, booktitle = {2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS)}, year = {2020}, month = {12/2020}, abstract = {
We consider the robust design of a millimeter wave MIMO two-hop system in which source, relay and destination are
equipped with large antenna arrays. The relay implements the amplify-and-forward protocol and operates in full-duplex mode,
thus being subjected to self-interference (SI). Imperfect channel state information (CSI) is assumed in all involved links, including
the SI channel, with a deterministic isotropic bounded model on CSI errors. The proposed robust design seeks to maximize
the worst-case spectral efficiency, accommodates both digital and phase shifter-based analog beamforming, and is computationally
simple; moreover, it does not require knowledge of the size of the CSI uncertainty regions.
}, keywords = {full-duplex, mmWave, rodin}, author = {R. L{\'o}pez-Valcarce and M. Mart{\'\i}nez-Cotelo} } @conference {994, title = {Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals}, booktitle = {10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC)}, year = {2020}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Nele Noels and M{\`a}rius Caus and Joan Bas and Luis Blanco and Nader Alagha} } @mastersthesis {992, title = {Synthesis of multiaxis stationary non-Gaussian shaped vibration}, year = {2020}, school = {University of Vigo}, address = {Vigo}, abstract = {
Random vibration is present in many fi elds of engineering, although one where it has particular relevance is the industry of ground transportation. The interaction between the wheels and the road induces vibration that transmits to all the components in the vehicle, as well as to the passengers, producing mechanical damage, noise and discomfort. It is hence important to address the effect of vibration during the design and validation phases of development of the vehicle. For that purpose, a method for the synthesis of signals that can be used for numerical simulation or physical testing of the system being designed is needed. In this thesis, an algorithm for the synthesis of random vibration signals is developed, that takes into account the multiaxial and non-Gaussian nature of the process allowing individual adjustment of the kurtosis of the different degrees-of-freedom involved. The proposed algorithm avoids distortion of the spectrum when the kurtosis is being adjusted hence allowing for independent control of the spectral and kurtosis properties of the process. Theoretical expressions relating the control parameters to the kurtosis and the spectrum of the process are provided. An additional bene fit of the proposed algorithm is the possibility to modify the higher-order moments beyond the kurtosis.
}, keywords = {multiaxial vibration, random vibration, vibration synthesis}, author = {Dami{\'a}n Gonz{\'a}lez} } @article {1019, title = {Temporal Localization of Non-Static Digital Videos Using the Electrical Network Frequency}, journal = {IEEE Signal Processing Letters}, volume = {27}, year = {2020}, month = {04/2020}, pages = {5}, chapter = {745}, doi = {10.1109/LSP.2020.2988145}, url = {https://ieeexplore.ieee.org/document/9072308}, author = {Fern{\'a}ndez-Mendui{\~n}a, Samuel and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {988, title = {Two-Level Frame Precoding with non-Cooperative Gateways}, journal = {EURASIP Journal on Wireless Communications and Networking}, year = {2020}, keywords = {myrada, satcom, winter}, doi = {https://doi.org/10.1186/s13638-020-01757-7}, url = {https://rdcu.be/b5KB3}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and R. L{\'o}pez-Valcarce} } @article {975, title = {Video Integrity Verification and GOP Size Estimation via Generalized Variation of Prediction Footprint}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {15}, year = {2020}, month = {12/2019}, pages = {1815-1830}, chapter = {1815}, abstract = {

The Variation of Prediction Footprint (VPF), formerly used in video forensics for double compression detection and GOP size estimation, is comprehensively investigated to improve its acquisition capabilities and extend its use to video sequences that contain bi-directional frames (B-frames). By relying on a universal rate-distortion analysis applied to a generic double compression scheme, we first explain the rationale behind the presence of the VPF in double compressed videos and then justify the need of exploiting a new source of information such as the motion vectors, to enhance the VPF acquisition process. Finally, we describe the shifted VPF induced by the presence of B-frames and detail how to compensate the shift to avoid misguided GOP size estimations. The experimental results show that the proposed Generalized VPF (G-VPF) technique outperforms the state of the art, not only in terms of double compression detection and GOP size estimation, but also in reducing computational time.

}, keywords = {B-frames, double compression detection, GOP size estimation, rate distortion optimization, video forensics}, author = {David V{\'a}zquez-Pad{\'\i}n and Marco Fontani and Dasara Shullani and Fernando P{\'e}rez-Gonz{\'a}lez and Alessandro Piva and Mauro Barni} } @conference {961, title = {Analog beamforming for full-duplex millimeter wave communication}, booktitle = {16th International Symposium on Wireless Communication Systems (ISWCS)}, year = {2019}, month = {08/2019}, address = {Oulu, Finland}, abstract = {

Full-duplex (FD) communication has the potential for significant improvements in spectral efficiency, as long as the problem of self-interference (SI) can be overcome. For millimeter wave (mmWave) systems with large antenna arrays, beamforming based SI mitigation is attractive because of the large number of degrees of freedom available. Previously proposed precoder-combiner designs, however, suffer from a large performance loss under the hardware-constrained architectures required for operation at mmWave. In this context, we develop a new algorithm for the design of constant-amplitude analog precoders and combiners of an FD mmWave single-stream bidirectional link, significantly reducing the aforementioned performance loss.

}, keywords = {full-duplex, mmWave, winter}, author = {R. L{\'o}pez-Valcarce and Nuria Gonz{\'a}lez-Prelcic} } @conference {962, title = {Beamformer design for full-duplex amplify-and-forward millimeter wave relays}, booktitle = {16th International Symposium on Wireless Communication Systems (ISWCS)}, year = {2019}, month = {08/2019}, address = {Oulu, Finland}, abstract = {

We consider the design of Amplify \& Forward Full-Duplex (FD) relay-assisted communication systems. The FD mode has potential for significant improvements in spectral efficiency, but it suffers from large self-interference (SI) levels.

Beamforming-based SI mitigation is attractive for millimeter wave (mmWave) systems due to the large number of degrees of freedom available with large antenna arrays. We first develop an all-digital beamformer design by imposing a zero-forcing constraint on SI, performing quasi-optimally in terms of spectral efficiency. The design is then modified to fit the hardware-related constraints usually found when operating at mmWave, so that the beamformers can be implemented in the analog domain by using phase shifters, with an acceptable performance loss.

}, keywords = {full-duplex, mmWave, winter}, author = {R. L{\'o}pez-Valcarce and Nuria Gonz{\'a}lez-Prelcic} } @article {1043, title = {Capacity scaling in a non-coherent wideband massive SIMO block fading channel}, journal = {IEEE Transactions on Wireless Communications}, volume = {18}, year = {2019}, pages = {5691{\textendash}5704}, doi = {10.1109/TWC.2019.2938519}, author = {Gomez-Cuba, Felipe and Chowdhury, Mainak and Manolakos, Alexandros and Erkip, Elza and Goldsmith, Andrea J} } @conference {964, title = {Deep Learning Assisted Rate Adaptation in Spatial Modulation Links}, booktitle = {16th International Symposium on Wireless Communication Systems (ISWCS)}, year = {2019}, address = {Oulu (Finland)}, abstract = {

The adaptation of Spatial Modulation based links to the channel conditions is challenged by the complicated dependence between performance (either error rate metrics or theoretically achievable rates) and the multiple antenna channel description. In this paper a coding rate selection mechanism is presented based on a carefully selected set of channel features and the proper training of a deep neural network, which all together can satisfy a given error rate bound.

}, keywords = {Deep Learning, link adaptation, Machine Learning, Spatial Modulation}, author = {Anxo Tato and Carlos Mosquera} } @conference {971, title = {Dynamic Attribute-Based Privacy-Preserving Genomic Susceptibility Testing}, booktitle = {34th Annual ACM Symposium on Applied Computing, SAC 2019}, year = {2019}, month = {04/2019}, address = {Limassol, Cyprus}, author = {Mina Namazi and Cihan Eryonucu and Erman Ayday and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {973, title = {Efficient PRNU Matching in the Encrypted Domain}, booktitle = {XoveTIC}, year = {2019}, publisher = {MDPI}, organization = {MDPI}, address = {A Coru{\~n}a, Spain}, keywords = {camera attribution forensic analyzer, digital media forensics, lattice-based cryptosystems, Photoresponse Non-Uniformity}, author = {Alberto Pedrouzo-Ulloa and Miguel Masciopinto and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @inbook {956, title = {Expectation{\textendash}maximisation based distributed estimation in sensor networks}, booktitle = {Data Fusion in Wireless Sensor Networks: A statistical signal processing perspective}, year = {2019}, pages = {201-230}, publisher = {The Institution of Engineering and Technology (IET)}, organization = {The Institution of Engineering and Technology (IET)}, chapter = {9}, address = {London, UK}, abstract = {

Estimating the unknown parameters of a statistical model based on the observations collected by a sensor network is an important problem with application in multiple fields. In this setting, distributed processing, by which computations are carried out within the network in order to avoid raw data transmission to a fusion centre, is a desirable feature resulting in improved robustness and energy savings. In the presence of incomplete data, the expectation-maximisation (EM) algorithm is a popular means to iteratively compute the maximum likelihood (ML) estimate. It has found application in diverse fields such as computational biology, anomaly detection, speech segmentation, reinforcement learning, and motion estimation, among others. In this chapter we will review the formulation of the centralised EM estimation algorithm as a starting point and then discuss distributed versions well suited for implementation in sensor networks. The first class of these distributed versions requires specialised routing through the network in terms of a linear or circular path visiting all nodes, whereas the second class does away with this requirement by using the concept of network consensus to diffuse information through the network. Our focus will be on a relevant sensor network application, in which the parameter of a linear model is to be estimated in the presence of an unknown number of randomly malfunctioning sensors.

}, keywords = {winter, wsn}, isbn = {978-1-78561-584-9}, author = {R. L{\'o}pez-Valcarce and Alba Pag{\`e}s-Zamora} } @conference {969, title = {Flexible spectral precoding for OFDM systems}, booktitle = {2nd XoveTIC Conference}, year = {2019}, month = {09/2019}, address = {A Coru{\~n}a (Spain)}, abstract = {
Spectral precoding is a popular approach to reduce out-of-band radiation (OBR) in
multicarrier systems in order to avoid adjacent channel interference. However, it introduces
distortion in the data, appropriate decoding is required at the receiver side. Thus, trading off
between implementation complexity, OBR reduction and error rate is important. We present a novel
linear precoder design with flexibility to trade off OBR reduction, precoding/decoding complexity,
and error rate at the receiver. Moreover, the constraint can be imposed on each subcarrier individually
to provide more flexibility. The precoding matrices have low rank, which translates into significant
computational savings. In this way, the requirements of different systems can be satisfied with
varying complexity levels
}, keywords = {spectrum shaping, winter}, doi = {10.3390/proceedings2019021024}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @conference {958, title = {Flexible spectral precoding for sidelobe suppression in OFDM systems}, booktitle = {IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)}, year = {2019}, month = {04/2019}, pages = {4789 - 4793}, publisher = {IEEE}, organization = {IEEE}, address = {Brighton, UK}, abstract = {

Spectral precoding is a popular approach to reduce out-of-band radiation (OBR) in multicarrier systems in order to avoid adjacent channel interference. Since precoding will introduce signal distortion, appropriate decoding is required at the receiver side. We present a novel linear precoder design with flexibility to trade off OBR reduction, precoding/decoding complexity, and error rate at the receiver. The precoding matrices have low rank, which translates into significant computational savings. In this way, the requirements of different systems can be satisfied with varying complexity levels.

}, keywords = {spectrum shaping, winter}, doi = {10.1109/ICASSP.2019.8683162}, author = {Khawar Hussain and Ana Lojo and R. L{\'o}pez-Valcarce} } @conference {957, title = {Frequency-selective hybrid precoding and combining for mmWave MIMO systems with per-antenna power constraints}, booktitle = {IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)}, year = {2019}, month = {04/2019}, pages = {4794-4798}, publisher = {IEEE}, organization = {IEEE}, address = {Brighton, UK}, abstract = {

Configuring hybrid precoders and combiners is the main challenge to be solved to operate at millimeter wave (mmWave) frequencies. The use of hybrid architectures imposse hardware constraints on the analog precoder that need to be carefully dealt with. In this paper, we develop hybrid precoders and combiners aiming at minimizing the Euclidean distance with respect to the approximate all-digital precoders and combiners maximizing the spectral efficiency under per-antenna power constraints. Numerical results demonstrate the effectiveness of the proposed design method, whose performance is close to that of the all-digital solution.

}, keywords = {mmWave, winter}, doi = {10.1109/ICASSP.2019.8683831}, author = {Javier Rodr{\'\i}guez-Fern{\'a}ndez and R. L{\'o}pez-Valcarce and Nuria Gonz{\'a}lez-Prelcic} } @mastersthesis {983, title = {Homomorphic Lattice Cryptosystems for Secure Signal Processing}, year = {2019}, school = {University of Vigo}, address = {Vigo}, author = {Alberto Pedrouzo-Ulloa} } @article {970, title = {Improving PRNU Compression Through Preprocessing, Quantization, and Coding}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {14}, year = {2019}, month = {03/2019}, pages = {13}, chapter = {608}, author = {L. Bondi and P. Bestagini and Fernando P{\'e}rez-Gonz{\'a}lez and S. Tubaro} } @mastersthesis {979, title = {Link Adaptation Techniques for Future Terrestrial and Satellite Communications}, year = {2019}, month = {2019}, pages = {1-247}, abstract = {

The increasing demand of access to data from the users and the enormous number of connected devices requires to enhance the capacity of the wireless networks. They must provide a higher throughput to serve all the requested traffic and they must accommodate the vast number of the Internet of the Things (IoT) devices. In this context, this thesis focus its attention on three different scenarios which have in common that they are a future evolution of current terrestrial and satellite communications systems. These scenarios are Mobile Satellite Systems (MSS), Fixed Satellite Systems (FSS) and next generation 5G networks.

The adoption of Dual Polarization (DP) in MSS along with Multiple Input Multiple Output (MIMO) signal processing techniques allows to double the capacity of previous systems with the same bandwidth and transmit power. On the other hand, the shift to more aggressive frequency reuse patterns in FSS can also provide remarkable gains in the capacity of High Throughput Satellites (HTS) for offering BroadBand Satellite Services (BBS). Linear precoding stands out as a technique to cope with the high level of interference which arises in this scenario. Lastly, energy efficient modulation schemes, like Spatial Modulation (SM) and its many variants, are being proposed for increasing the capacity of future 5G networks since they represent a good trade-off between spectral efficiency, energy efficiency and transmitter complexity.\ \  \ 

Adaptive Coding and Modulation (ACM) technology is omnipresent in most of the communication standards since it enables a better exploitation of the system capacity by means of the adaptation of the Modulation and Coding Scheme (MCS). The link adaptation algorithm is responsible for selecting the optimum MCS, as well as other physical layer parameters in some cases, to adapt the transmission bit rate according to the instantaneous channel capacity of the time variant channel. Thus, link adaptation algorithms permit to increase the spectrum efficiency and guarantee a robust communication, adapting the level of redundancy of the coded information bits and the ruggedness of the modulation scheme.

In this thesis, several link adaptation algorithms are proposed for the three considered scenarios and its effectiveness is supported with simulations. Furthermore, an experimental validation of some algorithms is provided using a real satellite link, implemented with Software Defined Radio (SDR) technology. It is also studied how the carrier detection errors in the Channel State Information (CSI) affect linear precoding in FSS. The errors in the users Signal to Interference and Noise Ratio (SINR) that the gateway calculates to allocate MCS to the users is analyzed statistically and geographically. Moreover, a link adaptation algorithm with an adaptive margin per user is shown to allow a robust communication in the presence of SINR errors whereas the throughput of the system is barely compromised. In addition, a new method for making capacity calculations in SM and Generalized SM systems based on a neural network is proposed, which improves both accuracy and computational complexity with regard to the existing analytical approximations in the literature. With regard to MSS using DP, an adaptation mechanism is proposed in order to select the optimum MIMO mode and MCS which offer the highest throughput. Simulation results in a maritime mobile satellite channel show the dependence of the optimum MIMO mode with the average Signal to Noise Ratio (SNR), and how the spectral efficiency can be maximized whereas a target outage probability can be guaranteed. Lastly, the adaptation in SM systems is also addressed and several methods for deciding the coding rate in SM are given. These include the computation of the capacity prior to\  the adaptation, and also the use of a deep neural network. The latter offers very good results, with a spectral efficiency very close to the maximum achievable value.

}, author = {Anxo Tato} } @conference {960, title = {Low-rank data matrix recovery with missing values and faulty sensors}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2019}, month = {09/2019}, address = {A Coru{\~n}a, Spain}, abstract = {

In practice, data gathered by wireless sensor networks often belongs in a low-dimensional subspace, but it can present missing as well as corrupted values due to sensor malfunctioning and/or malicious attacks. We study the problem of Maximum Likelihood estimation of the low-rank factors of the underlying structure in such situation, and develop an Expectation-Maximization algorithm to this purpose, together with an effective initialization scheme. The proposed method outperforms previous schemes based on an initial faulty sensor identification stage, and is competitive in terms of complexity and performance with convex optimization-based matrix completion approaches.

}, keywords = {winter, wsn}, author = {R. L{\'o}pez-Valcarce and Josep Sala} } @article {948, title = {Maximally stationary window design for overlap-add based random vibration synthesis}, journal = {Mechanical Systems and Signal Processing}, volume = {122}, year = {2019}, month = {05/2019}, pages = {642-657}, abstract = {
The accurate synthesis of realistic waveforms conforming to certain speci ca-
tions is a fundamental step in random vibration testing. Since real-time imple-
mentation of digital signal processing systems for random vibration and noise
synthesis necessarily operates frame by frame, the overlap-add (OLA) method,
by which frames are windowed and overlapped, is widely used in practice to
avoid artifacts at frame boundaries. When a wide-sense stationary random
signal is desired, however, the OLA method presents a shortcoming, because
the inherent periodicity of the frame-by-frame process unavoidably produces a
cyclostationary signal, i.e., its statistics present an undesired periodic behav-
ior. We analyze the impact of the window coecients in the cyclostationarity
properties of the synthetic process, and then present algorithms for window de-
sign with the goal of maximizing a measure of its stationarity, considering both
second- and fourth-order statistical properties. The proposed designs are shown
to signi cantly improve the stationarity properties when compared to commonly
used windows.
}, keywords = {random vibration}, doi = {10.1016/j.ymssp.2018.12.038}, author = {Dami{\'a}n Gonz{\'a}lez and R. L{\'o}pez-Valcarce} } @article {947, title = {MMSE filter design for Full-Duplex filter-and-forward MIMO relays under limited dynamic range}, journal = {Signal Processing}, volume = {156}, year = {2019}, month = {03/2019}, pages = {208-219}, abstract = {
We study the problem of optimizing the end-to-end performance of a full-duplex filter-and-forward MIMO relay link, consisting
of a source, a relay, and a destination node, by employing linear filtering at each node. The system model accounts for multipath
propagation and self-interference at the relay, as well as transmitter impairments and limited dynamic range at every node. The
design accommodates signals with arbitrary spectra and includes the direct link between the source and destination nodes. Under
the minimum mean square error criterion, the resulting non-convex problem is approximated by a sequence of convex problems
and solved by means of an alternating minimization method. Linear constraints allocate some of the degrees of freedom in the relay
to guarantee a sufficiently small residual self-interference. Simulations quantify the impact of degrees of freedom, the dynamic
range, and the balance between direct and relay paths on the link performance.
}, keywords = {adaptive signal processing, full-duplex, winter}, doi = {doi.org/10.1016/j.sigpro.2018.11.001}, author = {Emilio Antonio-Rodr{\'\i}guez and Stefan Werner and R. L{\'o}pez-Valcarce and Risto Wichman} } @conference {965, title = {Neural Network Aided Computation of Generalized Spatial Modulation Capacity}, booktitle = {27th European Signal Processing Conference (EUSIPCO)}, year = {2019}, address = {A Coru{\~n}a (Spain)}, abstract = {

Generalized Spatial Modulation (GSM) is being considered for future high-capacity and energy efficient terrestrial networks. A variant such as Polarized Modulation (PMod) has also a role in Dual Polarization Mobile Satellite Systems. The implementation of adaptive GSM systems requires fast methods to evaluate the channel dependent GSM capacity, which amounts to solve multi-dimensional integrals without closed-form solutions. For this purpose, we propose the use of a Multilayer Feedforward Neural Network and an associated feature selection algorithm. The resulting method is highly accurate and with much lower complexity than alternative numerical methods.

}, keywords = {Generalized Spatial Modulation, Index Modulations, Machine Learning, Multilayer Feedforward Neural Network, Polarized Modulation}, author = {Anxo Tato and Carlos Mosquera and Pol Henarejos and Ana P{\'e}rez-Neira} } @conference {959, title = {OFDM spectral precoding with per-subcarrier distortion constraints}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2019}, month = {09/2019}, address = {A Coru{\~n}a, Spain}, abstract = {
Spectral precoding is effective in reducing out-of-band radiation
(OBR) in multicarrier systems, but it introduces distortion
in the data, requiring a suitable decoder at the receiver.
Thus, trading off OBR reduction, implementation complexity,
and error rate is of paramount importance. We present a precoder
design which minimizes OBR under constraints on the
distortion at each individual data subcarrier. By judiciously
choosing the distortion profile, the decoding task can be significantly
alleviated, with a sizable improvement in terms of
implementation complexity with respect to previous designs.
}, keywords = {spectrum shaping, winter}, author = {Khawar Hussain and R. L{\'o}pez-Valcarce} } @article {952, title = {Partial-Duplex Amplify-and-Forward Relaying: Spectral Efficiency Analysis under Self-Interference}, journal = {IEEE Transactions on Wireless Communications}, volume = {18}, year = {2019}, month = {04/2019}, pages = { 2271-2285}, abstract = {
We propose a novel mode of operation for Amplify-and-
Forward relays in which the spectra of the relay input and
output signals partially overlap. This partial-duplex relaying mode
encompasses half- and full-duplex as particular cases. By viewing
the partial-duplex relay as a bandwidth-preserving Linear
Periodically Time-Varying system, a spectral efficiency analysis
under self-interference is developed. In contrast with previous
works, self-interference is regarded as a useful informationbearing
component rather than simply assimilated to noise. This
approach reveals that previous results regarding the impact of
self-interference on (full-duplex) relay performance are overly
pessimistic. Based on a frequency-domain interpretation of the
effect of self-interference, a number of suboptimal decoding
architectures at the destination node are also discussed. It is found
that the partial-duplex relaying mode may provide an attractive
tradeoff between spectral efficiency and receiver complexity.
}, keywords = {full-duplex, myrada, winter}, doi = {10.1109/TWC.2019.2902390}, author = {R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {967, title = {Prediction Residue Analysis in MPEG-2 Double Compressed Video Sequences}, booktitle = {EUSIPCO}, year = {2019}, month = {09/2019}, pages = {1109-1113}, address = {A Coru{\~n}a, Spain}, abstract = {

In video forensics, the study of the prediction residue across successive frames is key to verify the integrity of digital videos. Focusing on an MPEG-2 double compression scheme, we analyze how the variance of the prediction residue evolves during the second compression depending on the type of frame (either I or P) employed in the first encoding and exploring different compression strengths and deadzone widths for quantization. This analysis reveals that the width of the quantizer deadzones actually affects the performance of existing methods based on the Variation of Prediction Footprint (VPF) for double compression detection and Group Of Pictures (GOP) size estimation. The predicted behavior from the theoretical characterization of the prediction residue is confirmed through experimental results with real video sequences.

}, keywords = {double compression detection, GOP size estimation, MPEG-2, prediction residue analysis, video forensics}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {974, title = {Rethinking Location Privacy for Unknown Mobility Behaviors}, booktitle = {IEEE European Symposium on Security and Privacy (EuroS\&P)}, year = {2019}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {972, title = {Revisiting Multivariate Lattices for Encrypted Signal Processing}, booktitle = {ACM Information Hiding and Multimedia Security Workshop (IH\&MMSec)}, year = {2019}, publisher = {ACM}, organization = {ACM}, address = {Paris, France}, keywords = {homomorphic encryption, Lattice-Based Cryptography, Multidimensional Signal Processing, Secure Signal Processing}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @proceedings {968, title = {Solving self-interference issues in a Full-Duplex radio transceiver}, journal = {2nd XoveTIC Conference}, year = {2019}, month = {09/2019}, address = {A Coru{\~n}a (Spain)}, abstract = {
Most wireless devices transmit and receive at different spectrum frequency bands. This
approach is no longer optimal due to increasing electromagnetic exhaustion. Besides, interference
among all present and future working services should be negligible. A full-duplex scheme using
the same band for simultaneous uplink and downlink is a huge step towards solving this issue.
However, sharing the same frequency band involves a large interference of transmitted signal over
received signal. To fix this problem, we propose the usage of a hybrid multistage cancellation system,
consisting of an analog cancellation setup at RF frequencies and a baseband digital cancellation stage.
}, keywords = {adaptive signal processing, full-duplex, winter}, doi = {10.3390/proceedings2019021035}, author = {Miguel Franco-Martinez and Francisco-Javier Martinez-Alonso and R. L{\'o}pez-Valcarce} } @conference {966, title = {Spatial Modulation for Beyond 5G Communications: Capacity Calculation and Link Adaptation}, booktitle = {2nd XoveTIC Conference}, year = {2019}, address = {A Coru{\~n}a (Spain)}, keywords = {5G, adaptive coding and modulation, Deep Learning, link adaptation, Machine Learning, neural networks, Spatial Modulation}, author = {Anxo Tato and Carlos Mosquera} } @conference {978, title = {Spatial Modulation Link Adaptation: a Deep Learning Approach}, booktitle = {2019 53rd Asilomar Conference on Signals, Systems, and Computers}, year = {2019}, address = {California}, author = {Anxo Tato and Carlos Mosquera} } @mastersthesis {982, title = {A Statistical Approach to the Design of Privacy-Preserving Services}, year = {2019}, author = {Simon Oya} } @article {955, title = {Technical Report: MPEG-2 Prediction Residue Analysis}, year = {2019}, institution = {University of Vigo}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {942, title = {Adjacent Beams Resource Sharing to Serve Hot Spots : A Rate Splitting Approach}, booktitle = {36th International Communications Satellite Systems Conference (ICSSC)}, year = {2018}, month = {10/2018}, address = {Niagara Falls, Canada}, abstract = {
This work addresses the uneven traffic demand scenario in multi-beam satellite systems, in which a hot-spot beam
is surrounded by cold beams. After partitioning the hotspot beam in different sectors, resource pulling from cold
neighbouring beams is allowed following an aggressive frequency-reuse scheme. As a consequence, the level of
the co-channel interference within the hot-spot beam increases. A scheme known as Non-Coherent Rate-Splitting (NCRS)
is employed to cope with this interference, based on the exclusive use of magnitude channel state information at the transmitter (CSIT).
The receiver complexity is increased with respect to full CSIT precoding schemes, which are considered for benchmarking purposes. Different NCRS strategies are analyzed and compared with several partial and full CSIT schemes. The proposed solution not only shows an improvement with respect to partial CSIT benchmarks, but also displays a competitive performance against full CSIT precoders.
}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and M{\`a}rius Caus and Adriano Pastore and Nader Alagha and Nele Noels} } @conference {951, title = {Camera Attribution Forensic Analyzer in the Encrypted Domain}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2018}, publisher = {IEEE}, organization = {IEEE}, address = {Hong Kong}, author = {Alberto Pedrouzo-Ulloa and Miguel Masciopinto and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {1040, title = {Capacity Scaling of Cellular Networks: Impact of Bandwidth, Infrastructure Density and Number of Antennas}, journal = {IEEE Transactions on Wireless Communications}, volume = {17}, year = {2018}, pages = {652{\textendash}666}, keywords = {Ad hoc networks, Analytical models, antenna arrays, Bandwidth, bandwidth scaling limit, capacity scaling laws, Cellular networks, cellular radio, cooperative communication, millimeter wave bands, millimetre wave antenna arrays, millimetre wave communication, multihop protocol, next generation networks, next-generation cellular networks, protocols, radio spectrum management, relay networks (telecommunication), Wideband regime, Wireless communication}, author = {Gomez-Cuba, F and Erkip, E and Rangan, S and Gonzalez-Castano, F J} } @conference {923, title = {Channel dependent Mutual Information in Index Modulations}, booktitle = {ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing}, year = {2018}, abstract = {

Mutual Information is the metric that is used to perform link adaptation, which allows to achieve rates near capacity. The computation of adaptive transmission modes is achieved by employing the mapping between the Signal to Noise Ratio and the Mutual Information. Due to the high complexity of the computation of the Mutual Information, this process is performed off-line via Monte Carlo simulations, whose results are stored in look-up tables. However, in Index Modulations, such as Spatial Modulation or Polarized Modulation, this is not feasible since the constellation and the Mutual Information are channel dependent and it would require to compute this metric at each time instant if the channel is time varying. In this paper, we propose different approximations in order to obtain a simple closed-form expression that allows to compute the Mutual Information at each time instant and thus, making feasible the link adaptation.

}, author = {Pol Henarejos and Ana P{\'e}rez-Neira and Anxo Tato and Carlos Mosquera} } @article {935, title = {Distributed Precoding Systems in Multi-Gateway Multibeam Satellites: Regularization and Coarse Beamforming}, journal = {IEEE Transactions on Wireless Communication}, year = {2018}, author = {Carlos Mosquera and R. L{\'o}pez-Valcarce and Tom{\'a}s Ram{\'\i}rez and Vahid Joroughi} } @conference {936, title = {Exploratory Analysis of Superposition Coding and Rate Splitting for Multibeam Satellite Systems}, booktitle = {15th International Symposium on Wireless Communication Systems (ISWCS)}, year = {2018}, address = { Lisbon, Portugal}, author = {M{\`a}rius Caus and Adriano Pastore and M{\`o}nica Navarro and Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Nele Noels and Nader Alagha and Ana I. Perez-Neira} } @conference {944, title = {Link Adaptation and Carriers Detection Errors in Multibeam Satellite Systems with Linear Precoding}, booktitle = {9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC)}, year = {2018}, address = {Berlin, Germany}, abstract = {

The application of linear precoding at the gateway side enables broadband multibeam satellite systems to use more aggressive frequency reuse patterns increasing the overall capacity of future High Throughput Satellites (HTS). However, although some previous works about precoding consider imperfect CSIT (Chanel State Information at the Transmitter) adding some CSI estimation errors, that is not the main cause of CSI degradation. In practice, receivers can only detect and estimate a few coefficients of the CSI vector being the other nullified, replaced by zeros. This introduces errors in the SINR calculation by the gateway that lead to the assignment of Modulation and Coding Schemes (MCS) over the decoding possibilities of the users, increasing the rate of erroneous frames. In this work, the errors in the SINR calculation caused by the nullification of the CSI are analyzing statistically and geographically using a radiation diagram of 245 beams over Europe. Furthermore, a solution based on a link adaptation algorithm with a per user adaptive margin is proposed, helping to achieve the QEF (Quasi-error Free) target of DVB-S2X systems.

}, author = {Anxo Tato and Stefano Andrenacci and Chatzinotas, S. and Carlos Mosquera} } @conference {921, title = {Locally optimal invariant detector for testing equality of two power spectral densities}, booktitle = { IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2018}, address = {Calgary, Canada}, abstract = {
This work addresses the problem of determining whether two multivariate random time series have the same power spectral density
(PSD), which has applications, for instance, in physical-layer security and cognitive radio. Remarkably, existing detectors for this
problem do not usually provide any kind of optimality. Thus, we study here the existence under the Gaussian assumption of optimal
invariant detectors for this problem, proving that the uniformly most powerful invariant test (UMPIT) does not exist. Thus, focusing on
close hypotheses, we show that the locally most powerful invariant test (LMPIT) only exists for univariate time series. In the multivariate
case, we prove that the LMPIT does not exist. However, this proof suggests two LMPIT-inspired detectors, one of which outperforms
previously proposed approaches, as computer simulations show.
}, keywords = {cognitive radio, winter}, author = {David Ram{\'\i}rez and Daniel Romero and Javier V{\'\i}a and R. L{\'o}pez-Valcarce and Ignacio Santamar{\'\i}a} } @conference {937, title = {Message-Splitting for Interference Cancellation in Multibeam Satellite Systems}, booktitle = {9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC)}, year = {2018}, address = { Berlin, Germany}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and M{\`a}rius Caus and Adriano Pastore and M{\`o}nica Navarro and Nele Noels} } @article {913, title = {Parameter estimation in wireless sensor networks with faulty transducers: A distributed EM approach}, journal = {Signal Processing}, volume = {144}, year = {2018}, month = {03/2018}, pages = {226-237}, abstract = {

We address the problem of distributed estimation of a vector-valued parameter performed by a wireless sensor network in the presence of noisy observations which may be unreliable due to faulty transducers. The proposed distributed estimator is based on the Expectation-Maximization (EM) algorithm and combines consensus and diffusion techniques: a term for information diffusion is gradually turned off, while a term for updated information averaging is turned on so that all nodes in the network approach the same value of the estimate. The proposed method requires only local exchanges of information among network nodes and, in contrast with previous approaches, it does not assume knowledge of the a priori probability of transducer failures or the noise variance. A convergence analysis is provided, showing that the convergent points of the centralized EM iteration are locally asymptotically convergent points of the proposed distributed scheme. Numerical examples show that the distributed algorithm asymptotically attains the performance of the centralized EM method.

}, keywords = {winter, wsn}, doi = {10.1016/j.sigpro.2017.10.012}, url = {https://authors.elsevier.com/a/1W90XbZX4rsob}, author = {Silvana Silva Pereira and R. L{\'o}pez-Valcarce and Alba Pag{\`e}s-Zamora} } @conference {934, title = {Practical Implementation of Link Adaptation with Dual Polarized Modulation (Best paper award)}, booktitle = {11th International Symposium on Communication Systems, Networks, and Digital Signal Processing.}, year = {2018}, author = {Anxo Tato and Carlos Mosquera and Pol Henarejos and Ana P{\'e}rez-Neira} } @conference {940, title = {Putting the PRNU Model in Reverse Gear: Findings with Synthetic Signals}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2018}, month = {2018}, address = {Rome, Italy}, author = {Miguel Masciopinto and Fernando P{\'e}rez-Gonz{\'a}lez} } @proceedings {946, title = {Software Defined Radio: A Brief Introduction}, journal = {XoveTIC Congress}, year = {2018}, month = {09/2018}, publisher = {MDPI}, address = {A Coru{\~n}a, Spain}, abstract = {

In this short article the concept of Software Defined Radio (SDR) is introduced and compared with the traditional radio. Then, a research project of atlanTTic center which used this technology was briefly presented and lastly, we include a reference to some dissemination
activities related with SDR to be developed shortly.

}, doi = {https://doi.org/10.3390/proceedings2181196}, url = {https://www.mdpi.com/2504-3900/2/18/1196}, author = {Anxo Tato} } @conference {931, title = {Spectral and statistical evaluation of the properties of the vibration measured at the base of an automotive seat for non-Gaussian random noise synthesis}, booktitle = {Int. Conf. on Noise and Vibration Engineering, ISMA-USD 2018}, year = {2018}, month = {09/2018}, address = {Leuven, Belgium}, abstract = {
The first step in the definition of the specifications for the vibration tests of any automotive component
is the recording and evaluation of the properties of the input vibration during field measurements. In this
paper, we explore the properties of the vibration measured at the base of the driver seat when driving
through different surfaces, with the purpose of defining a model for non-Gaussian random vibration
testing. The recorded acceleration signals are first transformed to a 6 Degree of Freedom (DOF) space,
and then segmented into stationary sections that are later analyzed. The non-Gaussian nature of the
recorded vibration is demonstrated through different Gaussianity hypothesis tests, and the distribution of
the third and fourth order moments, as well as the crest factor, are computed and analyzed. The second-order\ 
spectral content reveals significant correlation at specific frequencies, while the significance of
third order polyspectra is checked through hypothesis testing. Based on our observations, a practical
definition of the random process is proposed based on second-order spectral content, univariate kurtosis
and crest factor levels.
}, keywords = {random vibration}, author = {Dami{\'a}n Gonz{\'a}lez and R. L{\'o}pez-Valcarce} } @conference {950, title = {Symbol-Asynchronous Transmission In Multibeam Satellite User Down-Link: Rate Regions For Novel Superposition Coding Schemes}, booktitle = {6th IEEE Global Conference on Signal and Information Processing}, year = {2018}, abstract = {

We consider the forward link of a multibeam satellite system with high spectral reuse and the novel low-complexity transmission and detection strategies from ["{\textquotedblleft}Exploratory analysis of superposition coding and rate splitting for multibeam satellite systems", ISWCS 2018]. More specifically, we study the impact of a time offset between the antenna beams that cooperate to simultaneously serve a given user. Assuming Gaussian signaling, we provide closed-form expressions for the achievable rate region. It is demonstrated that, in the absence of timing information at the gateway, this region is not affected by a time offset. Our numerical results further show that, in case timing is known at the gateway, an offset of half a symbol period at both user terminals is optimal in terms of spectral efficiency.

}, author = {Nele Noels and Marc Moeneclaey and Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and M{\`a}rius Caus and Adriano Pastore} } @article {941, title = {Testing equality of multiple power spectral density matrices}, journal = {IEEE Trans. Signal Processing}, volume = {66}, year = {2018}, month = {12/2018}, pages = {6268-6280}, keywords = {cognitive radio, winter}, doi = { 10.1109/TSP.2018.2875884}, author = {David Ram{\'\i}rez and Daniel Romero and Javier V{\'\i}a and R. L{\'o}pez-Valcarce and Ignacio Santamar{\'\i}a} } @conference {930, title = {Two-Level Precoding for High Throughput Satellites with non-Cooperative Gateways}, booktitle = {22nd International Workshop on Smart Antennas (WSA)}, year = {2018}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera and Roberto L{\'o}pez-Valcarce} } @conference {906, title = {Back to the Drawing Board: Revisiting the Design of Optimal Location Privacy-preserving Mechanisms}, booktitle = {ACM Conference on Computer and Communications Security (CCS)}, year = {2017}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {1036, title = {Bit allocation for increased power efficiency in 5G receivers with variable-resolution ADCs}, booktitle = {2017 Information Theory and Applications Workshop (ITA)}, year = {2017}, month = {feb}, pages = {1{\textendash}7}, keywords = {5G mobile communication, analogue-digital conversio}, author = {b. Abbas, W and Gomez-Cuba, F and Zorzi, M} } @article {871, title = {CDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation}, journal = {Digital Signal Processing}, volume = {62}, year = {2017}, month = {03/2017}, pages = {38-51}, abstract = {
This paper presents an acoustic local positioning system (ALPS) suitable for indoor positioning
of portable devices such as smartphones or tablets, based on the transmission of high frequency
CDMA-coded signals from a fixed network of beacons. The main novelty of the proposed ALPS is
its capability to mitigate the effects of multipath propagation by performing an accurate estimation
of the Line-of-Sight Time-of-Flights (LOS-TOF) through the Matching Pursuit algorithm. Signal
detection, multipath cancellation and positioning estimation all take place within the portable device,
which provides a graphical representation of the updated position in less than a second. The
performance of the Matching Pursuit algorithm is analyzed in a real scenario and the results show
that the proposed method is capable to retrieve the multipath-free System Availability under strong
multipath conditions with SNR levels as low as 0 dB.
}, keywords = {compass, wsn}, issn = {1051-2004}, doi = {10.1016/j.dsp.2016.11.001}, author = {Fernando J. Alvarez and Teodoro Aguilera and R. L{\'o}pez-Valcarce} } @conference {903, title = {Defending Surveillance Sensor Networks Against Data-Injection Attacks via Trusted Nodes}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2017}, month = {08/2017}, address = {Kos Island, Greece}, abstract = {
By injecting false data through compromised sensors, an adversary can drive the probability of detection in a sensor network-based spatial field surveillance system to arbitrarily low values. As a countermeasure, a small subset of sensors may be secured. Leveraging the theory of Matched Subspace Detection, we propose and evaluate several detectors that add robustness to attacks when such trusted nodes are available. Our results reveal the performance-security tradeoff of these schemes and can be used to determine the number of trusted nodes required for a given performance target.
}, keywords = {winter, wsn}, author = {R. L{\'o}pez-Valcarce and Daniel Romero} } @conference {932, title = {Design of projection matrices for PRNU compression}, booktitle = {2017 IEEE Workshop on Information Forensics and Security (WIFS)}, year = {2017}, month = {Dec}, pages = {1-6}, keywords = {acquisition time, cameras, computational complexity, data compression, defacto standard, design methodology, digital photo, forensics investigators, image coding, Image forensics, image sensors, image source identification, interpolation, matrix algebra, nearly-flat spectral characteristics, Performance evaluation, photo response nonuniformity, PRNU compression, probability, projection matrices, public image dataset, Signal to noise ratio, silicon sensor imperfections, specific camera sensor, weak multiplicative noise}, doi = {10.1109/WIFS.2017.8267652}, author = {L. Bondi and Fernando P{\'e}rez-Gonz{\'a}lez and P. Bestagini and S. Tubaro} } @conference {912, title = {Distributed Precoding Systems in Multi-Gateway Multibeam Satellites}, booktitle = {35th AIAA International Communications Satellite Systems Conference}, year = {2017}, month = {10/2017}, address = {Trieste,Italy}, keywords = {precoding, satcom}, author = {Carlos Mosquera and R. L{\'o}pez-Valcarce and Tom{\'a}s Ram{\'\i}rez} } @article {880, title = {FER Estimation in a Memoryless BSC with Variable Frame Length and Unreliable ACK/NAK Feedback}, journal = {IEEE Transactions on Wireless Communications}, volume = {16}, year = {2017}, month = {06/2017}, pages = {3661 - 3673}, abstract = {
We consider the problem of estimating the frame error rate (FER) of a given memoryless binary symmetric channel by observing the success or failure of transmitted packets. Whereas FER estimation is relatively straightforward if all observations correspond to packets with equal length, the problem becomes considerably more complex when this is not the case. We develop FER estimators when
transmissions of different lengths are observed, together with the Cramer-Rao Lower Bound (CRLB). Although the main focus is on Maximum Likelihood (ML) estimation, we also obtain low complexity schemes performing close to optimal in some scenarios. In a second stage, we consider the case in which FER estimation is performed at a node different from the receiver, and incorporate the impairment of unreliable observations by considering noisy ACK/NAK feedback links. The impact of unreliable feedback is analyzed by means of the corresponding CRLB. In this setting, the ML estimator is obtained by applying the Expectation-Maximization algorithm to jointly estimate the error probabilities of the data and feedback links. Simulation results illustrate the benefits of the proposed estimators.
}, keywords = {adaptive signal processing, compass, Cram{\'e}r-Rao bound (CRB), frame error rate, myrada, winter}, doi = {10.1109/TWC.2017.2686845}, author = {Alberto Rico-Alvari{\~n}o and R. L{\'o}pez-Valcarce and Carlos Mosquera and Robert W. Heath Jr.} } @conference {877, title = {Filter design for delay-based anonymous communications}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2017}, keywords = {adversarial signal processing, compass, Multimedia security, winter}, author = {Simon Oya and Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @conference {908, title = {Is Geo-Indistinguishability what you are looking for?}, booktitle = {Workshop on Privacy in the Electronic Society (WPES)}, year = {2017}, keywords = {adversarial signal processing, Multimedia security, winter}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {878, title = {Learning Power Spectrum Maps from Quantized Power Measurements}, journal = {IEEE Transactions on Signal Processing}, volume = {65}, year = {2017}, month = {05/2017}, pages = {2547-2560}, abstract = {
Using power measurements collected by a network of low-cost sensors, power spectral density (PSD) maps are con-
structed to capture the distribution of RF power across space and frequency. Linearly compressed and quantized power measure-
ments enable wideband sensing at affordable implementation complexity using a small number of bits. Strengths of data- and model-
driven approaches are combined to develop estimators capable of incorporating multiple forms of spectral and propagation prior
information while fitting the rapid variations of shadow fading across space. To this end, novel nonparametric and semiparametric
formulations are investigated. It is shown that the desired PSD maps can be obtained using support vector machine-type solvers.
In addition to batch approaches, an online algorithm attuned to real-time operation is developed. Numerical tests assess the performance of the novel algorithms.\ 
}, keywords = {cognitive radio, compass, compressed sensing, spectrum sensing, winter, wsn}, doi = {10.1109/TSP.2017.2666775}, author = {Daniel Romero and Seung-Jun Kim and Georgios Giannakis and R. L{\'o}pez-Valcarce} } @proceedings {909, title = {Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems}, journal = {9th EAI International Conference on Wireless and Satellite Systems, WISATS}, volume = {Wireless and Satellite Systems}, year = {2017}, month = {2018}, pages = {52-61}, publisher = {Springer International Publishing}, address = {Oxford}, abstract = {

The use of dual polarization in mobile satellite systems is
very promising as a means for increasing the transmission capacity. In this paper a system which uses simultaneously two orthogonal polarizations in order to communicate with the users is studied. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable throughput gains up to 100 \% when compared with the single polarization system. The gateway is allowed to vary the MIMO and Modulation\  and Coding Schemes for each frame. The selection is done by means of a link adaptation algorithm which uses a tunable margin to achieve a predefined target Frame Error Rate.

}, issn = {978-3-319-76571-6}, author = {Anxo Tato and Pol Henarejos and Carlos Mosquera and Ana P{\'e}rez-Neira} } @conference {1042, title = {Millimeter Wave Receiver Comparison Under Energy vs Spectral Efficiency Trade-off}, booktitle = {European Wireless 2017; 23th European Wireless Conference}, year = {2017}, pages = {1{\textendash}7}, author = {Abbas, W B and Gomez-Cuba, F and Zorzi, M} } @article {882, title = {Number Theoretic Transforms for Secure Signal Processing}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {12}, year = {2017}, month = {05/2017}, pages = {1125-1140}, chapter = {1125}, keywords = {lattice cryptography, Multimedia security, Number Theoretic Transforms, Secure Signal Processing, Signal Processing in the Encrypted Domain, Somewhat Homomorphic Encryption, winter}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {902, title = {A Random Matrix Approach to the Forensic Analysis of Upscaled Images}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {12}, year = {2017}, month = {09/2017}, pages = {2115-2130}, chapter = {2115}, keywords = {Multimedia security, winter}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a} } @conference {907, title = {Random Matrix Theory for Modeling the Eigenvalue Distribution of Images under Upscaling}, booktitle = {International Tyrrhenian Workshop on Digital Communication 2017}, year = {2017}, month = {09/2017}, pages = {109-124}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, address = {Palermo, Italy}, abstract = {

\ The stochastic representation of digital images through a two-dimensional autoregressive (2D-AR) model offers a proper way to approximate the empirical distribution of the eigenvalues coming from genuine images. By considering this model, we apply random matrix theory to analytically derive the asymptotic eigenvalue distribution of causal 2D-AR random fields that have undergone an upscaling operation with a particular interpolation kernel. This eigenvalue characterization is useful in developing new forensic techniques for image resampling detection since we can use theoretical bounds to drive the decision of detectors based on subspace decomposition. Moreover, experimental results with real images show that the obtained asymptotic limits turn out to be excellent approximations, even when working with images of small size.

}, keywords = {Multimedia security, winter}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a} } @conference {876, title = {Robust clustering of data collected via crowdsourcing}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2017}, month = {03/2017}, pages = {4014 - 4018}, address = {New Orleans}, abstract = {

Crowdsourcing approaches rely on the collection of multiple individuals to solve problems that require analysis of large data sets in a timely accurate manner. The inexperience of participants or annotators motivates well robust techniques. Focusing on clustering setups, the data provided by all annotators is suitably modeled here as a mixture of Gaussian components plus a uniformly distributed random variable to capture outliers. The proposed algorithm is based on the expectation-maximization algorithm and allows for soft assignments of data to clusters, to rate annotators according to their performance, and to estimate the number of Gaussian components in the non-Gaussian/Gaussian mixture model, in a jointly manner.

}, keywords = {winter, wsn}, doi = {10.1109/ICASSP.2017.7952910}, author = {Alba Pag{\`e}s-Zamora and Georgios Giannakis and R. L{\'o}pez-Valcarce and Pere Gimenez-Febrer} } @conference {883, title = {Secure Genomic Susceptibility Testing based on Lattice Encryption}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2017}, publisher = {IEEE}, organization = {IEEE}, address = {New Orleans, USA}, keywords = {adversarial signal processing, compass, Genomic Privacy, homomorphic encryption, Lattice-Based Cryptography, Privacy Protection}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Alberto Pedrouzo-Ulloa and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {895, title = {Smart Detection of Line-Search Oracle Attacks}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {12}, year = {2017}, month = {03/2017}, pages = {588-603}, chapter = {588}, author = {Tondi, Benedetta and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Barni, Mauro} } @article {905, title = {Statistical detection of JPEG traces in digital images in uncompressed formats}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {12}, year = {2017}, author = {Cecilia Pasquini and Giulia Boato and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {888, title = {Technical Report UV-TSC-DVP-19042017: Derivation of the Asymptotic Eigenvalue Distribution for Causal 2D-AR Models under Upscaling}, year = {2017}, institution = {University of Vigo}, issn = {UV-TSC-DVP-19042017}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a} } @conference {924, title = {Time-domain channel estimation for wideband millimeter wave systems with hybrid architecture}, booktitle = { IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2017}, month = {03/2017}, pages = {6193-6197}, abstract = {

Millimeter wave (mm Wave) systems will likely employ large antennas at both the transmitter and receiver for directional beamforming. Hybrid analog/digital MIMO architectures have been proposed previously for leveraging both array gain and multiplexing gain, while reducing the power consumption in analog-to-digital converters. Channel knowledge is needed to design the hybrid precoders/combiners, which is difficult to obtain due to the large antenna arrays and the frequency selective nature of the channel. In this paper, we propose a sparse recovery based time-domain channel estimation technique for hybrid architecture based frequency selective mmWave systems. The proposed compressed sensing channel estimation algorithm is shown to provide good estimation error performance, while requiring small training overhead. The simulation results show that using multiple RF chains at the receiver and the transmitter further reduces the training overhead.

}, keywords = {compass, mmWave, myrada}, author = {Kiran Venugopal and Ahmed Alkhateeb and Robert W. Heath Jr. and Nuria Gonz{\'a}lez-Prelcic} } @article {838, title = {Wideband full-duplex MIMO relays with blind adaptive self-interference cancellation}, journal = {Signal Processing}, volume = {130}, year = {2017}, month = {01/2017}, pages = {74-85}, chapter = {74}, abstract = {
We develop adaptive self-interference cancellation algorithms for both filter-and-forward and decode-and-forward
multiple-input multiple-output relays. The algorithms are blind in the sense that they only exploit the spectral properties
of the transmitted signal to identify the self-interference channel, while dealing with frequency-selective channels and
arbitrary signal spectra. Our approach is non-intrusive in the sense that the algorithms can successfully identify, track,
and cancel the self-interference distortion while the relay is operating in its normal mode. We study the stationary
points of the algorithms and analyze under which conditions they achieve perfect cancellation of the self-interference.
Simulation results show that the algorithms provide residual self-interference levels below the noise floor by using
the time samples of only a few OFDM symbols.
}, keywords = {adaptive signal processing, compass, full duplex, winter}, issn = {0165-1684}, doi = {10.1016/j.sigpro.2016.06.010}, author = {Emilio Antonio-Rodr{\'\i}guez and Stefan Werner and R. L{\'o}pez-Valcarce and Taneli Riihonen and Risto Wichman} } @conference {841, title = {Advanced Signal Processing Techniques for Fixed and Mobile Satellite Communications}, booktitle = {8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop}, year = {2016}, month = {09/2016}, keywords = {compass, full duplex, satcom}, author = {Pol Henarejos and Ana P{\'e}rez-Neira and Nicol{\`o} Mazzali and Carlos Mosquera} } @conference {857, title = {Array thinnig for antenna selection in millimeter wave MIMO systems}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2016}, month = {2016}, keywords = {compass, mmWave}, author = {C. Rusu and Nuria Gonz{\'a}lez-Prelcic and R. W. Heath Jr} } @conference {840, title = {Bandwidth Allocation in Partial Duplex Relaying}, booktitle = {The 17th IEEE International workshop on Signal Processing advances in Wireless Communications (SPAWC)}, year = {2016}, month = {07/2016}, address = {Edinburgh, UK}, keywords = {compass, full duplex, relay}, author = {Carlos Mosquera and R. L{\'o}pez-Valcarce} } @conference {886, title = {Co-creating Security-and-Privacy-by-Design Systems}, booktitle = {International Conference on Availability, Reliability and Security (ARES)}, year = {2016}, month = {09/2016}, pages = {768-775}, address = {Salzburg, Germany}, author = {Sauro Vicini and Francesco Alberti and Nicol{\'a}s Notario and Alberto Crespo and Juan Ram{\'o}n Troncoso-Pastoriza and Alberto Sanna} } @article {825, title = {Compressive Covariance Sensing: Structure-Based Compressive Sensing Beyond Sparsity}, journal = {IEEE Signal Processing Magazine}, volume = {33}, year = {2016}, month = {01/2016}, pages = {78--93}, abstract = {
Compressed sensing deals with the reconstruction of signals
from sub-Nyquist samples by exploiting the sparsity of their
projections onto known subspaces. In contrast, the present
article is concerned with the reconstruction of second-order
statistics, such as covariance and power spectrum, even in
the absence of sparsity priors. The framework described here
leverages the statistical structure of random processes to
enable signal compression and offers an alternative perspective
at sparsity-agnostic inference. Capitalizing on parsimonious
representations, we illustrate how compression and reconstruction
tasks can be addressed in popular applications such
as power spectrum estimation, incoherent imaging, direction
of arrival estimation, frequency estimation, and wideband
spectrum sensing.
}, keywords = {compass, compressed sensing}, author = {Daniel Romero and Dyonisius D Ariananda and Zhi Tian and Geert Leus} } @article {873, title = {Data Hiding Robust to Mobile Communication Vocoders}, journal = {IEEE Transactions on Multimedia}, volume = {18}, year = {2016}, month = {12/2016}, pages = {2345-2357}, doi = {10.1109/TMM.2016.2599149}, author = {Reza Kazemi and Fernando P{\'e}rez-Gonz{\'a}lez and Mohamed Ali Akhaee and Fereydoon Behnia} } @conference {846, title = {Design of data-injection adversarial attacks against spatial field detectors}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2016}, month = {06/2016}, address = {Palma de Mallorca, Spain}, abstract = {

Data-injection attacks on spatial field detection corrupt a subset of measurements to cause erroneous decisions. We consider a centralized decision scheme exploiting spatial field smoothness to overcome lack of knowledge on system parameters such as noise variance. We obtain closed-form expressions for system performance and investigate strategies for an intruder injecting false data in a fraction of the sensors in order to reduce the probability of detection. The problem of determining the most vulnerable subset of sensors is also analyzed.

}, keywords = {adversarial signal processing, compass, wsn}, author = {R. L{\'o}pez-Valcarce and Daniel Romero} } @article {837, title = {Design of pool mixes against profiling attacks in real conditions}, journal = {IEEE/ACM Transactions on Networking}, volume = {24}, year = {2016}, month = {12/2016}, pages = {3662-3675}, keywords = {adversarial signal processing, compass}, doi = {10.1109/TNET.2016.2547391}, author = {Simon Oya and Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @article {850, title = {Designing incoherent frames through convex techniques for optimized compressed sensing}, journal = {IEEE Transactions on Signal Processing}, volume = {64}, year = {2016}, month = {May/2016}, pages = {2334-2344}, chapter = {2334}, keywords = {compass, compressed sensing}, author = {Cristian Rusu and Nuria Gonz{\'a}lez-Prelcic} } @mastersthesis {830, title = {Detection of Image Resampling and Video Encoding Footprints for Forensic Applications}, year = {2016}, month = {01/2016}, school = {University of Vigo}, address = {Vigo}, author = {David V{\'a}zquez-Pad{\'\i}n} } @conference {845, title = {Distributed multivariate regression with unknown noise covariance in the presence of outliers: a minimum description length approach}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2016}, address = {Palma de Mallorca, Spain}, abstract = {
We consider the problem of estimating the coefficients in a multivariable linear model by means of a wireless sensor network
which may be affected by anomalous measurements. The noise covariance matrices at the different sensors are assumed
unknown. Treating outlying samples, and their support, as additional nuisance parameters, the Maximum Likelihood
estimate is investigated, with the number of outliers being estimated according to the Minimum Description Length
principle. A distributed implementation based on iterative consensus techniques is then proposed, and it is shown effective
for managing outliers in the data.
}, keywords = {compass, wsn}, author = {R. L{\'o}pez-Valcarce and Daniel Romero and Josep Sala and Alba Pag{\`e}s-Zamora} } @conference {864, title = {Dynamic Privacy-Preserving Genomic Susceptibility Testing}, booktitle = {ACM Workshop on Information Hiding and Multimedia Security}, year = {2016}, month = {06/2016}, pages = {45-50}, author = {Mina Namazi and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {860, title = {Estimating millimeter wave channels using out-of-band measurements}, booktitle = {Information Theory and Applications Workshop (ITA}, year = {2016}, month = {January, 2016}, keywords = {compass, mmWave}, author = {Anum Ali and Nuria Gonz{\'a}lez-Prelcic and R.W. Heath Jr.} } @article {855, title = {Fast orthonormal sparsifying transforms based on Householder reflectors}, journal = {IEEE Transactions on Signal Processing}, volume = {64}, year = {2016}, month = {12/2016}, pages = {6589-6599}, keywords = {compass, compressed sensing}, doi = {10.1109/TSP.2016.2612168}, author = {C. Rusu and Nuria Gonz{\'a}lez-Prelcic and R.W. Heath Jr.} } @conference {875, title = {Fast Sequential Forensic Detection of Camera Fingerprint}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2016}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Miguel Masciopinto and Iria Gonz{\'a}lez-Iglesias and Pedro Comesa{\~n}a} } @mastersthesis {831, title = {Flat Fading Channel Estimation Based on Dirty Paper Coding}, year = {2016}, school = {University of Vigo}, address = {Vigo}, author = {Gabriel Dom{\'\i}nguez-Conde} } @conference {874, title = {Forensics of high quality and nearly identical JPEG image recompression}, booktitle = {ACM Workshop on Information Hiding and Multimedia Security}, year = {2016}, author = {Cecilia Pasquini and Pascal Schoettle and Rainer Bohme and Giulia Boato and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {925, title = {Frequency selective multiuser hybrid precoding for mmWave systems with imperfect channel knowledge}, booktitle = {Asilomar Conf. on Signals, Systems and Computers}, year = {2016}, month = {11/2016}, keywords = {compass, mmWave}, doi = {10.1109/ACSSC.2016.7869044}, author = {Jose P. Gonzalez-Coma and Nuria Gonz{\'a}lez-Prelcic and Luis Castedo and Robert W. Heath Jr.} } @conference {843, title = {Full-duplex operation in two-way broadcast service for maritime applications}, booktitle = {8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop}, year = {2016}, month = {09/2016}, keywords = {compass, full duplex, satcom}, author = {Tom{\'a}s Ram{\'\i}rez and Carlos Mosquera} } @article {854, title = {Hybrid MIMO Architectures for Millimeter Wave Communications: Phase Shifters or Switches?}, journal = {IEEE Access}, volume = {4}, year = {2016}, month = {January, 2016}, pages = {247-267}, doi = {10.1109/ACCESS.2015.2514261}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=7370753}, author = {Mendez-Rial, Roi and Rusu, Cristian and Nuria Gonz{\'a}lez-Prelcic and Alkhateeb, A. and Heath Jr, Robert W.} } @conference {870, title = {Hybrid precoders and combiners for mmWave MIMO systems with per-antenna power constraints}, booktitle = { IEEE Global Telecommunications Conf. (GLOBECOM)}, year = {2016}, abstract = {
This paper considers the design of hybrid precoders
and combiners for mmWave MIMO systems with per-antenna
power constraints and the additional limitations introduced by
the phase-shifting network in the analog processing stage. Previous
hybrid designs were obtained using a total power constraint,
but in practical implementations per-antenna constraints are
more realistic, specially at mmWave, given the large number of
power amplifiers used in the transmit array. Assuming perfect
channel knowledge, we obtain first an approximation to the alldigital
solution for the precoder and the combiner given the
per-antenna constraints. Then, we develop a new method for the
design of the hybrid precoder and combiner which attempts to
match such all-digital approximation. Simulation results show
the effectiveness of the proposed approach, which performs close
to the all-digital solution.
}, keywords = {compass, mmWave}, author = {R. L{\'o}pez-Valcarce and Nuria Gonz{\'a}lez-Prelcic and Cristian Rusu and R. W. Heath, Jr} } @conference {881, title = {Image denoising in the encrypted domain}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2016}, month = {12/2016}, publisher = {IEEE}, organization = {IEEE}, address = {Abu Dhabi, UAE}, keywords = {compass, homomorphic processing, Image Denoising, Image Encryption, lattice cryptography}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {842, title = {The impact of feeder link interference in multiple gateway multibeam satellite systems}, booktitle = {8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop}, year = {2016}, month = {09/2016}, keywords = {compass, satcom}, author = {Vahid Joroughi and Carlos Mosquera} } @conference {844, title = {Link adaptation in mobile satellite links: field trials results}, booktitle = {8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop}, year = {2016}, month = {09/2016}, keywords = {compass, satcom}, author = {Anxo Tato and Carlos Mosquera and Iago G{\'o}mez} } @article {828, title = {Link adaptation in mobile satellite links: schemes for different degrees of CSI knowledge}, journal = {International Journal of Satellite Communications and Networking}, volume = {34}, year = {2016}, month = {09/2016}, pages = {679-694}, keywords = {compass, satcom}, author = {Alberto Rico-Alvari{\~n}o and Jesus Arnau and Carlos Mosquera} } @article {926, title = {Low complexity hybrid precoding strategies for millimeter wave communication systems}, journal = {IEEE Trans. Wireless Communications}, volume = {15}, year = {2016}, month = {12/2016}, pages = {8380 - 8393}, abstract = {

Millimeter communication systems use large antenna arrays to provide good average received power and to take advantage of multi-stream MIMO communication. Unfortunately, due to power consumption in the analog front-end, it is impractical to perform beamforming and fully digital precoding at baseband. Hybrid precoding/combining architectures have been proposed to overcome this limitation. The hybrid structure splits the MIMO processing between the digital and analog domains, while keeping the performance close to that of the fully digital solution. In this paper, we introduce and analyze several algorithms that efficiently design hybrid precoders and combiners starting from the known optimum digital precoder/combiner, which can be computed when perfect channel state information is available. We propose several low complexity solutions which provide different trade-offs between performance and complexity. We show that the proposed iterative solutions perform better in terms of spectral efficiency and/or are faster than previous methods in the literature. All of them provide designs which perform close to the known optimal digital solution. Finally, we study the effects of quantizing the analog component of the hybrid design and show that even with coarse quantization, the average rate performance is good.

}, keywords = {compass, mmWave}, doi = {10.1109/TWC.2016.2614495}, author = {Cristian Rusu and Roi M{\'e}ndez-Rial and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @article {866, title = {Multiantenna GLR detection of rank-one signals with known power spectral shape under spatially uncorrelated noise}, journal = {IEEE Transactions on Signal Processing}, volume = {64}, year = {2016}, month = {12/2016}, pages = {6269-6283}, chapter = {6269}, abstract = {

We establish the generalized likelihood ratio (GLR) test for a Gaussian signal of known power spectral shape and unknown rank-one spatial signature in additive white Gaussian noise with an unknown diagonal spatial correlation matrix. This is motivated by spectrum sensing problems in dynamic spectrum access (DSA), in which the temporal correlation of the primary signal can be assumed known up to a scaling, and where the noise is due to an uncalibrated receive array. For spatially independent identically distributed (i.i.d.) noise, the corresponding GLR test reduces to a scalar optimization problem, whereas the GLR detector in the general non-i.i.d. case yields a more involved expression, which can be computed via alternating optimization methods. Low signal-to-noise ratio (SNR) approximations to the detectors are given, together with an asymptotic analysis showing the influence on detection performance of the signal power spectrum and SNR distribution across antennas. Under spatial rank-P conditions, we show that the rank-one GLR detectors are consistent with a statistical criterion that maximizes the output energy of a beamformer operating on filtered data. Simulation results support our theoretical findings in that exploiting prior knowledge on the signal power spectrum can result in significant performance improvement.

}, keywords = {cognitive radio, compass}, issn = {1053-587X}, doi = {10.1109/TSP.2016.2601290}, author = {Josep Sala and Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Saeid Sedighi and Abbas Taherpour} } @conference {847, title = {Online EM-based distributed estimation in sensor networks with faulty nodes}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2016}, month = {09/2016}, address = {Budapest, Hungary}, abstract = {
This paper focuses on the problem of the distributed estimation of a parameter vector based on noisy observations regularly acquired by the nodes of a wireless sensor network and assuming that some of the nodes have faulty sensors. We propose two online schemes, both centralized and distributed, based on the Expectation-Maximization (EM) algorithm. These algorithms are able to identify and disregard the faulty nodes, and provide a refined estimate of the parameters each time instant after a new set of observations is acquired. Simulation results demonstrate that the centralized versions of the proposed online algorithms attain the same estimation error as the centralized batch EM, whereas the distributed versions come very close to matching the batch EM.
}, keywords = {compass, wsn}, author = {Pere Gimenez-Febrer and Alba Pag{\`e}s-Zamora and R. L{\'o}pez-Valcarce} } @article {929, title = {An overview of signal processing techniques for millimeter wave MIMO systems}, journal = {IEEE J. Selected Topics in Signal Processing. Special issue on Signal Processing for Millimeter Wave Wireless Communications}, volume = {10}, year = {2016}, month = {04/2016}, pages = {436 - 453}, abstract = {

Communication at millimeter wave (mmWave) frequencies is defining a new era of wireless communication. The mmWave band offers higher bandwidth communication channels versus those presently used in commercial wireless systems. The applications of mmWave are immense: wireless local and personal area networks in the unlicensed band, 5G cellular systems, not to mention vehicular area networks, ad hoc networks, and wearables. Signal processing is critical for enabling the next generation of mmWave communication. Due to the use of large antenna arrays at the transmitter and receiver, combined with radio frequency and mixed signal power constraints, new multiple-input multiple-output (MIMO) communication signal processing techniques are needed. Because of the wide bandwidths, low complexity transceiver algorithms become important. There are opportunities to exploit techniques like compressed sensing for channel estimation and beamforming. This article provides an overview of signal processing challenges in mmWave wireless systems, with an emphasis on those faced by using MIMO communication at higher carrier frequencies.

}, keywords = {compass, mmWave}, doi = {10.1109/JSTSP.2016.2523924}, author = {Robert W. Heath Jr. and Nuria Gonz{\'a}lez-Prelcic and Sundeep Rangan and Wonil Roh and Akbar M. Sayeed} } @article {852, title = {Properties of real and complex ETFs and their application to the design of low coherence frames}, journal = {Linear Algebra and its Applications}, volume = {508}, year = {2016}, month = {November, 2016}, pages = {81-90}, url = {http://www.sciencedirect.com/science/article/pii/S0024379516302555}, author = {Cristian Rusu and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {859, title = {Radar aided mmWave beam alignment in V2I communications supporting antenna diversity}, booktitle = {Information Theory and Applications Workshop (ITA}, year = {2016}, month = {January, 2016}, keywords = {compass, mmWave}, author = {Nuria Gonz{\'a}lez-Prelcic and R. M{\'e}ndez-Rial and R.W. Heath Jr.} } @conference {858, title = {Robust analog precoding designs for millimeter wave MIMO transceivers}, booktitle = {20th International ITG Workshop on Smart Antennas (WSA)}, year = {2016}, month = {March, 2016}, keywords = {compass, mmWave}, author = {Pengfei Xia and Robert Heath and Nuria Gonz{\'a}lez-Prelcic} } @article {927, title = {Robust analog precoding designs for millimeter wave MIMO transceivers with frequency and time division duplexing}, journal = {IEEE Trans. Communications}, volume = {64}, year = {2016}, month = {11/2016}, pages = {4622 - 4634}, abstract = {

Millimeter wave (mmWave) communication provides high data rates thanks to large arrays at the transmitter and receiver, coupled with large bandwidth channels. Exploiting the arrays is challenging due to the need to configure precoding at the transmitter based on the large frequency selective channel. In this paper, we exploit the power iteration principle and propose a robust analog precoding training algorithm that can be applied in both frequency division duplex transmission systems and time division duplex transmission systems with or without RF calibration. We further analyze the convergence of the proposed algorithm and show how it converges to the singular value decomposition optimality exponentially. We propose null space projection on top of the power iteration to form multiple orthogonal beams at the transmitter and receiver. Strongest tap selection with proper energy pruning is used to collect as much precoding gain as possible from a frequency selective fading channel. The exponential effective SINR mapping performance is evaluated and demonstrates that the overall approach works smoothly. Numerical simulation results demonstrate algorithm robustness and the algorithm works not only for the simplified mmWave directional channels, but also for more general rich scattering channels.

}, keywords = {compass, mmWave}, doi = {10.1109/TCOMM.2016.2604312}, author = {Pengfei Xia and Robert W. Heath Jr. and Nuria Gonz{\'a}lez-Prelcic} } @article {853, title = {Security in automotive radar and vehicular networks}, journal = {Microwave Journal}, year = {2016}, keywords = {compass, mmWave}, author = {E. R. Yeh and J. Choi and Nuria Gonz{\'a}lez-Prelcic and C. Bhat and R. W. Heath Jr.} } @article {832, title = {Technical Report for ID TNET-2015-00294 {\textquotedblleft}Optimal delay characteristic when the number of users is comparable to the number of rounds"}, year = {2016}, author = {Simon Oya and Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @article {865, title = {Technical Report TSC/SO/24082016: Filter design for delay-based anonymous communications}, year = {2016}, author = {Simon Oya and Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @conference {856, title = {The use of unit norm tight measurement matrices for one-bit compressed sensing}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2016}, month = {2016}, abstract = {

In this paper we analyze the mean squared error (MSE) for one-bit compressed sensing schemes based on measurement matrices that correspond to unit norm tight frames. We show that, as in the unquantized case, sensing with unit norm tight frames improves the MSE in the reconstruction of sparse vectors from one-bit measurements using l1\ and thresholding algorithms. From our analytical and experimental results we conclude that when implementing one-bit compressed sensing schemes with fixed measurement matrices unit norm tight frames are the measurements of choice

}, keywords = {compass, compressed sensing}, author = {C. Rusu and Nuria Gonz{\'a}lez-Prelcic and R. W. Heath Jr.} } @conference {839, title = {Wideband self-interference cancellation for better spectrum use}, booktitle = {IEEE WoWMoM 2016 Workshop on Fifth Generation Wireless}, year = {2016}, month = {06/2016}, keywords = {adaptive signal processing, compass, full duplex}, author = {Carlos Mosquera} } @conference {863, title = {Adaptive hybrid precoding and combining in mmWave multiuser MIMO systems based on compressed covariance estimation}, booktitle = {IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)}, year = {2015}, month = {December, 2015}, keywords = {compass, mmWave}, author = {R. M{\'e}ndez-Rial and Nuria Gonz{\'a}lez-Prelcic and R. W. Heath Jr.} } @conference {861, title = {Adaptive one-bit compressive sensing with application to low-precision receivers at mmWave}, booktitle = {IEEE Global Telecommunications Conf. (GLOBECOM), }, year = {2015}, month = {December, 2015}, keywords = {compass, mmWave}, author = {C. Rusu and R. M{\'e}ndez-Rial and Nuria Gonz{\'a}lez-Prelcic and R. W. Heath, Jr} } @article {1045, title = {On the analysis of scheduling in dynamic duplex multi-hop mmWave cellular systems}, journal = {IEEE Transactions on Wireless Communications}, volume = {14}, year = {2015}, month = {jun}, pages = {6028 {\textendash} 6042}, author = {Garc{\'\i}a-Rois, Juan and Gomez-Cuba, Felipe and Akdeniz, Mustafa Riza and Gonz{\'a}lez-Casta{\~n}o, Francisco Javier and Burguillo-Rial, Juan Carlos and Rangan, Sundeep and Lorenzo, Beatriz} } @conference {815, title = {Attack detectors for data aggregation in clustered sensor networks}, booktitle = {European Signal Processing Conf. (EUSIPCO)}, year = {2015}, month = {accepted}, pages = {2098-2102}, publisher = {EURASIP}, organization = {EURASIP}, address = {Nice, France}, abstract = {
Among many security threats to sensor networks, compromised sensing is particularly challenging due to the fact that it cannot be addressed by standard authentication approaches. We consider a clustered scenario for data aggregation in which an attacker injects a disturbance in sensor readings. Casting the problem in an estimation framework, we systematically apply the Generalized Likelihood Ratio approach to derive attack detectors. The analysis under different attacks reveals that detectors based on similarity of means across
clusters are suboptimal, with Bartlett{\textquoteright}s test for homoscedasticity constituting a good candidate when lacking a priori knowledge of the variance of the underlying distribution.
}, keywords = {adversarial signal processing, compass, wsn}, author = {R. L{\'o}pez-Valcarce and Daniel Romero} } @conference {816, title = {An attack on antenna subset modulation for millimeter-wave communication}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2015}, month = {04/2015}, pages = {2914-2918}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, abstract = {

Antenna subset modulation (ASM) is a physical layer security technique that is well suited for millimeter wave communication systems. The key idea is to vary the radiation pattern at the symbol rate by selecting one from a subset of patterns with a similar main lobe and different side lobes. This paper shows that ASM is not robust to an eavesdropper that makes multiple simultaneous measurements at multiple angles. The measurements are combined and used to formulate an estimation problem to undo the effects of the side lobe randomization. Simulations show the performance of the estimation algorithms and how the eavesdropper can effectively recover the information if the signal-to-noise ratio exceeds a certain threshold. Using fewer active radio frequency chains makes it harder for the attacker to recover the transmit symbol, at the expense of more grating lobes.

}, keywords = {adversarial signal processing, compass, mmWave}, author = {Cristian Rusu and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {817, title = {Augmented covariance estimation with a cyclic approach in DOA}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2015}, month = {04/2015}, pages = {2784-2788}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, abstract = {

High resolution direction-of-arrival (DOA) estimation is an important problem in many array signal processing applications. This paper proposes an augmented covariance estimator for DOA estimation. The new method exploits the periodicity of the covariance lags when the DOAs are assumed on a discrete grid with a certain resolution. Then, it achieves twice the resolution of typical methods such as the direct augmentable approach or forward backward spatial smoothing. When the sources are not on the discrete grid, an interpolated array manifold technique is proposed to mitigate the grid mismatch error.

}, keywords = {DOA estimation, Non-uniformly spaced arrays}, author = {Roi M{\'e}ndez-Rial and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {1033, title = {{Bandwidth occupancy of non-coherent wideband fading channels}}, booktitle = {IEEE International Symposium on Information Theory (ISIT)}, year = {2015}, author = {Gomez-Cuba, Felipe and Du, Jinfeng and M{\'e}dard, Muriel and Erkip, Elza} } @conference {804, title = {Blind Satellite Inter-Gateway Interference Mitigation}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2015}, month = {2015}, keywords = {compass, satcom}, author = {J. Arnau and C. Mosquera} } @conference {1035, title = {Capacity scaling in noncoherent wideband massive SIMO systems}, booktitle = {IEEE Information Theory Workshop (ITW)}, year = {2015}, month = {apr}, author = {Chowdhury, Mainak and Manolakos, Alexandros and Gomez-Cuba, Felipe and Erkip, Elza and Goldsmith, Andrea J} } @article {770, title = {Compression Limits for Random Vectors with Linearly Parameterized Second-Order Statistics}, journal = {IEEE Trans. Information Theory}, volume = {61}, year = {2015}, month = {03/2015}, pages = {1410-1425}, chapter = {1410}, abstract = {
The class of complex random vectors whose covariance
matrix is linearly parameterized by a basis of Hermitian
Toeplitz (HT) matrices is considered, and the maximum
compression ratios that preserve all second-order information
are derived {\textemdash} the statistics of the uncompressed vector must
be recoverable from a set of linearly compressed observations.
This kind of vectors arises naturally when sampling widesense
stationary random processes and features a number of
applications in signal and array processing.
Explicit guidelines to design optimal and nearly optimal
schemes operating both in a periodic and non-periodic fashion
are provided by considering two of the most common linear
compression schemes, which we classify as dense or sparse. It
is seen that the maximum compression ratios depend on the
structure of the HT subspace containing the covariance matrix of
the uncompressed observations. Compression patterns attaining
these maximum ratios are found for the case without structure as
well as for the cases with circulant or banded structure. Universal
samplers are also proposed to compress unknown HT subspaces.
}, keywords = {compass, compressed sensing}, doi = {10.1109/TIT.2015.2394784}, author = {Daniel Romero and R. L{\'o}pez-Valcarce and Geert Leus} } @article {769, title = {Cram{\'e}r-Rao Bounds for SNR Estimation of Oversampled Linearly Modulated Signals}, journal = {IEEE Trans. Signal Processing}, volume = {63}, year = {2015}, month = {04/2015}, pages = {1675-1683}, chapter = {1675}, abstract = {
Most Signal-to-noise ratio (SNR) estimators use the
receiver matched filter output sampled at the symbol rate, an
approach which does not preserve all information in the analog
waveform due to aliasing. Thus, it is relevant to ask whether
avoiding aliasing could improve SNR estimation. To this end, we
compute the corresponding data-aided (DA) and non-data-aided
(NDA) Cram{\'e}r-Rao bounds (CRBs). We adopt a novel dual filter
framework, which is shown to be information-preserving under
suitable conditions and considerably simplifies the analysis. It is
shown that the CRB can be substantially reduced by exploiting
any available excess bandwidth, depending on the modulation
scheme, the SNR range, and the estimator (DA or NDA) type.
}, keywords = {adaptive signal processing, compass, Cram{\'e}r-Rao bound (CRB), dynacs, oversampling, Signal-to-noise ratio (SNR)}, doi = {10.1109/TSP.2015.2396013}, author = {R. L{\'o}pez-Valcarce and J. Villares and J. Riba and W. Gappmair and C. Mosquera} } @conference {818, title = {Dictionary-free Hybrid Precoders and Combiners for mmWave MIMO Systems}, booktitle = {IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2015}, month = {06/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Stockholm, Sweden}, keywords = {compass, mmWave}, author = {Roi M{\'e}ndez-Rial and Cristian Rusu and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {812, title = {Distributed AoA-based Source Positioning in NLOS with Sensor Networks}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2015}, month = {04/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, abstract = {
This paper focuses on the problem of positioning a source using angle-of-arrival measurements taken by a wireless sensor network in which some of the nodes experience non-line-of-sight (NLOS) propagation conditions. In order to mitigate the errors induced by the nodes in NLOS, we derive an algorithm that combines the expectation-maximization algorithm with a weighted least-squares estimation of the source position so that the nodes in NLOS are eventually identified and discarded. Moreover, a distributed version of this algorithm based on a diffusion strategy that iteratively refines the position estimate while driving the network to a consensus is presented.
}, keywords = {compass, wsn}, author = {Pere Gimenez-Febrer and Alba Pag{\`e}s-Zamora and Silvana Silva Pereira and R. L{\'o}pez-Valcarce} } @conference {811, title = {Distributed TLS Estimation under Random Data Faults}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2015}, month = {04/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, abstract = {
This paper addresses the problem of distributed estimation of a parameter vector in the presence of noisy input and output data as well as data faults, performed by a wireless sensor network in which only local interactions among the nodes are allowed. In the presence of unreliable observations, standard estimators become biased and perform poorly in low signal-to-noise ratios. We propose two different distributed approaches based on the Expectation-Maximization algorithm: in the first one the regressors are estimated at each iteration,
whereas the second one does not require explicit regressor estimation. Numerical results show that the proposed methods approach the performance of a clairvoyant scheme with knowledge of the random data faults.
}, keywords = {compass, wsn}, author = {Silvana Silva Pereira and Alba Pag{\`e}s-Zamora and R. L{\'o}pez-Valcarce} } @mastersthesis {798, title = {Estimation, Detection, and Learning for Dynamic Spectrum Access}, volume = {Ph.D.}, year = {2015}, month = {05/2015}, school = {University of Vigo}, type = {Ph.D. Thesis}, address = {Vigo, Spain}, keywords = {cognitive radio, compass, dynacs, wsn}, author = {Daniel Romero} } @article {796, title = {Forensic detection of processing operator chains: recovering the history of filtered JPEG images}, journal = {IEEE Transactions on Information Forensics and Security}, year = {2015}, keywords = {compass, forensics}, doi = {10.1109/TIFS.2015.2424195}, author = {Valentina Conotter and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {806, title = {Frequency Reuse in Dual Satellite Settings: an Initial Evaluation of Full Duplex Operation}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2015}, keywords = {compass, full duplex, satcom}, author = {D. Marti{\~n}{\'a}n-Otero and C. Mosquera} } @article {767, title = {A Greedy Topology Design to Accelerate Consensus in Broadcast Wireless Sensor Networks}, journal = {Information Processing Letters}, volume = {115}, year = {2015}, month = {03/2015}, pages = {408-413}, chapter = {408}, abstract = {

We present techniques to improve convergence speed of distributed average consensus algorithms in wireless sensor networks by means of topology design. A broadcast network is assumed, so that only the transmit power of each node can be independently controlled, rather than each individual link. Starting with a maximally connected configuration in which all nodes transmit at full power, the proposed methods successively reduce the transmit power of a chosen node in order to remove one and only one link; nodes are greedily selected either in order to yield fastest convergence at each step, or if they have the largest degree in the network. These greedy schemes provide a good complexity-performance tradeoff with respect to full-blown global search methods. As a side benefit, improving the convergence speed also results in savings in energy consumption with respect to the maximally connected setting.

}, keywords = {compass, wsn}, doi = {10.1016/j.ipl.2014.11.009}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce} } @article {756, title = {Improving Area Coverage of Wireless Sensor Networks Via Controllable Mobile Nodes: a Greedy Approach}, journal = {Journal of Network and Computer Applications}, volume = {48}, year = {2015}, month = {02/2015}, pages = {1-13}, abstract = {
Reliable wide-area monitoring with Wireless Sensor Networks (WSNs) remains a problem of
interest: simply deploying more nodes to cover wider areas is generally not a viable solution, due to
deployment and maintenance costs and the increase in radio interference. One possible solution
gaining popularity is based on the use of a reduced number of mobile nodes with controllable
trajectories in the monitored field. In this framework, we present a distributed technique for iteratively
computing the trajectories of the mobile nodes in a greedy fashion. The static sensor nodes actively
assist the mobile nodes in this task by means of a bidding protocol, thus participating towards the goal
of maximizing the area coverage of the monitored field. The performance of the proposed technique is
evaluated on various simulation scenarios with different number of mobile and static nodes in terms of
achieved coverage and mean time to achieve X\% coverage. Comparison with previous state-of-the-art
techniques reveals the effectiveness and stability of the proposed method.
}, keywords = {compass, wsn}, doi = {10.1016/j.jnca.2014.10.007}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce} } @conference {819, title = {Low Complexity Hybrid Sparse Precoding and Combining in Millimeter Wave MIMO Systems}, booktitle = {IEEE Int. Conference on Communications (ICC)}, year = {2015}, month = {06/2015}, publisher = {IEEE}, organization = {IEEE}, address = {London, UK}, keywords = {compass, mmWave}, author = {Cristian Rusu and Roi M{\'e}ndez-Rial and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {862, title = {Low Resolution Adaptive Compressed Sensing for mmWave MIMO receivers}, booktitle = {Asilomar Conf. on Signals, Systems, and Computers}, year = {2015}, month = {November, 2015}, keywords = {compass, mmWave}, author = {C. Rusu and Nuria Gonz{\'a}lez-Prelcic and R.W. Heath Jr.} } @conference {1038, title = {A Microeconomic Approach to Data Trading in User Provided Networks}, booktitle = {IEEE Globecom Workshops}, year = {2015}, pages = {1{\textendash}7}, author = {Lorenzo, B and Gomez-Cuba, F and Garcia-Rois, J and Gonzalez-Castano, F J and Burguillo, J C} } @inbook {805, title = {Multibeam Joint Detection}, booktitle = {Cooperative and Cognitive Satellite Systems}, year = {2015}, publisher = {Elsevier}, organization = {Elsevier}, keywords = {satcom}, author = {J. Arnau and R. de Lamare and C. Mosquera} } @conference {809, title = {Multipath cancellation in broadband acoustic local positioning systems}, booktitle = {IEEE 9th International Symposium on Intelligent Signal Processing (WISP)}, year = {2015}, month = {05/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Siena, Italy}, abstract = {

This work proposes a novel method to estimate the Line-of-Sight Time-of-Flights (LOS-TOFs) in a broadband acoustic local positioning system (ALPS) with strong multipath interference. The proposed method is based on the Matching Pursuit channel estimation algorithm that provides a low complexity approximation to the Maximum Likelihood solution for sparse channels. A multichannel version of this algorithm has been implemented to estimate a minimum of three coefficients in the channel responses of a particular ALPS, composed of four beacons that perform the simultaneous emission of BPSK modulated 255-bit Kasami codes. A statistical analysis of performance has been carried out by using a set of test signals synthetically generated to simulate different positions and reflection coefficients of the environment. The results of this analysis show the enhanced capability of the proposed method to estimate the LOS-TOFs under strong multipath interference, with respect to that of a classical system based on correlation + thresholding.

}, keywords = {compass, wsn}, doi = {10.1109/WISP.2015.7139174}, author = {Fernando J. Alvarez and R. L{\'o}pez-Valcarce} } @conference {777, title = {Multivariate Lattices for Encrypted Image Processing}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing}, year = {2015}, month = {04/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, keywords = {homomorphic encryption, lattice cryptography, SPED}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {822, title = {Pushing for higher rates and efficiency in Satcom: the different perspectives within SatNExIV}, booktitle = {Twelfth International Symposium on Wireless Communication Systems (ISWCS)}, year = {2015}, address = {Brussels}, keywords = {satcom}, author = {Miguel {\'A}ngel V{\'a}zquez and Ana P{\'e}rez Neira and Carlos Mosquera and Bhavani Shankar and Pol Henarejos and Athanasios Panagopoulos and Giovanni Giambene and Vasilios Siris and George Polyzos and Nader Alagha} } @conference {807, title = {Robust Adaptive Coding and Modulation Scheme for the Mobile Satellite Forward Link}, booktitle = {IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC}, year = {2015}, keywords = {compass, satcom}, author = {Alberto Rico-Alvari{\~n}o and Anxo Tato and Carlos Mosquera} } @conference {810, title = {Spectrum Cartography using quantized observations}, booktitle = {IEEE Int. Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2015}, month = {04/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Brisbane, Australia}, abstract = {
This work proposes a spectrum cartography algorithm used for learning the power spectrum distribution over a wide frequency band across a given geographic area. Motivated by low-complexity sensing hardware and stringent communication constraints, compressed and quantized measurements are considered. Setting out from a nonparametric regression framework, it is shown that a sensible approach leads to a support vector machine formulation. The simulated tests verify that accurate spectrum maps can be constructed using a simple sensing architecture with significant savings in the feedback.
}, keywords = {cognitive radio, compass, compressed sensing, spectrum sensing}, author = {Daniel Romero and Seung-Jun Kim and R. L{\'o}pez-Valcarce and Georgios Giannakis} } @conference {808, title = {Subspace-constrained SINR optimization in MIMO full-duplex relays under limited dynamic range}, booktitle = {IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2015}, month = {06/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Stockholm, Sweden}, abstract = {
We propose a method for maximizing the signal-to-interference-plus-noise ratio (SINR) in a wideband full-duplex MIMO regenerative relay that accounts limited dynamic range of the receiver and transmitter impairments. Transmit and receive filters are designed at the relay, by means of an alternating minimization algorithm, to minimize the interference at the decoder input in the destination node. We impose channel shortening and subspace constraints to ensure that the received signal at the destination is not compromised. Simulation results show that the presented method significantly outperforms other constrained approaches.
}, keywords = {adaptive signal processing, compass, full duplex}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {797, title = {An SVD Approach to Forensic Image Resampling Detection}, booktitle = {EUSIPCO}, year = {2015}, month = {09/2015}, pages = {2112-2116}, abstract = {
This paper describes a new strategy for image resampling detection whenever the applied resampling factor is larger than one. Delving into the linear dependencies induced in an image after the application of an upsampling operation, we show that interpolated images belong to a subspace defined by the interpolation kernel. Within this framework, by computing the SVD of a given image block and a measure of its degree of saturated pixels per row/column, we derive a simple detector capable of discriminating between upsampled images and genuine images. Furthermore, the proposed detector shows remarkable results with blocks of small size and outperforms state-of-the-art methods.
}, keywords = {compass, digital image forensics, resampling detection, SVD, tampering detection}, author = {David V{\'a}zquez-Pad{\'\i}n and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {748, title = {Active Interference Cancellation for OFDM Spectrum Sculpting: Linear Processing is Optimal}, journal = {IEEE Communications Letters}, volume = {18}, year = {2014}, month = {09/2014}, pages = {1543-1546}, chapter = {1543}, abstract = {

Active interference cancellation (AIC) is a multicarrier spectrum sculpting technique which reduces the power of undesired out-of-band emissions by adequately modulating a subset of reserved cancellation subcarriers. In most schemes online complexity is a concern, and thus cancellation subcarriers have traditionally been constrained to linear combinations of the data subcarriers. Recent AIC designs truly minimizing out-of-band emission shift complexity to the offline design stage, motivating the consideration of more general mappings to improve performance. We show that there is no loss in optimality incurred by constraining these mappings to the set of linear functions.

}, keywords = {cognitive radio, compass, dynacs, spectrum shaping}, doi = {10.1109/LCOMM.2014.2338316}, author = {Schmidt, J.F. and Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {734, title = {Antenna competition to boost Active Interference Cancellation in cognitive MIMO-OFDM}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)}, year = {2014}, address = {A Coru{\~n}a, Spain}, abstract = {Active Interference Cancellation (AIC) techniques for OFDM spectrum sculpting have gained interest over the last years, and several extensions to the MIMO case have been recently proposed. However, these designs do not fully exploit the spatial diversity provided by the multiple transmit antennas, as canceler allocation is fixed. This paper proposes a more general mechanism for the allocation of the cancellation subcarriers across antennas in order to better exploit spatial diversity. In particular, we present a novel AIC design for cognitive MIMOOFDM systems, in which transmit antennas compete against each other for a fixed number of cancellation subcarriers. We show that this more general allocation approach results in significant performance improvements with respect to previous designs.}, keywords = {cognitive radio, dynacs, spectrum shaping}, doi = {10.1109/SAM.2014.6882392}, author = {Schmidt, J.F. and R. L{\'o}pez-Valcarce} } @conference {730, title = {Are you threatening me? Towards smart detectors in watermarking}, booktitle = {Media Watermarking, Security, and Forensics}, year = {2014}, month = {02/2014}, publisher = {SPIE}, organization = {SPIE}, address = {San Francisco, CA, USA}, keywords = {adversarial signal processing, watermarking}, doi = {10.1117/12.2036415}, author = {Mauro Barni and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Benedetta Tondi} } @conference {750, title = {Balancing Closed and Open Loop CSI in Mobile Satellite Link Adaptation}, booktitle = {Proc. ASMS \& SPSC}, year = {2014}, address = {Livorno, Italy}, keywords = {dynacs, satcom}, doi = {10.1109/ASMS-SPSC.2014.6934548}, author = {Alberto Rico-Alvari{\~n}o and Arnau, Jesus and Carlos Mosquera} } @conference {758, title = {A Benford-Fourier JPEG compression detector}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2014}, address = {Paris, France}, keywords = {compass, forensics}, doi = {10.1109/ICIP.2014.7026077}, author = {Cecilia Pasquini and Fernando P{\'e}rez-Gonz{\'a}lez and Giulia Boato} } @conference {761, title = {Bootstrap-based Proxy Reencryption for Private Multi-user Computing}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2014}, month = {12/2014}, publisher = {IEEE}, organization = {IEEE}, address = {Atlanta, GA}, keywords = {SPED}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Serena Caputo} } @conference {771, title = {Channel estimation in millimeter wave MIMO systems with one-bit quantization}, booktitle = {Asilomar Conf. on Signals, Systems and Computers}, year = {2014}, keywords = {adaptive signal processing, compass, mmWave}, doi = {10.1109/ACSSC.2014.7094595}, author = {Jianhua Mo and Phil Schniter and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {765, title = {Circular Sparse Rulers Based On Co-prime Sampling For Compressive Power Spectrum Estimation}, booktitle = {IEEE Global Communications Conference}, year = {2014}, month = {12/2014}, publisher = {IEEE}, organization = {IEEE}, address = {Austin, TX}, keywords = {cognitive radio, compass, compressed sensing}, doi = {10.1109/GLOCOM.2014.7037272}, author = {Nuria Gonz{\'a}lez-Prelcic and M. E. Dom{\'\i}ngez-Jim{\'e}nez} } @mastersthesis {742, title = {Cognitive and Signal Processing Techniques for Improved Spectrum Exploitation in Wireless Communications}, year = {2014}, school = {Universidade de Vigo}, address = {Vigo}, keywords = {cognitive radio, satcom}, author = {Alberto Rico-Alvari{\~n}o} } @conference {762, title = {Cooperative compressive power spectrum estimation}, booktitle = {IEEE Sensor Array Multichannel Signal Process. Workshop (SAM)}, year = {2014}, keywords = {cognitive radio, wsn}, author = {Dyonisius D Ariananda and Daniel Romero and Geert Leus} } @conference {753, title = {Detecting Misreporting Attacks to the Proportional Fair Scheduler}, booktitle = {IEEE Workshop on Information Forensics and Security (WIFS)}, year = {2014}, month = {12/2014}, address = {Atlanta, USA}, abstract = {
The Proportional Fair Scheduler (PFS) has become
a popular channel-aware resource allocation method in wireless
networks, as it effectively exploits multiuser diversity while
providing fairness to users. PFS decisions on which mobile station
(MS) to schedule next are based on Channel Quality Indicator
(CQI) values. Since CQI values are reported by the MSs to the
scheduler, network performance can be severely degraded if some
malicious MSs report forged information. Previous approaches to
this security issue are based either on modifying PFS, which may
be undesirable in some contexts, or authenticating CQI reports
by periodic transmission of challenges, which increases overhead.
Instead, we propose to detect misreporting attackers, based on the
time correlation features of the wireless channel. Our approach
does not require scheduler modification, and it does not increase
overhead. Simulation results under realistic settings are provided
to show the effectiveness of the proposed test.
}, keywords = {adversarial signal processing, compass}, doi = {10.1109/WIFS.2014.7084310}, author = {Schmidt, J.F. and R. L{\'o}pez-Valcarce} } @conference {741, title = {Dissection of multibeam satellite communications with a large-scale antenna system toolbox}, booktitle = {European Wireless 2014 (EW2014)}, year = {2014}, pages = {548-553}, address = {Barcelona, Spain}, abstract = {

Current multibeam satellite systems consist of a very large number of spot beams. In this paper, we analyze them from the large scale MIMO perspective, and establish a comparison with massive MIMO systems. It will be shown that the large number of beams has important operational implications, and that it simplifies the analysis because it allows using asymptotic results. However, it will also be shown that multibeam satellite systems cannot be considered massive MIMO systems.

}, keywords = {dynacs, large-scale analysis, Massive MIMO, multibeam satellites, Multiuser detection, satcom}, doi = {ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6843099}, author = {Arnau, Jesus and Carlos Mosquera} } @conference {731, title = {Distributed Total Least Squares Estimation over Networks}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2014}, address = {Florence, Italy}, abstract = {

We consider Total Least Squares (TLS) estimation in a network in which each node has access to a subset of equations of an overdetermined linear system. Previous distributed approaches require that the number of equations at each node be larger than the dimension L of the unknown parameter. We present novel distributed TLS estimators which can handle as few as a single equation per node. In the first scheme, the network computes an extended correlation matrix via standard iterative average consensus techniques, and the TLS estimate is extracted afterwards by means of an eigenvalue decomposition (EVD). The second scheme is EVD-free, but requires that a linear system of size L be solved at each iteration by each node. Replacing this step by a single Gauss-Seidel subiteration is shown to be an effective means to reduce computational cost without sacrificing performance.

}, keywords = {dynacs, wsn}, doi = {10.1109/ICASSP.2014.6855074}, author = {R. L{\'o}pez-Valcarce and Silvana Silva Pereira and Alba Pag{\`e}s-Zamora} } @conference {747, title = {Do dummies pay off? Limits of dummy traffic protection in anonymous communications}, booktitle = {Privacy Enhancing Technologies Symposium}, year = {2014}, keywords = {anonymous communications, compass, disclosure attacks, dummies}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {726, title = {FER prediction with variable codeword length}, booktitle = {ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM)}, year = {2014}, address = {Florence, Italy}, abstract = {

Frame error rate (FER) prediction in wireless communication systems is an important tool with applications to system level simulations and link adaptation, among others. Although in realistic communication scenarios it is expected to have codewords of different lengths, previous work on FER prediction marginally treated the dependency of the FER on the codeword length. In this paper, we present a method to estimate the FER using codewords of different length. We derive a low complexity FER estimator for frames of different length transmitted over a binary symmetric channel of unknown error probability. We extend this technique to coded systems by the use of effective SNR FER predictors. The proposed estimation scheme is shown to outperform other simpler estimation methods.

}, keywords = {adaptive signal processing, compass, dynacs, Effective SNR, FER prediction, PHY abstraction}, doi = {10.1109/ICASSP.2014.6853935}, author = {Alberto Rico-Alvari{\~n}o and Robert W. Heath Jr. and Carlos Mosquera} } @conference {736, title = {Flat Fading Channel Estimation Based on Dirty Paper Coding}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2014}, address = {Florence, Italy}, abstract = {

A novel complex flat fading channel estimation scheme is proposed. Contrarily to previous schemes in the literature, this new approach is not based on introducing pilot sequences, but on reducing the \ interference caused by the information-bearing signal on the estimation-aiding signal by using Dirty Paper Coding. \ We show through simulations that our method outperforms the \ Partially-Data Dependent scheme, which is a state-of-the-art technique based on superimposed pilots.\ 

}, keywords = {channel estimation, dirty paper coding, dynacs, superimposed pilots}, doi = {10.1109/ICASSP.2014.6854852}, author = {Gabriel Dom{\'\i}nguez-Conde and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {733, title = {How to Implement Doubly-Stochastic Matrices for Consensus-Based Distributed Algorithms}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)}, year = {2014}, address = {A Coru{\~n}a, Spain}, abstract = {
Doubly-stochastic matrices are usually required by
consensus-based distributed algorithms. We propose a simple
and efficient protocol and present some guidelines for implementing
doubly-stochastic combination matrices even in noisy,
asynchronous and changing topology scenarios. The proposed
ideas are validated with the deployment of a wireless sensor
network, in which nodes run a distributed algorithm for robust
estimation in the presence of nodes with faulty sensors.
}, keywords = {compass, dynacs, wsn}, doi = {10.1109/SAM.2014.6882409}, author = {S. Valc{\'a}rcel-Macua and C. Moreno-Le{\'o}n and J. S. Romero and Silvana Silva Pereira and Javier Zazo and Alba Pag{\`e}s-Zamora and R. L{\'o}pez-Valcarce and S. Zazo} } @article {739, title = {Learning-Based Adaptive Transmission for Limited Feedback Multiuser MIMO-OFDM}, journal = {IEEE Transactions on Wireless Communications}, year = {2014}, keywords = {adaptive signal processing, dynacs}, doi = {10.1109/TWC.2014.2314104}, author = {Alberto Rico-Alvari{\~n}o and Robert W. Heath Jr.} } @article {759, title = {A Least Squares Approach to the Static Traffic Analysis of High-Latency Anonymous Communication Systems}, journal = {IEEE Transactions on Information Forensics and Security}, year = {2014}, doi = {10.1109/TIFS.2014.2330696}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso and Simon Oya} } @conference {751, title = {Low-Power Active Interference Cancellation for OFDM Spectrum Sculpting}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2014}, month = {09/2014}, abstract = {
We present a low-power design for Active Interference
Cancellation (AIC) sculpting of the OFDM spectrum, based
on sparse design concepts. Optimal AIC designs compute
cancellation weights based on contributions from all data subcarriers.
Thus, as the number of subcarriers grows, power
consumption becomes a concern, and suboptimal solutions
that avoid involving all subcarriers are of interest. In this context,
we present novel sparse AIC designs based on a zeronorm
minimization of the matrix defining the cancellation
weights. These designs drastically reduce the number of operations
per symbol, and thus the power consumption, while allowing
to tune the loss with respect the optimal design. They
can be efficiently obtained and significantly outperform usual
thresholding or sparsity-inducing l_1-norm minimization approaches.
}, url = {http://www.eurasip.org/Proceedings/Eusipco/Eusipco2014/HTML/papers/1569912103.pdf}, author = {Schmidt, J.F. and Daniel Romero and R. L{\'o}pez-Valcarce} } @article {766, title = {MIMO precoding and combining solutions for millimeter wave systems}, journal = {IEEE Communications Magazine}, volume = {52}, year = {2014}, month = {12/2014}, pages = {122-131}, abstract = {

Millimeter-wave communication is one way to alleviate the spectrum gridlock at lower frequencies while simultaneously providing high-bandwidth communication channels. MmWave makes use of MIMO through large antenna arrays at both the base station and the mobile station to provide sufficient received signal power. This article explains how beamforming and precoding are different in MIMO mmWave systems than in their lower-frequency counterparts, due to different hardware constraints and channel characteristics. Two potential architectures are reviewed: hybrid analog/digital precoding/combining and combining with low-resolution analog- to-digital converters. The potential gains and design challenges for these strategies are discussed, and future research directions are highlighted.

}, keywords = {adaptive signal processing, compass, mmWave}, doi = {10.1109/MCOM.2014.6979963}, author = {Ahmed Alkhateeb and Jianhua Mo and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.} } @conference {757, title = {Multiple JPEG compression detection by means of Benford-Fourier coefficients}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2014}, month = {12/2014}, address = {Atlanta, GA}, author = {Cecilia Pasquini and Giulia Boato and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {740, title = {Nearly-Optimal Compression Matrices for Signal Power Estimation}, booktitle = {IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2014}, address = {Toronto, Canada}, keywords = {cognitive radio, dynacs}, doi = {10.1109/SPAWC.2014.6941849}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {754, title = {A New Look At ML Step-Size Estimation for Scalar Costa Scheme Data Hiding}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2014}, address = {Paris, France}, author = {Gabriel Dom{\'\i}nguez-Conde and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @mastersthesis {749, title = {Neyman-Pearson Decision in Traffic Analysis}, year = {2014}, school = {University of New Mexico}, type = {PhD Thesis}, address = {Albquerque, NM, USA}, author = {Juan A. Elices} } @conference {727, title = {OFDM spectrum sculpting with active interference cancellation: Keeping spectral spurs at bay}, booktitle = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)}, year = {2014}, month = {05/2014}, pages = {1-5}, publisher = {IEEE}, organization = {IEEE}, address = {Florence, Italy}, keywords = {cognitive radio, dynacs, spectrum shaping}, doi = {10.1109/ICASSP.2014.6855169}, author = {Schmidt, J.F. and R. L{\'o}pez-Valcarce} } @mastersthesis {778, title = {On-Ground Processing for Spectral Efficiency Improvement in Next Generation Satellite Communications}, year = {2014}, school = {Universidade de Vigo}, type = {PhD thesis}, address = {Vigo, Spain}, abstract = {
The eternal demand of improved spectrum exploitation for next generation satellite communications requires the study of techniques that are potentially able of a breakthrough. In this thesis we focus on two of the main issues hindering the performance of satellite communications.
In the first part of the thesis, we study the use of multi-user detection techniques in the return link of multibeam satellite systems operated with an aggressive frequency reuse strategy. We start by comparing their performance with respect to a traditional scenario, and study the possibility of splitting the processing between the gateway and the satellite to cope with practical constraints. We then study the fundamental performance limits of such a system when spatially correlated rain attenuation affects the users; analytical expressions are obtained for the high and low SNR regimes. Finally, we consider non perfect channel state information and obtain, through random matrix theory, an approximation of the residual error as a function of the system{\textquoteright}s parameters.
In the second part, we focus on link adaptation for mobile satellite communications. For the return link, we investigate the potential of open-loop channel state information, which is timely but scarcely accurate; the finding that this information is better than the traditional closed-loop one depending on the channel conditions motivated the study of an adaptive algorithm to dynamically balance both. Finally, in the forward link we considered the case where retransmissions are available, and designed the optimum modulation and coding scheme sequence for the different retransmissions of a packet in terms of throughput.
}, keywords = {satcom}, author = {Arnau, Jesus} } @conference {755, title = {The optimal attack to histogram-based forensic detectors is simple(x)}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2014}, month = {12/2014}, pages = {137-142}, address = {Atlanta, GA}, keywords = {compass, Multimedia security}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {744, title = {Performance of the Multibeam Satellite Return Link with Correlated Rain Attenuation}, journal = {IEEE Transactions on Wireless Communications}, year = {2014}, pages = {1-1}, abstract = {

Rain attenuation is among the major impairments for satellite systems operating in the K band and above. In this paper, we investigate the impact of spatially correlated rain attenuation on the performance of a multibeam satellite return link. For a comprehensive assessment, an analytical model for the antenna pattern that generates the beams is also proposed. We focus on the outage capacity of the link, and obtain analytical approximations at high and low SNR. The derived approximations provide insights on the effect of key system parameters {\textendash} like the inter-user distance, the satellite beam radius, or the rain intensity{\textendash} and simulation results show that it fits tightly to the Monte Carlo results. Additionally, the derived expressions can be easily particularized for the single-user case, providing some novel insights.

}, keywords = {Antennas, Approximation methods, Attenuation, Correlation, dynacs, Rain, satcom, Satellites, Signal to noise ratio}, doi = {10.1109/TWC.2014.2329682}, author = {Arnau, Jesus and Christopoulos, D. and Chatzinotas, S. and C. Mosquera and Ottersten, B.} } @conference {763, title = {Power spectrum blind sampling using optimal multicoset sampling patterns in the MSE sense}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2014}, keywords = {cognitive radio, dynacs}, doi = {10.1109/ICASSP.2014.6853758}, author = {Bamrung TauSiesakul and Nuria Gonz{\'a}lez-Prelcic} } @conference {1044, title = {Practical Smart Grid Traffic Management in Leased Internet Access Networks}, booktitle = {IEEE International Energy Conference (ENERGYCON)}, year = {2014}, abstract = {

We demonstrate the practical implementation of a schema for Smart Grid Last Mile (SGLM) traffic management in leased Internet access networks, based on well-known queue management and traffic marking algorithms such as Random Early Drop and Token Bucket. Internet access links are often over-provisioned, with much higher installed capacity than user needs, so domestic applications do not compete for bandwidth. In this scenario the additional load posed by SGLM traffic is negligible. On some occasions, however, Internet access links are moder- ately stressed and traffic management techniques are required for SGLM traffic to coexist seamlessly with user traffic. In a previous paper, we formulated a theoretical model for SGLM traffic in general networks, and a management solution for its coexistence with user traffic in the particular case of leased Internet access networks. In the present paper, we demonstrate the feasibility of that solution in a practical scenario. We have implemented the traffic management policies on real hardware and employed SGLM traffic generators to evaluate our schema in a real network. The results indicate that our proposal achieves low- latency SGLM communications in a scenario with high domestic user traffic

}, author = {Gomez-Cuba, Felipe and Gonz{\'a}lez-Casta{\~n}o, Francisco Javier and P{\'e}rez-Garrido, Carlos P.} } @conference {1037, title = {Scaling laws for infrastructure single and multihop wireless networks in wideband regimes}, booktitle = {IEEE International Symposium on Information Theory (ISIT)}, year = {2014}, pages = {76{\textendash}80}, address = {Honolulu}, abstract = {

With millimeter wave bands emerging as a strong candidate for 5G cellular networks, next-generation systems may be in a unique position where spectrum is plentiful. To assess the potential value of this spectrum, this paper derives scaling laws on the per mobile downlink feasible rate with large bandwidth and number of nodes, for both Infrastructure Single Hop (ISH) and Infrastructure Multi-Hop (IMH) architectures. It is shown that, for both cases, there exist \emph{critical bandwidth scalings} above which increasing the bandwidth no longer increases the feasible rate per node. These critical thresholds coincide exactly with the bandwidths where, for each architecture, the network transitions from being degrees-of-freedom-limited to power-limited. For ISH, this critical bandwidth threshold is lower than IMH when the number of users per base station grows with network size. This result suggests that multi-hop transmissions may be necessary to fully exploit large bandwidth degrees of freedom in deployments with growing number of users per cell.

}, author = {Gomez-Cuba, Felipe and Rangan, Sundeep and Erkip, Elza} } @conference {764, title = {Sensitivity of compressive sensing architectures based on time interleaved analog-to-digital converters to channel mismatches}, booktitle = {IEEE International New Circuits and Systems Conference (NEWCAS)}, year = {2014}, keywords = {dynacs}, doi = {10.1109/NEWCAS.2014.6933981}, author = {Roi M{\'e}ndez-Rial and J.M. Caurel-Carrera and Nuria Gonz{\'a}lez-Prelcic} } @conference {732, title = {SINR Optimization in Wideband Full-Duplex MIMO Relays under Limited Dynamic Range}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)}, year = {2014}, address = {A Coru{\~n}a, Spain}, keywords = {adaptive signal processing, compass, full duplex}, doi = {10.1109/SAM.2014.6882369}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @article {735, title = {Spectrum Sensing for Wireless Microphone Signals using Multiple Antennas}, journal = {IEEE Trans. on Vehicular Technology}, volume = {63}, year = {2014}, month = {11/2014}, pages = {4395-4407}, chapter = {4395}, abstract = {Spectrum sensors for cognitive radio are expected to deploy multiple antennas in order to overcome the noise uncertainty problem and minimize the effects of small-scale fading. Despite the requirement that these sensors must detect wireless microphone (WM) signals, works in the literature have focused either on general purpose multiantenna detectors, or single antenna WM detectors. We exploit the spatial structure and particular properties of WM waveforms to derive four multiantenna detectors for WM signals with different performance/ complexity tradeoffs. These detectors are based on the generalized likelihood ratio test, which is derived under several signal models exploiting either the fact that the bandwidth of a WM signal never exceeds 200 kHz, the property that these signals have a constant magnitude, or both. The proposed detectors do not require synchronization with the WM signal and are robust to the noise uncertainty problem as well as to small-scale fading. Using the simulation guidelines from the IEEE 802.22 standard, the novel multiantenna WM detectors are shown to outperform previous schemes, thus demonstrating the advantages of exploiting spatial correlation along with WM signal structure.}, keywords = {cognitive radio, dynacs}, doi = {10.1109/TVT.2014.2316513}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @article {728, title = {Technical Report TSC/FPG/20032014: Performance Analysis of the Least Squares Disclosure Attack with Time-Varying User Behavior}, year = {2014}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso and Simon Oya} } @article {738, title = {Technical Report TSC/SO/02052014: Derivation of the Mean Squared Error of the Least Squares Estimator in a Timed Pool Mix with Dummy Traffic}, year = {2014}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {752, title = {Technical Report UV/TSC/APU/02102014: Multivariate Ring Learning with Errors}, year = {2014}, institution = {University of Vigo}, issn = {UV/TSC/APU/02102014}, author = {Alberto Pedrouzo-Ulloa and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {729, title = {Transportation-theoretic image counterforensics to first significant digit histogram forensics}, booktitle = {IEEE International Conference on Audio, Speech, and Signal Processing (ICASSP)}, year = {2014}, month = {05/2014}, publisher = {IEEE}, organization = {IEEE}, address = {Florence, Italy}, author = {Cecilia Pasquini and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {760, title = {Understanding the Effects of Real-World Behavior in Statistical Disclosure Attacks}, booktitle = {IEEE Workshop on Information Forensics and Security}, year = {2014}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {693, title = {Adaptive Self-interference Cancellation in Wideband Full-Duplex Decode-and-Forward MIMO Relays}, booktitle = {IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2013}, month = {06/2013}, address = {Darmstadt, Germany}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/SPAWC.2013.6612074}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {697, title = {Analytical Characterization of the Single Frequency Network Gain Using Effective SNR Metrics}, booktitle = {The Tenth International Symposium on Wireless Communication Systems 2013 (ISWCS 2013)}, year = {2013}, address = {Ilmenau, Germany}, abstract = {

The design of broadcasting networks operating in a single frequency way is challenging due to the difficulty of predicting the performance in a frequency selective channel, caused by natural multipath and echoes coming from different transmitters. In this paper we resort to the use of frame error rate prediction metrics (also known as effective SNR metrics) to characterize the performance gain (or loss) under different multipath and SNR regimes in a simplified scenario with two transmitters. The analysis shows clearly that receivers with a dominant line of sight reception and high SNR are more sensitive to the presence of echoes, while those users in low SNR or strong multipath conditions are easily enforced by the insertion of a second transmitter.

}, keywords = {broadcasting, dynacs, Effective SNR metrics, Single Frequency Network}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} } @conference {687, title = {Autocorrelation-based adaptation rule for feedback equalization in Wideband Full-Duplex Amplify-and-Forward MIMO relays}, booktitle = {Int. Conf. Acoust., Speech, Signal Process. (ICASSP)}, year = {2013}, abstract = {
Simultaneous reception and transmission in the same frequency, so-called full-duplex operation, causes an infinite feedback loop in an amplify-and-forward relay. The unwanted echoes may result in oscillation at the relay, making it unstable, and distorting the spectrum. This paper presents an adaptive MIMO filtering method for full-duplex amplify-and-forward relays that aims at solving the joint problem of self-interference mitigation and equalization of the source-relay channel. The scheme exploits knowledge of the autocorrelation of the transmitted signal as the only side information while allowing the relay, in the best case, to implement precoding as if there was not any self-interference or frequency selectivity in the source-relay channel. Finally, the proposed adaptation algorithm is investigated by determining its stationary points and by performing simulations in a MIMO-OFDM framework.
}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/ICASSP.2013.6638606}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {686, title = {Cancelling self-interference in full-duplex relays without Angle-of-Arrival information}, booktitle = {Int. Conf. Acoust., Speech, Signal Process. (ICASSP)}, year = {2013}, abstract = {
With full-duplex relays, simultaneous reception and transmission in
the same frequency produce self-interference distortion and relay oscillation,
hampering reception at the receiver end unless properly
mitigated. Previous adaptive methods for self-interference cancellation
using multiple receive antennas require knowledge of the direction
of arrival of the source signal. We present a novel architecture
and adaptive scheme for Amplify-and-Forward relays allowing cancellation
without such knowledge. The temporal filter is updated
under the property restoral paradigm in order to match the power
spectrum of the retransmitted signal to that of the source signal.
}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/ICASSP.2013.6638558}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce} } @article {711, title = {Choose Your Subcarriers Wisely: Active Interference Cancellation for Cognitive OFDM}, journal = {IEEE Journal on Emerging and Selected Topics in Circuits and Systems}, volume = {3}, year = {2013}, month = {12/2013}, pages = {615-625}, chapter = {615}, keywords = {cognitive radio, dynacs, spectrum shaping}, doi = {10.1109/JETCAS.2013.2280808}, author = {Schmidt, J.F. and Costas-Sanz, S. and R. L{\'o}pez-Valcarce} } @conference {691, title = {A Class of Circular Sparse Rulers for Compressive Power Spectrum Estimation}, booktitle = {European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco)}, year = {2013}, month = {09/2013}, keywords = {cognitive radio, dynacs}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @article {678, title = {A Cognitive Mobile BTS Solution with Software-Defined Radioelectric Sensing}, journal = {Sensors}, volume = {13}, year = {2013}, month = {02/2013}, pages = { 2051-2075}, chapter = { 2051}, abstract = {

Private communications inside large vehicles such as ships may be effectively provided using standard cellular systems. In this paper we propose a new solution based on software-defined radio with electromagnetic sensing support. Software-defined radio allows low-cost developments and, potentially, added-value services not available in commercial cellular networks. The platform of reference, OpenBTS, only supports single-channel cells. Our proposal, however, has the ability of changing BTS channel frequency without disrupting ongoing communications. This ability should be mandatory in vehicular environments, where neighbouring cell configurations may change rapidly, so a moving cell must be reconfigured in real-time to avoid interferences. Full details about frequency occupancy sensing and the channel reselection procedure are provided in this paper. Moreover, a procedure for fast terminal detection is proposed. This may be decisive in emergency situations, e.g., if someone falls overboard. Different tests confirm the feasibility of our proposal and its compatibility with commercial GSM terminals.

}, keywords = {cognitive radio, dynacs, mobile communications, SDR, vehicular communications}, doi = {10.3390/s130202051}, author = {J. Mu{\~n}oz and J. Vales-Alonso and F. Qui{\~n}oy-Garc{\'\i}a and Costas-Sanz, S. and M. Pillado and F.J. Gonz{\'a}lez-Casta{\~n}o and M. Garc{\'\i}a-Sanchez and R. L{\'o}pez-Valcarce and C. L{\'o}pez-Bravo} } @conference {725, title = {Compressive Angular and Frequency Periodogram Reconstruction for Multiband Signals}, booktitle = {IEEE Int. Workshop Comput. Advances Multi-Sensor Adaptive Process (CAMSAP)}, year = {2013}, address = {San Martin}, keywords = {cognitive radio, dynacs}, doi = {10.1109/CAMSAP.2013.6714102}, author = {Ariananda, D. D. and Daniel Romero and Geert Leus} } @conference {681, title = {Compressive Covariance Sampling}, booktitle = {Inform. Theory Appl. Workshop}, year = {2013}, month = {Feb.}, pages = {1-8}, keywords = {cognitive radio, dynacs}, doi = {10.1109/ITA.2013.6502949}, author = {Daniel Romero and Geert Leus} } @conference {685, title = {Compressive wideband spectrum sensing with spectral prior information}, booktitle = {Int. Conf. Acoust., Speech, Signal Process. (ICASSP)}, year = {2013}, abstract = {
Wideband spectrum sensing provides a means to determine
the occupancy of channels spanning a broad range of frequencies.
Practical limitations impose that the acquisition should
be accomplished at a low rate, much below the Nyquist lower
bound. Dramatic rate reductions can be obtained by the observation
that only a few parameters need to be estimated in
typical spectrum sensing applications. This paper discusses
the joint estimation of the power of a number of channels,
whose power spectral density (PSD) is known up to a scale
factor, using compressive measurements. First, relying on
a Gaussian assumption, an efficient approximate maximum
likelihood (ML) technique is presented. Next, a least-squares
estimator is applied for the general non-Gaussian case.
}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/ICASSP.2013.6638505}, author = {Daniel Romero and R. L{\'o}pez-Valcarce and Geert Leus} } @conference {720, title = {Coping with the enemy: Advances in adversary-aware signal processing}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2013}, month = {05/2013}, pages = {8682{\textendash}8686}, address = {Vancouver, Canada}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6639361}, author = {Mauro Barni and Fernando P{\'e}rez-Gonz{\'a}lez} } @proceedings {708, title = {Cross Layer Link Adaptation in Time Varying Mobile Satellite Channels with Statistical and Outdated CSIT}, journal = {Asilomar Conference on Signals Systems and Computers}, year = {2013}, keywords = {dynacs, satcom}, doi = {10.1109/ACSSC.2013.6810481}, author = {Alberto Rico-Alvari{\~n}o and J. Arnau and Carlos Mosquera} } @article {676, title = {On the design of a novel two-objective harmony search approach for distance- and connectivity-based localization in wireless sensor networks}, journal = {Engineering Applications of Artificial Intelligence}, volume = {26}, year = {2013}, month = {02/2013}, pages = {669-676}, chapter = {669}, keywords = {dynacs, wsn}, doi = {10.1016/j.engappai.2012.06.002}, author = {Diana Manjarres and Javier Del Ser and Sergio Gil-Lopez and Massimo Vecchio and Itziar Landa-Torres and Sancho Salcedo-Sanz and R. L{\'o}pez-Valcarce} } @conference {684, title = {A Diffusion-based distributed EM algorithm for density estimation in wireless sensor networks}, booktitle = {Int. Conf. Acoust., Speech, Signal Process. (ICASSP)}, year = {2013}, abstract = {
Distributed implementations of the Expectation-Maximization
(EM) algorithm reported in the literature have been proposed for
applications to solve specific problems. In general, a primary
requirement to derive a distributed solution is that the
structure of the centralized version enables the computation
involving global information in a distributed fashion. This
paper treats the problem of distributed estimation of Gaussian
densities by means of the EM algorithm in wireless sensor
networks using diffusion strategies, where the information
is gradually diffused across the network for the computation
of the global functions. The low-complexity implementation
presented here is based on a two time scale operation
for information averaging and diffusion. The convergence to
a fixed point of the centralized solution has been studied and
the appealing results motivates our choice for this model. Numerical
examples provided show that the performance of the
distributed EM is, in practice, equal to that of the centralized
scheme.
}, keywords = {dynacs, wsn}, doi = {10.1109/ICASSP.2013.6638501}, author = {Silvana Silva Pereira and Alba Pag{\`e}s-Zamora and R. L{\'o}pez-Valcarce} } @article {682, title = {A Diffusion-Based EM Algorithm for Distributed Estimation in Unreliable Sensor Networks}, journal = {IEEE Signal Processing Letters}, volume = {20}, year = {2013}, month = {06/2013}, pages = {595-598}, chapter = {595}, abstract = {

We address the problem of distributed estimation of a parameter from a set of noisy observations collected by a sensor network, assuming that some sensors may be subject to data failures and report only noise. In such scenario, simple schemes such as the Best Linear Unbiased Estimator result in an error floor in moderate and high signal-to-noise ratio (SNR), whereas previously proposed methods based on hard decisions on data failure events degrade as the SNR decreases. Aiming at optimal performance within the whole range of SNRs, we adopt a Maximum Likelihood framework based on the Expectation-Maximization (EM) algorithm. The statistical model and the iterative nature of the EM method allow for a diffusion-based distributed implementation, whereby the information propagation is embedded in the iterative update of the parameters. Numerical examples show that the proposed algorithm practically attains the Cramer{\textendash}Rao Lower Bound at all SNR values and compares favorably with other approaches.

}, keywords = {dynacs, wsn}, doi = {10.1109/LSP.2013.2260329}, author = {Silvana Silva Pereira and R. L{\'o}pez-Valcarce and Alba Pag{\`e}s-Zamora} } @conference {719, title = {The flow fingerprinting game}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2013}, month = {11/2013}, pages = {97{\textendash}102}, address = {Guangzhou, China}, author = {Juan A. Elices and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {702, title = {Forensic analysis of full-frame linearly filtered JPEG images}, booktitle = {IEEE International Conference on Image Processing}, year = {2013}, month = {JPEG compression}, pages = {4517-4521}, address = {Melbourne, Australia}, keywords = {JPEG compression, linear filtering}, author = {Valentina Conotter and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {683, title = {Fully Private Noninteractive Face Verification}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {8}, year = {2013}, month = {07/2013}, pages = {1101-1114}, keywords = {SPED}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Daniel Gonz{\'a}lez-Jim{\'e}nez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {710, title = {Joint detection of full-frame linear filtering and JPEG compression in digital images}, booktitle = {IEEE International Workshop on Information Forensics and Security}, year = {2013}, month = {11/2013}, publisher = {IEEE}, organization = {IEEE}, address = {Guangzhou, China}, author = {Valentina Conotter and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {712, title = {Lattice implementation of adaptive channel shortening in multicarrier transmission over IIR channels}, journal = {EURASIP Journal on Advances in Signal Processing}, volume = {2013:174}, year = {2013}, month = {11/2013}, doi = {10.1186/1687-6180-2013-174}, url = {http://asp.eurasipjournals.com/content/2013/1/174}, author = {E. Ben Salem and S. Cherif and H. Besbes and R. L{\'o}pez-Valcarce} } @conference {699, title = {Learning Based Link Adaptation in Multiuser MIMO-OFDM}, booktitle = {21st European Signal Processing Conference 2013 (EUSIPCO 2013)}, year = {2013}, address = {Marrakech, Morocco}, abstract = {

Link adaptation in multiple user multiple-input multiple-output orthogonal frequency division multiplexing communication systems is challenging because of the coupling between user selection, mode selection, precoding, and equalization. In this paper, we present a methodology to perform link adaptation under this multiuser setting, focusing on the capabilities of IEEE 802.11ac. We propose to use a machine learning classifier to solve the problem of selecting a proper modulation and coding scheme, combined with a greedy algorithm that performs user and spatial mode selection. We observe that our solution offers good performance in the case of perfect channel state information or high feedback rate, while those scenarios with less feedback suffer some degradation due to inter-user interference.

}, keywords = {dynacs, link adaptation, Machine Learning, Multiuser MIMO-OFDM}, author = {Alberto Rico-Alvari{\~n}o and Robert W. Heath Jr.} } @article {675, title = {Least Squares Disclosure Attacks: User Profiling for Mix-based Anonymous Communication Systems}, year = {2013}, month = {01/2013}, institution = {University of Vigo}, address = {Vigo}, issn = {UV/TSC/FPG/30052012}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @conference {709, title = {Link Adaptation in MIMO-OFDM with Practical Impairments}, booktitle = {Asilomar Conference on Signals Systems and Computers}, year = {2013}, keywords = {dynacs, link adaptation, MIMO-OFDM}, doi = {10.1109/ACSSC.2013.6810579}, author = {Alberto Rico-Alvari{\~n}o and Robert W. Heath Jr.} } @conference {688, title = {Localization of Forgeries in MPEG-2 Video through GOP Size and DQ analysis}, booktitle = {IEEE International Workshop on Multimedia Signal Processing (MMSP)}, year = {2013}, pages = {494-499}, address = {Pula (Sardinia), Italy}, abstract = {

This work addresses forgery localization in MPEG-2 compressed videos. The proposed method is based on the analysis of Double Quantization (DQ) traces in frames that were encoded twice as intra (i.e., I-frames). \ Employing a state-of-the-art method, such frames are located in the video under analysis by estimating the size of the Group Of Pictures (GOP) that was used in the first compression; then, the DQ analysis is devised for the MPEG-2 encoding scheme and applied to frames that were intra-coded in both the first and second compression. In such a way, regions that were manipulated between the two encodings are detected. Compared to existing methods based on double quantization analysis, the proposed scheme makes forgery localization possible on a wider range of settings.

}, author = {Daniele Labartino and Tiziano Bianchi and Alessia De Rosa and Marco Fontani and David V{\'a}zquez-Pad{\'\i}n and Alessandro Piva and Mauro Barni} } @proceedings {718, title = {Locating Tor hidden services through an interval-based traffic-correlation attack}, journal = {2013 IEEE Conference on Communications and Network Security (CNS)}, year = {2013}, month = {10/2013}, pages = {385{\textendash}386}, address = {Washington, DC}, author = {Juan A. Elices and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {692, title = {Low Complexity Primary User Protection for Cognitive OFDM}, booktitle = {European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco)}, year = {2013}, month = {09/2013}, keywords = {cognitive radio, dynacs, spectrum shaping}, author = {Schmidt, J.F. and R. L{\'o}pez-Valcarce} } @conference {695, title = {Meet the Family of Statistical Disclosure Attacks}, booktitle = {GlobalSIP}, year = {2013}, month = {12/2013}, author = {Simon Oya and Carmela Troncoso and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {689, title = {MMSE Performance Analysis of Generalized Multibeam Satellite Channels}, journal = {Communications Letters, IEEE}, year = {2013}, pages = {1-4}, keywords = {dynacs, linear minimum mean square error receivers, multibeam satellites, Multiuser detection, return link, satcom}, doi = {10.1109/LCOMM.2013.052013.122658}, author = {Christopoulos, D. and J. Arnau and Chatzinotas, S. and C. Mosquera and Ottersten, B.} } @proceedings {717, title = {Near optimal detection of quantized signals and application to JPEG forensics}, journal = {2013 IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2013}, month = {11/2013}, pages = {168-173}, address = {Guangzhou, China}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6707813}, author = {Tiziano Bianchi and Alessandro Piva and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {677, title = {A novel heuristic approach for distance- and connectivity-based multihop node localization in wireless sensor networks}, journal = {Soft Computing}, volume = {17}, year = {2013}, month = {01/2013}, pages = {17-28}, chapter = {17}, keywords = {dynacs, wsn}, doi = {10.1007/s00500-012-0897-2}, author = {Diana Manjarres and Javier Del Ser and Sergio Gil-Lopez and Massimo Vecchio and Itziar Landa-Torres and R. L{\'o}pez-Valcarce} } @conference {705, title = {Open Loop Adaptive Coding and Modulation for Mobile Satellite Return Links}, booktitle = {31st AIAA International Communications Satellite Systems Conference}, year = {2013}, publisher = {American Institute of Aeronautics and Astronautics}, organization = {American Institute of Aeronautics and Astronautics}, address = {Florence, Italy}, keywords = {dynacs, link adaptation, satcom}, doi = {doi:10.2514/6.2013-5704}, author = {Arnau, Jesus and Carlos Mosquera} } @conference {690, title = {Optimal counterforensics for histogram-based forensics}, booktitle = {IEEE International Conference on Audio, Speech and Signal Processing}, year = {2013}, pages = {3048-3052}, publisher = {IEEE}, organization = {IEEE}, address = {Vancouver, Canada}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {715, title = {Power Spectrum Blind Sampling Using Minimum Mean Square Error and Weighted Least Squares}, booktitle = {Asilomar Conference on Signals, Systems and Computers}, year = {2013}, month = {11/2013}, keywords = {cognitive radio, dynacs}, doi = {10.1109/ACSSC.2013.6810249}, author = {Bamrung TauSiesakul and Nuria Gonz{\'a}lez-Prelcic} } @article {647, title = {Privacy-Preserving Data Aggregation in Smart Metering Systems: An Overview}, journal = {IEEE Signal Processing Magazine}, volume = {30}, year = {2013}, month = {03/2013}, pages = {75-86}, keywords = {SPED}, author = {Zekeriya Erkin and Juan Ram{\'o}n Troncoso-Pastoriza and Reginald Lagendijk and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {703, title = {Quantization lattice estimation for multimedia forensics}, booktitle = {IEEE International Conference on Image Processing}, year = {2013}, pages = {4452-4456}, address = {Melbourne, Australia}, keywords = {Dual lattice, lattice estimation, multimedia forensics, noisy estimation}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Noelia Liste} } @article {646, title = {Secure Signal Processing in the Cloud: enabling technologies for privacy-preserving multimedia cloud processing}, journal = {IEEE Signal Processing Magazine}, volume = {30}, year = {2013}, month = {03/2013}, pages = {29-41}, keywords = {SPED}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {701, title = {Set-Membership Identification of Resampled Signals}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2013}, address = {Guangzhou, China}, abstract = {

The problem of resampling factor estimation as a means for tampering detection has been largely investigated. Most of the existing techniques rely on the analysis of cyclic correlations induced in the resampled signal. However, in this paper, a new direction is explored by addressing the same problem in terms of the set-membership estimation theory. The proposed technique constructs a model of the problem using available a priori knowledge and in consonance with a finite number of observations that comes from the resampled signal under study. With this information, the proposed technique is able to provide an estimate of the resampling factor applied to the original signal and, if required, an estimate of such signal and an estimate of the interpolation filter. The performance in terms of accuracy and MSE of the proposed approach is evaluated and comparative results with state-of-the-art methods are reported.

}, author = {David V{\'a}zquez-Pad{\'\i}n and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {1041, title = {{Smart Grid Last-Mile Communications Model and Its Application to the Study of Leased Broadband Wired-Access}}, journal = {IEEE Transactions on Smart Grid}, volume = {4}, year = {2013}, month = {mar}, pages = {5{\textendash}12}, abstract = {

This paper addresses the modeling of specific Smart Grid (SG) communication requirements from a data networking research perspective, as a general approach to the study of different access technologies suitable for the last mile (LM). SGLM networks serve customers{\textquoteright} Energy Services Interfaces. From functional descriptions of SG, a traffic model is developed. It is then applied to the study of an access architecture based on leased lines from local broadband access providers. This permits consideration of the potential starvation of domestic traffic, which is avoided by applying well-known traffic management techniques. From previous results obtained for a purpose-built WiMAX SGLM network, the intuition that a leased broadband access yields lower latencies is verified. In general, the proposed traffic model simplifies the design of benchmarks for the comparison of candidate access technologies.

}, author = {Gomez-Cuba, Felipe and Asorey-Cacheda, Rafael and Gonz{\'a}lez-Casta{\~n}o, Francisco Javier} } @conference {694, title = {Spectrum Sensing in Time-Varying Channels Using Multiple Antennas}, booktitle = {IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt (Germany)}, year = {2013}, month = {06/2013}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/SPAWC.2013.6612027}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {698, title = {Statistical Cross Layer Adaptation in Fast Fading Mobile Satellite Channels}, booktitle = {Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC)}, year = {2013}, address = {Atlanta, USA}, abstract = {

Link adaptation in mobile satellite channels is difficult because of the large propagation delays, the frequent signal blockage and the variation of the channel statistics. In this paper, we propose a cross-layer link adaptation strategy that exploits statistical, long-term CSI to increase the throughput when some retransmissions are available; this increase is obtained while meeting a target outage probability constraint. Our strategy takes as inputs the estimated packet error rates of the available modulation and coding schemes (MCS) and their rates; as an output, it returns the optimum sequence of MCS to be used. Results will also show that simple information acquisition strategies can still provide very good results.

}, keywords = {dynacs, fast fading channels, link adaptation, mobile satellite, satcom}, doi = {10.1109/GLOCOM.2013.6831502}, author = {Alberto Rico-Alvari{\~n}o and J. Arnau and C. Mosquera} } @conference {704, title = {Taking advantage of source correlation in forensic analysis}, booktitle = {IEEE International Workshop on Multimedia Signal Processing}, year = {2013}, pages = {159-164}, address = {Pula (Sardinia), Italy}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {724, title = {Wideband Spectrum Sensing From Compressed Measurements Using Spectral Prior Information}, journal = {IEEE Trans. Signal Process.}, volume = {61}, year = {2013}, pages = {6232-6246}, keywords = {cognitive radio, compressed sensing, dynacs, spectrum sensing}, issn = {1053-587X}, doi = {10.1109/TSP.2013.2283473}, author = {Daniel Romero and Geert Leus} } @article {651, title = {An Adaptive Feedback Canceller for Full-Duplex Relays Based on Spectrum Shaping}, journal = {IEEE J. Selected Areas in Communications}, volume = {30}, year = {2012}, month = {08/2012}, pages = {1566 - 1577}, abstract = {
Although full-duplex relaying schemes are appealing\ in order to improve spectral efficiency, simultaneous reception\ and transmission in the same frequency results in selfinterference,
distorting the retransmitted signal and making\ the relay prone to oscillation. Current feedback cancellation\ techniques by means of adaptive filters are hampered by the fact\ that the useful and interference signals are highly correlated. We\ present a new adaptive algorithm which effectively and blindly
restores the spectral shape of the desired signal. In contrast
with previous schemes, the novel adaptive feedback canceller has\ low complexity, does not introduce additional delay in the relay\ station, and partly compensates for multipath propagation.
}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/JSAC.2012.120923}, author = {R. L{\'o}pez-Valcarce and Emilio Antonio-Rodr{\'\i}guez and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {652, title = {Adaptive self-interference suppression for full-duplex relays with multiple receive antennas}, booktitle = {IEEE 13th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012)}, year = {2012}, month = {07/2012}, publisher = {IEEE}, organization = {IEEE}, address = {{\c C}esme, Turkey}, abstract = {
In full-duplex relays, simultaneous reception and transmission
in the same frequency results in self-interference which\ distorts the retransmitted signal and makes the relay prone\ to oscillation. We present an adaptive feedback canceller for\ multiple-input single-output (MISO) relays, efficiently combining\ spatial and temporal processing. The receive array is\ adaptively steered towards the minimum variance distortionless\ response (MVDR), whereas the temporal filter update is\ based on a novel low-complexity spectrum shaping scheme\ which avoids introducing additional delay in the relay station.
}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/SPAWC.2012.6292948}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce} } @conference {641, title = {Adaptive Transmission Techniques for Mobile Satellite Links}, booktitle = {30th AIAA International Communications Satellite Systems Conference (ICSSC)}, year = {2012}, address = {Ottawa, Canada}, keywords = {dynacs, satcom}, author = {Arnau, Jesus and Alberto Rico-Alvari{\~n}o and C. Mosquera} } @conference {680, title = {Analysis and Design of Multirate Synchronous Sampling Schemes for Sparse Multiband Signals}, booktitle = { European Signal Processing Conference (EUSIPCO 2012)}, year = {2012}, month = {08/2012}, pages = {1184-1188}, abstract = {

We consider the problem of developing efficient sampling
schemes for multiband sparse signals. Previous results on
multicoset sampling implementations that lead to universal
sampling patterns (which guarantee perfect reconstruction),
are based on a set of appropriate interleaved analog to digital converters, all of them operating at the same sampling
frequency. In this paper we propose an alternative multirate
synchronous implementation of multicoset codes, that is, all
the analog to digital converters in the sampling scheme operate at different sampling frequencies, without need of introducing any delay. The interleaving is achieved through the
usage of different rates, whose sum is significantly lower than
the Nyquist rate of the multiband signal. To obtain universal
patterns the sampling matrix is formulated and analyzed. Appropriate choices of the parameters, that is the block length
and the sampling rates, are also proposed
}, keywords = {compressive sampling, Kruskal rank, multiband sparse signal, Multicoset sampling, multirate sampling, universal pattern}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @conference {679, title = {Design of universal multicoset sampling patterns for compressed sensing of multiband sparse signals}, booktitle = { IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2012}, month = {03/2012}, pages = {3337 - 3340}, address = {Kyoto (Japan)}, abstract = {

Many problems in digital communications involve wideband radio signals. As the most recent example, the impressive advances in Cognitive Radio systems make even more necessary the development of sampling schemes for wideband radio signals with spectral holes. This is equivalent to considering a sparse multiband signal in the framework of Compressive Sampling theory. Starting from previous results on multicoset sampling and recent advances in compressive sampling, we analyze the matrix involved in the corresponding reconstruction equation and define a new method for the design of universal multicoset codes, that is, codes guaranteeing perfect reconstruction of the sparse multiband signal.

}, isbn = {978-1-4673-0044-5}, doi = {10.1109/ICASSP.2012.6288630}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic and Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce} } @conference {660, title = {Detection and information theoretic measures for quantifying the distinguishability between multimedia operator chains}, booktitle = {IEEE Workshop on Information Forensics and Security}, year = {2012}, publisher = {IEEE}, organization = {IEEE}, address = {Tenerife, Spain}, author = {Pedro Comesa{\~n}a} } @conference {654, title = {Detection of Gaussian signals in unknown time-varying channels}, booktitle = {IEEE Statistical Signal Processing Workshop (SSP 2012)}, year = {2012}, month = {08/2012}, publisher = {IEEE}, organization = {IEEE}, address = {Ann Arbor, MI}, abstract = {
Detecting the presence of a white Gaussian signal distorted by a\ noisy time-varying channel is addressed by means of three different\ detectors. First, the generalized likelihood ratio test (GLRT) is\ found for the case where the channel has no temporal structure, resulting\ in the well-known Bartlett{\textquoteright}s test. Then it is shown that, under\ the transformation group given by scaling factors, a locally most\ powerful invariant test (LMPIT) does not exist. Two alternative approaches\ are explored in the low signal-to-noise ratio (SNR) regime:\ the first assigns a prior probability density function (pdf) to the channel\ (hence modeled as random), whereas the second assumes an underlying\ basis expansion model (BEM) for the (now deterministic)\ channel and obtains the maximum likelihood (ML) estimates of the\ parameters relevant for the detection problem. The performance of\ these detectors is evaluated via Monte Carlo simulation.
}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/SSP.2012.6319858}, author = {Daniel Romero and Javier V{\'\i}a and R. L{\'o}pez-Valcarce and Ignacio Santamar{\'\i}a} } @conference {637, title = {Detection of unknown constant magnitude signals in time-varying channels}, booktitle = {3rd Int. Workshop on Cognitive Information Processing (CIP 2012) }, year = {2012}, month = {05/2012}, address = {Baiona, Spain}, abstract = {

Spectrum sensing constitutes a key ingredient in many cognitive radio paradigms in order to detect and protect primary transmissions. Most sensing schemes in the literature assume a time-invariant channel. However, when operating in low Signal-to-Noise Ratio (SNR) conditions, observation times are necessarily long and may become larger than the coherence time of the channel. In this paper the problem of detecting an unknown constant-magnitude waveform in frequency-flat time-varying channels with noise background of unknown variance is considered. The channel is modeled using a basis expansion model (BEM) with random coefficients. Adopting a generalized likelihood ratio (GLR) approach in order to deal with nuisance parameters, a non-convex optimization problem results. We discuss different possibilities to circumvent this problem, including several low complexity approximations to the GLR test as well as an efficient fixed-point iterative method to obtain the true GLR statistic. The approximations exhibit a performance ceiling in terms of probability of detection as the SNR increases, whereas the true GLR test does not. Thus, the proposed fixed-point iteration constitutes the preferred choice in applications requiring a high probability of detection.

}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/CIP.2012.6232933}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {662, title = {Detection of video double encoding with GOP size estimation}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2012}, month = {12/2012}, pages = {151-156}, publisher = {IEEE}, organization = {IEEE}, address = {Tenerife, Spain}, abstract = {

Video forensics is an emerging discipline, that aims at inferring information about the processing history undergone by a digital video in a blind fashion. In this work we introduce a new forensic footprint and, based on it, propose a method for detecting whether a video has been encoded twice; if this is the case, we also estimate the size of the Group Of Pictures (GOP) employed during the first encoding. As shown in the experiments, the footprint proves to be very robust even in realistic settings (i.e., when encoding is carried out using typical compression rates), that are rarely addressed by existing techniques.

}, author = {David V{\'a}zquez-Pad{\'\i}n and Marco Fontani and Tiziano Bianchi and Pedro Comesa{\~n}a and Alessandro Piva and Mauro Barni} } @conference {638, title = {On the Effect of Echoes in Hybrid Terrestrial-Satellite Single Frequency Networks: Analysis and Countermeasures}, booktitle = {2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012)}, year = {2012}, address = {Baiona, Spain}, abstract = {

Hybrid Terrestrial Satellite Single Frequency Networks achieve large spectral efficiencies due to a higher frequency reuse, which is attained by transmitting the same waveform in the same frequency band from satellite and terrestrial transmitters. However, the presence of multiple transmitters propitiates the existence of the so-called SFN echoes, which can degrade the system performance even if they arrive within the OFDM guard interval. In this paper we characterize this effect by resorting to PER prediction metrics (or effective SNR metrics), and analyze two simple preprocessing schemes that mitigate this degradation: the use of Alamouti space-time codes, and a convenient prefiltering at the terrestrial transmitter.

}, keywords = {dynacs, Effective SNR, Hybrid Terrestrial- Satellite, satcom, Satellite OFDM, Single Frequency Network, Space-Time Coding}, doi = {10.1109/ASMS-SPSC.2012.6333071}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} } @mastersthesis {674, title = {Encrypted Domain Processing for Signal Processing Applications}, year = {2012}, month = {04/2012}, school = {University of Vigo}, address = {Vigo}, author = {Juan Ram{\'o}n Troncoso-Pastoriza} } @conference {721, title = {Fingerprinting a flow of messages to an anonymous server.}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2012}, month = {12/2012}, pages = {97{\textendash}102}, address = {Tenerife, Spain}, author = {Juan A. Elices and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {655, title = {Fully Homomorphic Faces}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2012}, month = {10/2012}, publisher = {IEEE}, organization = {IEEE}, address = {Lake Buena Vista, Florida, USA}, keywords = {face verification, homomorphic processing, lattice cryptography, privacy, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {653, title = {Generalized matched filter detector for fast fading channels}, booktitle = {IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2012) }, year = {2012}, month = {07/2012}, publisher = {IEEE}, organization = {IEEE}, address = {Kyoto, Japan}, abstract = {
We consider the problem of detecting a known signal with\ constant magnitude immersed in noise of unknown variance,
when the propagation channel is frequency-flat and randomly
time-varying within the observation window. A Basis Expansion
Model with random coefficients is used for the channel,\ and a Generalized Likelihood Ratio approach is adopted in\ order to cope with deterministic nuisance parameters. The\ resulting scheme can be seen as a generalization of the well-known
Matched Filter detector, to which it reduces for timeinvariant
channels. Closed-form analytical expressions are\ provided for the distribution of the test statistic under both\ hypotheses, which allow to assess the detection performance.
}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/ICASSP.2012.6288587}, author = {Daniel Romero and R. L{\'o}pez-Valcarce and Geert Leus} } @conference {659, title = {IPTV streaming source classification}, booktitle = {IEEE Workshop on Information Forensics and Security}, year = {2012}, address = {Tenerife, Spain}, author = {Miguel Masciopinto and Pedro Comesa{\~n}a} } @conference {723, title = {A Least Squares approach to user profiling in pool mix-based anonymous communication systems.}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2012}, month = {12/2012}, pages = {115{\textendash}120}, address = {Tenerife, Spain}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @conference {661, title = {ML Estimation of the Resampling Factor}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2012}, month = {12/2012}, pages = {205-210}, publisher = {IEEE}, organization = {IEEE}, address = {Tenerife, Spain}, abstract = {

In this work, the problem of resampling factor estimation for tampering detection is addressed following the maximum likelihood criterion. By relying on the rounding operation applied after resampling, an approximation of the likelihood function of the quantized resampled signal is obtained. From the underlying statistical model, the maximum likelihood estimate is derived for one-dimensional signals and a piecewise linear interpolation. The performance of the obtained estimator is evaluated, showing that it outperforms state-of-the-art methods.

}, author = {David V{\'a}zquez-Pad{\'\i}n and Pedro Comesa{\~n}a} } @article {648, title = {Multiantenna GLR detection of rank-one signals with known power spectrum in white noise with unknown spatial correlation}, journal = {IEEE Trans. on Signal Processing}, volume = {60}, year = {2012}, month = {06/2012}, pages = {3065 - 3078}, abstract = {
Multiple-antenna detection of a Gaussian signal\ with spatial rank one in temporally white Gaussian noise with\ arbitrary and \ unknown spatial covariance is considered. This\ is motivated by spectrum sensing problems in the context of\ Dynamic Spectrum Access in which several secondary networks\ coexist but do not cooperate, creating a background of spatially\ correlated broadband interference. When the temporal correlation\ of the signal of interest is assumed known up to a scale factor,\ the corresponding Generalized Likelihood Ratio Test is shown to\ yield a scalar optimization problem. Closed-form expressions of\ the test are obtained for the general signal spectrum case in\ the low signal-to-noise ratio (SNR) regime, as well as for signals\ with binary-valued power spectrum in arbitrary SNR. The two\ resulting detectors turn out to be equivalent. An asymptotic\ approximation to the test distribution for the low-SNR regime is\ derived, closely matching empirical results from spectrum sensing\ simulation experiments.
}, keywords = {cognitive radio, dynacs}, doi = {10.1109/TSP.2012.2189767}, author = {Josep Sala and Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce} } @conference {657, title = {Multimedia operator chain topology and ordering estimation based on detection and information theoretic tools}, booktitle = {International Workshop on Digital-forensics and Watermarking}, year = {2012}, address = {Shanghai, China}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {642, title = {Multiuser Detection Performance in Multibeam Satellite Links under Imperfect CSI}, booktitle = {ASILOMAR 2012}, year = {2012}, address = {Pacific Grove, CA}, keywords = {dynacs, satcom}, doi = {10.1109/ACSSC.2012.6489048}, author = {Arnau, Jesus and C. Mosquera} } @conference {639, title = {Optimum Training for CSI Acquisition in Cognitive Radio Channels}, booktitle = {Asilomar Conference on Signals, Systems, and Computers}, year = {2012}, address = {Pacific Grove, CA}, keywords = {adaptive signal processing, cognitive radio, dynacs}, doi = {10.1109/ACSSC.2012.6488973}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} } @article {645, title = {Overlay Cognitive Transmission in a Multicarrier Broadcast Network with Dominant Line of Sight Reception}, journal = {IEEE Transactions on Wireless Communications}, year = {2012}, keywords = {cognitive radio, dynacs, satcom}, doi = {10.1109/TWC.2012.092112.120257}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {633, title = {Overlay cognitive transmission in OFDM point to point systems exploiting primary feedback}, booktitle = {3rd International Workshop on Cognitive Information Processing (CIP) }, year = {2012}, month = {05/2012}, address = {Baiona, Galicia, Spain}, abstract = {

A secondary user that tries to reuse the spectrum allocated to a primary user can exploit the knowledge of the primary message to perform this task. In particular, the overlay\  cognitive radio paradigm postulates the use of a fraction of the available power at the secondary transmitter to convey the primary message, so the spectral efficiency of the primary\  system is increased, and, therefore, some transmission resources (time slots or frequency bands) can be released to the secondary transmission while the primary user rate is kept constant. The fraction of released resources can be incremented if some channel state information is available at the secondary transmitter. In this paper, we present a scenario where the secondary transmitter maximizes the primary link quality (measured in terms of Effective SNR), and obtains its channel state information by exploiting the primary user SNR-based feedback.

}, keywords = {cognitive radio, dynacs}, doi = {10.1109/CIP.2012.6232932}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} } @proceedings {644, title = {Overlay Spectrum Reuse in a Broadcast Network: Covering the Whole Grayscale of Spaces}, journal = {IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012)}, year = {2012}, address = {Bellevue, WA}, keywords = {cognitive radio, dynacs}, doi = {10.1109/DYSPAN.2012.6478172}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} } @conference {634, title = {Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Coverage Analysis}, booktitle = {The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012)}, year = {2012}, address = {Cesme, Turkey}, abstract = {

A secondary cognitive user overlaying its message in a broadcast multicarrier network is studied. The secondary user exploits the primary message knowledge to convey its own information while preserving the primary user coverage area, determined by a bound on the BER, and taking into account the degradation due to the insertion of an echo in a dominant line of sight environment. The results are compared with those obtained when the coverage area is defined in capacity terms, and regardless of the degradation caused by the secondary replica of the primary message.

}, keywords = {cognitive radio, dynacs}, doi = {10.1109/SPAWC.2012.6292889}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {635, title = {Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Single Receiver Analysis}, booktitle = {The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012)}, year = {2012}, address = {Cesme, Turkey}, abstract = {

The overlay cognitive radio paradigm presents a framework where a secondary user exploits the knowledge of the primary user{\textquoteright}s message to improve spectrum utilization. A multicarrier broadcast network is one of the scenarios where this knowledge is possible: the secondary user could join a single frequency network and, therefore, gain access to the primary message. However, if the primary signal is received with a strong line of sight component, its relaying from the secondary transmitter does not suffice to ensure the primary user quality of service. In this paper we study the scenario where a secondary transmitter maximizes its own transmission rate, keeping the quality of a primary receiver over a given threshold. The analytical results, based on bit error rate bounds, are verified by means of software simulations and hardware tests.

}, keywords = {cognitive radio, dynacs}, doi = {10.1109/SPAWC.2012.6292890}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {640, title = {Performance Analysis of Multiuser Detection for Multibeam Satellites Under Rain Fading}, booktitle = {2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012)}, year = {2012}, address = {Baiona, Spain}, abstract = {

Multibeam satellite systems are nowadays widely employed, and their use is expected to grow in the next decades. This has raised the interest for signal processing techniques able to mitigate the interference among beams, since they could enable a much more aggressive spectrum reuse. From an engineering point of view, the design of the system must be no longer based on the capabilities provided by the usual physical layer; it should take into account the presence of these interference canceling techniques, predict their performance as accurately as possible -even under a number of impairments and non-idealities- and design accordingly in order to fully exploit them. In this paper, we investigate the effect of a practical impairment of great importance, namely, the attenuation due to the rain, on the performance of a return link which performs MMSE interference canceling. Analytical expressions are derived for a number of performance measures based on the statistical characterization of the rain attenuation.

}, keywords = {dynacs, hybrid beamforming, multibeam satellites., Multiuser detection, rain fading, satcom}, doi = {10.1109/ASMS-SPSC.2012.6333078}, author = {Arnau, Jesus and C. Mosquera} } @article {636, title = {Performance study of multiuser interference mitigation schemes for hybrid broadband multibeam satellite architectures}, journal = {EURASIP Journal on Wireless Communications and Networking}, volume = {2012}, year = {2012}, pages = {132}, issn = {1687-1499}, doi = {10.1186/1687-1499-2012-132}, url = {http://jwcn.eurasipjournals.com/content/2012/1/132}, author = {Arnau, Jesus and Bertrand Devillers and C. Mosquera and Ana P{\'e}rez-Neira} } @conference {722, title = {Understanding statistical disclosure: A least squares approach}, booktitle = {Privacy Enhancing Technologies Symposium (PETS)}, year = {2012}, month = {07/2012}, pages = {38{\textendash}57}, address = {Vigo, Spain}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Carmela Troncoso} } @conference {656, title = {On the Application of a Hybrid Harmony Search Algorithm to Node Localization in Anchor-based Wireless Sensor Networks}, booktitle = {IEEE International Conference on Intelligent Systems Design and Applications (ISDA)}, year = {2011}, author = {Diana Manjarres and Javier Del Ser and Sergio Gil-Lopez and Massimo Vecchio and Itziar Landa-Torres and R. L{\'o}pez-Valcarce} } @conference {romero2011bandlimited, title = {Bandlimited or Constant Envelope? Exploiting Waveform Properties in Wireless Microphone Detection}, booktitle = {International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)}, year = {2011}, month = {December}, pages = {17-20}, address = {San Juan, Puerto Rico}, keywords = {Bandlimited signals., Constant Magnitude, dynamic spectrum access, Wireless Microphones}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @article {669, title = {Bit Loading Using Imperfect CSIT for Prediction-Based Resource Allocation in Mobile OFDMA}, journal = {Vehicular Technology, IEEE Transactions on}, volume = {60}, year = {2011}, month = {oct.}, pages = {4082 -4088}, keywords = {bit loading, channel state information in the transmitter, CSIT, frequency division multiple access, imperfect channel prediction information, mobile OFDMA, mobile radio, mobile stations, OFDM modulation, orthogonal frequency division multiple access, prediction error, prediction-based resource allocation, radio transmitters, time-varying channels, wireless channel}, issn = {0018-9545}, doi = {10.1109/TVT.2011.2165305}, author = {Schmidt, J.F. and Cousseau, J.E. and Wichman, R. and Werner, S.} } @conference {Rico2011, title = {On the Co-existence of Primary and Secondary Transmitters in a Broadcast Network}, booktitle = {International Conference on Cognitive Radio and Advanced Spectrum Management}, year = {2011}, address = {Barcelona, Catalonia, Spain}, keywords = {Broadcast, cognitive radio, Overlay, Single Frequency Network}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {VazquezValcarceICASSP11, title = {Detection diversity of multiantenna spectrum sensors}, booktitle = {IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011)}, year = {2011}, month = {05/2011}, pages = {2936-2939}, publisher = {IEEE}, organization = {IEEE}, address = {Prague, Czech Republic}, abstract = {
In the context of spectrum sensing, we investigate the performance\ of detectors equipped with M antennas (co-located or\ distributed) under Rayleigh fading, in terms of detection diversity.\ Rather than the high-SNR concept of diversity order\ common in the communications literature, we adopt the notion\ recently advocated by Daher and Adve in the radar community:\ the slope of the average probability of detection (\bar{P}_D)\ vs. SNR curve at \bar{P}_D = 0.5. This definition is well suited to\ spectrum sensing, which invariably deals with low SNR levels.\ It is shown that the diversity order grows as M for an\ optimal centralized detector having access to all observations,\ whereas for the two distributed schemes considered (the multiantenna\ energy detector and the OR detector) it grows no\ faster than √M.
}, keywords = {cognitive radio, detection diversity, spectrum sensing}, author = {Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Ashish Pandharipande} } @article {RamirezVazquezTSP11, title = {Detection of Rank-{P} Signals in Cognitive Radio Networks With Uncalibrated Multiple Antennas}, journal = {IEEE Trans. on Signal Processing}, volume = {59}, number = {8}, year = {2011}, month = {08/2012}, pages = {3764-3774}, abstract = {
Spectrum sensing is a key component of the Cognitive\ Radio paradigm. Typically, primary signals have to be\ detected with uncalibrated receivers at signal-to-noise ratios\ (SNRs) well below decodability levels. Multiantenna detectors\ exploit spatial independence of receiver thermal noise to boost\ detection performance and robustness. We study the problem
of detecting a Gaussian signal with rank-P unknown spatial
covariance matrix in spatially uncorrelated Gaussian noise with
unknown covariance using multiple antennas. The generalized
likelihood ratio test (GLRT) is derived for two scenarios. In the
first one, the noises at all antennas are assumed to have the same\ (unknown) variance, whereas in the second, a generic diagonal\ noise covariance matrix is allowed in order to accommodate\ calibration uncertainties in the different antenna frontends. In\ the latter case, the GLRT statistic must be obtained numerically,\ for which an efficient method is presented. Furthermore, for\ asymptotically low SNR, it is shown that the GLRT does\ admit a closed form, and the resulting detector performs well\ in practice. Extensions are presented in order to account for\ unknown temporal correlation in both signal and noise, as well\ as frequency-selective channels.
}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/TSP.2011.2146779}, author = {David Ram{\'\i}rez and Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Javier V{\'\i}a and Ignacio Santamar{\'\i}a} } @conference {ScagliolaICC2011, title = {A Dirty Paper Scheme for Hierarchical OFDM}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2011}, month = {June}, address = {Kioto, Japan}, keywords = {dirty paper, Hierarchical OFDM, watermarking}, author = {Scagliola, Michele and Fernando P{\'e}rez-Gonz{\'a}lez and Guccione, Pietro} } @conference {5990448, title = {Distributed spectrum sensing with multiantenna sensors under calibration errors}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2011}, month = {june}, pages = {441 -445}, abstract = {

Spectrum sensing design for Cognitive Radio systems is challenged by the nature of the wireless medium, which makes the detection requirements difficult to achieve by standalone sensors. To combat shadowing and fading, distributed strategies are usually proposed. However, most distributed approaches are based on the energy detector, which is not robust to noise uncertainty. This phenomenon can be overcome by multi-antenna sensors exploiting spatial independence of the noise process. We combine both ideas to develop distributed detectors for multiantenna sensors. Fusion rules are provided for sensors based on the Generalized Likelihood Ratio as well as for ad hoc detectors derived from geometric considerations. Simulation results are provided comparing the performance of the different strategies under lognormal shadowing and Ricean fading.

}, keywords = {ad hoc detectors, antenna arrays, calibration, calibration errors, cognitive radio, energy detector, generalized likelihood ratio, log normal distribution, lognormal shadowing, multiantenna sensors, Ricean fading, spectrum sensing, wireless medium}, issn = {1948-3244}, doi = {10.1109/SPAWC.2011.5990448}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {MASS2011, title = {An Effective Metaheuristic Approach to Node Localization in Wireless Sensor Networks}, booktitle = {IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS)}, year = {2011}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce and Francesco Marcelloni} } @conference {troncosoICASSP11, title = {Efficient Protocols for Secure Adaptive Filtering}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2011}, month = {May}, pages = {5860-5863}, publisher = {IEEE}, organization = {IEEE}, address = {Prage, Czech Republic}, keywords = {adaptive filtering, privacy, security, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {troncosoCLOSER11, title = {Encrypted Domain Processing for Cloud Privacy: Concept and Practical Experience}, booktitle = {International Conference on Cloud Computing and Services Science (CLOSER)}, year = {2011}, month = {May}, address = {Noordwijkerhout, The Netherlands}, keywords = {cloud, privacy, security, watermarking}, author = {Daniel A. Rodr{\'\i}guez-Silva and F. Javier Gonz{\'a}lez-Casta{\~n}o and Lilian Adkinson-Orellana and Alexandre Fern{\'a}ndez-Cordeiro and Juan Ram{\'o}n Troncoso-Pastoriza and Daniel Gonz{\'a}lez-Mart{\'\i}nez} } @conference {dvazquez-iwdw11, title = {Exposing original and duplicated regions using SIFT features and resampling traces}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, year = {2011}, month = {10/2011}, pages = {306-320}, publisher = {Springer Berlin Heidelberg}, organization = {Springer Berlin Heidelberg}, address = {Atlantic City, USA}, abstract = {

A common type of digital image forgery is the duplication of a region in the same image to conceal something in a captured scene. The detection of region duplication forgeries has been recently addressed using methods based on SIFT features that provide points of the regions involved in the tampering and also the parameters of the geometric transformation between both regions. However, considering this output, there is not yet any information about which of the regions are originals and which are the duplicated ones. A reliable image forensic analysis must provide this information. In this paper, we propose to use a resampling-based method to provide an accurate way to distinguish the original and the tampered regions by analizing the resampling factor of each area. Comparative results are presented to evaluate the performance of the combination of both methods.

}, keywords = {Image forensics, region duplication, resampling estimation, SIFT}, doi = {10.1007/978-3-642-32205-1_25}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {ScagliolaTCOM11, title = {Gain-Invariant Dirty Paper Coding for Hierarchical OFDM}, journal = {IEEE Transactions on Communications}, volume = {59}, number = {12}, year = {2011}, month = {December}, pages = {3323-3334}, abstract = {

A novel approach is here presented to superimpose a low-priority data stream on a high-priority data stream for OFDM systems. The main improvement with respect to conventional hierarchical modulation, which is included with the same purpose in various wireless technologies, is that the low-priority data stream can be decoded from the received subcarrier symbols without any previous equalization for multipath fading channels. As a consequence, the expected performance is nearly invariant of the channel estimation method used to equalize the channel. The low-priority stream is inserted adopting a gain-invariant dirty paper coding based on Rational Dither Modulation, which was proposed for data hiding applications. In this paper an analysis of the developed system is presented and several simulations have been carried out using DVB-T system parameters to verify the validity of the proposed approach. The experimental results show the better performance of the proposed method with respect to that of a conventional hierarchical modulation, particularly when the accuracy of the estimated channel response decreases.

}, keywords = {dirty paper, dynacs, Hierarchical OFDM, watermarking}, issn = {0090-6778}, doi = {10.1109/TCOMM.2011.101011.100544}, author = {Scagliola, Michele and Fernando P{\'e}rez-Gonz{\'a}lez and Guccione, Pietro} } @conference {Arna1112:Hybrid, title = {Hybrid Space-Ground Processing for High-Capacity Multi-beam Satellite Systems}, booktitle = {IEEE GLOBECOM}, year = {2011}, note = {Selected Areas in Communications Symposium - Satellite \& Space Communications Track (GC{\textquoteright}11 - SAC - SSC)}, month = {dec}, address = {Houston, Texas, USA}, author = {Arnau, Jesus and Michael Bergmann and Enzo Alberto Candreva and Giovanni Emanuele Corazza and Riccardo {De Gaudenzi} and Bertrand Devillers and Wilfried Gappmair and Francesco Lombardo and C. Mosquera and Ana P{\'e}rez-Neira and Ilaria Thibault and Alessandro Vanelli-Coralli} } @conference {GDCDK2011, title = {Improving the Visual Performance of S/DISCUS}, booktitle = {IEEE International Conference on Multimedia and Expo (ICME)}, year = {2011}, month = {July}, address = {Barcelona, Catalonia}, keywords = {distributed source coding, keyless security, low-complexity video coding, Slepian-Wolf coding, watermarking, wireless multimedia sensor networks}, author = {Gabriel Dom{\'\i}nguez-Conde and Deepa Kundur} } @mastersthesis {800, title = {Interference and Network Management in Cognitive Communication Systems}, volume = {Ph.D.}, year = {2011}, month = {06/2011}, school = {University of Vigo}, type = {Ph.D. thesis}, address = {Vigo, Spain}, keywords = {cognitive radio, spectrum sensing}, author = {Gonzalo V{\'a}zquez-Vilar} } @conference {Devi1112:Joint, title = {Joint Linear Precoding and Beamforming for the Forward Link of Multi-Beam Broadband Satellite Systems}, booktitle = {IEEE GLOBECOM}, year = {2011}, note = {Selected Areas in Communications Symposium - Satellite \& Space Communications Track (GC{\textquoteright}11 - SAC - SSC)}, address = {Houston, Texas, USA}, author = {Bertrand Devillers and Ana Isabel Perez and C. Mosquera} } @article {670, title = {Low-Complexity Channel Prediction Using Approximated Recursive DCT}, journal = {Circuits and Systems I: Regular Papers, IEEE Transactions on}, volume = {58}, year = {2011}, month = {oct.}, pages = {2520 -2530}, keywords = {autoregressive modeling, autoregressive processes, basis expansion model, channel estimator, computational complexity, DCT, discrete cosine transform, discrete cosine transforms, Doppler frequencies, filter bank, Kalman filters, low-complexity channel prediction, OFDM modulation, OFDM systems, recursive formulation, steady-state Kalman filter, sum-of-sinusoids channel predictors, time-varying channels}, issn = {1549-8328}, doi = {10.1109/TCSI.2011.2158139}, author = {Schmidt, J.F. and Cousseau, J.E. and Wichman, R. and Werner, S.} } @conference {5990449, title = {Multiantenna detection of constant-envelope signals in noise of unknown variance}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2011}, month = {june}, pages = {446 -450}, abstract = {

Detection of unknown signals with constant modulus (CM) using multiple antennas in additive white Gaussian noise of unknown variance is considered. The channels from the source to each antenna are assumed frequency-flat and unknown. This problem is of interest for spectrum sensing in cognitive radio systems in which primary signals are known to have the CM property. Examples include analog frequency modulated signals such as those transmitted by wireless microphones in the TV bands and Gaussian Minimum Shift Keying modulated signals as in the GSM cellular standard. The proposed detector, derived from a Generalized Likelihood Ratio (GLR) approach, exploits both the CM property and the spatial independence of noise, outperforming the GLR test for Gaussian signals as shown by simulation.

}, keywords = {cognitive radio, multiantenna detection, spectrum sensing}, issn = {1948-3244}, doi = {10.1109/SPAWC.2011.5990449}, author = {Daniel Romero and R. L{\'o}pez-Valcarce} } @conference {RamirezVazquezICASSP11, title = {Multiantenna detection under noise uncertainty and primary user{\textquoteright}s spatial structure}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2011}, month = {May}, pages = {2948-2951}, publisher = {IEEE}, organization = {IEEE}, address = {Prage, Czech Republic}, keywords = {cognitive radio, generalized likelihood ratio test (GLRT), spectrum sensing}, author = {David Ram{\'\i}rez and Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Javier V{\'\i}a and Ignacio Santamar{\'\i}a} } @article {649, title = {Multiantenna Spectrum Sensing Exploiting Spectral a priori Information}, journal = {IEEE Trans. on Wireless Communications}, volume = {10}, year = {2011}, month = {12/2011}, pages = {4345 - 4355}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/TWC.2011.101211.110665}, author = {Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Josep Sala} } @conference {Pineiro-SPIE2011, title = {A new method for perspective correction of document images}, booktitle = {Document Recognition and Retrieval}, series = {Proc. of SPIE}, volume = {7874}, year = {2011}, month = {January}, pages = {787410}, publisher = {SPIE}, organization = {SPIE}, address = {San Francisco, CA}, keywords = {Document image, perspective distortion correction, watermarking}, author = {Jos{\'e} Rodr{\'\i}guez-Pi{\~n}eiro and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Alberto Malvido} } @conference {671, title = {Prediction based resource allocation in OFDMA}, booktitle = {Information Sciences and Systems (CISS), 2011 45th Annual Conference on}, year = {2011}, month = {march}, pages = {1 -4}, keywords = {empirical characterization, frequency division multiple access, low-complexity channel predictor, mobile radio, mobile stations, mobile wireless channels, OFDM modulation, OFDMA downlink, orthogonal frequency division multiple access downlink, perfect channel state information, prediction error characterization, prediction-based RA strategies, prediction-based resource allocation algorithm, wireless channels}, doi = {10.1109/CISS.2011.5766224}, author = {Schmidt, J.F. and Cousseau, J.E. and Wichman, R. and Werner, S.} } @conference {658, title = {Prefilter Design for Forensic Resampling Estimation}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2011}, month = {12/2011}, pages = {1-6}, publisher = {IEEE}, organization = {IEEE}, address = {Foz do Igua{\c c}u, Brazil}, abstract = {

Starting from a theoretical analysis of the resampling estimation problem for image tampering detection, this work presents a study, based on cyclostationarity theory, about the use of prefilters to improve the estimation accuracy of the resampling factor. Considering the methods that perform the estimation by analyzing the spectrum of the covariance of a resampled region, we propose an analytical framework that allows the definition of a cost function that measures the degree of detectability of the spectral peaks. Based on this measure, the design of the optimum prefilters for a particular resampling factor can be solved numerically. Experimental results validate the developed analysis and illustrate the enhancement of the performance in a real scenario.

}, doi = {10.1109/WIFS.2011.6123133}, author = {David V{\'a}zquez-Pad{\'\i}n and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {troncosoTIFS2011, title = {Secure Adaptive Filtering}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {6}, number = {2}, year = {2011}, month = {June}, pages = {469 -485}, keywords = {adaptive signal processing, computational complexity, cryptography, digital data protection, encrypted domain, homomorphic encryption systems, least mean squares algorithm, least mean squares methods, privacy, secure adaptive filtering, security, signal privacy preservation, SPED techniques, watermarking}, doi = {10.1109/TIFS.2011.2109385}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {NaBIC2011, title = {Solving the Node Localization Problem in WSNs by a Two-objective Evolutionary Algorithm and Gradient Descent}, booktitle = {the 3-th IEEE World Congress on Nature and Biologically Inspired Computing (NaBIC 2011)}, year = {2011}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce and Francesco Marcelloni} } @article {VazquezValcarceTSP11, title = {Spectrum Sensing Exploiting Guard Bands and Weak Channels}, journal = {IEEE Trans. on Signal Processing}, volume = {59}, number = {12}, year = {2011}, month = {12/2011}, pages = {6045-6057}, abstract = {
We address the problem of primary user detection\ in Cognitive Radio from a wideband signal comprising multiple\ primary channels, exploiting a priori knowledge about the\ primary network: channelization and spectral shape of primary\ transmissions. Using this second-order statistical information, a\ multichannel Gaussian model is formulated. In order to obtain\ a Generalized Likelihood Ratio Test, we first address Maximum\ Likelihood (ML) estimation of the power levels at the different\ channels, as well as of the noise variance. The ML conditions\ suggest a suboptimal closed-form estimate, which takes the form\ of a constrained Least Squares estimator whose asymptotic\ efficiency is shown for flat bandpass spectra in white noise, a\ case of practical importance. The resulting detectors exploit those\ frequency bins corresponding to guard bands and to primary\ channels perceived as weak to improve noise variance estimation.\ Analytical expressions for the probabilities of detection and false\ alarm are presented. Performance is evaluated via simulations\ in the setting of a terrestrial TV primary network with realistic\ channelization parameters.
}, keywords = {cognitive radio, dynacs, spectrum sensing}, doi = {10.1109/TSP.2011.2167615}, author = {Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce} } @conference {ISDA2011_1, title = {A study on the Application of Different Two-objective Evolutionary Algorithms to the Node Localization Problem in Wireless Sensor Networks}, booktitle = {IEEE International Conference on Intelligent Systems Design and Applications (ISDA)}, year = {2011}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce and Francesco Marcelloni} } @article {Vecchio2011, title = {A two-objective evolutionary approach based on topological constraints for node localization in wireless sensor networks}, journal = {Applied Soft Computing}, volume = {12}, year = {2011}, month = {07/2012}, pages = {1891-1901}, abstract = {

To know the location of nodes plays an important role in many current and envisioned wireless sensor network applications. In this framework, we consider the problem of estimating the locations of all the nodes of a network, based on noisy distance measurements for those pairs of nodes in range of each other, and on a small fraction of anchor nodes whose actual positions are known a priori. The methods proposed so far in the literature for tackling this non-convex problem do not generally provide accurate estimates. The difficulty of the localization task is exacerbated by the fact that the network is not generally uniquely localizable when its connectivity is not sufficiently high. In order to alleviate this drawback, we propose a two-objective evolutionary algorithm which takes concurrently into account during the evolutionary process both the localization accuracy and certain topological constraints induced by connectivity considerations. The proposed method is tested with different network configurations and sensor setups, and compared in terms of normalized localization error with another metaheuristic approach, namely SAL, based on simulated annealing. The results show that, in all the experiments, our approach achieves considerable accuracies and significantly outperforms SAL, thus manifesting its effectiveness and stability.

}, keywords = {dynacs, Multiobjective evolutionary algorithms, Node localization, Range measurements, Stochastic optimization, wsn}, issn = {1568-4946}, doi = {10.1016/j.asoc.2011.03.012}, author = {Massimo Vecchio and R. L{\'o}pez-Valcarce and Francesco Marcelloni} } @conference {Comesana-ICASSP2011, title = {Weber{\textquoteright}s law-based side-informed data hiding}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2011}, month = {May}, pages = {1840-1843}, address = {Prague, Czech Republic}, keywords = {data hiding, Logarithmic watermarking, Perceptually shaped watermarks, watermarking, Weber{\textquoteright}s law}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {pcomesan-iwdw11, title = {Witsenhausen{\textquoteright}s counterexample and its links with multimedia security problems}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, year = {2011}, month = {October}, address = {Atlantic City, USA}, keywords = {control, Multimedia security, Witsenhausen{\textquoteright}s counterexample}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Chaouki T. Abdallah} } @article {Comesana-TIT2010, title = {Asymptotically Optimum Universal Watermark Embedding and Detection in the High-SNR Regime}, journal = {IEEE Transactions on Information Theory}, volume = {56}, number = {6}, year = {2010}, month = {June}, pages = {2804-2815}, keywords = {hypothesis testing, Neyman-Pearson, watermark detection, watermark embedding, watermarking}, author = {Pedro Comesa{\~n}a and Neri Merhav and Mauro Barni} } @article {Alvarez-Diaz-SigPro-10, title = {Blind l_1-Norm-Based Phase Estimation for Cross-QAM Robust to Finite Precision Effects}, journal = {Signal Processing}, volume = {90}, year = {2010}, note = {Accepted for publication}, month = {11/2010}, pages = {2934-2948}, keywords = {blind phase estimation, carrier offset, cross-QAM constellations, fixed point implementation}, author = {Marcos {\'A}lvarez-D{\'\i}az and R. L{\'o}pez-Valcarce and Iago G{\'o}mez-Alonso} } @article {KsibiCherif10, title = {Closed-form real single-tone frequency estimator based on a normalized IIR notch filter}, journal = {Signal Processing}, volume = {90}, number = {6}, year = {2010}, month = {June}, pages = {1905-1915}, keywords = {Frequency estimation, IIR notchfilter, Least squares, Real sinusoid, RPHD estimator}, author = {R. Elasmi-Ksibi and S. Cherif and R. L{\'o}pez-Valcarce and H. Besbes} } @conference {troncosoCISE10, title = {CryptoDSPs for Cloud Privacy}, booktitle = {International Workshop on Cloud Information System Engineering (CISE)}, series = {LNCS}, volume = {6724}, year = {2010}, month = {December}, address = {Hong Kong, China}, keywords = {cloud, privacy, security, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @mastersthesis {799, title = {Design of Nonlinear Precoding and Estimation Schemes for Advanced Communication Systems}, volume = {Ph.D.}, year = {2010}, month = {04/2010}, type = {Ph.D. thesis}, keywords = {adaptive signal processing, satcom}, author = {Marcos {\'A}lvarez-D{\'\i}az} } @article {JayaweeraVazquezMosquera2010, title = {Dynamic spectrum leasing (DSL): A new paradigm for spectrum sharing in cognitive radio networks}, journal = {IEEE Transactions on Vehicular Technology}, volume = {59}, number = {5}, year = {2010}, pages = {2328-2339}, keywords = {cognitive radio, DSL, dynamic spectrum access, dynamic spectrum leasing, dynamic spectrum sharing, game theory, power control}, author = {Sudhaman K. Jayaweera and Gonzalo V{\'a}zquez-Vilar and C. Mosquera} } @conference {ElHowayekJayaweeraHakimVazquezMosquera2010, title = {Dynamic Spectrum Leasing (DSL) in Dynamic Channels}, booktitle = {ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP)}, year = {2010}, month = {May 23}, address = {Cape Town, South Africa}, keywords = {cognitive radio, DSL, dynamic spectrum leasing, game theory, Rayleigh fading, time-varying channels, time-varying secondary system}, author = {Georges El-Howayek and Sudhaman K. Jayaweera and Kamrul Hakim and Gonzalo V{\'a}zquez-Vilar and C. Mosquera} } @article {HakimJayaweeraHowayekMosqueraTWC2010, title = {Efficient Dynamic Spectrum Sharing in Cognitive Radio Networks: Centralized Dynamic Spectrum Leasing (C-DSL)}, journal = {IEEE Transactions on Wireless Communications}, volume = {9}, number = {9}, year = {2010}, pages = {2956-2967}, author = {Kamrul Hakim and Sudhaman K. Jayaweera and Georges El-Howayek and C. Mosquera} } @conference {SalemValcarce10, title = {A finite interval constant modulus criterion for multicarrier channel shortening}, booktitle = {European Wireless}, year = {2010}, address = {Lucca, Italy}, author = {E. Ben Salem and R. L{\'o}pez-Valcarce and H. Besbes and S. Cherif} } @article {KsibiBesbesSP10, title = {Frequency estimation of real-valued single-tone in colored noise using multiple autocorrelation lags}, journal = {Signal Processing}, volume = {90}, number = {7}, year = {2010}, month = {July}, pages = {2303-2307}, keywords = {Autocorrelation, Frequency estimation, Single sinusoid}, author = {R. Elasmi-Ksibi and H. Besbes and R. L{\'o}pez-Valcarce and S. Cherif} } @article {MosqueraValcarceJayaweera2010, title = {Joint NDA Estimation of Carrier Frequency/Phase and SNR for Linearly Modulated Signals}, journal = {IEEE Signal Processing Letters}, volume = {17}, number = {5}, year = {2010}, month = {05/2010}, pages = {517-520}, keywords = {Carrier offset estimation, Cramer-Rao lower bound, expectation-maximization algorithm, SNR estimation}, author = {Wilfried Gappmair and R. L{\'o}pez-Valcarce and C. Mosquera} } @article {ShebaroDRFWS2010, title = {Leaving Timing Channel Fingerprints in Hidden Service Log Files}, journal = {Digital Investigation}, year = {2010}, note = {doi:10.1016/j.diin.2010.05.013}, keywords = {data-hiding, fingerprints, hidden services, timestamps, timing channel, tor network, watermarking}, author = {Bilal Shebaro and Fernando P{\'e}rez-Gonz{\'a}lez and Jedidiah R. Crandall} } @conference {ShebaroElsevier2010, title = {Leaving Timing Channel Fingerprints in Hidden Service Log Files}, booktitle = {Digital Forensic Research Workshop Annual Conference (DFRWS)}, year = {2010}, month = {August}, address = {Portland, Oregon}, keywords = {data hiding, fingerprints, hidden services, timestamps, timing channel, tor network, watermarking}, author = {Bilal Shebaro and Fernando P{\'e}rez-Gonz{\'a}lez and Jedidiah R. Crandall} } @conference {RamirezValcarceICASSP10, title = {Multiantenna spectrum sensing: detection of spatial correlation among time-series with unknown spectra}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2010}, address = {Dallas, TX}, keywords = {cognitive radio, coherence spectrum, generalized likelihood ratio test, Hadamard ratio, multiple-channel signal detection}, author = {David Ram{\'\i}rez and Javier V{\'\i}a and Ignacio Santamar{\'\i}a and R. L{\'o}pez-Valcarce and L. L. Scharf} } @conference {ValcarceVazquez10, title = {Multiantenna spectrum sensing for Cognitive Radio: overcoming noise uncertainty}, booktitle = {International Workshop on Cognitive Information Processing (CIP)}, year = {2010}, address = {Elba Island, Italy}, author = {R. L{\'o}pez-Valcarce and Gonzalo V{\'a}zquez-Vilar and Josep Sala} } @conference {troncosoicassp09, title = {A new model for Gabor Coefficients{\textquoteright} Magnitude in Face Recognition}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2010}, month = {March}, publisher = {IEEE}, organization = {IEEE}, address = {Dallas, USA}, keywords = {Gabor coefficients, generalized Gaussian, Magnitude, Quantization, Statistical Model, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Daniel Gonz{\'a}lez-Jim{\'e}nez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {PaperASMS2010, title = {Performance Analysis of Distributed Tracking with Consensus on Noisy Time-Varying Graphs}, booktitle = {Advanced Satellite Multimedia Systems Conference (ASMA)}, year = {2010}, pages = {395-400}, address = {Cagliari, Italy}, keywords = {connectivity graph, distributed local Kalman filtering, distributed tracking, distributed tracking with consensus, graph topology, network theory (graphs), noisy communications links, noisy time-varying graphs, performance analysis, telecommunication links, telecommunication network topology, time-varying network topology, time-varying systems}, author = {Yongxiang Ruan and Sudhaman K. Jayaweera and C. Mosquera} } @article {GonzaloCarlosSudharman2010, title = {Primary User Enters the Game: Performance of Dynamic Spectrum Leasing in Cognitive Radio Networks}, journal = {IEEE Transactions on Wireless Communications}, year = {2010}, author = {Gonzalo V{\'a}zquez-Vilar and C. Mosquera and Sudhaman K. Jayaweera} } @conference {dalgaard-icip10, title = {On the Role of Differentiation for Resampling Detection}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2010}, month = {September}, publisher = {IEEE}, organization = {IEEE}, address = {Hong Kong, China}, keywords = {cyclostationarity, Image forensics, interpolation, prefiltering, resampling detection, watermarking}, author = {Nahuel Dalgaard and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {troncosovph10, title = {Secure and Private Medical Clouds using Encrypted Processing}, booktitle = {Virtual Physiological Human (VPH)}, year = {2010}, month = {October}, address = {Brussels, Belgium}, keywords = {cloud, privacy, security, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {Alvarez-Diaz-TSP-10, title = {SNR Estimation for Multilevel Constellations Using Higher-Order Moments}, journal = {IEEE Transactions on Signal Processing}, volume = {58}, number = {3, Part 2}, year = {2010}, month = {March}, pages = {1515{\textendash}1526}, keywords = {Blind estimation, higher-order statistics, Moments-based estimation, SNR estimation}, author = {Marcos {\'A}lvarez-D{\'\i}az and R. L{\'o}pez-Valcarce and C. Mosquera} } @article {MosqueraValcarceJayaweera2009, title = {Stepsize Sequence Design for Distributed Average Consensus}, journal = {IEEE Signal Processing Letters}, volume = {17}, number = {2}, year = {2010}, month = {Feb}, pages = {169-172}, author = {C. Mosquera and R. L{\'o}pez-Valcarce and Sudhaman K. Jayaweera} } @conference {dvazquez-icip10, title = {Two-dimensional Statistical Test for the Presence of Almost Cyclostationarity on Images}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2010}, month = {09/2010}, pages = {1745-1748}, publisher = {IEEE}, organization = {IEEE}, address = {Hong Kong, China}, abstract = {

In this work, we study the presence of almost cyclostationary fields in images for the detection and estimation of digital forgeries. The almost periodically correlated fields in the two-dimensional space are introduced by the necessary interpolation operation associated with the applied spatial transformation. In this theoretical context, we extend a statistical time-domain test for presence of cyclostationarity to the two-dimensional space. The proposed method allows us to estimate the scaling factor and the rotation angle of resized and rotated images, respectively. Examples of the output of our method are shown and comparative results are presented to evaluate the performance of the two-dimensional extension.

}, keywords = {cyclostationarity, Image forensics, interpolation, resampling factor estimation, spatial transformation, watermarking}, doi = {10.1109/ICIP.2010.5652513}, author = {David V{\'a}zquez-Pad{\'\i}n and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {VazquezValcarceMosqueraPrelcic2010, title = {Wideband Spectral Estimation from Compressed Measurements Exploiting Spectral a priori Information in Cognitive Radio Systems}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2010}, month = {March 14-19}, address = {Dallas, U.S.A.}, keywords = {cognitive radio, compressive sampling, Spectral estimation}, author = {Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and C. Mosquera and Nuria Gonz{\'a}lez-Prelcic} } @conference {Freire2009:WIFS, title = {Blind decoder for binary probabilistic traitor tracing codes}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2009}, month = {6-9 December}, pages = {56-60}, address = {London, UK}, keywords = {collusion, information theory, Tardos, Traitor tracing, watermarking}, author = {Luis P{\'e}rez-Freire and Teddy Furon} } @article {ValcarceMosqueraTCOM08, title = {Cramer-Rao Lower Bound and EM Algorithm for Envelope-Based SNR Estimation of Nonconstant Modulus Constellations}, journal = {IEEE Transactions on Communications}, volume = {57}, number = {6}, year = {2009}, month = {june}, pages = {1622 - 1627}, author = {Wilfried Gappmair and R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {JayaweeraMosqueraAsilomar2009, title = {A Dynamic Spectrum Leasing (DSL) Framework for Spectrum Sharing in Cognitive Radio Networks}, booktitle = {Asilomar Conference on Signals, Systems and Computers}, year = {2009}, author = {Sudhaman K. Jayaweera and C. Mosquera} } @conference {Furon2009:EM, title = {EM decoding of Tardos traitor tracing codes}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2009}, month = {7-8 September}, address = {Princeton, NJ, USA}, keywords = {collusion channel, Expectation-Maximization, iterative decoding, Tardos code, Traitor tracing, watermarking}, author = {Teddy Furon and Luis P{\'e}rez-Freire} } @conference {IH09, title = {Estimating the minimal length of Tardos code}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, year = {2009}, month = {7-10 June}, address = {Darmstadt, Germany}, keywords = {Fingerprinting, Rare event, Tardos code, Traitor tracing, watermarking}, author = {Teddy Furon and Luis P{\'e}rez-Freire and Arnaud Guyader and Fr{\'e}d{\'e}ric C{\'e}rou} } @conference {wifs09, title = {AN EXTENDED ANALYSIS OF DISCRETE FOURIER TRANFORM - RATIONAL DITHER MODULATION FOR NON-WHITE HOSTS}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2009}, month = {December}, publisher = {IEEE}, organization = {IEEE}, address = {London, U.K.}, keywords = {data hiding, dither modulation, filtering, non-white Gaussian hosts, watermarking}, author = {Scagliola, Michele and Fernando P{\'e}rez-Gonz{\'a}lez and Guccione, Pietro} } @article {scagliojis09, title = {High-rate data-hiding robust to linear filtering for colored hosts}, journal = {EURASIP Journal on Information Security}, year = {2009}, keywords = {data-hiding, rational dither modulation, watermarking}, author = {Scagliola, Michele and Fernando P{\'e}rez-Gonz{\'a}lez and Guccione, Pietro} } @conference {spieei09, title = {Model-based steganalysis using invariant features}, booktitle = {Media Forensics and Security}, year = {2009}, month = {January}, address = {San Jose, CA, U.S.A.}, keywords = {Invariant features, Model-based, Steganalysis}, author = {Tu-Thach Quach and Fernando P{\'e}rez-Gonz{\'a}lez and Gregory L. Heileman} } @conference {dgonzalez-icip09, title = {Modeling Magnitudes of Gabor Coefficients: The \β-Rayleigh Distribution}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2009}, month = {November}, publisher = {IEEE}, organization = {IEEE}, address = {Cairo, Egypt}, keywords = {Gabor, generalized Gaussian, Rayleigh, watermarking}, author = {Daniel Gonz{\'a}lez-Jim{\'e}nez and Enrique Argones-R{\'u}a and Fernando P{\'e}rez-Gonz{\'a}lez and Jos{\'e} Luis Alba-Castro} } @conference {ValcarceVazquezAlvarez2009, title = {Multiantenna detection of multicarrier primary signals exploiting spectral a priori information}, booktitle = {International Conference on Cognitive Radio Oriented Wireless Networks and Communications (Crowncom)}, year = {2009}, month = {June 22-24}, address = {Hannover, Germany}, author = {R. L{\'o}pez-Valcarce and Gonzalo V{\'a}zquez-Vilar and Marcos {\'A}lvarez-D{\'\i}az} } @conference {dominguezicip09, title = {Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2009}, month = {November}, address = {Cairo, Egypt}, keywords = {cryptography, error statistics, false negative probabilities, false positive probabilities, Fridrich-Goljan self-embedding authentication method, hash bit errors, image authentication method, image coding, message authentication, performance analysis, robust hashing, watermarking}, author = {Gabriel Dom{\'\i}nguez-Conde and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {domingueztifs09, title = {Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {4}, number = {3}, year = {2009}, month = {Sept.}, pages = {570-577}, keywords = {cryptography, error statistics, false negative probabilities, false positive probabilities, Fridrich-Goljan self-embedding authentication method, hash bit errors, image authentication method, image coding, message authentication, performance analysis, robust hashing, watermarking}, author = {Gabriel Dom{\'\i}nguez-Conde and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {speed09, title = {Secure Direct and Iterative Protocols for Solving Systems of Linear Equations}, booktitle = {Signal Processing in the Encrypted Domain (SPEED) Workshop}, year = {2009}, month = {September}, pages = {122{\textendash}141}, address = {Lausanne, Switzerland}, keywords = {iterative protocol, privacy, security, systems of linear equations, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {icip09, title = {Skewed Log-Stable model for natural images pixel block-variance}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2009}, month = {November}, publisher = {IEEE}, organization = {IEEE}, address = {Cairo, Egypt}, keywords = {Doubly stochastic model, Image block-variance, Log-stable distribution, Lognormal distribution, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {tifs08ss-security, title = {Spread spectrum watermarking security}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {4}, number = {1}, year = {2009}, month = {March}, pages = {2-24}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {paperBroadbandWorkshop2009, title = {A Unified Framework for Dynamic Spectrum Leasing (DSL) in Cognitive Radios}, booktitle = {IEEE Broadband Wireless Access Workshop}, year = {2009}, note = {colocated with Globecom}, author = {Sudhaman K. Jayaweera and Kamrul Hakim and C. Mosquera} } @conference {drm09, title = {Videosurveillance and privacy: covering the two sides of the mirror with DRM}, booktitle = {ACM Workshop on Digital Rights Management (DRM)}, year = {2009}, month = {November}, publisher = {ACM}, organization = {ACM}, address = {Chicago, IL, USA}, keywords = {access control, privacy, rights management, security, videosurveillance, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ValcarceVazquez2009, title = {Wideband Spectrum Sensing in Cognitive Radio: Joint Estimation of Noise Variance and Multiple Signal Levels}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2009}, month = {June 21-24}, address = {Perugia, Italy}, author = {R. L{\'o}pez-Valcarce and Gonzalo V{\'a}zquez-Vilar} } @conference {Furon2009:WCA, title = {Worst case attacks against binary probabilistic traitor tracing codes}, booktitle = {IEEE International Workshop on Information Forensics and Security (WIFS)}, year = {2009}, month = {6-9 December}, pages = {46-50}, address = {London, UK}, keywords = {collusion, information theory, Tardos, Traitor tracing, watermarking}, author = {Teddy Furon and Luis P{\'e}rez-Freire} } @conference {spie08, title = {Asymptotically optimum embedding strategy for one-bit watermarking under Gaussian attacks}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {6819}, year = {2008}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, CA, USA}, author = {Pedro Comesa{\~n}a and Neri Merhav and Mauro Barni}, editor = {Edward J. Delp and Ping W. Wong and Jana Dittmann and Nasir D. Memon} } @mastersthesis {Freire08thesis, title = {Digital Watermarking Security}, year = {2008}, school = {University of Vigo, Spain}, type = {phd}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire} } @conference {ih08, title = {Distortion Optimization of Model-Based Secure Embedding Schemes for Data-Hiding}, booktitle = {International Workshop on Information Hiding (IH)}, year = {2008}, month = {May}, address = {Santa Barbara, CA, U.S.A.}, keywords = {data hiding, Distortion Optimization, Secure Embedding}, author = {Benjamin Mathon and Patrick Bas and Fran{\c c}ois Cayre and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Mosquera08a, title = {Distributed Estimation: Do Not Trust Gossips}, booktitle = {Sensor, Signal and Information Processing (SenSIP) Workshop}, year = {2008}, address = {Sedona (Arizona)}, keywords = {distributed estimation, sensor network}, author = {C. Mosquera and Sudhaman K. Jayaweera} } @conference {Mosquera08c, title = {Distributed Estimation with Noisy Exchanges}, booktitle = {IEEE International Workshop on Signal Processing Advances in Wireless Communications}, year = {2008}, address = {Recife, Brazil}, keywords = {distributed estimation, sensor network}, author = {C. Mosquera and R. L{\'o}pez-Valcarce and Sudhaman K. Jayaweera} } @article {MosqueraSPL08, title = {Distributed Sequential Estimation with Noisy, Correlated Observations}, journal = {IEEE Signal Processing Letters}, volume = {15}, year = {2008}, author = {Sudhaman K. Jayaweera and C. Mosquera} } @conference {Mosquera08b, title = {Entangled Kalman Filters for Cooperative Estimation}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop}, year = {2008}, address = {Darmstadt (Germany)}, keywords = {distributed estimation, sensor network}, author = {C. Mosquera and Sudhaman K. Jayaweera} } @conference {ElasmiEUSIPCO08, title = {A family of frequency estimators using higher-order sample covariance lags for real sinusoid detection}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2008}, month = {August}, address = {Lausanne, Switzerland}, keywords = {Frequency estimator, Sinusoid detection}, author = {R. Elasmi-Ksibi and R. L{\'o}pez-Valcarce and H. Besbes and S. Cherif and M. Jaidane} } @conference {SalemEUSIPCO08, title = {Lattice implementation of Sum-squared Auto-correlation Minimization (SAM) channel shortener}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2008}, month = {August}, address = {Lausanne, Switzerland}, keywords = {Blind Adaptation, Lattice, SAM}, author = {E. Ben Salem and R. L{\'o}pez-Valcarce and S. Cherif and H. Besbes} } @conference {ValcarceMosquera08a, title = {Maximum Likelihood SNR Estimation for Asynchronously Oversampled OFDM Signals}, booktitle = {IEEE International Workshop on Signal Processing Advances in Wireless Communications}, year = {2008}, address = {Recife, Brazil}, keywords = {estimation, ML, OFDM, SNR}, author = {R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {GappmairCNSDSP08, title = {ML and EM Algorithm for non-data-aided SNR Estimation of Linearly Modulated Signals}, booktitle = {International Symposium on Communication Systems, Networks and Signal Processing (CNSDSP)}, year = {2008}, pages = {530-534}, keywords = {EM, ML, SNR estimation}, author = {Wilfried Gappmair and R. L{\'o}pez-Valcarce and C. Mosquera} } @article {MosqueraTSP07, title = {Non-Data-Aided Symbol Rate Estimation of Linearly Modulated Signals}, journal = {IEEE Transactions on Signal Processing}, year = {2008}, month = {February}, author = {C. Mosquera and Sandro Scalise and R. L{\'o}pez-Valcarce} } @article {PerezMosqueraTIFS08, title = {Quantization-Based Data-Hiding Robust to Linear Time-Invariant Filtering}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {3}, number = {2}, year = {2008}, month = {June}, pages = {137-152}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera} } @article {VilaForcen08TDHMS, title = {Quantization-Based Methods: Additive Attacks Performance Analysis}, journal = {Transactions on Data Hiding and Multimedia Security III}, volume = {4920}, year = {2008}, pages = {70-90}, keywords = {data-hiding, watermarking}, author = {Jose Emilio Vila-Forc{\'e}n and Sviatoslav Voloshynovskiy and Oleksiy Koval and Fernando P{\'e}rez-Gonz{\'a}lez and Thierry Pun} } @article {tifs08dcdm, title = {Security of lattice-based data hiding against the Watermarked Only Attack}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {3}, number = {4}, year = {2008}, month = {December}, pages = {593-610}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ASMS08, title = {SNR Estimation with Heterogeneous Frames}, booktitle = {Advanced Satellite Mobile Systems Conference}, year = {2008}, month = {August 26-28}, address = {Bologna, Italy}, author = {Marcos {\'A}lvarez-D{\'\i}az and R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {icip07benford, title = {Benford{\textquoteright}s Law in Image Processing}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2007}, month = {September}, address = {San Antonio, TX, USA}, keywords = {benford, benford{\textquoteright}s-law}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Gregory L. Heileman and Chaouki T. Abdallah} } @article {jis07bows, title = {Breaking the BOWS Watermarking System: Key Guessing and Sensitivity Attacks}, journal = {EURASIP Journal on Information Security}, volume = {2007}, number = {2}, year = {2007}, note = {Vol 2007, Article ID 25308, 8 pages. doi:10.1155/2007/25308. Source code available here}, month = {February}, keywords = {data-hiding, oracle, sensitivity, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {acm07pedro, title = {On the capacity of stegosystems}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2007}, month = {September}, pages = {1261-1264}, address = {Dallas, TX, USA}, keywords = {data-hiding, steganography, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @book {Artes07book, title = {Comunicaciones Digitales}, year = {2007}, month = {May}, publisher = {Pearson - Prentice Hall}, organization = {Pearson - Prentice Hall}, author = {Antonio Art{\'e}s-Rodr{\'\i}guez and Fernando P{\'e}rez-Gonz{\'a}lez and Jes{\'u}s Cid-Sueiro and R. L{\'o}pez-Valcarce and C. Mosquera and Fernando P{\'e}rez-Cruz} } @inbook {Mosquera07sat, title = {Digital Satellite Communications}, year = {2007}, publisher = {Springer}, organization = {Springer}, chapter = {Parameter Estimation and Synchronization}, author = {C. Mosquera and M. L. Boucheret and M. Bousquet and S. Cioni and Wilfried Gappmair and R. Pedone and Sandro Scalise and P. Skoutaridis and M. Villanti} } @inbook {Pedone07sat, title = {Digital Satellite Communications}, year = {2007}, publisher = {Springer}, organization = {Springer}, chapter = {Theoretical Background}, author = {R. Pedone and G. Albertazzi and P.T. Mathiopoulos and C. Mosquera and N. Sagias and M. Villanti} } @inbook {Chap8_Book_Corazza07, title = {Digital Satellite Communications}, year = {2007}, month = {April}, pages = {-}, publisher = {Springer}, organization = {Springer}, chapter = {Distortion Countermeasures}, address = {New York}, author = {A. A. Rontogiannis and Marcos {\'A}lvarez-D{\'\i}az and M. Casadei and V. Dalakas and A. Duverdier and F. J. Gonz{\'a}lez-Serrano and M. Iubatti and T. Javornik and L. Lapierre and Neri, Massimo and P. Salmi} } @inbook {Chap4_Book_Corazza07, title = {Digital Satellite Communications}, year = {2007}, month = {April}, pages = {-}, publisher = {Springer}, organization = {Springer}, chapter = {Satellite Channel Impairments}, address = {New York}, author = {Sandro Scalise and L. Castanet and M. Luglio and Neri, Massimo and Marcos {\'A}lvarez-D{\'\i}az and J. Bito and M. Bousquet and I. Frigyes and P. Horvath and Axel Jahn and M. Krejcarek and J. Lemorton and S. Morosi and M. A. V{\'a}zquez-Castro} } @conference {wacha07, title = {Disclosing secrets in watermarking and data hiding}, booktitle = {Third Wavila Challenge (WaCha)}, series = {ECRYPT proceedings series from the Otto-von-Guericke University, Magdeburg, Germany}, year = {2007}, month = {14 June}, address = {Saint-Malo, France}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {spie07:dist-measures, title = {On Distortion Measures Associated to Random Desynchronization Attacks}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, desynchronization, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @conference {iwdw07pedro, title = {Dither modulation in the logarithmic domain}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, year = {2007}, month = {December}, pages = {1261-1264}, address = {Guangzhou, China}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {spie07:zero-knowledge, title = {Efficient Non-Interactive Zero-Knowledge Watermark Detector Robust to Sensitivity Attacks}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, sensitivity, watermarking, zero-knowledge}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @article {zkwd-eurasipjis-sped07, title = {Efficient Zero-Knowledge Watermark Detection with Improved Robustness to Sensitivity Attacks}, journal = {EURASIP Journal on Information Security}, year = {2007}, note = {Special Issue on Signal Processing in the Encrypted Domain}, keywords = {data-hiding, sensitivity, watermarking, zero-knowledge}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ih07, title = {Exploiting security holes in lattice data hiding}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, year = {2007}, month = {11-13 June}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, address = {Saint-Malo, France}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {672, title = {Fast-fading channel estimator using DCT and simplified kalman filter}, booktitle = {Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on}, year = {2007}, month = {june}, pages = {1 -5}, keywords = {band-pass filters, basis function approximations, channel coefficient, channel Doppler spectrum, channel estimation, channel estimator, channel variations, decoupled parameters, discrete cosine transform, discrete cosine transforms, Doppler effect, fading channels, fast-fading channel, Kalman filter, Kalman filters, low complexity estimator, narrow-band filters, passband filters, training symbols}, doi = {10.1109/SPAWC.2007.4401355}, author = {Schmidt, J.F. and Cousseau, J.E. and Wichman, R. and Gregorio, F.H.} } @conference {ecc07benford, title = {A Generalization of Benford{\textquoteright}s Law and Its Application to Images}, booktitle = {European Control Conference (ECC)}, year = {2007}, month = {July}, address = {Kos, Greece}, keywords = {benford, benford{\textquoteright}s-law}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Gregory L. Heileman and Chaouki T. Abdallah} } @conference {ValcarceSPAWC07, title = {Iterative Envelope-Based SNR Estimation for Non-Constant Modulus Constellations}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2007}, keywords = {EM, SNR, synchronization}, author = {R. L{\'o}pez-Valcarce and C. Mosquera and Wilfried Gappmair} } @conference {icip07dani, title = {Modeling Gabor coefficients via Generalized Gaussian Distributions for face recognition}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2007}, month = {September}, pages = {1261-1264}, address = {San Antonio, TX, USA}, keywords = {biometrics, face-recognition}, author = {Daniel Gonz{\'a}lez-Jim{\'e}nez and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Jos{\'e} Luis Alba-Castro} } @conference {IWSSC07, title = {Non-Linear Interference Mitigation for Broadband Multimedia Satellite Systems}, booktitle = {International Workshop on Satellite and Space Communications (IWSSC)}, year = {2007}, month = {September 13-14}, address = {Salzburg, Austria}, author = {Marcos {\'A}lvarez-D{\'\i}az and Nicolas Courville and C. Mosquera and Gianluigi Liva and Giovanni Emanuele Corazza} } @conference {spie07:auth, title = {A Novel Interpretation of Content Authentication}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {authentication, data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @booklet {Freire07report, title = {Practical estimators of the secret spreading vector for Improved Spread Spectrum modulations. Statistical analysis and results}, year = {2007}, month = {November}, publisher = {Signal Theory and Communications Department, University of Vigo, Spain}, type = {Internal report}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire} } @conference {troncosoccs07, title = {Privacy Preserving Error Resilient DNA Searching through Oblivious Automata}, booktitle = {ACM Conference on Computer and Communications Security (CCS)}, year = {2007}, month = {Oct 29{\textendash}Nov 2}, pages = {519{\textendash}528}, publisher = {ACM Press}, organization = {ACM Press}, address = {Alexandria, Virginia, USA}, keywords = {DNA, privacy, security, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Stefan Katzenbeisser and Mehmet Celik} } @conference {Reproducible07, title = {Putting Reproducible Signal Processing into Practice: A Case Study in Watermarking}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {4}, year = {2007}, month = {April}, pages = {1261-1264}, address = {Honolulu, HW, USA}, keywords = {data-hiding, watermarking}, author = {Mauro Barni and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a and Guido Bartoli} } @conference {MosqueraIWSSC07, title = {Satellite Communications: Research Trends and Open Issues}, booktitle = {International Workshop on Satellite and Space Communications (IWSSC)}, year = {2007}, keywords = {satellite communications}, author = {Alessandro Vanelli-Coralli and Giovanni Emanuele Corazza and G.K. Karagiannidis and P.T. Mathiopoulos and D.S. Michalopoulos and C. Mosquera and S. Papaharalabos and Sandro Scalise} } @conference {mmsec07-spedpoint, title = {A Secure Multidimensional Point Inclusion Protocol}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2007}, month = {September}, pages = {109{\textendash}120}, address = {Dallas, Texas, USA}, keywords = {multiparty computation, privacy, security, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Stefan Katzenbeisser and Mehmet Celik and Aweke Lemma} } @conference {spie07:security, title = {Security of Spread-Spectrum-Based Data Hiding}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Pierre Moulin and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @article {ValcarceCL07, title = {Sixth-Order Statistics-Based Non-Data-Aided SNR Estimation}, journal = {IEEE Communications Letters}, volume = {11}, number = {4}, year = {2007}, month = {April}, pages = {351-353}, author = {R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {icip07boato, title = {Statistical Analysis of a Linear Algebra Asymmetric Watermarking Scheme}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2007}, month = {September}, pages = {1261-1264}, address = {San Antonio, TX, USA}, keywords = {watermarking}, author = {G. Boato and C. Fontanari and F. G. B. De Natale and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {spie07:bows, title = {Two different approaches for attacking BOWS}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {BOWS, data-hiding, sensitivity, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @conference {icip07pedro, title = {On a watermarking scheme in the logarithmic domain and its perceptual advantages}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2007}, month = {September}, pages = {1261-1264}, address = {San Antonio, TX, USA}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {tifs06SCS, title = {An accurate analysis of scalar quantization-based data-hiding}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {1}, number = {1}, year = {2006}, month = {March}, pages = {80-86}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Sviatoslav Voloshynovskiy} } @conference {acm06:kma, title = {On achievable security levels for lattice data hiding in the Known Message Attack scenario}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2006}, month = {September}, pages = {68-79}, publisher = {ACM}, organization = {ACM}, address = {Geneva, Switzerland}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Teddy Furon} } @conference {uvigo:gainestimation, title = {Analysis of non-data-aided magnitude gain estimators}, booktitle = {International Symposium on Image/Video Communications (ISIVC)}, year = {2006}, address = {Hammamet, Tunisia}, keywords = {Digital Communications, gain estimation, synchronization}, author = {R. L{\'o}pez-Valcarce} } @conference {uvigo:gaussphase, title = {Blind carrier phase estimation for non-equiprobable constellations}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2006}, address = {Cannes, France}, keywords = {Digital Communications, phase estimation, signal shaping, synchronization, Tomlinson-Harashima precoding}, author = {R. L{\'o}pez-Valcarce and C. Mosquera} } @article {pis06:bnsa, title = {Blind Newton Sensitivity Attack}, journal = {IEE Proceedings on Information Security}, volume = {153}, number = {3}, year = {2006}, note = {To appear}, month = {September}, pages = {115-125}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {spie06:sensitivity, title = {The blind Newton senstivity attack}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2006}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @article {tsp05dcdm, title = {On distortion-compensated Dither Modulation data-hiding with repetition coding}, journal = {IEEE Transactions on Signal Processing}, volume = {54}, number = {2}, year = {2006}, month = {February}, pages = {585-600}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado} } @conference {spie05:dftrdm, title = {High-rate quantization data hiding robust to arbitrary linear filtering attacks}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2006}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera and Marcos {\'A}lvarez-D{\'\i}az and Reginald Lagendijk}, editor = {Edward J. Delp and Ping W. Wong} } @article {spl06:cropping, title = {The impact of the cropping attack on scalar STDM data hiding}, journal = {IEEE Signal Processing Letters}, volume = {13}, number = {6}, year = {2006}, note = {To appear}, month = {June}, pages = {353-356}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {abrardo06, title = {Improving the performance of RDM watermarking by means of trellis coded quantisation}, journal = {IEE Proceedings on Information Security}, volume = {153}, number = {3}, year = {2006}, month = {September}, pages = {107-114}, keywords = {data-hiding, watermarking}, author = {Andrea Abrardo and Mauro Barni and Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera} } @conference {malvido06barcodes, title = {A novel model for the print-and-capture channel in 2D bar codes}, booktitle = {International Workshop on Multimedia Content Representation, Classification and Security}, series = {Lecture Notes in Computer Science}, volume = {4105}, year = {2006}, month = {September}, pages = {627-634}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, address = {Istambul, Turkey}, keywords = {bar-codes, visible-encryption}, author = {Alberto Malvido and Fernando P{\'e}rez-Gonz{\'a}lez and Armando Cousi{\~n}o}, editor = {Bilge Gunsel and Anil K. Jain and A. Murat Tekalp and B{\"u}lent Sankur} } @article {oleksiy06, title = {Robustness Improvement of Known-Host-State Watermarking Using Host Statistics}, journal = {Signal Processing}, volume = {86}, number = {5}, year = {2006}, month = {May}, pages = {1076-1088}, keywords = {data-hiding, watermarking}, author = {Oleksiy Koval and Sviatoslav Voloshynovskiy and Jose Emilio Vila-Forc{\'e}n and Fernando P{\'e}rez-Gonz{\'a}lez and Frederic Deguillaume and Thierry Pun} } @article {uvigo:sosblind, title = {Second-order blind algorithms for adaptive recursive linear equalizers: Analysis and lattice implementation}, journal = {International Journal of Adaptive Control and Signal Processing}, volume = {20}, number = {6}, year = {2006}, month = {August}, pages = {265{\textendash}289}, keywords = {adaptive IIR filters, blind equalization, Digital Communications, lattice filters}, author = {R. L{\'o}pez-Valcarce} } @conference {spie06:sme, title = {Secret dither estimation in lattice-quantization data hiding: a set-membership approach}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2006}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a}, editor = {Edward J. Delp and Ping W. Wong} } @article {tifs06security, title = {Security of lattice-based data hiding against the Known Message Attack}, journal = {IEEE Transactions on Information Forensics and Security}, volume = {1}, number = {4}, year = {2006}, month = {December}, pages = {421-439}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Teddy Furon and Pedro Comesa{\~n}a} } @mastersthesis {Comesana06thesis, title = {Side-informed data hiding: robustness and security analysis}, year = {2006}, school = {University of Vigo, Spain}, type = {phd}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a} } @conference {Mosquera06, title = {Symbol-Rate Estimation for DVB-S2 Broadcasting}, booktitle = {International Workshop on Signal Processing for Space Communications (SPSC)}, year = {2006}, keywords = {DVB, symbol rate, synchronization}, author = {C. Mosquera and Sandro Scalise and R. L{\'o}pez-Valcarce} } @conference {uvigo:nlpoly, title = {Toward a theory of multirate nonlinear systems}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2006}, address = {Cannes, France}, keywords = {multirate systems, nonlinear filters, polyphase filters}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {Alvarez06, title = {Trellis Shaping Techniques for Satellite Telecommunication Systems}, booktitle = {International Workshop on Satellite and Space Communications (IWSSC)}, year = {2006}, month = {September}, address = {Legan{\'e}s, Spain}, keywords = {Digital Communications, precoding, satellite communications}, author = {Marcos {\'A}lvarez-D{\'\i}az and Neri, Massimo and C. Mosquera and Giovanni Emanuele Corazza} } @article {uvigo:survey-sec, title = {Watermarking security: a survey}, journal = {Transactions on Data Hiding and Multimedia Security I}, volume = {4300}, year = {2006}, month = {October}, pages = {41-72}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Pedro Comesa{\~n}a and Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {acm06zk, title = {Zero-Knowledge watermark detector robust to sensitivity attacks}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2006}, month = {September}, pages = {97-107}, publisher = {ACM}, organization = {ACM}, address = {Geneva, Switzerland}, keywords = {data-hiding, watermarking, zero-knowledge}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ICSSC{\textquoteright}05, title = {Aeronautical Channel Model for Broadband L-Band Satellite Communication}, booktitle = {AIAA International Communications Satellite Systems Conference (ICSSC)}, year = {2005}, month = {September 25-28}, address = {Rome, Italy}, keywords = {Digital Communications, L-Band, satellite communications}, author = {Madhavendra Richharia and Naveen Kaluvala and Panos Fines and Marcos {\'A}lvarez-D{\'\i}az and Axel Jahn} } @conference {uvigo:firstorder, title = {Analysis of a first-order adaptive recursive predictor}, booktitle = {IEEE Conference on Decision and Control / European Control Conference (CDC/ECC)}, year = {2005}, address = {Seville, Spain}, keywords = {adaptive signal processing, equalization, second-order statistics}, doi = {10.1109/CDC.2005.1582919}, author = {R. L{\'o}pez-Valcarce} } @conference {spie05:dpc, title = {Applying Erez and Ten Brink{\textquoteright}s Dirty Paper Codes to Data-Hiding}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and Frans M. J. Willems}, editor = {Edward J. Delp and Ping W. Wong} } @conference {spie05:security, title = {Detection in quantization-based watermarking: performance and security issues}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @conference {uvigo:diamond, title = {Diamond contour-based phase recovery for (cross-)QAM constellations}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2005}, address = {Bordeaux, France}, keywords = {adaptive signal processing, synchronization}, doi = {10.1109/SSP.2005.1628678}, author = {Marcos {\'A}lvarez-D{\'\i}az and R. L{\'o}pez-Valcarce} } @conference {spie05:rdm, title = {Ensuring Gain Invariance in High-Rate Data-Hiding}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera and Mauro Barni and Andrea Abrardo}, editor = {Edward J. Delp and Ping W. Wong} } @conference {ih05_fundamentals, title = {Fundamentals of data hiding security and their application to spread-spectrum analysis}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, volume = {3727}, year = {2005}, month = {June}, pages = {131-145}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, address = {Barcelona, Spain}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Mauro Barni and Jordi Herrera-Joancomart{\'\i} and Stefan Katzenbeisser and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ih05_sideinformed, title = {Information-theoretic analysis of security in side-informed data hiding}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, volume = {3727}, year = {2005}, note = {6-8 June}, pages = {131-145}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Mauro Barni and Jordi Herrera-Joancomart{\'\i} and Stefan Katzenbeisser and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {wiamis05, title = {An information-theoretic framework for assessing security in practical watermarking and data hiding scenarios}, booktitle = {International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS)}, year = {2005}, month = {April}, address = {Montreux, Switzerland}, keywords = {data-hiding, security, watermarking}, author = {Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {ch08_AlNeMoCo_05_a, title = {Joint precoding and predistortion techniques for satellite telecommunication systems}, booktitle = {International Workshop on Satellite and Space Communications (IWSSC)}, year = {2005}, month = {September}, address = {Siena, Italy}, keywords = {Digital Communications, precoding, satellite communications} } @article {uvigo:tsp-rdm, title = {Rational Dither Modulation: a high-rate data-hiding method robust to gain attacks}, journal = {IEEE Transactions on Signal Processing}, volume = {53}, number = {10}, year = {2005}, note = {Third supplement on secure media}, month = {October}, pages = {3960-3975}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera and Mauro Barni and Andrea Abrardo} } @article {uvigo:shorteners, title = {Realizable minimum mean-squared error channel shorteners}, journal = {IEEE Transactions on Signal Processing}, volume = {53}, number = {11}, year = {2005}, month = {November}, pages = {4354{\textendash}4362}, keywords = {adaptive signal processing, Channel shortening}, doi = {10.1109/TSP.2005.857050}, author = {R. L{\'o}pez-Valcarce} } @conference {iwdw05, title = {The return of the sensitivity attack}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, series = {Lecture Notes in Computer Science}, volume = {3710}, year = {2005}, month = {September}, pages = {260-274}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, address = {Siena, Italy}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Mauro Barni and Ingemar J. Cox and Ton Kalker and H. J. Kim} } @conference {cms05, title = {On reversibility of random binning techniques: multimedia perspectives}, booktitle = {Conference on Communications and Multimedia Security (CMS)}, series = {Lecture Notes in Computer Science}, year = {2005}, month = {September}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, address = {Salzburg, Austria}, keywords = {data-hiding, watermarking}, author = {Sviatoslav Voloshynovskiy and Oleksiy Koval and E. Topak and Jose Emilio Vila-Forc{\'e}n and Pedro Comesa{\~n}a and Thierry Pun} } @conference {spie05:dzq, title = {Robustness Improvement of Known-Host-State Watermarking Using Host Statistics}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Oleksiy Koval and Sviatoslav Voloshynovskiy and Frederic Deguillaume and Fernando P{\'e}rez-Gonz{\'a}lez and Thierry Pun}, editor = {Edward J. Delp and Ping W. Wong} } @conference {spie05:scs, title = {Spread-spectrum vs. quantization-based data hiding: misconceptions and implications}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @conference {spie05:wca, title = {Worst case additive attack against quantization-based data-hiding methods}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2005}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Jose Emilio Vila-Forc{\'e}n and Sviatoslav Voloshynovskiy and Oleksiy Koval and Fernando P{\'e}rez-Gonz{\'a}lez and Thierry Pun}, editor = {Edward J. Delp and Ping W. Wong} } @conference {uvigo:bias, title = {Bias analysis and removal of a microphone array based road traffic speed estimator}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2004}, address = {Vienna, Austria}, keywords = {microphone arrays, speed estimation, traffic monitoring}, author = {R. L{\'o}pez-Valcarce and D. Hurtado and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:laguerre, title = {Blind input, initial state, and system identification of SIMO Laguerre systems}, journal = {IEEE Transactions on Signal Processing}, volume = {52}, number = {12}, year = {2004}, month = {December}, pages = {3357{\textendash}3369}, keywords = {blind identification, blind input estimation, Laguerre systems, system identification}, doi = {10.1109/TSP.2004.837438}, author = {Jacob H. Gunther and R. L{\'o}pez-Valcarce} } @conference {spie04EM, title = {Blind iterative decoding of side-informed data hiding using the Expectation-Maximization algorithm}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2004}, month = {January}, pages = {805-815}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a}, editor = {Edward J. Delp and Ping W. Wong} } @conference {wiamis04:turbodec, title = {Blind Turbo Decoding of Side-Informed Data Hiding Using Iterative Channel Estimation}, booktitle = {International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS)}, year = {2004}, month = {April}, address = {Lisboa}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:broadband, title = {Broadband analysis of a microphone array based road traffic speed estimator}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)}, year = {2004}, address = {Sitges, Barcelona, Spain}, keywords = {microphone arrays, speed estimation, traffic monitoring}, doi = {10.1109/SAM.2004.1503005}, author = {R. L{\'o}pez-Valcarce} } @article {uvigo:fourthpower, title = {Cost minimisation interpretation of fourth power phase estimator and links to multimodulus algorithm}, journal = {IEE Electronics Letters}, volume = {40}, number = {4}, year = {2004}, month = {19 February}, pages = {278{\textendash}279}, keywords = {constant modulus, Digital Communications, equalization, multimodulus, phase estimation}, author = {R. L{\'o}pez-Valcarce} } @article {uvigo:speedestjnl, title = {Estimation of road vehicle speed using two omnidirectional microphones: a maximum likelihood approach}, journal = {EURASIP Journal of Applied Signal Processing}, volume = {2004}, number = {8}, year = {2004}, month = {August}, pages = {1059{\textendash}1077}, keywords = {microphone arrays, speed estimation, traffic monitoring}, author = {R. L{\'o}pez-Valcarce and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {wiamis04:dm, title = {Improved Binary Dither-Modulation with perceptual constraints}, booktitle = {International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS)}, year = {2004}, month = {April}, address = {Lisboa, Portugal}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a} } @article {uvigo:boundary-processing, title = {Linear Boundary Extensions for Finite Length Signals and Paraunitary Two-Channel Filter Banks}, journal = {IEEE Transactions on Signal Processing}, volume = {52}, number = {11}, year = {2004}, month = {November}, pages = {3213-3226}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @article {uvigo:teq, title = {Minimum delay spread TEQ design in multicarrier systems}, journal = {IEEE Signal Processing Letters}, volume = {11}, number = {8}, year = {2004}, month = {August}, pages = {682{\textendash}685}, keywords = {channel shortener, cyclic prefix, delay spread, Digital Communications, multicarrier communications, time domain equalizer}, doi = {10.1109/LSP.2004.831676}, author = {R. L{\'o}pez-Valcarce} } @conference {IEEEVTC{\textquoteright}04, title = {Performance of Coding and Synchronization Schemes for a DVB-S Based Air-Interface in the Railway Environment}, booktitle = {Vehicular Technology Conference (VTC)}, volume = {1}, year = {2004}, month = {May 17-19}, pages = {347-351}, address = {Milano, Italy}, keywords = {Digital Communications, DVB-S, satellite communications}, author = {Sandro Scalise and Giorgio Sciascia and Marcos {\'A}lvarez-D{\'\i}az and Harald Ernst and Rodolfo Mura} } @conference {Mosquera04a, title = {POLI-MAS: Power-Line Multichannel Audio System}, booktitle = {International Symposium on Power Line Communications and Its Applications (ISPLC)}, year = {2004}, keywords = {audio, multichannel, PLC}, author = {Fernando J. Mato-M{\'e}ndez and C. Mosquera} } @conference {spie04, title = {Quantifying Security Leaks in Spread Spectrum Data Hiding: A Game Theoretic Approach}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2004}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} } @conference {acm04, title = {Quantization-based watermarking performance improvement using host statistics: additive noise attack}, booktitle = {ACM Workshop on Multimedia and Security (MMSEC)}, year = {2004}, month = {September 20-21}, address = {Magdeburg, Germany}, author = {Oleksiy Koval and Sviatoslav Voloshynovskiy and Fernando P{\'e}rez-Gonz{\'a}lez and Frederic Deguillaume and Thierry Pun} } @conference {mmsp04:rdm, title = {Rational Dither Modulation: a novel data-hiding method robust to value-metric attacks}, booktitle = {IEEE International Workshop on Multimedia Signal Processing}, year = {2004}, month = {29 Sept - 1 Oct}, pages = {139-142}, address = {Siena, Italy}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Mauro Barni and Andrea Abrardo and C. Mosquera} } @article {uvigo:realizable, title = {Realizable linear and decision feedback equalizers: properties and connections}, journal = {IEEE Transactions on Signal Processing}, volume = {52}, number = {3}, year = {2004}, note = {Recipient of a 2005 Best Paper Award of the IEEE Signal Processing Society}, month = {March}, pages = {757{\textendash}773}, keywords = {adaptive signal processing, channel equalization}, doi = {10.1109/TSP.2003.822360}, author = {R. L{\'o}pez-Valcarce} } @conference {mmsp04:scs, title = {Revealing the true achievable rates of Scalar Costa Scheme}, booktitle = {IEEE International Workshop on Multimedia Signal Processing}, year = {2004}, month = {29 Sept - 1 Oct}, pages = {203-206}, address = {Siena, Italy}, keywords = {data-hiding, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Sviatoslav Voloshynovskiy} } @conference {eusipco04, title = {Spread Spectrum Watermarking for Real Images: Is Everything So Hopeless?}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2004}, month = {September 6-10}, address = {Vienna, Austria}, author = {Oleksiy Koval and Sviatoslav Voloshynovskiy and Fernando P{\'e}rez-Gonz{\'a}lez and Frederic Deguillaume and Thierry Pun} } @conference {mmsp04:worstcase, title = {Worst case additive attack against quantization-based watermarking techniques}, booktitle = {IEEE International Workshop on Multimedia Signal Processing}, year = {2004}, month = {29 Sept - 1 Oct}, pages = {135-138}, address = {Siena, Italy}, author = {Jose Emilio Vila-Forc{\'e}n and Sviatoslav Voloshynovskiy and Oleksiy Koval and Thierry Pun and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:multipliers, title = {An algorithm for unit-norm equation-error system identification based on the method of multipliers}, journal = {IEEE Transactions on Signal Processing}, volume = {51}, number = {12}, year = {2003}, month = {December}, pages = {3080{\textendash}3085}, keywords = {adaptive IIR filters, equation error, system identification, unit-norm}, author = {R. L{\'o}pez-Valcarce} } @conference {uvigo:applicability, title = {On the applicability to correlated sources of a blind channel equalization method robust to order overestimation}, booktitle = {IFAC Symposium on System Identification}, year = {2003}, address = {Rotterdam, the Netherlands}, keywords = {correlated sources, Digital Communications, equalization, order overestimation, second-order statistics}, author = {R. L{\'o}pez-Valcarce} } @conference {uvigo:iterative, title = {Blind iterative decision feedback equalizers for block QAM transmission systems}, booktitle = {Baiona Workshop on Signal Processing in Communications}, year = {2003}, pages = {57{\textendash}62}, address = {Baiona, Pontevedra, Spain}, keywords = {blind equalization, decision feedback equalization, iterative equalization}, author = {R. L{\'o}pez-Valcarce} } @conference {IST{\textquoteright}03, title = {Characterization of the Railroad Satellite Channel within the FIFTH Project}, booktitle = {IST Mobile \& Wireless Communications Summit}, year = {2003}, month = {June 15-18}, address = {Aveiro, Portugal}, keywords = {Digital Communications, satellite communications}, author = {Sandro Scalise and Marcos {\'A}lvarez-D{\'\i}az and Giorgio Sciascia and Rodolfo Mura} } @mastersthesis {Balado03, title = {Digital image data hiding using side information}, year = {2003}, school = {University of Vigo, Spain}, type = {phd}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado} } @conference {icip03a, title = {Dither-Modulation Data hiding with distortion-compensation: exact performance analysis and an improved detector for JPEG attacks.}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2003}, publisher = {IEEE}, organization = {IEEE}, address = {Barcelona, Spain}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a and F{\'e}lix Balado} } @conference {Baiona{\textquoteright}03, title = {DVB-S Air Interface over Railroad Satellite Channel: Performance and Extensions}, booktitle = {Baiona Workshop on Signal Processing in Communications}, year = {2003}, month = {September 8-10}, address = {Baiona, Spain}, keywords = {Digital Communications, DVB-S, satellite communications}, author = {Marcos {\'A}lvarez-D{\'\i}az and Sandro Scalise and Giorgio Sciascia and Rodolfo Mura and Paolo Conforto and Harald Ernst} } @conference {Mosquera03c, title = {Feedback Timing Synchronization for IF-Sampled Systems}, booktitle = {International Workshop on Signal Processing for Space Communications (SPSC)}, year = {2003}, keywords = {PLC}, author = {C. Mosquera and M. Cacheda} } @conference {uvigo:hexagonal, title = {Hexagonal Quantizers are not Optimal for 2-D Data Hiding}, booktitle = {Security and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5020}, year = {2003}, month = {jan}, address = {Santa Clara, USA}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Ping W. Wong and Edward J. Delp} } @conference {iwdw03:invited, title = {The Importance of aliasing in structured quantization index modulation data hiding (invited lecture)}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, series = {Lecture Notes in Computer Science}, volume = {2939 / 2004}, year = {2003}, month = {October}, pages = {1-17}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Mosquera03b, title = {Indoor Image Acquisition and Distribution System}, booktitle = {International Symposium on Power Line Communications and Its Applications (ISPLC)}, year = {2003}, keywords = {PLC}, author = {D. Fondo and M. Cacheda and C. Mosquera} } @conference {ASMS{\textquoteright}03, title = {Link Design for Satellite Based Services in the Fast Train Environment}, booktitle = {International Conference on Advanced Satellite Mobile Systems (ASMS)}, year = {2003}, month = {July 10-11}, address = {ESRIN, Frascati, Italy}, keywords = {Digital Communications, satellite communications}, author = {Sandro Scalise and Paolo Conforto and Marcos {\'A}lvarez-D{\'\i}az and Giorgio Sciascia and Rodolfo Mura and Harald Ernst} } @conference {ICSSC{\textquoteright}03, title = {Link Performance for Mobile Satellite Based Services in Ku-Band}, booktitle = {AIAA International Communications Satellite Systems Conference (ICSSC)}, year = {2003}, month = {April 15-19}, address = {Yokohama, Japan}, keywords = {Digital Communications, satellite communications}, author = {Giorgio Sciascia and Sandro Scalise and Harald Ernst and Marcos {\'A}lvarez-D{\'\i}az and Matthias Holzbock and Rodolfo Mura} } @conference {Mosquera03a, title = {A low complexity all-digital DS-SS transceiver for power-line communications}, booktitle = {International Symposium on Power Line Communications and Its Applications (ISPLC)}, year = {2003}, keywords = {DS-SS, modem, PLC}, author = {M. Ferreiro and M. Cacheda and C. Mosquera} } @conference {iwdw03, title = {Optimal Data-Hiding Strategies for Games with BER Payoffs}, booktitle = {International Workshop on Digital Watermarking (IWDW)}, series = {Lecture Notes in Computer Science}, volume = {2939 / 2004}, year = {2003}, month = {October}, pages = {101-116}, publisher = {Springer-Verlag Heidelberg}, organization = {Springer-Verlag Heidelberg}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado}, editor = {Ton Kalker and Ingemar J. Cox and Yong Man Ro} } @conference {icip03, title = {Optimal Strategies for Spread-Spectrum and Quantized-Projection image data hiding games with BER Payoffs}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2003}, month = {sep}, publisher = {IEEE}, organization = {IEEE}, address = {Barcelona, Spain}, keywords = {data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado} } @article {uvigo:existingandnew, title = {Performance Analysis of Existing and New Methods for Data Hiding with Known-Host Information in Additive Channels}, journal = {IEEE Transactions on Signal Processing}, volume = {51}, number = {4}, year = {2003}, note = {Special Issue on Signal Processing for Data Hiding in Digital Media \& Secure Content Delivery}, pages = {960-980}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado and Juan R. Hern{\'a}ndez} } @conference {VTC{\textquoteright}04, title = {Performance of DVB-S Air-Interface over Land Mobile Satellite Channel at Ku-Band for Fast Trains}, booktitle = {International Workshop on Signal Processing for Space Communications (SPSC)}, year = {2003}, month = {September 24-26}, address = {Catania, Italia}, keywords = {Digital Communications, DVB-S, satellite communications}, author = {Marcos {\'A}lvarez-D{\'\i}az and Sandro Scalise and Giorgio Sciascia and Rodolfo Mura and Paolo Conforto and Vincenzo Schena and Harald Ernst} } @article {uvigo:nlpsk, title = {Second order statistical properties of nonlinearly distorted PSK signals}, journal = {IEEE Communications Letters}, volume = {7}, number = {7}, year = {2003}, month = {July}, pages = {323{\textendash}325}, keywords = {Digital Communications, equalization, nonlinear channels, PSK modulation, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @article {uvigo:subband, title = {Subband hyperstable adaptive IIR filters}, journal = {IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing}, volume = {50}, number = {7}, year = {2003}, month = {July}, pages = {383{\textendash}389}, keywords = {adaptive IIR filters, subband adaptive filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:visible, title = {Visible Encryption: Using Paper as a Secure Channel}, booktitle = {Security and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5020}, year = {2003}, address = {Santa Clara, USA}, keywords = {2-D-Bar-Codes, data-hiding, print-\&-scan, Two-dimensional-modulations, visible-encryption}, author = {Norberto Degara-Quintela and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Ping W. Wong and Edward J. Delp} } @article {uvigo:analysispilot, title = {Analysis of Pilot-Based Synchronization Algorithms for Watermarking of Still Images}, journal = {Signal Processing: Image Communication}, volume = {17}, number = {8}, year = {2002}, month = {September}, pages = {661-633}, keywords = {data-hiding, watermarking}, author = {Manuel Alvarez-Rodr{\'\i}guez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:prewhitened, title = {Analysis of the prewhitened constant modulus cost function}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {3}, year = {2002}, pages = {2641-2644}, address = {Orlando, FL, USA}, keywords = {constant modulus, Digital Communications, equalization}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:eigenvector, title = {Automatic delay selection in blind channel equalization: a prewhitening + eigenvector approach}, booktitle = {Asilomar Conference on Signals, Systems and Computers}, year = {2002}, address = {Pacific Grove, CA, USA}, keywords = {Digital Communications, equalization, higher-order statistics}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:staggered, title = {Channel equalization with staggered modulation formats}, booktitle = {IEEE International Conference on Digital Signal Processing (DSP)}, year = {2002}, pages = {769{\textendash}772}, address = {Santorini, Greece}, keywords = {Digital Communications, equalization, staggered modulation}, author = {R. L{\'o}pez-Valcarce} } @conference {uvigo:improvingdatahiding, title = {Improving Data Hiding Performance by Using Quantization in a Projected Domain}, booktitle = {IEEE International Conference on Multimedia and Expo (ICME)}, year = {2002}, month = {August}, address = {Lausanne, Switzerland}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado} } @conference {uvigo:nothing, title = {Nothing But a Kiss: A Novel and Accurate Approach to Assessing the Performance of Multidimensional Distortion-Compensated Dither Modulation}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, year = {2002}, month = {October}, publisher = {Springer-Verlag}, organization = {Springer-Verlag}, address = {Noorwijkerhout, The Netherlands}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado} } @conference {Prelcic02b, title = {Polynomial extension method for size-limited paraunitary filter banks}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2002}, month = {September}, address = {Toulouse, France}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @conference {uvigo:probably, title = {Provably or Probably Robust Data Hiding?}, booktitle = {IEEE International Conference on Multimedia and Expo (ICME)}, year = {2002}, month = {August}, address = {Lausanne, Switzerland}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:quantized, title = {Quantized Projection Data Hiding}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2002}, month = {September}, address = {Rochester (NY), USA}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and F{\'e}lix Balado} } @conference {uvigo:speedest, title = {Road vehicle speed estimation from a two-microphone array}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {2}, year = {2002}, pages = {1321{\textendash}1324}, address = {Orlando, FL, USA}, keywords = {microphone arrays, speed estimation, traffic monitoring}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and R. L{\'o}pez-Valcarce and C. Mosquera} } @conference {Prelcic02a, title = {Smooth Orthogonal Signal Extensions for Paraunitary Tree-structured Filter Banks}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2002}, month = {May}, address = {Orlando, USA}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @conference {Mosquera02, title = {Spectral characterization of feedback linear periodically time-varying systems}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2002}, keywords = {burst, inversion, LPTV, PLL}, author = {C. Mosquera and Sandro Scalise and G. Taricco} } @mastersthesis {801, title = {Adaptive algorithms for identification and equalization using recursive filters}, volume = {Ph.D.}, year = {2001}, month = {11/2001}, school = {University of Vigo}, type = {Ph.D. thesis}, address = {Vigo, Spain}, keywords = {adaptive signal processing}, author = {R. L{\'o}pez-Valcarce} } @article {Mosquera01c, title = {Adaptive IIR Filters for Active Noise Control}, journal = {International Journal of Acoustics and Vibration}, volume = {6}, year = {2001}, pages = {3-10}, keywords = {ANC, IIR, SPR}, author = {C. Mosquera and J.A. G{\'o}mez and Fernando P{\'e}rez-Gonz{\'a}lez and M. Sobreira and E. Alexandre} } @article {uvigo:revisited, title = {Adaptive lattice IIR filtering revisited: convergence issues and new algorithms with improved stability properties}, journal = {IEEE Transactions on Signal Processing}, volume = {49}, number = {4}, year = {2001}, month = {April}, pages = {811{\textendash}821}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:audio-wavelets, title = {An adaptive tiling of the time-frequency plane with application to multiresolution-based perceptive audio coding}, journal = {Signal Processing}, volume = {81/2}, year = {2001}, month = {March}, pages = {301-319}, author = {Nuria Gonz{\'a}lez-Prelcic and Antonio S. Pena} } @article {Mosquera01b, title = {Algebraic solution to the robust SPR problem for two polynomials}, journal = {Automatica}, volume = {37}, year = {2001}, month = {may}, keywords = {robust, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:approaching, title = {Approaching the Capacity Limit in Image Watermarking: A Perspective on Coding Techniques for Data Hiding Applications}, journal = {Signal Processing}, volume = {81}, number = {6}, year = {2001}, note = {Special Section on Information Theoretic Aspects of Digital Watermarking}, month = {June}, pages = {1215{\textendash}1238}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Juan R. Hern{\'a}ndez and F{\'e}lix Balado} } @article {uvigo:coloredjnl, title = {Blind channel equalization with colored sources based on second-order statistics: a linear prediction approach}, journal = {IEEE Transactions on Signal Processing}, volume = {49}, number = {9}, year = {2001}, month = {September}, pages = {2050{\textendash}2059}, keywords = {correlated sources, Digital Communications, equalization, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {uvigo:precoding, title = {Blind equalization of nonlinear channels from second order statistics using precoding and channel diversity}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {4}, year = {2001}, pages = {2073{\textendash}2076}, address = {Salt Lake City, UT, USA}, keywords = {Digital Communications, equalization, nonlinear channels}, author = {R. L{\'o}pez-Valcarce and Xuejie Song and Soura Dasgupta} } @article {uvigo:nonlinear01, title = {Blind Equalization of Nonlinear Channels from Second-Order Statistics}, journal = {IEEE Transactions on Signal Processing}, volume = {49}, number = {12}, year = {2001}, month = {December}, pages = {3084{\textendash}3097}, keywords = {Digital Communications, equalization, nonlinear channels, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {uvigo:psk, title = {Blind equalization of nonlinear digital satellite links with PSK modulation}, booktitle = {IEEE International Symposium on Circuits and Systems (ISCAS)}, volume = {2}, year = {2001}, pages = {409{\textendash}412}, address = {Sydney, Australia}, keywords = {Digital Communications, equalization, nonlinear channels, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {uvigo:deficient, title = {On blind equalization of rank deficient nonlinear channels}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2001}, pages = {269{\textendash}272}, address = {Singapore}, keywords = {Digital Communications, equalization, nonlinear channels}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {Prelcic01a, title = {A Channel Model for the Galician Low Voltage Main Network}, booktitle = {International Symposium on Power Line Communications and Its Applications (ISPLC)}, year = {2001}, month = {April}, address = {Malmo, Sweden}, author = {Nuria Gonz{\'a}lez-Prelcic and C. Mosquera and Norberto Degara-Quintela and A. Currais} } @conference {uvigo:samplelevel, title = {Coding at the Sample Level for Data Hiding: Turbo and Concatenated Codes}, booktitle = {Security and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {4314}, year = {2001}, month = {January}, pages = {532{\textendash}543}, address = {San Jos{\'e}, USA}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Ping W. Wong and Edward J. Delp} } @article {uvigo:reinit01, title = {Efficient Reinitialization of the Prewhitened Constant Modulus Algorithm}, journal = {IEEE Communications Letters}, volume = {5}, number = {12}, year = {2001}, month = {December}, pages = {488{\textendash}490}, keywords = {constant modulus, Digital Communications, equalization}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:cancellation, title = {Equalization and interference cancellation in linear multiuser systems based on second-order statistics}, journal = {IEEE Transactions on Signal Processing}, volume = {49}, number = {9}, year = {2001}, month = {September}, pages = {2042{\textendash}2049}, keywords = {Digital Communications, equalization, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Zhi Ding and Soura Dasgupta} } @conference {Prelcic01b, title = {Orthogonal Extensions of AR Processes without Artificial Discontinuities for Size-Limites Filter Banks}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2001}, month = {August}, address = {Singapur}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @conference {uvigo:coloredcnf, title = {Second order statistics based blind channel equalization with correlated sources}, booktitle = {IEEE International Symposium on Circuits and Systems (ISCAS)}, volume = {4}, year = {2001}, pages = {366{\textendash}369}, address = {Sydney, Australia}, keywords = {correlated sources, Digital Communications, equalization, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @article {uvigo:someproperties, title = {Some properties of the matrix exponential}, journal = {IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing}, volume = {48}, number = {2}, year = {2001}, month = {February}, pages = {213{\textendash}215}, keywords = {exponential matrix, linear algebra}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @article {Mosquera01a, title = {On the strengthened robust SPR problem for discrete-time systems}, journal = {Automatica}, volume = {37}, year = {2001}, month = {apr}, pages = {625-628}, keywords = {robust, SPR, strengthened}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Mosquera_Scalise01, title = {Time-transfer performance in burst-mode communication systems}, booktitle = {International Workshop on Digital Signal Processing Techniques for Space Communications (DSP)}, year = {2001}, keywords = {burst, PLL, synchronization}, author = {C. Mosquera and Sandro Scalise and G. Taricco and D. Giunta} } @article {Mosquera01d, title = {Time-transfer performance in burst-mode communication systems}, journal = {IEEE Journal on Selected Areas in Communications}, volume = {19}, year = {2001}, month = {dec}, pages = {2310-2319}, keywords = {burst, PLL, synchronization}, author = {C. Mosquera and Sandro Scalise and G. Taricco and G. Garofalo and D. Giunta} } @conference {uvigo:turbocoding, title = {Turbo Coding for Sample-Level Watermarking in the DCT Domain}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, year = {2001}, month = {October}, pages = {1003{\textendash}1006}, address = {Thessaloniki, Greece}, keywords = {data-hiding, watermarking}, author = {F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez and Sandro Scalise} } @article {uvigo:equalization-wavelets, title = {Wavelet-packet-based subband adaptive equalization}, journal = {Signal Processing}, volume = {81}, number = {8}, year = {2001}, month = {August}, pages = {1641-1662}, author = {Nuria Gonz{\'a}lez-Prelcic and Fernando P{\'e}rez-Gonz{\'a}lez and M. Elena Dom{\'\i}nguez-Jim{\'e}nez} } @conference {icc00, title = {Analytical Bounds on the Error Performance of the DVB-T System in Time-Invariant Channels}, booktitle = {IEEE International Conference on Communications (ICC)}, year = {2000}, month = {June}, address = {New Orleans, LA, USA}, keywords = {Digital Communications, Digital Television, Rayleigh, Rice, Terrestrial}, author = {Jos{\'e} M. Lago and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {arbox_journal, title = {ArboX, a Contribution to Digital Library}, journal = {Computer Applications in Engineering Education}, volume = {8}, number = {3{\textendash}4}, year = {2000}, month = {Oct{\textendash}Dec}, pages = {216{\textendash}220}, author = {O.W. M{\'a}rquez and F{\'e}lix Balado and M. V{\'a}zquez and D. Docampo} } @conference {uvigo:blindadaptive, title = {On blind adaptive algorithms for IIR equalizers}, booktitle = {IEEE Digital Signal Processing Workshop (DSP)}, year = {2000}, address = {Hunt, TX, USA}, keywords = {adaptive IIR filters, Digital Communications, equalization, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:identifiability, title = {Blind channel identifiability/equalizability of single input multiple output nonlinear channels from second order statistics}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {5}, year = {2000}, pages = {2769{\textendash}2772}, address = {Istanbul, Turkey}, keywords = {Digital Communications, equalization, nonlinear channels, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @mastersthesis {802, title = {Blind equalization of linear and nonlinear digital communication channels from second-order statistics}, volume = {Ph.D.}, year = {2000}, month = {12/2000}, school = {University of Iowa}, type = {Ph.D. thesis}, address = {Iowa City, USA}, keywords = {adaptive signal processing, channel equalization}, author = {R. L{\'o}pez-Valcarce} } @article {Mosquera00, title = {Convergence analysis of the multiple-channel filtered-U recursive LMS algorithm for active noise control}, journal = {Signal Processing}, volume = {80}, year = {2000}, pages = {849-856}, keywords = {ANC, FuRLMS, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:dctdomain, title = {DCT-Domain Watermarking Techniques for Still Images: Detector Performance Analysis and a New Structure}, journal = {IEEE Transactions on Image Processing}, volume = {9}, number = {1}, year = {2000}, note = {Special Issue on Image and Video Processing for Digital Libraries}, month = {January}, pages = {55{\textendash}68}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Mart{\'\i}n Amado and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Prelcic00a, title = {Design of non-expansionist and orthogonal extension methods for tree-structured filter banks}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {2000}, month = {June}, address = {Estambul, Turkey}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @article {uvigo:eas, title = {Exponential asymptotic stability of time-varying inverse prediction error filters}, journal = {IEEE Transactions on Signal Processing}, volume = {48}, number = {7}, year = {2000}, month = {July}, pages = {1928{\textendash}1936}, keywords = {nonstationary processes, prediction error filters, stability}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta and Roberto Tempo and Minyue Fu} } @article {uvigo:improvingperformance, title = {Improving the Performance of Spatial Watermarking of Images Using Channel Coding}, journal = {Signal Processing}, volume = {80}, number = {7}, year = {2000}, month = {July}, pages = {1261-1279}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Jos{\'e} M. Rodr{\'\i}guez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:interference, title = {Interference cancellation and blind equalization for linear multi-user systems}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {1}, year = {2000}, pages = {145{\textendash}148}, address = {Istanbul, Turkey}, keywords = {Digital Communications, equalization, second-order statistics}, author = {Zhi Ding and Soura Dasgupta and R. L{\'o}pez-Valcarce} } @conference {uvigo:misconvergence, title = {Misconvergence and stabilization of adaptive IIR lattice filters}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {1}, year = {2000}, pages = {65{\textendash}68}, address = {Istanbul, Turkey}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and R. L{\'o}pez-Valcarce} } @conference {Prelcic00b, title = {New Orthogonal Extension Methods for Tree-Structured Filter Banks}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2000}, month = {September}, address = {Tampere, Finland}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @conference {uvigo:role, title = {The role of second-order statistics in blind equalization of nonlinear channels}, booktitle = {IEEE Workshop on Statistical Signal Processing (SSP)}, year = {2000}, pages = {211{\textendash}215}, address = {Pocono Manor, PA, USA}, keywords = {Digital Communications, equalization, nonlinear channels, second-order statistics}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {arbox, title = {ArboX, a Contribution to Digital Library}, booktitle = {International Conference on Engineering and Computer Education (ICECE)}, year = {1999}, month = {August}, publisher = {IEEE Education Society}, organization = {IEEE Education Society}, address = {Rio de Janeiro, Brazil}, author = {O.W. M{\'a}rquez and F{\'e}lix Balado and M. V{\'a}zquez and D. Docampo} } @conference {bayona99, title = {BER Performance of the DVB-T System in Time-Invariant Channels}, booktitle = {Baiona Workshop on Emerging Technologies in Communications}, year = {1999}, month = {September}, pages = {230-235}, address = {Baiona-Vigo, Spain}, keywords = {Digital Communications, Digital Television, Rayleigh, Rice, Terrestrial}, author = {Jos{\'e} M. Lago and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:polyjnl, title = {Hyperstable adaptive IIR algorithms with polyphase structures: analysis and design}, journal = {IEEE Transactions on Signal Processing}, volume = {47}, number = {7}, year = {1999}, month = {July}, pages = {2043{\textendash}2046}, keywords = {adaptive IIR filters, system identification}, author = {R. L{\'o}pez-Valcarce and C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:polycnf, title = {Hyperstable polyphase adaptive IIR filters}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {4}, year = {1999}, pages = {1841{\textendash}1844}, address = {Phoenix, AZ, USA}, keywords = {adaptive IIR filters, system identification}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez and R. L{\'o}pez-Valcarce} } @conference {Mosquera_Perez99, title = {IIR adaptive filters for active noise control}, booktitle = {International Congress on Sound and Vibration}, year = {1999}, address = {Copenhagen, Denmark}, keywords = {ANC, IIR, SPR}, author = {C. Mosquera and J.A. G{\'o}mez and Fernando P{\'e}rez-Gonz{\'a}lez and M. Sobreira} } @article {uvigo:newproof, title = {A new proof for the stability of equation-error models}, journal = {IEEE Signal Processing Letters}, volume = {6}, number = {6}, year = {1999}, month = {June}, pages = {148{\textendash}150}, keywords = {adaptive IIR filters, system identification}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {uvigo:noveldetector, title = {Novel Detector Structures for Watermark Extraction in the DCT Domain}, booktitle = {Workshop on Nonlinear Signal and Image Processing}, year = {1999}, month = {June}, publisher = {IEEE-EURASIP}, organization = {IEEE-EURASIP}, address = {Antalya, Turkey}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Mart{\'\i}n Amado and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Prelcic99a, title = {Processing Finite Length Signals via Filter Banks without Border Distortions: A Non-Expansionist Solution}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {1999}, month = {March}, address = {Phoenix, USA}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} } @article {Mosquera99, title = {The robust SPR problem: design algorithms and new applications}, journal = {Signal Processing}, volume = {76}, year = {1999}, pages = {269-283}, keywords = {robust, SPR}, author = {C. Mosquera and L. Leyra and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:remarks, title = {Some remarks on the lattice form of the Steiglitz-McBride iteration}, journal = {IEEE Signal Processing Letters}, volume = {6}, number = {11}, year = {1999}, month = {November}, pages = {290{\textendash}292}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:rwls, title = {On the stability of the inverse time-varying prediction error filter obtained with the RWLS algorithm}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {3}, year = {1999}, pages = {1673{\textendash}1676}, address = {Phoenix, AZ, USA}, keywords = {nonstationary processes, prediction error filters, stability}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @inbook {700, title = {Stable estimates in equation-error identification: an open problem}, booktitle = {Open Problems in Mathematical Systems and Control Theory}, year = {1999}, publisher = {Springer-Verlag}, organization = {Springer-Verlag}, chapter = {28}, isbn = { 1-85233-044-9}, url = {http://perso.uclouvain.be/vincent.blondel/books/openprobs/}, author = {R. L{\'o}pez-Valcarce and S. Dasgupta} } @article {uvigo:statistical, title = {Statistical Analysis of Watermarking Schemes for Copyright Protection of Images}, journal = {Proc. of the IEEE}, volume = {87}, number = {7}, year = {1999}, note = {Special Issue on Identification and Protection of Multimedia Information}, month = {July}, pages = {1142{\textendash}1166}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:atutorial, title = {A Tutorial on Digital Watermarking}, booktitle = {IEEE Annual Carnahan Conference on Security Technology}, year = {1999}, month = {October}, address = {Madrid, Spain}, keywords = {data-hiding, watermarking}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and Juan R. Hern{\'a}ndez} } @conference {fwan, title = {A Two-Stage Codebook Building Method Using Fast WAN}, booktitle = {International Conference on Image Analysis and Processing (ICIAP)}, year = {1999}, month = {September}, pages = {1047{\textendash}1050}, publisher = {IEEE Computer Society}, organization = {IEEE Computer Society}, address = {Venice, Italy}, author = {F{\'e}lix Balado and O.W. M{\'a}rquez} } @conference {Prelcic99b, title = {Wavelet Packet based subband adaptive equalization}, booktitle = {Baiona Workshop on Emerging Technologies in Telecommunications}, year = {1999}, month = {September}, address = {Baiona, Spain}, author = {Nuria Gonz{\'a}lez-Prelcic and Fernando P{\'e}rez-Gonz{\'a}lez and M. Elena Dom{\'\i}nguez-Jim{\'e}nez} } @article {uvigo:autoregressive, title = {An adaptive recursive filter for autoregressive inputs}, journal = {International Journal of Adaptive Control and Signal Processing}, volume = {12}, year = {1998}, month = {September}, pages = {467{\textendash}494}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Mosquera98d, title = {An approach to the robust SPR problem through interpolation and avoidance: connections with the robust stability problem}, booktitle = {American Control Conference}, year = {1998}, keywords = {avoidance, interpolation, robust, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:notebias, title = {On the bias of the modified output error algorithm}, journal = {IEEE Transactions on Automatic Control}, volume = {43}, number = {9}, year = {1998}, month = {September}, pages = {1261{\textendash}1262}, keywords = {adaptive IIR filters, system identification}, author = {C. Mosquera and R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:codingandsynch, title = {Coding and Synchronization: A Boost and a Bottleneck for the Development of Image Watermarking}, booktitle = {COST $\#$254 Int. Workshop on Intelligent Communications}, year = {1998}, month = {June}, pages = {77{\textendash}82}, publisher = {SSGRR}, organization = {SSGRR}, address = {L{\textquoteright}Aquila, Italy}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez and Jos{\'e} M. Rodr{\'\i}guez} } @conference {Mosquera98b, title = {Filtered error adaptive IIR algorithms and their application to active noise control}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {1998}, keywords = {adaptive, IIR, SPR}, author = {C. Mosquera and J.A. G{\'o}mez and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Prelcic98a, title = {A Flexible Structure for Wavelet Packet-based Subband Adaptive Equalization}, booktitle = {IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis}, year = {1998}, month = {October}, pages = {377{\textendash}380}, address = {Pittsburgh, USA}, author = {Nuria Gonz{\'a}lez-Prelcic and Fernando P{\'e}rez-Gonz{\'a}lez and A.B. Mosquera-Gonz{\'a}lez} } @conference {uvigo:theimpact, title = {The Impact of Channel Coding on the Performance of Spatial Watermarking for Copyright Protection}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, volume = {5}, year = {1998}, month = {May}, pages = {2973{\textendash}2976}, address = {Seattle, Washington, USA}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez and Jos{\'e} M. Rodr{\'\i}guez} } @conference {uvigo:improvingdctdomain, title = {Improving DCT-Domain Watermark Extraction Using Generalized Gaussian Models}, booktitle = {COST $\#$254 Int. Workshop on Intelligent Communications and Multimedia Terminals}, year = {1998}, month = {November}, pages = {23{\textendash}26}, address = {Ljubljana, Slovenia}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez and Mart{\'\i}n Amado} } @article {uvigo:performance, title = {Performance Analysis of a 2D-Multipulse Amplitude Modulation Scheme for Data Hiding and Watermarking of Still Images}, journal = {IEEE Journal on Selected Areas in Communications}, volume = {16}, number = {4}, year = {1998}, month = {May}, pages = {510{\textendash}524}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez and Jos{\'e} M. Rodr{\'\i}guez and Gustavo Nieto} } @mastersthesis {Mosquera98, title = {Relaxation of the SPR condition with applications to the convergence of adaptive recursive algorithms}, year = {1998}, school = {University of Vigo, Spain}, type = {phd}, author = {C. Mosquera} } @inbook {Mosquera_Perez98d, title = {The Simultaneous Strict Positive Real Problem: Similarities with the Simultaneous Stability Problem and Applications in Adaptive Recursive Algorithms}, booktitle = {Mathematics in Signal Processing}, year = {1998}, pages = {139-148}, publisher = {Oxford University Press}, organization = {Oxford University Press}, keywords = {robust, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {J.G. McWhirter and I.K. Proudler} } @conference {uvigo:conditions, title = {Stability conditions for the time-varying linear predictor}, booktitle = {IEEE Conference on Decision and Control (CDC)}, year = {1998}, month = {December}, pages = {1840{\textendash}1845}, address = {Tampa, FL, USA}, keywords = {nonstationary processes, prediction error filters, stability}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta and Minyue Fu and Roberto Tempo} } @article {uvigo:allpole, title = {On the stability of equation-error estimates of all-pole systems}, journal = {IEEE Signal Processing Letters}, volume = {5}, number = {10}, year = {1998}, month = {October}, pages = {268{\textendash}270}, keywords = {adaptive IIR filters, system identification}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {Mosquera98c, title = {On the strengthened robust SPR problem for discrete-time systems}, booktitle = {American Control Conference}, year = {1998}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {Prelcic98b, title = {Testing a Flexible Time-Frequency Mapping for High Frequencies in TARCO (Tonal Adaptive Resolution COdec)}, booktitle = {Audio Engineering Society Convention (AES Convention)}, year = {1998}, note = {Preprint 4676 (P9-6)}, month = {May}, address = {Amsterdam, The Netherlands}, author = {Alejandro Casal and Carlos Serantes and Nuria Gonz{\'a}lez-Prelcic and Antonio S. Pena} } @conference {uvigo:throwing, title = {Throwing More Light on Image Watermarks}, booktitle = {International Workshop on Information Hiding (IH)}, series = {Lecture Notes in Computer Science}, volume = {1525}, year = {1998}, month = {April}, pages = {191{\textendash}207}, publisher = {Springer-Verlag}, organization = {Springer-Verlag}, address = {Portland, Oregon, USA}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {MosqueraPerez97b, title = {An Algorithm for Interpolation with Positive Rational Functions on the Imaginary Axis}, journal = {Automatica}, volume = {33}, year = {1997}, pages = {2277-2280}, keywords = {interpolation, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} } @inbook {Mosquera_Perez97a, title = {Analysis and Synthesis Tools for Robust SPRness}, booktitle = {Intelligent methods in signal processing and communications}, year = {1997}, pages = {147-171}, publisher = {Birkhauser}, organization = {Birkhauser}, keywords = {robust, SPR}, author = {C. Mosquera and Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {A. Figueiras and D. Docampo and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:datahiding, title = {Data Hiding for Copyright Protection of Still Images}, booktitle = {Emerging Techniques for Communication Terminals}, year = {1997}, month = {July}, pages = {285{\textendash}289}, publisher = {ENSEEIHT}, organization = {ENSEEIHT}, address = {Tolouse, France}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez and Jos{\'e} M. Rodr{\'\i}guez} } @conference {Prelcic97b, title = {A Fast Noise-Scaling Algorithm for Uniform Quantization in Audio Coding Schemes}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {1997}, month = {May}, address = {Munich, Germany}, author = {Carlos Serantes and Antonio S. Pena and Nuria Gonz{\'a}lez-Prelcic} } @conference {Prelcic97a, title = {A Flexible Tiling of the Time Axis for Adaptive Wavelet Packet Audio Decompositions}, booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, year = {1997}, month = {May}, address = {Munich, Germany}, author = {Nuria Gonz{\'a}lez-Prelcic and Antonio S. Pena and Carlos Serantes} } @conference {Prelcic97c, title = {New Improvements in ARCO}, booktitle = {Audio Engineering Society Convention (AES Convention)}, year = {1997}, note = {Preprint 4419 (C-6)}, month = {March}, address = {Munich, Germany}, author = {Antonio S. Pena and Nuria Gonz{\'a}lez-Prelcic and Carlos Serantes} } @article {uvigo:newresults, title = {New results and theoretical analysis of the Master-Slave family of recursive identification algorithms}, journal = {Signal Processing}, volume = {58}, number = {1}, year = {1997}, month = {April}, pages = {79-94}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @conference {uvigo:stable, title = {Stable estimates in equation error identification}, booktitle = {IEEE Conference on Decision and Control (CDC)}, volume = {2}, year = {1997}, month = {December}, pages = {1678{\textendash}1679}, address = {San Diego, CA, USA}, keywords = {adaptive IIR filters, system identification}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} } @conference {Prelcic96a, title = {An Adaptive Tree Search Algorithm with Application to Multiresolution-based Perceptive Audio Coding}, booktitle = {IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis}, year = {1996}, month = {June}, pages = {117{\textendash}120}, address = {Paris, France}, author = {Nuria Gonz{\'a}lez-Prelcic and Antonio S. Pena} } @conference {Prelcic96c, title = {ARCO (Adaptive Resolution COdec): A Hybrid Approach to Perceptual Audio Coding}, booktitle = {Audio Engineering Society Convention (AES Convention)}, year = {1996}, note = {Preprint 4178}, month = {May}, address = {Copenhagen, Denmark}, author = {Antonio S. Pena and Carlos Serantes and Nuria Gonz{\'a}lez-Prelcic} } @conference {Perez_Mosquera96, title = {Characterization and Algebraic Solution to the Extreme-Point Robust SPR Problem}, booktitle = {IFAC World Congress}, year = {1996}, pages = {391-396}, address = {San Francisco, CA, USA}, keywords = {robust, SPR}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera} } @article {uvigo:document, title = {A comparison of system architectures for intelligent document understanding}, journal = {Signal Processing: Image Communication}, volume = {9}, number = {1}, year = {1996}, month = {November}, pages = {1-19}, author = {G. S. D. Farrow and C. S. Xydeas and J.P. Oakley and A. Khorabi and Nuria Gonz{\'a}lez-Prelcic} } @conference {Prelcic96b, title = {Considerations on the Performance of Filter Design Methods for Wavelet Packet Audio Decompositions}, booktitle = {Audio Engineering Society Convention (AES Convention)}, year = {1996}, note = {Preprint 4235}, month = {May}, address = {Copenhagen, Denmark}, author = {Nuria Gonz{\'a}lez-Prelcic and S. Gonz{\'a}lez-S{\'a}nchez and Antonio S. Pena} } @conference {uviwave2, title = {An Interactive Software for a Hypertext Course in Wavelets}, booktitle = {IEEE Digital Signal Processing Workshop (DSP)}, year = {1996}, month = {September}, address = {Loen, Norway}, author = {O.W. M{\'a}rquez and Nuria Gonz{\'a}lez-Prelcic} } @conference {uvigo:masterslave, title = {The Master-Slave family of system identification algorithms: theoretical results and new structures}, booktitle = {IFAC World Congress}, volume = {J}, year = {1996}, month = {June}, pages = {185{\textendash}190}, publisher = {IFAC}, organization = {IFAC}, address = {San Francisco, CA, USA}, keywords = {adaptive IIR filters, lattice filters, system identification}, author = {R. L{\'o}pez-Valcarce and Fernando P{\'e}rez-Gonz{\'a}lez} } @article {uvigo:speech-wavelets, title = {A multipulse-like wavelet-based speech coder}, journal = {Applied Signal Processing}, volume = {3}, year = {1996}, pages = {78-87}, author = {Nuria Gonz{\'a}lez-Prelcic and D. Docampo} } @conference {uviwave1, title = {Uvi_Wave, the Ultimate Toolbox for Wavelet Transforms and Filter Banks}, booktitle = {Baiona Workshop on Intelligent Methods in Signal Processing and Communication}, year = {1996}, month = {June}, address = {Baiona, Spain}, author = {Nuria Gonz{\'a}lez-Prelcic and O.W. M{\'a}rquez} } @conference {Perez_Mosquera95, title = {Algebraic LTI Filter Synthesis for Simultaneously Making a Convex Combination of Discrete-Time Plants SPR}, booktitle = {IEEE Conference on Decision and Control (CDC)}, year = {1995}, pages = {780-781}, address = {New Orleans, LA}, keywords = {robust, SPR}, author = {Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera} } @conference {Prelcic95, title = {A Multipulse-like Wavelet-based Speech Coder}, booktitle = {UK Symposium on Applications of Time-Frequency and Time-Scale Methods (TFTS)}, year = {1995}, month = {August}, address = {Warwick, UK}, author = {Nuria Gonz{\'a}lez-Prelcic and D. Docampo} } @conference {Prelcic94, title = {Application of singularity detection with wavelets for pitch estimation of speech signals}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {1994}, month = {September}, address = {Edimburgh, UK}, author = {Nuria Gonz{\'a}lez-Prelcic and D. Docampo} }