TY - JOUR T1 - An Adaptive Method for Camera Attribution Under Complex Radial Distortion Corrections JF - IEEE Transactions on Information Forensics and Security Y1 - 2024 A1 - Montibeller, Andrea A1 - Fernando Pérez-González KW - Adaptation models KW - adaptive processing KW - cameras KW - Distortion KW - distortion correction KW - Fingerprint recognition KW - forensics KW - Image forensics KW - Lenses KW - PCE KW - photo response non-uniformity KW - PRNU KW - radial correction KW - Smart phones KW - source attribution VL - 19 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10265255 ER - TY - CONF T1 - Multibeam Compact Dual Reflectarray Antenna for High-Throughput Satellites in Ka-Band T2 - 18th European Conference on Antennas and Propagation Y1 - 2024 A1 - Daniel Martínez-de-Rioja A1 - Eduardo Martínez-de-Rioja A1 - Y Rodríguez-Vaqueiro A1 - A Pino A1 - Carlos Mosquera A1 - José A. Encinar A1 - Giovanni Toso JF - 18th European Conference on Antennas and Propagation ER - TY - CONF T1 - Radio Maps for Beam Alignment in mmWave Communications with Location Uncertainty T2 - IEEE 99th Vehicular Technology Conference: VTC2024-Spring. Workshop "Radio Map for 6G Communications" Y1 - 2024 A1 - Tien, Ngoc-Ha A1 - Daniel Romero A1 - R. López-Valcarce KW - mayte KW - mmWave KW - radio maps AB -
Abstract—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.
JF - IEEE 99th Vehicular Technology Conference: VTC2024-Spring. Workshop "Radio Map for 6G Communications" CY - Singapore ER - TY - JOUR T1 - Sidelobe Suppression for Multicarrier Signals via Structured Spectral Precoding JF - IEEE Transactions on Communications Y1 - 2024 A1 - Khawar Hussain A1 - R. López-Valcarce A1 - Francesc Rey A1 - Josep Sala A1 - Javier Villares KW - mayte KW - multicarrier communications KW - OFDM KW - spectrum shaping AB -
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.
ER - TY - CONF T1 - Clock and Orientation-Robust Simultaneous Radio Localization and Mapping at Millimeter Wave Bands T2 - 2023 IEEE Wireless Communications and Networking Conference (WCNC) Y1 - 2023 A1 - Gomez-Cuba, Felipe A1 - Feijoo-Rodríguez, Gonzalo A1 - González-Prelcic, Nuria JF - 2023 IEEE Wireless Communications and Networking Conference (WCNC) ER - TY - JOUR T1 - Contribution of non-orthogonal multiple access signalling to practical multibeam satellite deployments JF - International Journal of Satellite Communications and Networking Y1 - 2023 A1 - Tomás Ramírez A1 - Carlos Mosquera ER - TY - CONF T1 - Direction of Arrival Estimation with Hybrid Digital Analog Arrays: Algorithms and Ziv-Zakai Lower Bound T2 - Asilomar Conference on Signals, Systems, and Computers Y1 - 2023 A1 - Miguel Rivas-Costa A1 - Carlos Mosquera JF - Asilomar Conference on Signals, Systems, and Computers ER - TY - CONF T1 - Exploiting PRNU and Linear Patterns in Forensic Camera Attribution under Complex Lens Distortion Correction T2 - ICASSP 2023 - 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2023 A1 - Montibeller, Andrea A1 - Fernando Pérez-González KW - Acoustic distortion KW - Camera Attribution KW - Camera Source Identification KW - cameras KW - forensics KW - GPU KW - Graphics processing units KW - interpolation KW - PRNU KW - Radial Distortion Correction KW - Reliability KW - Software JF - ICASSP 2023 - 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10096605 ER - TY - CONF T1 - Frequency-selective hybrid beamforming for mmWave full-duplex T2 - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2023 A1 - Andrea Guamo-Morocho A1 - R. López-Valcarce KW - full-duplex KW - mmWave KW - rodin AB -
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.
JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) CY - Rhodes, Greece ER - TY - JOUR T1 - Information Forensics and Security: A quarter-century-long journey JF - IEEE Signal Processing Magazine Y1 - 2023 A1 - Barni, Mauro A1 - Campisi, Patrizio A1 - Delp, Edward J. A1 - Doërr, Gwenaël A1 - Fridrich, Jessica A1 - Memon, Nasir A1 - Fernando Pérez-González A1 - Rocha, Anderson A1 - Verdoliva, Luisa A1 - Wu, Min KW - forensics KW - History KW - Information processing KW - Information security KW - Intellectual property KW - Machine Learning KW - privacy KW - Signal processing KW - Surveillance VL - 40 UR - https://ieeexplore.ieee.org/document/10188887 ER - TY - CONF T1 - Introducing the TRUMPET project: TRUstworthy Multi-site Privacy Enhancing Technologies T2 - IEEE International Conference on Cyber Security and Resilience (CSR) Y1 - 2023 A1 - Alberto Pedrouzo-Ulloa A1 - Jan Ramon A1 - Fernando Pérez-González A1 - Siyanna Lilova A1 - Patrick Duflot A1 - Zakaria Chihani A1 - Nicola Gentili A1 - Paola Ulivi A1 - Mohammad Ashadul Hoque A1 - Twaha Mukammel A1 - Zeev Pritzker A1 - Augustin Lemesle A1 - Jaime Loureiro-Acuña A1 - Xavier Martínez A1 - Gonzalo Jiménez-Balsa JF - IEEE International Conference on Cyber Security and Resilience (CSR) PB - IEEE CY - Venice, Italy SN - 979-8-3503-1170-9 ER - TY - JOUR T1 - Link Adaptation for Rate Splitting Systems with Partial CSIT JF - IEEE Journal on Selected Areas in Communications Y1 - 2023 A1 - Carlos Mosquera A1 - Felipe Gómez-Cuba ER - TY - CONF T1 - Overview of Use Cases in Single Channel Full Duplex Techniques for Satellite Communication T2 - 40th International Communications Satellite Systems Conference (ICSSC) Y1 - 2023 A1 - Víctor Monzón Baeza A1 - Carlos Mosquera A1 - Roberto López-Valcarce A1 - JL González-Ríos A1 - JA Vasquez-Peralvo A1 - Tomás Ramírez A1 - P Losada A1 - JC Merlano A1 - S Chatzinotas A1 - Steven Kisseleff JF - 40th International Communications Satellite Systems Conference (ICSSC) ER - TY - CONF T1 - Practical Multi-Key Homomorphic Encryption for More Flexible and Efficient Secure Federated Average Aggregation T2 - IEEE International Conference on Cyber Security and Resilience (CSR) Y1 - 2023 A1 - Alberto Pedrouzo-Ulloa A1 - Aymen Boudguiga A1 - Olive Chakraborty A1 - Renaud Sirdey A1 - Oana Stan A1 - Martin Zuber JF - IEEE International Conference on Cyber Security and Resilience (CSR) PB - IEEE CY - Venice, Italy SN - 979-8-3503-1170-9 ER - TY - JOUR T1 - Source camera attribution via PRNU emphasis: Towards a generalized multiplicative model JF - Signal Processing: Image Communication Y1 - 2023 A1 - Fernández-Menduiña, Samuel A1 - Fernando Pérez-González A1 - Miguel Masciopinto VL - 114 UR - https://www.sciencedirect.com/science/article/pii/S0923596523000267 ER - TY - THES T1 - Spectrum Shaping Techniques for Advanced Multicarrier Communication Systems Y1 - 2023 A1 - Khawar Hussain AB -
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’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.

 

PB - Universidade de Vigo CY - Vigo VL - PhD ER - TY - CONF T1 - Towards Traitor Tracing in Black-and-White-Box DNN Watermarking with Tardos-Based Codes T2 - 2023 IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2023 A1 - Elena Rodríguez-Lois A1 - Fernando Pérez-González KW - Artificial neural networks KW - black-box KW - Closed box KW - Codes KW - Data security KW - DNN watermarking KW - Fingerprinting KW - forensics KW - Tardos codes KW - Training KW - Traitor tracing KW - watermarking KW - white-box JF - 2023 IEEE International Workshop on Information Forensics and Security (WIFS) UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10374879 ER - TY - CONF T1 - Contribution of NOMA Signalling to Practical Multibeam Satellite Deployments T2 - 11th Advanced Satellite Multimedia Conference and 17th Signal Processing for Space Communications Workshop Y1 - 2022 A1 - Tomás Ramírez A1 - Carlos Mosquera JF - 11th Advanced Satellite Multimedia Conference and 17th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - A Critical Look into Quantization Table Generalization Capabilities of CNN-based Double JPEG Compression Detection T2 - EUSIPCO Y1 - 2022 A1 - Elena Rodríguez-Lois A1 - David Vázquez-Padín A1 - Fernando Pérez-González A1 - Pedro Comesaña KW - Convolutional Neural Networks KW - Double JPEG compression KW - Image forensics KW - Source heterogeneity AB -
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.  
JF - EUSIPCO CY - Belgrade, Serbia ER - TY - CONF T1 - A Dynamic Codebook Design for Analog Beamforming in MIMO LEO Satellite Communications T2 - IEEE International Conference on Communications (ICC) Y1 - 2022 A1 - Joan Palacios A1 - Nuria González-Prelcic A1 - Carlos Mosquera JF - IEEE International Conference on Communications (ICC) ER - TY - JOUR T1 - Efficient protocols for oblivious linear function evaluation from ring-LWE JF - Journal of Computer Security Y1 - 2022 A1 - Carsten Baum A1 - Daniel Escudero A1 - Alberto Pedrouzo-Ulloa A1 - Peter Scholl A1 - Juan Ramón Troncoso-Pastoriza VL - 30 IS - 1 ER - TY - JOUR T1 - Flexible User Mapping for Radio Resource Assignment in Advanced Satellite Payloads JF - IEEE Transactions on Broadcasting Y1 - 2022 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha ER - TY - JOUR T1 - Full-duplex mmWave MIMO with finite-resolution phase shifters JF - IEEE Trans. Wireless Communications Y1 - 2022 A1 - R. López-Valcarce A1 - M. Martínez-Cotelo KW - full-duplex KW - mmWave KW - rodin AB -
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.
VL - 21 IS - 11 ER - TY - JOUR T1 - General Form of the Power Spectral Density of Multicarrier Signals JF - IEEE Communications Letters Y1 - 2022 A1 - R. López-Valcarce KW - rodin KW - spectrum shaping AB -
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.
VL - 26 IS - 8 ER - TY - CONF T1 - Gpu-Accelerated Sift-Aided Source Identification of Stabilized Videos T2 - 2022 IEEE International Conference on Image Processing (ICIP) Y1 - 2022 A1 - Montibeller, Andrea A1 - Pasquini, Cecilia A1 - Boato, Giulia A1 - Dell’Anna, Stefano A1 - Fernando Pérez-González KW - Codes KW - Deep Learning KW - estimation KW - forensics KW - GPU KW - Graphics processing units KW - Image processing KW - PRNU KW - SIFT KW - Video Source Identification KW - Video Stabilization KW - Visualization JF - 2022 IEEE International Conference on Image Processing (ICIP) UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9897579 ER - TY - JOUR T1 - Hybrid Beamforming Designs for Frequency-Selective mmWave MIMO Systems with Per-RF chain or Per-antenna Power Constraints JF - IEEE Trans. Wireless Communications Y1 - 2022 A1 - R. López-Valcarce A1 - Nuria González-Prelcic KW - mmWave KW - rodin AB -
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.
VL - 21 IS - 8 ER - TY - JOUR T1 - Joint Precoder and Window Design for OFDM Sidelobe Suppression JF - IEEE Communications Letters Y1 - 2022 A1 - Khawar Hussain A1 - R. López-Valcarce KW - rodin KW - spectrum shaping AB -

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.

VL - 26 IS - 12 ER - TY - CONF T1 - Orthogonal precoding with memory for sidelobe suppression in OFDM T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2022 A1 - Khawar Hussain A1 - R. López-Valcarce KW - rodin KW - spectrum shaping AB -
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.
JF - European Signal Processing Conference (EUSIPCO) ER - TY - CONF T1 - Secure Collaborative Camera Attribution T2 - European Interdisciplinary Cybersecurity Conference (EICC) Y1 - 2022 A1 - Alberto Pedrouzo-Ulloa A1 - Fernando Pérez-González A1 - David Vázquez-Padín JF - European Interdisciplinary Cybersecurity Conference (EICC) PB - ACM CY - Barcelona, Spain SN - 978-1-4503-9603-5 ER - TY - JOUR T1 - The SIMO Block Rayleigh Fading Channel Capacity Scaling With Number of Antennas, Bandwidth, and Coherence Length JF - IEEE Journal on Selected Areas in Information Theory Y1 - 2022 A1 - Gomez-Cuba, Felipe VL - 3 ER - TY - CONF T1 - Analog beamforming for full-duplex mmWave communication with low-resolution phase shifters T2 - IEEE International Conference on Communications (ICC) Y1 - 2021 A1 - R. López-Valcarce A1 - M. Martínez-Cotelo KW - full-duplex KW - mmWave KW - rodin AB -
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.
JF - IEEE International Conference on Communications (ICC) CY - Montreal, Canada (Virtual event) ER - TY - CONF T1 - Compressed Sensing Channel Estimation for OTFS Modulation in Non-Integer Delay-Doppler Domain T2 - 2021 IEEE Global Communications Conference (GLOBECOM) Y1 - 2021 A1 - Gomez-Cuba, Felipe JF - 2021 IEEE Global Communications Conference (GLOBECOM) ER - TY - CONF T1 - DNN Watermarking: Four Challenges and a Funeral T2 - 2021 ACM Workshop on Information Hiding and Multimedia Security, IH&MMSEC'21 Y1 - 2021 A1 - Barni, Mauro A1 - Fernando Pérez-González A1 - Tondi, Benedetta JF - 2021 ACM Workshop on Information Hiding and Multimedia Security, IH&MMSEC'21 CY - Virtual Event Belgium UR - http://dl.acm.org/citation.cfm?id=3460399 ER - TY - JOUR T1 - Editorial: Signal Processing for Beyond 5G Non-Terrestrial Networks JF - Frontiers in Space Technologies Y1 - 2021 A1 - Carlos Mosquera A1 - Pantelis-Daniel Arapoglou VL - 2 UR - https://www.frontiersin.org/articles/10.3389/frspt.2021.780171/full ER - TY - CONF T1 - Flexible Beam-User Mapping for Multibeam Satellites T2 - 9th European Signal Processing Conference, EUSIPCO 2021 Y1 - 2021 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha JF - 9th European Signal Processing Conference, EUSIPCO 2021 CY - Dublin, Irlanda ER - TY - CONF T1 - Full-stack Hybrid Beamforming in mmWave 5G Networks T2 - 2021 19th Mediterranean Communication and Computer Networking Conference (MedComNet) Y1 - 2021 A1 - Gomez-Cuba, Felipe A1 - Zugno, Tommaso A1 - Kim, Junseok A1 - Polese, Michele A1 - Bahk, Saewoong A1 - Zorzi, Michele JF - 2021 19th Mediterranean Communication and Computer Networking Conference (MedComNet) ER - TY - CONF T1 - Homomorphic SVM Inference for Fraud Detection T2 - VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) Y1 - 2021 A1 - Adrián Vázquez-Saavedra A1 - Gonzalo Jiménez-Balsa A1 - Jaime Loureiro-Acuña A1 - Manuel Fernández-Veiga A1 - Alberto Pedrouzo-Ulloa JF - VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) PB - Ediciones de la Universidad de Castilla-La Mancha U1 -

JNIC 2021 Best Short Paper Award

ER - TY - JOUR T1 - A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications JF - Frontiers in Space Technologies Y1 - 2021 A1 - Joan Palacios A1 - Nuria González-Prelcic A1 - Carlos Mosquera A1 - Takayuki Shimizu A1 - Chang-Heng Wang VL - 2 UR - https://www.frontiersin.org/articles/10.3389/frspt.2021.696464/full ER - TY - JOUR T1 - On the information leakage quantification of camera fingerprint estimates JF - Eurasip Journal on Information Security Y1 - 2021 A1 - Fernández-Menduiña, Samuel A1 - Fernando Pérez-González VL - 2021 UR - https://jis-eurasipjournals.springeropen.com/articles/10.1186/s13635-021-00121-6 IS - 6 ER - TY - JOUR T1 - Mask-Compliant Orthogonal Precoding for Spectrally Efficient OFDM JF - IEEE Transactions on Communications Y1 - 2021 A1 - Ravinder Kumar A1 - Khawar Hussain A1 - R. López-Valcarce KW - rodin KW - spectrum shaping KW - winter AB -
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.
VL - 69 IS - 3 ER - TY - CONF T1 - Memory Tricks: Improving Active Interference Cancellation for Out-of-Band power reduction in OFDM T2 - IEEE Int. Workshop Signal Process. Adv. Wireless Commun. (SPAWC) Y1 - 2021 A1 - Khawar Hussain A1 - R. López-Valcarce KW - rodin KW - spectrum shaping AB -

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.

JF - IEEE Int. Workshop Signal Process. Adv. Wireless Commun. (SPAWC) CY - Lucca, Italy (Virtual event) ER - TY - JOUR T1 - Multiquadratic rings and oblivious linear function evaluation JF - TEMat monográficos Y1 - 2021 A1 - Alberto Pedrouzo-Ulloa VL - 2 UR - https://temat.es/monograficos/article/view/vol2-p83 IS - Proceedings of the 3rd BYMAT Conference ER - TY - CONF T1 - Non-Orthogonal Transmission Under Flexible Illumination Patterns For Advanced Satellite Payloads T2 - 38th International Communications Satellite Systems Conference (ICSSC), Y1 - 2021 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha JF - 38th International Communications Satellite Systems Conference (ICSSC), CY - Washington DC, USA ER - TY - CONF T1 - PRNU-leaks: facts and remedies T2 - 2020 28th European Signal Processing Conference (EUSIPCO) Y1 - 2021 A1 - Fernando Pérez-González A1 - Fernández-Menduiña, Samuel KW - Degradation KW - estimation KW - Europe KW - Fingerprint KW - Fingerprint recognition KW - forensics KW - information theory KW - Leakage KW - Membership inference KW - privacy KW - PRNU KW - Signal processing JF - 2020 28th European Signal Processing Conference (EUSIPCO) UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9287451 ER - TY - CONF T1 - A Review of "Camera Attribution Forensic Analyzer in the Encrypted Domain" T2 - VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) Y1 - 2021 A1 - Alberto Pedrouzo-Ulloa A1 - Miguel Masciopinto A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González JF - VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) PB - Ediciones de la Universidad de Castilla-La Mancha U1 -

JNIC 2021 Best Extended Abstract Paper Award

ER - TY - JOUR T1 - Revisiting multivariate ring learning with errors and its applications on lattice-based cryptography JF - Mathematics Y1 - 2021 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Nicolas Gama A1 - Mariya Georgieva A1 - Fernando Pérez-González VL - 9 IS - 8 ER - TY - JOUR T1 - Space-Time Rate Splitting for the MISO BC with Magnitude CSIT JF - IEEE Transactions on Communications Y1 - 2021 A1 - Carlos Mosquera A1 - Nele Noels A1 - Tomás Ramírez A1 - Màrius Caus A1 - Adriano Pastore ER - TY - JOUR T1 - Adam and the Ants: On the Influence of the Optimization Algorithm on the Detectability of DNN Watermarks Y1 - 2020 A1 - Cortiñas-Lorenzo, Betty A1 - Fernando Pérez-González VL - 22 UR - https://www.mdpi.com/1099-4300/22/12/1379 IS - 12 ER - TY - CONF T1 - Efficient Protocols for Oblivious Linear Function Evaluation from Ring-LWE T2 - International Conference on Security and Cryptography for Networks (SCN) Y1 - 2020 A1 - Carsten Baum A1 - Daniel Escudero A1 - Alberto Pedrouzo-Ulloa A1 - Peter Scholl A1 - Juan Ramón Troncoso-Pastoriza JF - International Conference on Security and Cryptography for Networks (SCN) PB - Springer ER - TY - CONF T1 - Energy-efficient analog beamforming with short packets in millimeter-wave MIMO systems T2 - 2020 54th Asilomar Conference on Signals, Systems, and Computers, California, 2020 Y1 - 2020 A1 - Jordi Borràs A1 - Francesc Molina A1 - R. López-Valcarce A1 - Josep Sala KW - mmWave KW - rodin AB -
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.
JF - 2020 54th Asilomar Conference on Signals, Systems, and Computers, California, 2020 CY - Virtual event ER - TY - CONF T1 - Full-Duplex mmWave Communication with Hybrid Precoding and Combining T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2020 A1 - R. López-Valcarce A1 - M. Martínez-Cotelo KW - full-duplex KW - mmWave KW - rodin KW - winter AB -
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.
JF - European Signal Processing Conference (EUSIPCO) CY - Amsterdam (Netherlands) ER - TY - JOUR T1 - Link Adaptation and SINR errors in Practical Multicast Multibeam Satellite Systems with Linear Precoding JF - International Journal of Satellite Communications and Networking Y1 - 2020 A1 - Anxo Tato A1 - Stefano Andrenacci A1 - Eva Lagunas A1 - Symeon Chatzinotas A1 - Carlos Mosquera KW - link adaptation KW - multi-beam satellite KW - precoding KW - satellite communications ER - TY - CONF T1 - Multiquadratic Rings and Walsh-Hadamard Transforms for Oblivious Linear Function Evaluation T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2020 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Nicolas Gama A1 - Mariya Georgieva A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE ER - TY - JOUR T1 - Neural Network Aided Computation of Mutual Information for Adaptation of Spatial Modulation JF - IEEE Transactions on Communications Y1 - 2020 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez Neira KW - ACM KW - Adaptive Communications KW - Capacity KW - Index Modulation KW - link adaptation KW - Machine Learning KW - MFNN KW - Mutual Information KW - neural networks KW - Polarized Modulation KW - Spatial Modulation AB -

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.

SN - 1558-0857 ER - TY - CONF T1 - Non-coherent rate-splitting for multibeam satellite forward link: practical coding and decoding algorithms T2 - IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 25-28 May 2020, virtual event. Y1 - 2020 A1 - Nele Noels A1 - Marc Moeneclaey A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore JF - IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 25-28 May 2020, virtual event. ER - TY - CONF T1 - Optimal window design for W-OFDM T2 - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2020 A1 - Khawar Hussain A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -
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.
JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) U1 -

Accepted.

ER - TY - CONF T1 - On the Performance of Advanced Reflectarray Configurations for Multibeam Satellite Communications T2 - XXXV Simposio Nacional de la Unión Científica Internacional de Radio, URSI 2020 Y1 - 2020 A1 - Tomás Ramírez A1 - Daniel Martínez de Rioja A1 - Eduardo Martínez de Rioja A1 - Carlos Mosquera A1 - José A. Encinar JF - XXXV Simposio Nacional de la Unión Científica Internacional de Radio, URSI 2020 ER - TY - CONF T1 - PRNU-leaks: facts and remedies T2 - 2020 28th European Signal Processing Conference (EUSIPCO) Y1 - 2020 A1 - Fernando Pérez-González A1 - Fernández-Menduiña, Samuel JF - 2020 28th European Signal Processing Conference (EUSIPCO) CY - Virtual Event Amsterdam UR - https://ieeexplore.ieee.org/document/9287451 ER - TY - CONF T1 - Resource Management in the multibeam NOMA-based satellite downlink T2 - 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera JF - 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) ER - TY - CONF T1 - Robustness analysis of beamforming based designs for mmWave Full-Duplex Amplify-and-Forward relays T2 - 2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS) Y1 - 2020 A1 - R. López-Valcarce A1 - M. Martínez-Cotelo KW - full-duplex KW - mmWave KW - rodin AB -
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.
JF - 2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS) ER - TY - CONF T1 - Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals T2 - 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nele Noels A1 - Màrius Caus A1 - Joan Bas A1 - Luis Blanco A1 - Nader Alagha JF - 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) ER - TY - THES T1 - Synthesis of multiaxis stationary non-Gaussian shaped vibration Y1 - 2020 A1 - Damián González KW - multiaxial vibration KW - random vibration KW - vibration synthesis AB -
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.
PB - University of Vigo CY - Vigo ER - TY - JOUR T1 - Temporal Localization of Non-Static Digital Videos Using the Electrical Network Frequency JF - IEEE Signal Processing Letters Y1 - 2020 A1 - Fernández-Menduiña, Samuel A1 - Fernando Pérez-González VL - 27 UR - https://ieeexplore.ieee.org/document/9072308 ER - TY - JOUR T1 - Two-Level Frame Precoding with non-Cooperative Gateways JF - EURASIP Journal on Wireless Communications and Networking Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - R. López-Valcarce KW - myrada KW - satcom KW - winter UR - https://rdcu.be/b5KB3 ER - TY - JOUR T1 - Video Integrity Verification and GOP Size Estimation via Generalized Variation of Prediction Footprint JF - IEEE Transactions on Information Forensics and Security Y1 - 2020 A1 - David Vázquez-Padín A1 - Marco Fontani A1 - Dasara Shullani A1 - Fernando Pérez-González A1 - Alessandro Piva A1 - Mauro Barni KW - B-frames KW - double compression detection KW - GOP size estimation KW - rate distortion optimization KW - video forensics AB -

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.

VL - 15 IS - 1 ER - TY - CONF T1 - Analog beamforming for full-duplex millimeter wave communication T2 - 16th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2019 A1 - R. López-Valcarce A1 - Nuria González-Prelcic KW - full-duplex KW - mmWave KW - winter AB -

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.

JF - 16th International Symposium on Wireless Communication Systems (ISWCS) CY - Oulu, Finland ER - TY - CONF T1 - Beamformer design for full-duplex amplify-and-forward millimeter wave relays T2 - 16th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2019 A1 - R. López-Valcarce A1 - Nuria González-Prelcic KW - full-duplex KW - mmWave KW - winter AB -

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.

JF - 16th International Symposium on Wireless Communication Systems (ISWCS) CY - Oulu, Finland ER - TY - JOUR T1 - Capacity scaling in a non-coherent wideband massive SIMO block fading channel JF - IEEE Transactions on Wireless Communications Y1 - 2019 A1 - Gomez-Cuba, Felipe A1 - Chowdhury, Mainak A1 - Manolakos, Alexandros A1 - Erkip, Elza A1 - Goldsmith, Andrea J VL - 18 ER - TY - CONF T1 - Deep Learning Assisted Rate Adaptation in Spatial Modulation Links T2 - 16th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera KW - Deep Learning KW - link adaptation KW - Machine Learning KW - Spatial Modulation AB -

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.

JF - 16th International Symposium on Wireless Communication Systems (ISWCS) CY - Oulu (Finland) ER - TY - CONF T1 - Dynamic Attribute-Based Privacy-Preserving Genomic Susceptibility Testing T2 - 34th Annual ACM Symposium on Applied Computing, SAC 2019 Y1 - 2019 A1 - Mina Namazi A1 - Cihan Eryonucu A1 - Erman Ayday A1 - Fernando Pérez-González JF - 34th Annual ACM Symposium on Applied Computing, SAC 2019 CY - Limassol, Cyprus ER - TY - CONF T1 - Efficient PRNU Matching in the Encrypted Domain T2 - XoveTIC Y1 - 2019 A1 - Alberto Pedrouzo-Ulloa A1 - Miguel Masciopinto A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - camera attribution forensic analyzer KW - digital media forensics KW - lattice-based cryptosystems KW - Photoresponse Non-Uniformity JF - XoveTIC PB - MDPI CY - A Coruña, Spain ER - TY - CHAP T1 - Expectation–maximisation based distributed estimation in sensor networks T2 - Data Fusion in Wireless Sensor Networks: A statistical signal processing perspective Y1 - 2019 A1 - R. López-Valcarce A1 - Alba Pagès-Zamora KW - winter KW - wsn AB -

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.

JF - Data Fusion in Wireless Sensor Networks: A statistical signal processing perspective PB - The Institution of Engineering and Technology (IET) CY - London, UK SN - 978-1-78561-584-9 ER - TY - CONF T1 - Flexible spectral precoding for OFDM systems T2 - 2nd XoveTIC Conference Y1 - 2019 A1 - Khawar Hussain A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -
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
JF - 2nd XoveTIC Conference CY - A Coruña (Spain) ER - TY - CONF T1 - Flexible spectral precoding for sidelobe suppression in OFDM systems T2 - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2019 A1 - Khawar Hussain A1 - Ana Lojo A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -

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.

JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Brighton, UK ER - TY - CONF T1 - Frequency-selective hybrid precoding and combining for mmWave MIMO systems with per-antenna power constraints T2 - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2019 A1 - Javier Rodríguez-Fernández A1 - R. López-Valcarce A1 - Nuria González-Prelcic KW - mmWave KW - winter AB -

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.

JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Brighton, UK ER - TY - THES T1 - Homomorphic Lattice Cryptosystems for Secure Signal Processing Y1 - 2019 A1 - Alberto Pedrouzo-Ulloa PB - University of Vigo CY - Vigo ER - TY - JOUR T1 - Improving PRNU Compression Through Preprocessing, Quantization, and Coding JF - IEEE Transactions on Information Forensics and Security Y1 - 2019 A1 - L. Bondi A1 - P. Bestagini A1 - Fernando Pérez-González A1 - S. Tubaro VL - 14 IS - 3 ER - TY - THES T1 - Link Adaptation Techniques for Future Terrestrial and Satellite Communications T2 - Universidade de Vigo Y1 - 2019 A1 - Anxo Tato AB -

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.

JF - Universidade de Vigo ER - TY - CONF T1 - Low-rank data matrix recovery with missing values and faulty sensors T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2019 A1 - R. López-Valcarce A1 - Josep Sala KW - winter KW - wsn AB -

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.

JF - European Signal Processing Conference (EUSIPCO) CY - A Coruña, Spain ER - TY - JOUR T1 - Maximally stationary window design for overlap-add based random vibration synthesis JF - Mechanical Systems and Signal Processing Y1 - 2019 A1 - Damián González A1 - R. López-Valcarce KW - random vibration AB -
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.
VL - 122 ER - TY - JOUR T1 - MMSE filter design for Full-Duplex filter-and-forward MIMO relays under limited dynamic range JF - Signal Processing Y1 - 2019 A1 - Emilio Antonio-Rodríguez A1 - Stefan Werner A1 - R. López-Valcarce A1 - Risto Wichman KW - adaptive signal processing KW - full-duplex KW - winter AB -
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.
VL - 156 ER - TY - CONF T1 - Neural Network Aided Computation of Generalized Spatial Modulation Capacity T2 - 27th European Signal Processing Conference (EUSIPCO) Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez-Neira KW - Generalized Spatial Modulation KW - Index Modulations KW - Machine Learning KW - Multilayer Feedforward Neural Network KW - Polarized Modulation AB -

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.

JF - 27th European Signal Processing Conference (EUSIPCO) CY - A Coruña (Spain) ER - TY - CONF T1 - OFDM spectral precoding with per-subcarrier distortion constraints T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2019 A1 - Khawar Hussain A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -
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.
JF - European Signal Processing Conference (EUSIPCO) CY - A Coruña, Spain ER - TY - JOUR T1 - Partial-Duplex Amplify-and-Forward Relaying: Spectral Efficiency Analysis under Self-Interference JF - IEEE Transactions on Wireless Communications Y1 - 2019 A1 - R. López-Valcarce A1 - C. Mosquera KW - full-duplex KW - myrada KW - winter AB -
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.
VL - 18 IS - 4 ER - TY - CONF T1 - Prediction Residue Analysis in MPEG-2 Double Compressed Video Sequences T2 - EUSIPCO Y1 - 2019 A1 - David Vázquez-Padín A1 - Fernando Pérez-González KW - double compression detection KW - GOP size estimation KW - MPEG-2 KW - prediction residue analysis KW - video forensics AB -

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.

JF - EUSIPCO CY - A Coruña, Spain ER - TY - CONF T1 - Rethinking Location Privacy for Unknown Mobility Behaviors T2 - IEEE European Symposium on Security and Privacy (EuroS&P) Y1 - 2019 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González JF - IEEE European Symposium on Security and Privacy (EuroS&P) ER - TY - CONF T1 - Revisiting Multivariate Lattices for Encrypted Signal Processing T2 - ACM Information Hiding and Multimedia Security Workshop (IH&MMSec) Y1 - 2019 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - homomorphic encryption KW - Lattice-Based Cryptography KW - Multidimensional Signal Processing KW - Secure Signal Processing JF - ACM Information Hiding and Multimedia Security Workshop (IH&MMSec) PB - ACM CY - Paris, France ER - TY - Generic T1 - Solving self-interference issues in a Full-Duplex radio transceiver T2 - 2nd XoveTIC Conference Y1 - 2019 A1 - Miguel Franco-Martinez A1 - Francisco-Javier Martinez-Alonso A1 - R. López-Valcarce KW - adaptive signal processing KW - full-duplex KW - winter AB -
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.
JF - 2nd XoveTIC Conference CY - A Coruña (Spain) ER - TY - CONF T1 - Spatial Modulation for Beyond 5G Communications: Capacity Calculation and Link Adaptation T2 - 2nd XoveTIC Conference Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera KW - 5G KW - adaptive coding and modulation KW - Deep Learning KW - link adaptation KW - Machine Learning KW - neural networks KW - Spatial Modulation JF - 2nd XoveTIC Conference CY - A Coruña (Spain) ER - TY - CONF T1 - Spatial Modulation Link Adaptation: a Deep Learning Approach T2 - 2019 53rd Asilomar Conference on Signals, Systems, and Computers Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera JF - 2019 53rd Asilomar Conference on Signals, Systems, and Computers CY - California ER - TY - THES T1 - A Statistical Approach to the Design of Privacy-Preserving Services Y1 - 2019 A1 - Simon Oya ER - TY - RPRT T1 - Technical Report: MPEG-2 Prediction Residue Analysis Y1 - 2019 A1 - David Vázquez-Padín A1 - Fernando Pérez-González PB - University of Vigo ER - TY - CONF T1 - Adjacent Beams Resource Sharing to Serve Hot Spots : A Rate Splitting Approach T2 - 36th International Communications Satellite Systems Conference (ICSSC) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore A1 - Nader Alagha A1 - Nele Noels AB -
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.
JF - 36th International Communications Satellite Systems Conference (ICSSC) CY - Niagara Falls, Canada ER - TY - CONF T1 - Camera Attribution Forensic Analyzer in the Encrypted Domain T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2018 A1 - Alberto Pedrouzo-Ulloa A1 - Miguel Masciopinto A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Hong Kong U1 -

IEEE WIFS 2018 Best Paper Award

ER - TY - JOUR T1 - Capacity Scaling of Cellular Networks: Impact of Bandwidth, Infrastructure Density and Number of Antennas JF - IEEE Transactions on Wireless Communications Y1 - 2018 A1 - Gomez-Cuba, F A1 - Erkip, E A1 - Rangan, S A1 - Gonzalez-Castano, F J KW - Ad hoc networks KW - Analytical models KW - antenna arrays KW - Bandwidth KW - bandwidth scaling limit KW - capacity scaling laws KW - Cellular networks KW - cellular radio KW - cooperative communication KW - millimeter wave bands KW - millimetre wave antenna arrays KW - millimetre wave communication KW - multihop protocol KW - next generation networks KW - next-generation cellular networks KW - protocols KW - radio spectrum management KW - relay networks (telecommunication) KW - Wideband regime KW - Wireless communication VL - 17 ER - TY - CONF T1 - Channel dependent Mutual Information in Index Modulations T2 - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing Y1 - 2018 A1 - Pol Henarejos A1 - Ana Pérez-Neira A1 - Anxo Tato A1 - Carlos Mosquera AB -

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.

JF - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing ER - TY - JOUR T1 - Distributed Precoding Systems in Multi-Gateway Multibeam Satellites: Regularization and Coarse Beamforming JF - IEEE Transactions on Wireless Communication Y1 - 2018 A1 - Carlos Mosquera A1 - R. López-Valcarce A1 - Tomás Ramírez A1 - Vahid Joroughi ER - TY - CONF T1 - Exploratory Analysis of Superposition Coding and Rate Splitting for Multibeam Satellite Systems T2 - 15th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2018 A1 - Màrius Caus A1 - Adriano Pastore A1 - Mònica Navarro A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nele Noels A1 - Nader Alagha A1 - Ana I. Perez-Neira JF - 15th International Symposium on Wireless Communication Systems (ISWCS) CY - Lisbon, Portugal ER - TY - CONF T1 - Link Adaptation and Carriers Detection Errors in Multibeam Satellite Systems with Linear Precoding T2 - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2018 A1 - Anxo Tato A1 - Stefano Andrenacci A1 - Chatzinotas, S. A1 - Carlos Mosquera AB -

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.
 

JF - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) CY - Berlin, Germany ER - TY - CONF T1 - Locally optimal invariant detector for testing equality of two power spectral densities T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2018 A1 - David Ramírez A1 - Daniel Romero A1 - Javier Vía A1 - R. López-Valcarce A1 - Ignacio Santamaría KW - cognitive radio KW - winter AB -
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.
JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) CY - Calgary, Canada ER - TY - CONF T1 - Message-Splitting for Interference Cancellation in Multibeam Satellite Systems T2 - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore A1 - Mònica Navarro A1 - Nele Noels JF - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) CY - Berlin, Germany ER - TY - JOUR T1 - Parameter estimation in wireless sensor networks with faulty transducers: A distributed EM approach JF - Signal Processing Y1 - 2018 A1 - Silvana Silva Pereira A1 - R. López-Valcarce A1 - Alba Pagès-Zamora KW - winter KW - wsn AB -

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.

VL - 144 UR - https://authors.elsevier.com/a/1W90XbZX4rsob ER - TY - CONF T1 - Practical Implementation of Link Adaptation with Dual Polarized Modulation (Best paper award) T2 - 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. Y1 - 2018 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez-Neira JF - 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. U1 -

Best paper award

ER - TY - CONF T1 - Putting the PRNU Model in Reverse Gear: Findings with Synthetic Signals T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2018 A1 - Miguel Masciopinto A1 - Fernando Pérez-González JF - European Signal Processing Conference (EUSIPCO) CY - Rome, Italy ER - TY - Generic T1 - Software Defined Radio: A Brief Introduction T2 - XoveTIC Congress Y1 - 2018 A1 - Anxo Tato AB -

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.

JF - XoveTIC Congress PB - MDPI CY - A Coruña, Spain UR - https://www.mdpi.com/2504-3900/2/18/1196 ER - TY - CONF T1 - Spectral and statistical evaluation of the properties of the vibration measured at the base of an automotive seat for non-Gaussian random noise synthesis T2 - Int. Conf. on Noise and Vibration Engineering, ISMA-USD 2018 Y1 - 2018 A1 - Damián González A1 - R. López-Valcarce KW - random vibration AB -
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.
JF - Int. Conf. on Noise and Vibration Engineering, ISMA-USD 2018 CY - Leuven, Belgium ER - TY - CONF T1 - Symbol-Asynchronous Transmission In Multibeam Satellite User Down-Link: Rate Regions For Novel Superposition Coding Schemes T2 - 6th IEEE Global Conference on Signal and Information Processing Y1 - 2018 A1 - Nele Noels A1 - Marc Moeneclaey A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore AB -

We consider the forward link of a multibeam satellite system with high spectral reuse and the novel low-complexity transmission and detection strategies from ["“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.

JF - 6th IEEE Global Conference on Signal and Information Processing ER - TY - JOUR T1 - Testing equality of multiple power spectral density matrices JF - IEEE Trans. Signal Processing Y1 - 2018 A1 - David Ramírez A1 - Daniel Romero A1 - Javier Vía A1 - R. López-Valcarce A1 - Ignacio Santamaría KW - cognitive radio KW - winter VL - 66 IS - 23 ER - TY - CONF T1 - Two-Level Precoding for High Throughput Satellites with non-Cooperative Gateways T2 - 22nd International Workshop on Smart Antennas (WSA) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Roberto López-Valcarce JF - 22nd International Workshop on Smart Antennas (WSA) ER - TY - CONF T1 - Back to the Drawing Board: Revisiting the Design of Optimal Location Privacy-preserving Mechanisms T2 - ACM Conference on Computer and Communications Security (CCS) Y1 - 2017 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González JF - ACM Conference on Computer and Communications Security (CCS) ER - TY - CONF T1 - Bit allocation for increased power efficiency in 5G receivers with variable-resolution ADCs T2 - 2017 Information Theory and Applications Workshop (ITA) Y1 - 2017 A1 - b. Abbas, W A1 - Gomez-Cuba, F A1 - Zorzi, M KW - 5G mobile communication KW - analogue-digital conversio JF - 2017 Information Theory and Applications Workshop (ITA) ER - TY - JOUR T1 - CDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation JF - Digital Signal Processing Y1 - 2017 A1 - Fernando J. Alvarez A1 - Teodoro Aguilera A1 - R. López-Valcarce KW - compass KW - wsn AB -
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.
VL - 62 ER - TY - CONF T1 - Defending Surveillance Sensor Networks Against Data-Injection Attacks via Trusted Nodes T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2017 A1 - R. López-Valcarce A1 - Daniel Romero KW - winter KW - wsn AB -
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.
JF - European Signal Processing Conference (EUSIPCO) CY - Kos Island, Greece ER - TY - CONF T1 - Design of projection matrices for PRNU compression T2 - 2017 IEEE Workshop on Information Forensics and Security (WIFS) Y1 - 2017 A1 - L. Bondi A1 - Fernando Pérez-González A1 - P. Bestagini A1 - S. Tubaro KW - acquisition time KW - cameras KW - computational complexity KW - data compression KW - defacto standard KW - design methodology KW - digital photo KW - forensics investigators KW - image coding KW - Image forensics KW - image sensors KW - image source identification KW - interpolation KW - matrix algebra KW - nearly-flat spectral characteristics KW - Performance evaluation KW - photo response nonuniformity KW - PRNU compression KW - probability KW - projection matrices KW - public image dataset KW - Signal to noise ratio KW - silicon sensor imperfections KW - specific camera sensor KW - weak multiplicative noise JF - 2017 IEEE Workshop on Information Forensics and Security (WIFS) ER - TY - CONF T1 - Distributed Precoding Systems in Multi-Gateway Multibeam Satellites T2 - 35th AIAA International Communications Satellite Systems Conference Y1 - 2017 A1 - Carlos Mosquera A1 - R. López-Valcarce A1 - Tomás Ramírez KW - precoding KW - satcom JF - 35th AIAA International Communications Satellite Systems Conference CY - Trieste,Italy ER - TY - JOUR T1 - FER Estimation in a Memoryless BSC with Variable Frame Length and Unreliable ACK/NAK Feedback JF - IEEE Transactions on Wireless Communications Y1 - 2017 A1 - Alberto Rico-Alvariño A1 - R. López-Valcarce A1 - Carlos Mosquera A1 - Robert W. Heath Jr. KW - adaptive signal processing KW - compass KW - Cramér-Rao bound (CRB) KW - frame error rate KW - myrada KW - winter AB -
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.
VL - 16 IS - 6 ER - TY - CONF T1 - Filter design for delay-based anonymous communications T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2017 A1 - Simon Oya A1 - Fernando Pérez-González A1 - Carmela Troncoso KW - adversarial signal processing KW - compass KW - Multimedia security KW - winter JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) ER - TY - CONF T1 - Is Geo-Indistinguishability what you are looking for? T2 - Workshop on Privacy in the Electronic Society (WPES) Y1 - 2017 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González KW - adversarial signal processing KW - Multimedia security KW - winter JF - Workshop on Privacy in the Electronic Society (WPES) ER - TY - JOUR T1 - Learning Power Spectrum Maps from Quantized Power Measurements JF - IEEE Transactions on Signal Processing Y1 - 2017 A1 - Daniel Romero A1 - Seung-Jun Kim A1 - Georgios Giannakis A1 - R. López-Valcarce KW - cognitive radio KW - compass KW - compressed sensing KW - spectrum sensing KW - winter KW - wsn AB -
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. 
VL - 65 IS - 10 ER - TY - Generic T1 - Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems T2 - 9th EAI International Conference on Wireless and Satellite Systems, WISATS Y1 - 2017 A1 - Anxo Tato A1 - Pol Henarejos A1 - Carlos Mosquera A1 - Ana Pérez-Neira AB -

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.

JF - 9th EAI International Conference on Wireless and Satellite Systems, WISATS PB - Springer International Publishing CY - Oxford VL - Wireless and Satellite Systems ER - TY - CONF T1 - Millimeter Wave Receiver Comparison Under Energy vs Spectral Efficiency Trade-off T2 - European Wireless 2017; 23th European Wireless Conference Y1 - 2017 A1 - Abbas, W B A1 - Gomez-Cuba, F A1 - Zorzi, M JF - European Wireless 2017; 23th European Wireless Conference ER - TY - JOUR T1 - Number Theoretic Transforms for Secure Signal Processing JF - IEEE Transactions on Information Forensics and Security Y1 - 2017 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - lattice cryptography KW - Multimedia security KW - Number Theoretic Transforms KW - Secure Signal Processing KW - Signal Processing in the Encrypted Domain KW - Somewhat Homomorphic Encryption KW - winter VL - 12 IS - 5 ER - TY - JOUR T1 - A Random Matrix Approach to the Forensic Analysis of Upscaled Images JF - IEEE Transactions on Information Forensics and Security Y1 - 2017 A1 - David Vázquez-Padín A1 - Fernando Pérez-González A1 - Pedro Comesaña KW - Multimedia security KW - winter VL - 12 IS - 9 ER - TY - CONF T1 - Random Matrix Theory for Modeling the Eigenvalue Distribution of Images under Upscaling T2 - International Tyrrhenian Workshop on Digital Communication 2017 Y1 - 2017 A1 - David Vázquez-Padín A1 - Fernando Pérez-González A1 - Pedro Comesaña KW - Multimedia security KW - winter AB -

 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.

JF - International Tyrrhenian Workshop on Digital Communication 2017 PB - Springer International Publishing CY - Palermo, Italy ER - TY - CONF T1 - Robust clustering of data collected via crowdsourcing T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2017 A1 - Alba Pagès-Zamora A1 - Georgios Giannakis A1 - R. López-Valcarce A1 - Pere Gimenez-Febrer KW - winter KW - wsn AB -

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.

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) CY - New Orleans ER - TY - CONF T1 - Secure Genomic Susceptibility Testing based on Lattice Encryption T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2017 A1 - Juan Ramón Troncoso-Pastoriza A1 - Alberto Pedrouzo-Ulloa A1 - Fernando Pérez-González KW - adversarial signal processing KW - compass KW - Genomic Privacy KW - homomorphic encryption KW - Lattice-Based Cryptography KW - Privacy Protection JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - New Orleans, USA ER - TY - JOUR T1 - Smart Detection of Line-Search Oracle Attacks JF - IEEE Transactions on Information Forensics and Security Y1 - 2017 A1 - Tondi, Benedetta A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Barni, Mauro VL - 12 IS - 3 ER - TY - JOUR T1 - Statistical detection of JPEG traces in digital images in uncompressed formats JF - IEEE Transactions on Information Forensics and Security Y1 - 2017 A1 - Cecilia Pasquini A1 - Giulia Boato A1 - Fernando Pérez-González VL - 12 IS - Pending ER - TY - RPRT T1 - Technical Report UV-TSC-DVP-19042017: Derivation of the Asymptotic Eigenvalue Distribution for Causal 2D-AR Models under Upscaling Y1 - 2017 A1 - David Vázquez-Padín A1 - Fernando Pérez-González A1 - Pedro Comesaña PB - University of Vigo ER - TY - CONF T1 - Time-domain channel estimation for wideband millimeter wave systems with hybrid architecture T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2017 A1 - Kiran Venugopal A1 - Ahmed Alkhateeb A1 - Robert W. Heath Jr. A1 - Nuria González-Prelcic KW - compass KW - mmWave KW - myrada AB -

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.

JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - JOUR T1 - Wideband full-duplex MIMO relays with blind adaptive self-interference cancellation JF - Signal Processing Y1 - 2017 A1 - Emilio Antonio-Rodríguez A1 - Stefan Werner A1 - R. López-Valcarce A1 - Taneli Riihonen A1 - Risto Wichman KW - adaptive signal processing KW - compass KW - full duplex KW - winter AB -
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.
VL - 130 ER - TY - CONF T1 - Advanced Signal Processing Techniques for Fixed and Mobile Satellite Communications T2 - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Pol Henarejos A1 - Ana Pérez-Neira A1 - Nicolò Mazzali A1 - Carlos Mosquera KW - compass KW - full duplex KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - Array thinnig for antenna selection in millimeter wave MIMO systems T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2016 A1 - C. Rusu A1 - Nuria González-Prelcic A1 - R. W. Heath Jr KW - compass KW - mmWave JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) ER - TY - CONF T1 - Bandwidth Allocation in Partial Duplex Relaying T2 - The 17th IEEE International workshop on Signal Processing advances in Wireless Communications (SPAWC) Y1 - 2016 A1 - Carlos Mosquera A1 - R. López-Valcarce KW - compass KW - full duplex KW - relay JF - The 17th IEEE International workshop on Signal Processing advances in Wireless Communications (SPAWC) CY - Edinburgh, UK ER - TY - CONF T1 - Co-creating Security-and-Privacy-by-Design Systems T2 - International Conference on Availability, Reliability and Security (ARES) Y1 - 2016 A1 - Sauro Vicini A1 - Francesco Alberti A1 - Nicolás Notario A1 - Alberto Crespo A1 - Juan Ramón Troncoso-Pastoriza A1 - Alberto Sanna JF - International Conference on Availability, Reliability and Security (ARES) CY - Salzburg, Germany ER - TY - JOUR T1 - Compressive Covariance Sensing: Structure-Based Compressive Sensing Beyond Sparsity JF - IEEE Signal Processing Magazine Y1 - 2016 A1 - Daniel Romero A1 - Dyonisius D Ariananda A1 - Zhi Tian A1 - Geert Leus KW - compass KW - compressed sensing AB -
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.
VL - 33 IS - 1 ER - TY - JOUR T1 - Data Hiding Robust to Mobile Communication Vocoders JF - IEEE Transactions on Multimedia Y1 - 2016 A1 - Reza Kazemi A1 - Fernando Pérez-González A1 - Mohamed Ali Akhaee A1 - Fereydoon Behnia VL - 18 IS - 12 ER - TY - CONF T1 - Design of data-injection adversarial attacks against spatial field detectors T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2016 A1 - R. López-Valcarce A1 - Daniel Romero KW - adversarial signal processing KW - compass KW - wsn AB -

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.

JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Palma de Mallorca, Spain ER - TY - JOUR T1 - Design of pool mixes against profiling attacks in real conditions JF - IEEE/ACM Transactions on Networking Y1 - 2016 A1 - Simon Oya A1 - Fernando Pérez-González A1 - Carmela Troncoso KW - adversarial signal processing KW - compass VL - 24 IS - 6 ER - TY - JOUR T1 - Designing incoherent frames through convex techniques for optimized compressed sensing JF - IEEE Transactions on Signal Processing Y1 - 2016 A1 - Cristian Rusu A1 - Nuria González-Prelcic KW - compass KW - compressed sensing VL - 64 IS - 9 ER - TY - THES T1 - Detection of Image Resampling and Video Encoding Footprints for Forensic Applications Y1 - 2016 A1 - David Vázquez-Padín PB - University of Vigo CY - Vigo ER - TY - CONF T1 - Distributed multivariate regression with unknown noise covariance in the presence of outliers: a minimum description length approach T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2016 A1 - R. López-Valcarce A1 - Daniel Romero A1 - Josep Sala A1 - Alba Pagès-Zamora KW - compass KW - wsn AB -
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.
JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Palma de Mallorca, Spain ER - TY - CONF T1 - Dynamic Privacy-Preserving Genomic Susceptibility Testing T2 - ACM Workshop on Information Hiding and Multimedia Security Y1 - 2016 A1 - Mina Namazi A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González JF - ACM Workshop on Information Hiding and Multimedia Security ER - TY - CONF T1 - Estimating millimeter wave channels using out-of-band measurements T2 - Information Theory and Applications Workshop (ITA Y1 - 2016 A1 - Anum Ali A1 - Nuria González-Prelcic A1 - R.W. Heath Jr. KW - compass KW - mmWave JF - Information Theory and Applications Workshop (ITA ER - TY - JOUR T1 - Fast orthonormal sparsifying transforms based on Householder reflectors JF - IEEE Transactions on Signal Processing Y1 - 2016 A1 - C. Rusu A1 - Nuria González-Prelcic A1 - R.W. Heath Jr. KW - compass KW - compressed sensing VL - 64 IS - 24 ER - TY - CONF T1 - Fast Sequential Forensic Detection of Camera Fingerprint T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2016 A1 - Fernando Pérez-González A1 - Miguel Masciopinto A1 - Iria González-Iglesias A1 - Pedro Comesaña JF - IEEE International Conference on Image Processing (ICIP) ER - TY - THES T1 - Flat Fading Channel Estimation Based on Dirty Paper Coding Y1 - 2016 A1 - Gabriel Domínguez-Conde PB - University of Vigo CY - Vigo ER - TY - CONF T1 - Forensics of high quality and nearly identical JPEG image recompression T2 - ACM Workshop on Information Hiding and Multimedia Security Y1 - 2016 A1 - Cecilia Pasquini A1 - Pascal Schoettle A1 - Rainer Bohme A1 - Giulia Boato A1 - Fernando Pérez-González JF - ACM Workshop on Information Hiding and Multimedia Security ER - TY - CONF T1 - Frequency selective multiuser hybrid precoding for mmWave systems with imperfect channel knowledge T2 - Asilomar Conf. on Signals, Systems and Computers Y1 - 2016 A1 - Jose P. Gonzalez-Coma A1 - Nuria González-Prelcic A1 - Luis Castedo A1 - Robert W. Heath Jr. KW - compass KW - mmWave JF - Asilomar Conf. on Signals, Systems and Computers ER - TY - CONF T1 - Full-duplex operation in two-way broadcast service for maritime applications T2 - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Tomás Ramírez A1 - Carlos Mosquera KW - compass KW - full duplex KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop ER - TY - JOUR T1 - Hybrid MIMO Architectures for Millimeter Wave Communications: Phase Shifters or Switches? JF - IEEE Access Y1 - 2016 A1 - Mendez-Rial, Roi A1 - Rusu, Cristian A1 - Nuria González-Prelcic A1 - Alkhateeb, A. A1 - Heath Jr, Robert W. VL - 4 UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7370753 ER - TY - CONF T1 - Hybrid precoders and combiners for mmWave MIMO systems with per-antenna power constraints T2 - IEEE Global Telecommunications Conf. (GLOBECOM) Y1 - 2016 A1 - R. López-Valcarce A1 - Nuria González-Prelcic A1 - Cristian Rusu A1 - R. W. Heath, Jr KW - compass KW - mmWave AB -
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.
JF - IEEE Global Telecommunications Conf. (GLOBECOM) ER - TY - CONF T1 - Image denoising in the encrypted domain T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2016 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - compass KW - homomorphic processing KW - Image Denoising KW - Image Encryption KW - lattice cryptography JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Abu Dhabi, UAE ER - TY - CONF T1 - The impact of feeder link interference in multiple gateway multibeam satellite systems T2 - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Vahid Joroughi A1 - Carlos Mosquera KW - compass KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - Link adaptation in mobile satellite links: field trials results T2 - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Iago Gómez KW - compass KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop ER - TY - JOUR T1 - Link adaptation in mobile satellite links: schemes for different degrees of CSI knowledge JF - International Journal of Satellite Communications and Networking Y1 - 2016 A1 - Alberto Rico-Alvariño A1 - Jesus Arnau A1 - Carlos Mosquera KW - compass KW - satcom VL - 34 IS - 5 ER - TY - JOUR T1 - Low complexity hybrid precoding strategies for millimeter wave communication systems JF - IEEE Trans. Wireless Communications Y1 - 2016 A1 - Cristian Rusu A1 - Roi Méndez-Rial A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - compass KW - mmWave AB -

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.

VL - 15 IS - 12 ER - TY - JOUR T1 - Multiantenna GLR detection of rank-one signals with known power spectral shape under spatially uncorrelated noise JF - IEEE Transactions on Signal Processing Y1 - 2016 A1 - Josep Sala A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - Saeid Sedighi A1 - Abbas Taherpour KW - cognitive radio KW - compass AB -

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.

VL - 64 IS - 23 ER - TY - CONF T1 - Online EM-based distributed estimation in sensor networks with faulty nodes T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2016 A1 - Pere Gimenez-Febrer A1 - Alba Pagès-Zamora A1 - R. López-Valcarce KW - compass KW - wsn AB -
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.
JF - European Signal Processing Conference (EUSIPCO) CY - Budapest, Hungary ER - TY - JOUR T1 - An overview of signal processing techniques for millimeter wave MIMO systems JF - IEEE J. Selected Topics in Signal Processing. Special issue on Signal Processing for Millimeter Wave Wireless Communications Y1 - 2016 A1 - Robert W. Heath Jr. A1 - Nuria González-Prelcic A1 - Sundeep Rangan A1 - Wonil Roh A1 - Akbar M. Sayeed KW - compass KW - mmWave AB -

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.

VL - 10 IS - 3 ER - TY - JOUR T1 - Properties of real and complex ETFs and their application to the design of low coherence frames JF - Linear Algebra and its Applications Y1 - 2016 A1 - Cristian Rusu A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. VL - 508 UR - http://www.sciencedirect.com/science/article/pii/S0024379516302555 ER - TY - CONF T1 - Radar aided mmWave beam alignment in V2I communications supporting antenna diversity T2 - Information Theory and Applications Workshop (ITA Y1 - 2016 A1 - Nuria González-Prelcic A1 - R. Méndez-Rial A1 - R.W. Heath Jr. KW - compass KW - mmWave JF - Information Theory and Applications Workshop (ITA ER - TY - CONF T1 - Robust analog precoding designs for millimeter wave MIMO transceivers T2 - 20th International ITG Workshop on Smart Antennas (WSA) Y1 - 2016 A1 - Pengfei Xia A1 - Robert Heath A1 - Nuria González-Prelcic KW - compass KW - mmWave JF - 20th International ITG Workshop on Smart Antennas (WSA) ER - TY - JOUR T1 - Robust analog precoding designs for millimeter wave MIMO transceivers with frequency and time division duplexing JF - IEEE Trans. Communications Y1 - 2016 A1 - Pengfei Xia A1 - Robert W. Heath Jr. A1 - Nuria González-Prelcic KW - compass KW - mmWave AB -

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.

VL - 64 IS - 11 ER - TY - JOUR T1 - Security in automotive radar and vehicular networks JF - Microwave Journal Y1 - 2016 A1 - E. R. Yeh A1 - J. Choi A1 - Nuria González-Prelcic A1 - C. Bhat A1 - R. W. Heath Jr. KW - compass KW - mmWave ER - TY - RPRT T1 - Technical Report for ID TNET-2015-00294 “Optimal delay characteristic when the number of users is comparable to the number of rounds" Y1 - 2016 A1 - Simon Oya A1 - Fernando Pérez-González A1 - Carmela Troncoso ER - TY - RPRT T1 - Technical Report TSC/SO/24082016: Filter design for delay-based anonymous communications Y1 - 2016 A1 - Simon Oya A1 - Fernando Pérez-González A1 - Carmela Troncoso ER - TY - CONF T1 - The use of unit norm tight measurement matrices for one-bit compressed sensing T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2016 A1 - C. Rusu A1 - Nuria González-Prelcic A1 - R. W. Heath Jr. KW - compass KW - compressed sensing AB -

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

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) ER - TY - CONF T1 - Wideband self-interference cancellation for better spectrum use T2 - IEEE WoWMoM 2016 Workshop on Fifth Generation Wireless Y1 - 2016 A1 - Carlos Mosquera KW - adaptive signal processing KW - compass KW - full duplex JF - IEEE WoWMoM 2016 Workshop on Fifth Generation Wireless ER - TY - CONF T1 - Adaptive hybrid precoding and combining in mmWave multiuser MIMO systems based on compressed covariance estimation T2 - IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) Y1 - 2015 A1 - R. Méndez-Rial A1 - Nuria González-Prelcic A1 - R. W. Heath Jr. KW - compass KW - mmWave JF - IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) ER - TY - CONF T1 - Adaptive one-bit compressive sensing with application to low-precision receivers at mmWave T2 - IEEE Global Telecommunications Conf. (GLOBECOM), Y1 - 2015 A1 - C. Rusu A1 - R. Méndez-Rial A1 - Nuria González-Prelcic A1 - R. W. Heath, Jr KW - compass KW - mmWave JF - IEEE Global Telecommunications Conf. (GLOBECOM), ER - TY - JOUR T1 - On the analysis of scheduling in dynamic duplex multi-hop mmWave cellular systems JF - IEEE Transactions on Wireless Communications Y1 - 2015 A1 - García-Rois, Juan A1 - Gomez-Cuba, Felipe A1 - Akdeniz, Mustafa Riza A1 - González-Castaño, Francisco Javier A1 - Burguillo-Rial, Juan Carlos A1 - Rangan, Sundeep A1 - Lorenzo, Beatriz VL - 14 ER - TY - CONF T1 - Attack detectors for data aggregation in clustered sensor networks T2 - European Signal Processing Conf. (EUSIPCO) Y1 - 2015 A1 - R. López-Valcarce A1 - Daniel Romero KW - adversarial signal processing KW - compass KW - wsn AB -
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’s test for homoscedasticity constituting a good candidate when lacking a priori knowledge of the variance of the underlying distribution.
JF - European Signal Processing Conf. (EUSIPCO) PB - EURASIP CY - Nice, France ER - TY - CONF T1 - An attack on antenna subset modulation for millimeter-wave communication T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2015 A1 - Cristian Rusu A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - adversarial signal processing KW - compass KW - mmWave AB -

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.

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Brisbane, Australia ER - TY - CONF T1 - Augmented covariance estimation with a cyclic approach in DOA T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2015 A1 - Roi Méndez-Rial A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - DOA estimation KW - Non-uniformly spaced arrays AB -

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.

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Brisbane, Australia ER - TY - CONF T1 - Bandwidth occupancy of non-coherent wideband fading channels T2 - IEEE International Symposium on Information Theory (ISIT) Y1 - 2015 A1 - Gomez-Cuba, Felipe A1 - Du, Jinfeng A1 - Médard, Muriel A1 - Erkip, Elza JF - IEEE International Symposium on Information Theory (ISIT) ER - TY - CONF T1 - Blind Satellite Inter-Gateway Interference Mitigation T2 - IEEE International Conference on Communications (ICC) Y1 - 2015 A1 - J. Arnau A1 - C. Mosquera KW - compass KW - satcom JF - IEEE International Conference on Communications (ICC) ER - TY - CONF T1 - Capacity scaling in noncoherent wideband massive SIMO systems T2 - IEEE Information Theory Workshop (ITW) Y1 - 2015 A1 - Chowdhury, Mainak A1 - Manolakos, Alexandros A1 - Gomez-Cuba, Felipe A1 - Erkip, Elza A1 - Goldsmith, Andrea J JF - IEEE Information Theory Workshop (ITW) ER - TY - JOUR T1 - Compression Limits for Random Vectors with Linearly Parameterized Second-Order Statistics JF - IEEE Trans. Information Theory Y1 - 2015 A1 - Daniel Romero A1 - R. López-Valcarce A1 - Geert Leus KW - compass KW - compressed sensing AB -
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 — 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.
VL - 61 IS - 3 ER - TY - JOUR T1 - Cramér-Rao Bounds for SNR Estimation of Oversampled Linearly Modulated Signals JF - IEEE Trans. Signal Processing Y1 - 2015 A1 - R. López-Valcarce A1 - J. Villares A1 - J. Riba A1 - W. Gappmair A1 - C. Mosquera KW - adaptive signal processing KW - compass KW - Cramér-Rao bound (CRB) KW - dynacs KW - oversampling KW - Signal-to-noise ratio (SNR) AB -
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) Cramér-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.
VL - 63 IS - 7 ER - TY - CONF T1 - Dictionary-free Hybrid Precoders and Combiners for mmWave MIMO Systems T2 - IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2015 A1 - Roi Méndez-Rial A1 - Cristian Rusu A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - compass KW - mmWave JF - IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) PB - IEEE CY - Stockholm, Sweden ER - TY - CONF T1 - Distributed AoA-based Source Positioning in NLOS with Sensor Networks T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2015 A1 - Pere Gimenez-Febrer A1 - Alba Pagès-Zamora A1 - Silvana Silva Pereira A1 - R. López-Valcarce KW - compass KW - wsn AB -
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.
JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Brisbane, Australia ER - TY - CONF T1 - Distributed TLS Estimation under Random Data Faults T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2015 A1 - Silvana Silva Pereira A1 - Alba Pagès-Zamora A1 - R. López-Valcarce KW - compass KW - wsn AB -
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.
JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Brisbane, Australia ER - TY - THES T1 - Estimation, Detection, and Learning for Dynamic Spectrum Access Y1 - 2015 A1 - Daniel Romero KW - cognitive radio KW - compass KW - dynacs KW - wsn PB - University of Vigo CY - Vigo, Spain VL - Ph.D. ER - TY - JOUR T1 - Forensic detection of processing operator chains: recovering the history of filtered JPEG images JF - IEEE Transactions on Information Forensics and Security Y1 - 2015 A1 - Valentina Conotter A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - compass KW - forensics U1 -

Accepted for publication.

ER - TY - CONF T1 - Frequency Reuse in Dual Satellite Settings: an Initial Evaluation of Full Duplex Operation T2 - IEEE International Conference on Communications (ICC) Y1 - 2015 A1 - D. Martiñán-Otero A1 - C. Mosquera KW - compass KW - full duplex KW - satcom JF - IEEE International Conference on Communications (ICC) ER - TY - JOUR T1 - A Greedy Topology Design to Accelerate Consensus in Broadcast Wireless Sensor Networks JF - Information Processing Letters Y1 - 2015 A1 - Massimo Vecchio A1 - R. López-Valcarce KW - compass KW - wsn AB -

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.

VL - 115 IS - 3 ER - TY - JOUR T1 - Improving Area Coverage of Wireless Sensor Networks Via Controllable Mobile Nodes: a Greedy Approach JF - Journal of Network and Computer Applications Y1 - 2015 A1 - Massimo Vecchio A1 - R. López-Valcarce KW - compass KW - wsn AB -
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.
VL - 48 ER - TY - CONF T1 - Low Complexity Hybrid Sparse Precoding and Combining in Millimeter Wave MIMO Systems T2 - IEEE Int. Conference on Communications (ICC) Y1 - 2015 A1 - Cristian Rusu A1 - Roi Méndez-Rial A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - compass KW - mmWave JF - IEEE Int. Conference on Communications (ICC) PB - IEEE CY - London, UK ER - TY - CONF T1 - Low Resolution Adaptive Compressed Sensing for mmWave MIMO receivers T2 - Asilomar Conf. on Signals, Systems, and Computers Y1 - 2015 A1 - C. Rusu A1 - Nuria González-Prelcic A1 - R.W. Heath Jr. KW - compass KW - mmWave JF - Asilomar Conf. on Signals, Systems, and Computers ER - TY - CONF T1 - A Microeconomic Approach to Data Trading in User Provided Networks T2 - IEEE Globecom Workshops Y1 - 2015 A1 - Lorenzo, B A1 - Gomez-Cuba, F A1 - Garcia-Rois, J A1 - Gonzalez-Castano, F J A1 - Burguillo, J C JF - IEEE Globecom Workshops ER - TY - CHAP T1 - Multibeam Joint Detection T2 - Cooperative and Cognitive Satellite Systems Y1 - 2015 A1 - J. Arnau A1 - R. de Lamare A1 - C. Mosquera KW - satcom JF - Cooperative and Cognitive Satellite Systems PB - Elsevier ER - TY - CONF T1 - Multipath cancellation in broadband acoustic local positioning systems T2 - IEEE 9th International Symposium on Intelligent Signal Processing (WISP) Y1 - 2015 A1 - Fernando J. Alvarez A1 - R. López-Valcarce KW - compass KW - wsn AB -

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.

JF - IEEE 9th International Symposium on Intelligent Signal Processing (WISP) PB - IEEE CY - Siena, Italy ER - TY - CONF T1 - Multivariate Lattices for Encrypted Image Processing T2 - IEEE International Conference on Acoustics, Speech and Signal Processing Y1 - 2015 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - homomorphic encryption KW - lattice cryptography KW - SPED JF - IEEE International Conference on Acoustics, Speech and Signal Processing PB - IEEE CY - Brisbane, Australia ER - TY - CONF T1 - Pushing for higher rates and efficiency in Satcom: the different perspectives within SatNExIV T2 - Twelfth International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2015 A1 - Miguel Ángel Vázquez A1 - Ana Pérez Neira A1 - Carlos Mosquera A1 - Bhavani Shankar A1 - Pol Henarejos A1 - Athanasios Panagopoulos A1 - Giovanni Giambene A1 - Vasilios Siris A1 - George Polyzos A1 - Nader Alagha KW - satcom JF - Twelfth International Symposium on Wireless Communication Systems (ISWCS) CY - Brussels ER - TY - CONF T1 - Robust Adaptive Coding and Modulation Scheme for the Mobile Satellite Forward Link T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC Y1 - 2015 A1 - Alberto Rico-Alvariño A1 - Anxo Tato A1 - Carlos Mosquera KW - compass KW - satcom JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC ER - TY - CONF T1 - Spectrum Cartography using quantized observations T2 - IEEE Int. Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2015 A1 - Daniel Romero A1 - Seung-Jun Kim A1 - R. López-Valcarce A1 - Georgios Giannakis KW - cognitive radio KW - compass KW - compressed sensing KW - spectrum sensing AB -
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.
JF - IEEE Int. Conference on Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Brisbane, Australia ER - TY - CONF T1 - Subspace-constrained SINR optimization in MIMO full-duplex relays under limited dynamic range T2 - IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2015 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce A1 - Taneli Riihonen A1 - Stefan Werner A1 - Risto Wichman KW - adaptive signal processing KW - compass KW - full duplex AB -
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.
JF - IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) PB - IEEE CY - Stockholm, Sweden ER - TY - CONF T1 - An SVD Approach to Forensic Image Resampling Detection T2 - EUSIPCO Y1 - 2015 A1 - David Vázquez-Padín A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - compass KW - digital image forensics KW - resampling detection KW - SVD KW - tampering detection AB -
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.
JF - EUSIPCO ER - TY - JOUR T1 - Active Interference Cancellation for OFDM Spectrum Sculpting: Linear Processing is Optimal JF - IEEE Communications Letters Y1 - 2014 A1 - Schmidt, J.F. A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - compass KW - dynacs KW - spectrum shaping AB -

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.

 

VL - 18 IS - 9 ER - TY - CONF T1 - Antenna competition to boost Active Interference Cancellation in cognitive MIMO-OFDM T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) Y1 - 2014 A1 - Schmidt, J.F. A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum shaping AB - 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. JF - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) CY - A Coruña, Spain ER - TY - CONF T1 - Are you threatening me? Towards smart detectors in watermarking T2 - Media Watermarking, Security, and Forensics Y1 - 2014 A1 - Mauro Barni A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Benedetta Tondi KW - adversarial signal processing KW - watermarking JF - Media Watermarking, Security, and Forensics PB - SPIE CY - San Francisco, CA, USA ER - TY - CONF T1 - Balancing Closed and Open Loop CSI in Mobile Satellite Link Adaptation T2 - Proc. ASMS & SPSC Y1 - 2014 A1 - Alberto Rico-Alvariño A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - satcom JF - Proc. ASMS & SPSC CY - Livorno, Italy U1 -

Best paper award

ER - TY - CONF T1 - A Benford-Fourier JPEG compression detector T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2014 A1 - Cecilia Pasquini A1 - Fernando Pérez-González A1 - Giulia Boato KW - compass KW - forensics JF - IEEE International Conference on Image Processing (ICIP) CY - Paris, France ER - TY - CONF T1 - Bootstrap-based Proxy Reencryption for Private Multi-user Computing T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2014 A1 - Juan Ramón Troncoso-Pastoriza A1 - Serena Caputo KW - SPED JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Atlanta, GA ER - TY - CONF T1 - Channel estimation in millimeter wave MIMO systems with one-bit quantization T2 - Asilomar Conf. on Signals, Systems and Computers Y1 - 2014 A1 - Jianhua Mo A1 - Phil Schniter A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - adaptive signal processing KW - compass KW - mmWave JF - Asilomar Conf. on Signals, Systems and Computers ER - TY - CONF T1 - Circular Sparse Rulers Based On Co-prime Sampling For Compressive Power Spectrum Estimation T2 - IEEE Global Communications Conference Y1 - 2014 A1 - Nuria González-Prelcic A1 - M. E. Domíngez-Jiménez KW - cognitive radio KW - compass KW - compressed sensing JF - IEEE Global Communications Conference PB - IEEE CY - Austin, TX ER - TY - THES T1 - Cognitive and Signal Processing Techniques for Improved Spectrum Exploitation in Wireless Communications Y1 - 2014 A1 - Alberto Rico-Alvariño KW - cognitive radio KW - satcom PB - Universidade de Vigo CY - Vigo ER - TY - CONF T1 - Cooperative compressive power spectrum estimation T2 - IEEE Sensor Array Multichannel Signal Process. Workshop (SAM) Y1 - 2014 A1 - Dyonisius D Ariananda A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - wsn JF - IEEE Sensor Array Multichannel Signal Process. Workshop (SAM) ER - TY - CONF T1 - Detecting Misreporting Attacks to the Proportional Fair Scheduler T2 - IEEE Workshop on Information Forensics and Security (WIFS) Y1 - 2014 A1 - Schmidt, J.F. A1 - R. López-Valcarce KW - adversarial signal processing KW - compass AB -
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.
JF - IEEE Workshop on Information Forensics and Security (WIFS) CY - Atlanta, USA ER - TY - CONF T1 - Dissection of multibeam satellite communications with a large-scale antenna system toolbox T2 - European Wireless 2014 (EW2014) Y1 - 2014 A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - large-scale analysis KW - Massive MIMO KW - multibeam satellites KW - Multiuser detection KW - satcom AB -

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.

JF - European Wireless 2014 (EW2014) CY - Barcelona, Spain ER - TY - CONF T1 - Distributed Total Least Squares Estimation over Networks T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2014 A1 - R. López-Valcarce A1 - Silvana Silva Pereira A1 - Alba Pagès-Zamora KW - dynacs KW - wsn AB -

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.

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) CY - Florence, Italy ER - TY - CONF T1 - Do dummies pay off? Limits of dummy traffic protection in anonymous communications T2 - Privacy Enhancing Technologies Symposium Y1 - 2014 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González KW - anonymous communications KW - compass KW - disclosure attacks KW - dummies JF - Privacy Enhancing Technologies Symposium ER - TY - CONF T1 - FER prediction with variable codeword length T2 - ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) Y1 - 2014 A1 - Alberto Rico-Alvariño A1 - Robert W. Heath Jr. A1 - Carlos Mosquera KW - adaptive signal processing KW - compass KW - dynacs KW - Effective SNR KW - FER prediction KW - PHY abstraction AB -

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.

JF - ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) CY - Florence, Italy ER - TY - CONF T1 - Flat Fading Channel Estimation Based on Dirty Paper Coding T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2014 A1 - Gabriel Domínguez-Conde A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - channel estimation KW - dirty paper coding KW - dynacs KW - superimposed pilots AB -

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. 

JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) CY - Florence, Italy ER - TY - CONF T1 - How to Implement Doubly-Stochastic Matrices for Consensus-Based Distributed Algorithms T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) Y1 - 2014 A1 - S. Valcárcel-Macua A1 - C. Moreno-León A1 - J. S. Romero A1 - Silvana Silva Pereira A1 - Javier Zazo A1 - Alba Pagès-Zamora A1 - R. López-Valcarce A1 - S. Zazo KW - compass KW - dynacs KW - wsn AB -
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.
JF - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) CY - A Coruña, Spain ER - TY - JOUR T1 - Learning-Based Adaptive Transmission for Limited Feedback Multiuser MIMO-OFDM JF - IEEE Transactions on Wireless Communications Y1 - 2014 A1 - Alberto Rico-Alvariño A1 - Robert W. Heath Jr. KW - adaptive signal processing KW - dynacs ER - TY - JOUR T1 - A Least Squares Approach to the Static Traffic Analysis of High-Latency Anonymous Communication Systems JF - IEEE Transactions on Information Forensics and Security Y1 - 2014 A1 - Fernando Pérez-González A1 - Carmela Troncoso A1 - Simon Oya ER - TY - CONF T1 - Low-Power Active Interference Cancellation for OFDM Spectrum Sculpting T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2014 A1 - Schmidt, J.F. A1 - Daniel Romero A1 - R. López-Valcarce AB -
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.
JF - European Signal Processing Conference (EUSIPCO) UR - http://www.eurasip.org/Proceedings/Eusipco/Eusipco2014/HTML/papers/1569912103.pdf ER - TY - JOUR T1 - MIMO precoding and combining solutions for millimeter wave systems JF - IEEE Communications Magazine Y1 - 2014 A1 - Ahmed Alkhateeb A1 - Jianhua Mo A1 - Nuria González-Prelcic A1 - Robert W. Heath Jr. KW - adaptive signal processing KW - compass KW - mmWave AB -

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.

VL - 52 IS - 12 ER - TY - CONF T1 - Multiple JPEG compression detection by means of Benford-Fourier coefficients T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2014 A1 - Cecilia Pasquini A1 - Giulia Boato A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Atlanta, GA ER - TY - CONF T1 - Nearly-Optimal Compression Matrices for Signal Power Estimation T2 - IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2014 A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - dynacs JF - IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Toronto, Canada ER - TY - CONF T1 - A New Look At ML Step-Size Estimation for Scalar Costa Scheme Data Hiding T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2014 A1 - Gabriel Domínguez-Conde A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - IEEE International Conference on Image Processing (ICIP) CY - Paris, France ER - TY - THES T1 - Neyman-Pearson Decision in Traffic Analysis Y1 - 2014 A1 - Juan A. Elices PB - University of New Mexico CY - Albquerque, NM, USA ER - TY - CONF T1 - OFDM spectrum sculpting with active interference cancellation: Keeping spectral spurs at bay T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2014 A1 - Schmidt, J.F. A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum shaping JF - IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Florence, Italy ER - TY - THES T1 - On-Ground Processing for Spectral Efficiency Improvement in Next Generation Satellite Communications Y1 - 2014 A1 - Arnau, Jesus KW - satcom AB -
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'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.
PB - Universidade de Vigo CY - Vigo, Spain ER - TY - CONF T1 - The optimal attack to histogram-based forensic detectors is simple(x) T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2014 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - compass KW - Multimedia security JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Atlanta, GA U1 -

IEEE WIFS 2015 Best Paper Award

ER - TY - JOUR T1 - Performance of the Multibeam Satellite Return Link with Correlated Rain Attenuation JF - IEEE Transactions on Wireless Communications Y1 - 2014 A1 - Arnau, Jesus A1 - Christopoulos, D. A1 - Chatzinotas, S. A1 - C. Mosquera A1 - Ottersten, B. KW - Antennas KW - Approximation methods KW - Attenuation KW - Correlation KW - dynacs KW - Rain KW - satcom KW - Satellites KW - Signal to noise ratio AB -

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 – like the inter-user distance, the satellite beam radius, or the rain intensity– 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.

ER - TY - CONF T1 - Power spectrum blind sampling using optimal multicoset sampling patterns in the MSE sense T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2014 A1 - Bamrung TauSiesakul A1 - Nuria González-Prelcic KW - cognitive radio KW - dynacs JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - CONF T1 - Practical Smart Grid Traffic Management in Leased Internet Access Networks T2 - IEEE International Energy Conference (ENERGYCON) Y1 - 2014 A1 - Gomez-Cuba, Felipe A1 - González-Castaño, Francisco Javier A1 - Pérez-Garrido, Carlos P. AB -

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

JF - IEEE International Energy Conference (ENERGYCON) ER - TY - CONF T1 - Scaling laws for infrastructure single and multihop wireless networks in wideband regimes T2 - IEEE International Symposium on Information Theory (ISIT) Y1 - 2014 A1 - Gomez-Cuba, Felipe A1 - Rangan, Sundeep A1 - Erkip, Elza AB -

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.

JF - IEEE International Symposium on Information Theory (ISIT) CY - Honolulu ER - TY - CONF T1 - Sensitivity of compressive sensing architectures based on time interleaved analog-to-digital converters to channel mismatches T2 - IEEE International New Circuits and Systems Conference (NEWCAS) Y1 - 2014 A1 - Roi Méndez-Rial A1 - J.M. Caurel-Carrera A1 - Nuria González-Prelcic KW - dynacs JF - IEEE International New Circuits and Systems Conference (NEWCAS) ER - TY - CONF T1 - SINR Optimization in Wideband Full-Duplex MIMO Relays under Limited Dynamic Range T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) Y1 - 2014 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce A1 - Taneli Riihonen A1 - Stefan Werner A1 - Risto Wichman KW - adaptive signal processing KW - compass KW - full duplex JF - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) CY - A Coruña, Spain ER - TY - JOUR T1 - Spectrum Sensing for Wireless Microphone Signals using Multiple Antennas JF - IEEE Trans. on Vehicular Technology Y1 - 2014 A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - dynacs AB - 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. VL - 63 IS - 9 ER - TY - RPRT T1 - Technical Report TSC/FPG/20032014: Performance Analysis of the Least Squares Disclosure Attack with Time-Varying User Behavior Y1 - 2014 A1 - Fernando Pérez-González A1 - Carmela Troncoso A1 - Simon Oya ER - TY - RPRT T1 - Technical Report TSC/SO/02052014: Derivation of the Mean Squared Error of the Least Squares Estimator in a Timed Pool Mix with Dummy Traffic Y1 - 2014 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González ER - TY - RPRT T1 - Technical Report UV/TSC/APU/02102014: Multivariate Ring Learning with Errors Y1 - 2014 A1 - Alberto Pedrouzo-Ulloa A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González PB - University of Vigo ER - TY - CONF T1 - Transportation-theoretic image counterforensics to first significant digit histogram forensics T2 - IEEE International Conference on Audio, Speech, and Signal Processing (ICASSP) Y1 - 2014 A1 - Cecilia Pasquini A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - IEEE International Conference on Audio, Speech, and Signal Processing (ICASSP) PB - IEEE CY - Florence, Italy ER - TY - CONF T1 - Understanding the Effects of Real-World Behavior in Statistical Disclosure Attacks T2 - IEEE Workshop on Information Forensics and Security Y1 - 2014 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González JF - IEEE Workshop on Information Forensics and Security ER - TY - CONF T1 - Adaptive Self-interference Cancellation in Wideband Full-Duplex Decode-and-Forward MIMO Relays T2 - IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2013 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce A1 - Taneli Riihonen A1 - Stefan Werner A1 - Risto Wichman KW - adaptive signal processing KW - dynacs KW - full duplex JF - IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Darmstadt, Germany ER - TY - CONF T1 - Analytical Characterization of the Single Frequency Network Gain Using Effective SNR Metrics T2 - The Tenth International Symposium on Wireless Communication Systems 2013 (ISWCS 2013) Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - broadcasting KW - dynacs KW - Effective SNR metrics KW - Single Frequency Network AB -

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.

JF - The Tenth International Symposium on Wireless Communication Systems 2013 (ISWCS 2013) CY - Ilmenau, Germany ER - TY - CONF T1 - Autocorrelation-based adaptation rule for feedback equalization in Wideband Full-Duplex Amplify-and-Forward MIMO relays T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) Y1 - 2013 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce A1 - Taneli Riihonen A1 - Stefan Werner A1 - Risto Wichman KW - adaptive signal processing KW - dynacs KW - full duplex AB -
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.
JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) ER - TY - CONF T1 - Cancelling self-interference in full-duplex relays without Angle-of-Arrival information T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) Y1 - 2013 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce KW - adaptive signal processing KW - dynacs KW - full duplex AB -
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.
JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) ER - TY - JOUR T1 - Choose Your Subcarriers Wisely: Active Interference Cancellation for Cognitive OFDM JF - IEEE Journal on Emerging and Selected Topics in Circuits and Systems Y1 - 2013 A1 - Schmidt, J.F. A1 - Costas-Sanz, S. A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum shaping VL - 3 IS - 4 ER - TY - CONF T1 - A Class of Circular Sparse Rulers for Compressive Power Spectrum Estimation T2 - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco) Y1 - 2013 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic KW - cognitive radio KW - dynacs JF - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco) ER - TY - JOUR T1 - A Cognitive Mobile BTS Solution with Software-Defined Radioelectric Sensing JF - Sensors Y1 - 2013 A1 - J. Muñoz A1 - J. Vales-Alonso A1 - F. Quiñoy-García A1 - Costas-Sanz, S. A1 - M. Pillado A1 - F.J. González-Castaño A1 - M. García-Sanchez A1 - R. López-Valcarce A1 - C. López-Bravo KW - cognitive radio KW - dynacs KW - mobile communications KW - SDR KW - vehicular communications AB -

 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.

VL - 13 IS - 2 ER - TY - CONF T1 - Compressive Angular and Frequency Periodogram Reconstruction for Multiband Signals T2 - IEEE Int. Workshop Comput. Advances Multi-Sensor Adaptive Process (CAMSAP) Y1 - 2013 A1 - Ariananda, D. D. A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - dynacs JF - IEEE Int. Workshop Comput. Advances Multi-Sensor Adaptive Process (CAMSAP) CY - San Martin ER - TY - CONF T1 - Compressive Covariance Sampling T2 - Inform. Theory Appl. Workshop Y1 - 2013 A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - dynacs JF - Inform. Theory Appl. Workshop ER - TY - CONF T1 - Compressive wideband spectrum sensing with spectral prior information T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) Y1 - 2013 A1 - Daniel Romero A1 - R. López-Valcarce A1 - Geert Leus KW - cognitive radio KW - dynacs KW - spectrum sensing AB -
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.
JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) ER - TY - CONF T1 - Coping with the enemy: Advances in adversary-aware signal processing T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2013 A1 - Mauro Barni A1 - Fernando Pérez-González JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Vancouver, Canada UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6639361 ER - TY - Generic T1 - Cross Layer Link Adaptation in Time Varying Mobile Satellite Channels with Statistical and Outdated CSIT T2 - Asilomar Conference on Signals Systems and Computers Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - J. Arnau A1 - Carlos Mosquera KW - dynacs KW - satcom JF - Asilomar Conference on Signals Systems and Computers ER - TY - JOUR T1 - On the design of a novel two-objective harmony search approach for distance- and connectivity-based localization in wireless sensor networks JF - Engineering Applications of Artificial Intelligence Y1 - 2013 A1 - Diana Manjarres A1 - Javier Del Ser A1 - Sergio Gil-Lopez A1 - Massimo Vecchio A1 - Itziar Landa-Torres A1 - Sancho Salcedo-Sanz A1 - R. López-Valcarce KW - dynacs KW - wsn VL - 26 IS - 2 ER - TY - CONF T1 - A Diffusion-based distributed EM algorithm for density estimation in wireless sensor networks T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) Y1 - 2013 A1 - Silvana Silva Pereira A1 - Alba Pagès-Zamora A1 - R. López-Valcarce KW - dynacs KW - wsn AB -
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.
JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) ER - TY - JOUR T1 - A Diffusion-Based EM Algorithm for Distributed Estimation in Unreliable Sensor Networks JF - IEEE Signal Processing Letters Y1 - 2013 A1 - Silvana Silva Pereira A1 - R. López-Valcarce A1 - Alba Pagès-Zamora KW - dynacs KW - wsn AB -

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–Rao Lower Bound at all SNR values and compares favorably with other approaches.

VL - 20 IS - 6 ER - TY - CONF T1 - The flow fingerprinting game T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2013 A1 - Juan A. Elices A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Guangzhou, China ER - TY - CONF T1 - Forensic analysis of full-frame linearly filtered JPEG images T2 - IEEE International Conference on Image Processing Y1 - 2013 A1 - Valentina Conotter A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - JPEG compression KW - linear filtering JF - IEEE International Conference on Image Processing CY - Melbourne, Australia ER - TY - JOUR T1 - Fully Private Noninteractive Face Verification JF - IEEE Transactions on Information Forensics and Security Y1 - 2013 A1 - Juan Ramón Troncoso-Pastoriza A1 - Daniel González-Jiménez A1 - Fernando Pérez-González KW - SPED VL - 8 IS - 7 U1 -

To appear

ER - TY - CONF T1 - Joint detection of full-frame linear filtering and JPEG compression in digital images T2 - IEEE International Workshop on Information Forensics and Security Y1 - 2013 A1 - Valentina Conotter A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security PB - IEEE CY - Guangzhou, China ER - TY - JOUR T1 - Lattice implementation of adaptive channel shortening in multicarrier transmission over IIR channels JF - EURASIP Journal on Advances in Signal Processing Y1 - 2013 A1 - E. Ben Salem A1 - S. Cherif A1 - H. Besbes A1 - R. López-Valcarce VL - 2013:174 UR - http://asp.eurasipjournals.com/content/2013/1/174 ER - TY - CONF T1 - Learning Based Link Adaptation in Multiuser MIMO-OFDM T2 - 21st European Signal Processing Conference 2013 (EUSIPCO 2013) Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - Robert W. Heath Jr. KW - dynacs KW - link adaptation KW - Machine Learning KW - Multiuser MIMO-OFDM AB -

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.

JF - 21st European Signal Processing Conference 2013 (EUSIPCO 2013) CY - Marrakech, Morocco ER - TY - RPRT T1 - Least Squares Disclosure Attacks: User Profiling for Mix-based Anonymous Communication Systems Y1 - 2013 A1 - Fernando Pérez-González A1 - Carmela Troncoso PB - University of Vigo CY - Vigo ER - TY - CONF T1 - Link Adaptation in MIMO-OFDM with Practical Impairments T2 - Asilomar Conference on Signals Systems and Computers Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - Robert W. Heath Jr. KW - dynacs KW - link adaptation KW - MIMO-OFDM JF - Asilomar Conference on Signals Systems and Computers ER - TY - CONF T1 - Localization of Forgeries in MPEG-2 Video through GOP Size and DQ analysis T2 - IEEE International Workshop on Multimedia Signal Processing (MMSP) Y1 - 2013 A1 - Daniele Labartino A1 - Tiziano Bianchi A1 - Alessia De Rosa A1 - Marco Fontani A1 - David Vázquez-Padín A1 - Alessandro Piva A1 - Mauro Barni AB -

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.

 
JF - IEEE International Workshop on Multimedia Signal Processing (MMSP) CY - Pula (Sardinia), Italy U1 -

Top 10% Award

ER - TY - Generic T1 - Locating Tor hidden services through an interval-based traffic-correlation attack T2 - 2013 IEEE Conference on Communications and Network Security (CNS) Y1 - 2013 A1 - Juan A. Elices A1 - Fernando Pérez-González JF - 2013 IEEE Conference on Communications and Network Security (CNS) CY - Washington, DC ER - TY - CONF T1 - Low Complexity Primary User Protection for Cognitive OFDM T2 - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco) Y1 - 2013 A1 - Schmidt, J.F. A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum shaping JF - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco) ER - TY - CONF T1 - Meet the Family of Statistical Disclosure Attacks T2 - GlobalSIP Y1 - 2013 A1 - Simon Oya A1 - Carmela Troncoso A1 - Fernando Pérez-González JF - GlobalSIP U1 -

Submitted

ER - TY - JOUR T1 - MMSE Performance Analysis of Generalized Multibeam Satellite Channels JF - Communications Letters, IEEE Y1 - 2013 A1 - Christopoulos, D. A1 - J. Arnau A1 - Chatzinotas, S. A1 - C. Mosquera A1 - Ottersten, B. KW - dynacs KW - linear minimum mean square error receivers KW - multibeam satellites KW - Multiuser detection KW - return link KW - satcom ER - TY - Generic T1 - Near optimal detection of quantized signals and application to JPEG forensics T2 - 2013 IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2013 A1 - Tiziano Bianchi A1 - Alessandro Piva A1 - Fernando Pérez-González JF - 2013 IEEE International Workshop on Information Forensics and Security (WIFS) CY - Guangzhou, China UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6707813 ER - TY - JOUR T1 - A novel heuristic approach for distance- and connectivity-based multihop node localization in wireless sensor networks JF - Soft Computing Y1 - 2013 A1 - Diana Manjarres A1 - Javier Del Ser A1 - Sergio Gil-Lopez A1 - Massimo Vecchio A1 - Itziar Landa-Torres A1 - R. López-Valcarce KW - dynacs KW - wsn VL - 17 IS - 1 ER - TY - CONF T1 - Open Loop Adaptive Coding and Modulation for Mobile Satellite Return Links T2 - 31st AIAA International Communications Satellite Systems Conference Y1 - 2013 A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - link adaptation KW - satcom JF - 31st AIAA International Communications Satellite Systems Conference PB - American Institute of Aeronautics and Astronautics CY - Florence, Italy U1 -

http://dx.doi.org/10.2514/6.2013-5704

ER - TY - CONF T1 - Optimal counterforensics for histogram-based forensics T2 - IEEE International Conference on Audio, Speech and Signal Processing Y1 - 2013 A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - IEEE International Conference on Audio, Speech and Signal Processing PB - IEEE CY - Vancouver, Canada ER - TY - CONF T1 - Power Spectrum Blind Sampling Using Minimum Mean Square Error and Weighted Least Squares T2 - Asilomar Conference on Signals, Systems and Computers Y1 - 2013 A1 - Bamrung TauSiesakul A1 - Nuria González-Prelcic KW - cognitive radio KW - dynacs JF - Asilomar Conference on Signals, Systems and Computers ER - TY - JOUR T1 - Privacy-Preserving Data Aggregation in Smart Metering Systems: An Overview JF - IEEE Signal Processing Magazine Y1 - 2013 A1 - Zekeriya Erkin A1 - Juan Ramón Troncoso-Pastoriza A1 - Reginald Lagendijk A1 - Fernando Pérez-González KW - SPED VL - 30 IS - 2 ER - TY - CONF T1 - Quantization lattice estimation for multimedia forensics T2 - IEEE International Conference on Image Processing Y1 - 2013 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Noelia Liste KW - Dual lattice KW - lattice estimation KW - multimedia forensics KW - noisy estimation JF - IEEE International Conference on Image Processing CY - Melbourne, Australia ER - TY - JOUR T1 - Secure Signal Processing in the Cloud: enabling technologies for privacy-preserving multimedia cloud processing JF - IEEE Signal Processing Magazine Y1 - 2013 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - SPED VL - 30 IS - 2 ER - TY - CONF T1 - Set-Membership Identification of Resampled Signals T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2013 A1 - David Vázquez-Padín A1 - Pedro Comesaña A1 - Fernando Pérez-González AB -

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.

 
JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Guangzhou, China ER - TY - JOUR T1 - Smart Grid Last-Mile Communications Model and Its Application to the Study of Leased Broadband Wired-Access JF - IEEE Transactions on Smart Grid Y1 - 2013 A1 - Gomez-Cuba, Felipe A1 - Asorey-Cacheda, Rafael A1 - González-Castaño, Francisco Javier AB -

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' 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.

VL - 4 ER - TY - CONF T1 - Spectrum Sensing in Time-Varying Channels Using Multiple Antennas T2 - IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt (Germany) Y1 - 2013 A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum sensing JF - IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt (Germany) ER - TY - CONF T1 - Statistical Cross Layer Adaptation in Fast Fading Mobile Satellite Channels T2 - Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - J. Arnau A1 - C. Mosquera KW - dynacs KW - fast fading channels KW - link adaptation KW - mobile satellite KW - satcom AB -

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.

JF - Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) CY - Atlanta, USA ER - TY - CONF T1 - Taking advantage of source correlation in forensic analysis T2 - IEEE International Workshop on Multimedia Signal Processing Y1 - 2013 A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - IEEE International Workshop on Multimedia Signal Processing CY - Pula (Sardinia), Italy ER - TY - JOUR T1 - Wideband Spectrum Sensing From Compressed Measurements Using Spectral Prior Information JF - IEEE Trans. Signal Process. Y1 - 2013 A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - compressed sensing KW - dynacs KW - spectrum sensing VL - 61 ER - TY - JOUR T1 - An Adaptive Feedback Canceller for Full-Duplex Relays Based on Spectrum Shaping JF - IEEE J. Selected Areas in Communications Y1 - 2012 A1 - R. López-Valcarce A1 - Emilio Antonio-Rodríguez A1 - C. Mosquera A1 - Fernando Pérez-González KW - adaptive signal processing KW - dynacs KW - full duplex AB -
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.
VL - 30 IS - 8 ER - TY - CONF T1 - Adaptive self-interference suppression for full-duplex relays with multiple receive antennas T2 - IEEE 13th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) Y1 - 2012 A1 - Emilio Antonio-Rodríguez A1 - R. López-Valcarce KW - adaptive signal processing KW - dynacs KW - full duplex AB -
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.
JF - IEEE 13th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) PB - IEEE CY - Çesme, Turkey ER - TY - CONF T1 - Adaptive Transmission Techniques for Mobile Satellite Links T2 - 30th AIAA International Communications Satellite Systems Conference (ICSSC) Y1 - 2012 A1 - Arnau, Jesus A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - dynacs KW - satcom JF - 30th AIAA International Communications Satellite Systems Conference (ICSSC) CY - Ottawa, Canada U1 -
Best Proffesional Paper Award
ER - TY - CONF T1 - Analysis and Design of Multirate Synchronous Sampling Schemes for Sparse Multiband Signals T2 - European Signal Processing Conference (EUSIPCO 2012) Y1 - 2012 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic KW - compressive sampling KW - Kruskal rank KW - multiband sparse signal KW - Multicoset sampling KW - multirate sampling KW - universal pattern AB -

 

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
JF - European Signal Processing Conference (EUSIPCO 2012) ER - TY - CONF T1 - Design of universal multicoset sampling patterns for compressed sensing of multiband sparse signals T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2012 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce AB -

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.

JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Kyoto (Japan) SN - 978-1-4673-0044-5 ER - TY - CONF T1 - Detection and information theoretic measures for quantifying the distinguishability between multimedia operator chains T2 - IEEE Workshop on Information Forensics and Security Y1 - 2012 A1 - Pedro Comesaña JF - IEEE Workshop on Information Forensics and Security PB - IEEE CY - Tenerife, Spain ER - TY - CONF T1 - Detection of Gaussian signals in unknown time-varying channels T2 - IEEE Statistical Signal Processing Workshop (SSP 2012) Y1 - 2012 A1 - Daniel Romero A1 - Javier Vía A1 - R. López-Valcarce A1 - Ignacio Santamaría KW - cognitive radio KW - dynacs KW - spectrum sensing AB -
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’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.
JF - IEEE Statistical Signal Processing Workshop (SSP 2012) PB - IEEE CY - Ann Arbor, MI ER - TY - CONF T1 - Detection of unknown constant magnitude signals in time-varying channels T2 - 3rd Int. Workshop on Cognitive Information Processing (CIP 2012) Y1 - 2012 A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum sensing AB -

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.

JF - 3rd Int. Workshop on Cognitive Information Processing (CIP 2012) CY - Baiona, Spain ER - TY - CONF T1 - Detection of video double encoding with GOP size estimation T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2012 A1 - David Vázquez-Padín A1 - Marco Fontani A1 - Tiziano Bianchi A1 - Pedro Comesaña A1 - Alessandro Piva A1 - Mauro Barni AB -

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.

JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Tenerife, Spain ER - TY - CONF T1 - On the Effect of Echoes in Hybrid Terrestrial-Satellite Single Frequency Networks: Analysis and Countermeasures T2 - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - dynacs KW - Effective SNR KW - Hybrid Terrestrial- Satellite KW - satcom KW - Satellite OFDM KW - Single Frequency Network KW - Space-Time Coding AB -

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.

JF - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) CY - Baiona, Spain ER - TY - THES T1 - Encrypted Domain Processing for Signal Processing Applications Y1 - 2012 A1 - Juan Ramón Troncoso-Pastoriza PB - University of Vigo CY - Vigo ER - TY - CONF T1 - Fingerprinting a flow of messages to an anonymous server. T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2012 A1 - Juan A. Elices A1 - Fernando Pérez-González JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Tenerife, Spain ER - TY - CONF T1 - Fully Homomorphic Faces T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2012 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - face verification KW - homomorphic processing KW - lattice cryptography KW - privacy KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Lake Buena Vista, Florida, USA ER - TY - CONF T1 - Generalized matched filter detector for fast fading channels T2 - IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2012) Y1 - 2012 A1 - Daniel Romero A1 - R. López-Valcarce A1 - Geert Leus KW - cognitive radio KW - dynacs KW - spectrum sensing AB -
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.
JF - IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2012) PB - IEEE CY - Kyoto, Japan ER - TY - CONF T1 - IPTV streaming source classification T2 - IEEE Workshop on Information Forensics and Security Y1 - 2012 A1 - Miguel Masciopinto A1 - Pedro Comesaña JF - IEEE Workshop on Information Forensics and Security CY - Tenerife, Spain ER - TY - CONF T1 - A Least Squares approach to user profiling in pool mix-based anonymous communication systems. T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2012 A1 - Fernando Pérez-González A1 - Carmela Troncoso JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - Tenerife, Spain ER - TY - CONF T1 - ML Estimation of the Resampling Factor T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2012 A1 - David Vázquez-Padín A1 - Pedro Comesaña AB -

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.

JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Tenerife, Spain ER - TY - JOUR T1 - Multiantenna GLR detection of rank-one signals with known power spectrum in white noise with unknown spatial correlation JF - IEEE Trans. on Signal Processing Y1 - 2012 A1 - Josep Sala A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce KW - cognitive radio KW - dynacs AB -
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.
VL - 60 IS - 6 ER - TY - CONF T1 - Multimedia operator chain topology and ordering estimation based on detection and information theoretic tools T2 - International Workshop on Digital-forensics and Watermarking Y1 - 2012 A1 - Pedro Comesaña A1 - Fernando Pérez-González JF - International Workshop on Digital-forensics and Watermarking CY - Shanghai, China ER - TY - CONF T1 - Multiuser Detection Performance in Multibeam Satellite Links under Imperfect CSI T2 - ASILOMAR 2012 Y1 - 2012 A1 - Arnau, Jesus A1 - C. Mosquera KW - dynacs KW - satcom JF - ASILOMAR 2012 CY - Pacific Grove, CA U1 -
Accepted for publication
ER - TY - CONF T1 - Optimum Training for CSI Acquisition in Cognitive Radio Channels T2 - Asilomar Conference on Signals, Systems, and Computers Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - adaptive signal processing KW - cognitive radio KW - dynacs JF - Asilomar Conference on Signals, Systems, and Computers CY - Pacific Grove, CA ER - TY - JOUR T1 - Overlay Cognitive Transmission in a Multicarrier Broadcast Network with Dominant Line of Sight Reception JF - IEEE Transactions on Wireless Communications Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs KW - satcom ER - TY - CONF T1 - Overlay cognitive transmission in OFDM point to point systems exploiting primary feedback T2 - 3rd International Workshop on Cognitive Information Processing (CIP) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - cognitive radio KW - dynacs AB -

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.

JF - 3rd International Workshop on Cognitive Information Processing (CIP) CY - Baiona, Galicia, Spain ER - TY - Generic T1 - Overlay Spectrum Reuse in a Broadcast Network: Covering the Whole Grayscale of Spaces T2 - IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - cognitive radio KW - dynacs JF - IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012) CY - Bellevue, WA ER - TY - CONF T1 - Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Coverage Analysis T2 - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs AB -

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.

JF - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) CY - Cesme, Turkey ER - TY - CONF T1 - Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Single Receiver Analysis T2 - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs AB -

The overlay cognitive radio paradigm presents a framework where a secondary user exploits the knowledge of the primary user'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.

JF - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) CY - Cesme, Turkey ER - TY - CONF T1 - Performance Analysis of Multiuser Detection for Multibeam Satellites Under Rain Fading T2 - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) Y1 - 2012 A1 - Arnau, Jesus A1 - C. Mosquera KW - dynacs KW - hybrid beamforming KW - multibeam satellites. KW - Multiuser detection KW - rain fading KW - satcom AB -

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.

JF - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) CY - Baiona, Spain ER - TY - JOUR T1 - Performance study of multiuser interference mitigation schemes for hybrid broadband multibeam satellite architectures JF - EURASIP Journal on Wireless Communications and Networking Y1 - 2012 A1 - Arnau, Jesus A1 - Bertrand Devillers A1 - C. Mosquera A1 - Ana Pérez-Neira VL - 2012 UR - http://jwcn.eurasipjournals.com/content/2012/1/132 ER - TY - CONF T1 - Understanding statistical disclosure: A least squares approach T2 - Privacy Enhancing Technologies Symposium (PETS) Y1 - 2012 A1 - Fernando Pérez-González A1 - Carmela Troncoso JF - Privacy Enhancing Technologies Symposium (PETS) CY - Vigo, Spain ER - TY - CONF T1 - On the Application of a Hybrid Harmony Search Algorithm to Node Localization in Anchor-based Wireless Sensor Networks T2 - IEEE International Conference on Intelligent Systems Design and Applications (ISDA) Y1 - 2011 A1 - Diana Manjarres A1 - Javier Del Ser A1 - Sergio Gil-Lopez A1 - Massimo Vecchio A1 - Itziar Landa-Torres A1 - R. López-Valcarce JF - IEEE International Conference on Intelligent Systems Design and Applications (ISDA) ER - TY - CONF T1 - Bandlimited or Constant Envelope? Exploiting Waveform Properties in Wireless Microphone Detection T2 - International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) Y1 - 2011 A1 - Daniel Romero A1 - R. López-Valcarce KW - Bandlimited signals. KW - Constant Magnitude KW - dynamic spectrum access KW - Wireless Microphones JF - International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) CY - San Juan, Puerto Rico ER - TY - JOUR T1 - Bit Loading Using Imperfect CSIT for Prediction-Based Resource Allocation in Mobile OFDMA JF - Vehicular Technology, IEEE Transactions on Y1 - 2011 A1 - Schmidt, J.F. A1 - Cousseau, J.E. A1 - Wichman, R. A1 - Werner, S. KW - bit loading KW - channel state information in the transmitter KW - CSIT KW - frequency division multiple access KW - imperfect channel prediction information KW - mobile OFDMA KW - mobile radio KW - mobile stations KW - OFDM modulation KW - orthogonal frequency division multiple access KW - prediction error KW - prediction-based resource allocation KW - radio transmitters KW - time-varying channels KW - wireless channel VL - 60 ER - TY - CONF T1 - On the Co-existence of Primary and Secondary Transmitters in a Broadcast Network T2 - International Conference on Cognitive Radio and Advanced Spectrum Management Y1 - 2011 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - Broadcast KW - cognitive radio KW - Overlay KW - Single Frequency Network JF - International Conference on Cognitive Radio and Advanced Spectrum Management CY - Barcelona, Catalonia, Spain ER - TY - CONF T1 - Detection diversity of multiantenna spectrum sensors T2 - IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011) Y1 - 2011 A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - Ashish Pandharipande KW - cognitive radio KW - detection diversity KW - spectrum sensing AB -
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.
JF - IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011) PB - IEEE CY - Prague, Czech Republic ER - TY - JOUR T1 - Detection of Rank-P Signals in Cognitive Radio Networks With Uncalibrated Multiple Antennas JF - IEEE Trans. on Signal Processing Y1 - 2011 A1 - David Ramírez A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - Javier Vía A1 - Ignacio Santamaría KW - cognitive radio KW - dynacs KW - spectrum sensing AB -
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.
VL - 59 IS - 8 ER - TY - CONF T1 - A Dirty Paper Scheme for Hierarchical OFDM T2 - IEEE International Conference on Communications (ICC) Y1 - 2011 A1 - Scagliola, Michele A1 - Fernando Pérez-González A1 - Guccione, Pietro KW - dirty paper KW - Hierarchical OFDM KW - watermarking JF - IEEE International Conference on Communications (ICC) CY - Kioto, Japan ER - TY - CONF T1 - Distributed spectrum sensing with multiantenna sensors under calibration errors T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2011 A1 - Daniel Romero A1 - R. López-Valcarce KW - ad hoc detectors KW - antenna arrays KW - calibration KW - calibration errors KW - cognitive radio KW - energy detector KW - generalized likelihood ratio KW - log normal distribution KW - lognormal shadowing KW - multiantenna sensors KW - Ricean fading KW - spectrum sensing KW - wireless medium AB -

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.

JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) ER - TY - CONF T1 - An Effective Metaheuristic Approach to Node Localization in Wireless Sensor Networks T2 - IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS) Y1 - 2011 A1 - Massimo Vecchio A1 - R. López-Valcarce A1 - Francesco Marcelloni JF - IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS) ER - TY - CONF T1 - Efficient Protocols for Secure Adaptive Filtering T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2011 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - adaptive filtering KW - privacy KW - security KW - watermarking JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Prage, Czech Republic ER - TY - CONF T1 - Encrypted Domain Processing for Cloud Privacy: Concept and Practical Experience T2 - International Conference on Cloud Computing and Services Science (CLOSER) Y1 - 2011 A1 - Daniel A. Rodríguez-Silva A1 - F. Javier González-Castaño A1 - Lilian Adkinson-Orellana A1 - Alexandre Fernández-Cordeiro A1 - Juan Ramón Troncoso-Pastoriza A1 - Daniel González-Martínez KW - cloud KW - privacy KW - security KW - watermarking JF - International Conference on Cloud Computing and Services Science (CLOSER) CY - Noordwijkerhout, The Netherlands ER - TY - CONF T1 - Exposing original and duplicated regions using SIFT features and resampling traces T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2011 A1 - David Vázquez-Padín A1 - Fernando Pérez-González KW - Image forensics KW - region duplication KW - resampling estimation KW - SIFT AB -

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.

 

JF - International Workshop on Digital Watermarking (IWDW) PB - Springer Berlin Heidelberg CY - Atlantic City, USA ER - TY - JOUR T1 - Gain-Invariant Dirty Paper Coding for Hierarchical OFDM JF - IEEE Transactions on Communications Y1 - 2011 A1 - Scagliola, Michele A1 - Fernando Pérez-González A1 - Guccione, Pietro KW - dirty paper KW - dynacs KW - Hierarchical OFDM KW - watermarking AB -

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.

VL - 59 ER - TY - CONF T1 - Hybrid Space-Ground Processing for High-Capacity Multi-beam Satellite Systems T2 - IEEE GLOBECOM Y1 - 2011 A1 - Arnau, Jesus A1 - Michael Bergmann A1 - Enzo Alberto Candreva A1 - Giovanni Emanuele Corazza A1 - Riccardo {De Gaudenzi} A1 - Bertrand Devillers A1 - Wilfried Gappmair A1 - Francesco Lombardo A1 - C. Mosquera A1 - Ana Pérez-Neira A1 - Ilaria Thibault A1 - Alessandro Vanelli-Coralli JF - IEEE GLOBECOM CY - Houston, Texas, USA N1 - Selected Areas in Communications Symposium - Satellite & Space Communications Track (GC'11 - SAC - SSC) ER - TY - CONF T1 - Improving the Visual Performance of S/DISCUS T2 - IEEE International Conference on Multimedia and Expo (ICME) Y1 - 2011 A1 - Gabriel Domínguez-Conde A1 - Deepa Kundur KW - distributed source coding KW - keyless security KW - low-complexity video coding KW - Slepian-Wolf coding KW - watermarking KW - wireless multimedia sensor networks JF - IEEE International Conference on Multimedia and Expo (ICME) CY - Barcelona, Catalonia ER - TY - THES T1 - Interference and Network Management in Cognitive Communication Systems Y1 - 2011 A1 - Gonzalo Vázquez-Vilar KW - cognitive radio KW - spectrum sensing PB - University of Vigo CY - Vigo, Spain VL - Ph.D. ER - TY - CONF T1 - Joint Linear Precoding and Beamforming for the Forward Link of Multi-Beam Broadband Satellite Systems T2 - IEEE GLOBECOM Y1 - 2011 A1 - Bertrand Devillers A1 - Ana Isabel Perez A1 - C. Mosquera JF - IEEE GLOBECOM CY - Houston, Texas, USA N1 - Selected Areas in Communications Symposium - Satellite & Space Communications Track (GC'11 - SAC - SSC) ER - TY - JOUR T1 - Low-Complexity Channel Prediction Using Approximated Recursive DCT JF - Circuits and Systems I: Regular Papers, IEEE Transactions on Y1 - 2011 A1 - Schmidt, J.F. A1 - Cousseau, J.E. A1 - Wichman, R. A1 - Werner, S. KW - autoregressive modeling KW - autoregressive processes KW - basis expansion model KW - channel estimator KW - computational complexity KW - DCT KW - discrete cosine transform KW - discrete cosine transforms KW - Doppler frequencies KW - filter bank KW - Kalman filters KW - low-complexity channel prediction KW - OFDM modulation KW - OFDM systems KW - recursive formulation KW - steady-state Kalman filter KW - sum-of-sinusoids channel predictors KW - time-varying channels VL - 58 ER - TY - CONF T1 - Multiantenna detection of constant-envelope signals in noise of unknown variance T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2011 A1 - Daniel Romero A1 - R. López-Valcarce KW - cognitive radio KW - multiantenna detection KW - spectrum sensing AB -

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.

JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) ER - TY - CONF T1 - Multiantenna detection under noise uncertainty and primary user's spatial structure T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2011 A1 - David Ramírez A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - Javier Vía A1 - Ignacio Santamaría KW - cognitive radio KW - generalized likelihood ratio test (GLRT) KW - spectrum sensing JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Prage, Czech Republic ER - TY - JOUR T1 - Multiantenna Spectrum Sensing Exploiting Spectral a priori Information JF - IEEE Trans. on Wireless Communications Y1 - 2011 A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - Josep Sala KW - cognitive radio KW - dynacs KW - spectrum sensing VL - 10 IS - 12 ER - TY - CONF T1 - A new method for perspective correction of document images T2 - Document Recognition and Retrieval Y1 - 2011 A1 - José Rodríguez-Piñeiro A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Alberto Malvido KW - Document image KW - perspective distortion correction KW - watermarking JF - Document Recognition and Retrieval T3 - Proc. of SPIE PB - SPIE CY - San Francisco, CA VL - 7874 ER - TY - CONF T1 - Prediction based resource allocation in OFDMA T2 - Information Sciences and Systems (CISS), 2011 45th Annual Conference on Y1 - 2011 A1 - Schmidt, J.F. A1 - Cousseau, J.E. A1 - Wichman, R. A1 - Werner, S. KW - empirical characterization KW - frequency division multiple access KW - low-complexity channel predictor KW - mobile radio KW - mobile stations KW - mobile wireless channels KW - OFDM modulation KW - OFDMA downlink KW - orthogonal frequency division multiple access downlink KW - perfect channel state information KW - prediction error characterization KW - prediction-based RA strategies KW - prediction-based resource allocation algorithm KW - wireless channels JF - Information Sciences and Systems (CISS), 2011 45th Annual Conference on ER - TY - CONF T1 - Prefilter Design for Forensic Resampling Estimation T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2011 A1 - David Vázquez-Padín A1 - Fernando Pérez-González AB -

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.

JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - Foz do Iguaçu, Brazil ER - TY - JOUR T1 - Secure Adaptive Filtering JF - IEEE Transactions on Information Forensics and Security Y1 - 2011 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - adaptive signal processing KW - computational complexity KW - cryptography KW - digital data protection KW - encrypted domain KW - homomorphic encryption systems KW - least mean squares algorithm KW - least mean squares methods KW - privacy KW - secure adaptive filtering KW - security KW - signal privacy preservation KW - SPED techniques KW - watermarking VL - 6 ER - TY - CONF T1 - Solving the Node Localization Problem in WSNs by a Two-objective Evolutionary Algorithm and Gradient Descent T2 - the 3-th IEEE World Congress on Nature and Biologically Inspired Computing (NaBIC 2011) Y1 - 2011 A1 - Massimo Vecchio A1 - R. López-Valcarce A1 - Francesco Marcelloni JF - the 3-th IEEE World Congress on Nature and Biologically Inspired Computing (NaBIC 2011) ER - TY - JOUR T1 - Spectrum Sensing Exploiting Guard Bands and Weak Channels JF - IEEE Trans. on Signal Processing Y1 - 2011 A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce KW - cognitive radio KW - dynacs KW - spectrum sensing AB -
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.
VL - 59 IS - 12 ER - TY - CONF T1 - A study on the Application of Different Two-objective Evolutionary Algorithms to the Node Localization Problem in Wireless Sensor Networks T2 - IEEE International Conference on Intelligent Systems Design and Applications (ISDA) Y1 - 2011 A1 - Massimo Vecchio A1 - R. López-Valcarce A1 - Francesco Marcelloni JF - IEEE International Conference on Intelligent Systems Design and Applications (ISDA) ER - TY - JOUR T1 - A two-objective evolutionary approach based on topological constraints for node localization in wireless sensor networks JF - Applied Soft Computing Y1 - 2011 A1 - Massimo Vecchio A1 - R. López-Valcarce A1 - Francesco Marcelloni KW - dynacs KW - Multiobjective evolutionary algorithms KW - Node localization KW - Range measurements KW - Stochastic optimization KW - wsn AB -

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.

VL - 12 IS - 7 ER - TY - CONF T1 - Weber's law-based side-informed data hiding T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2011 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data hiding KW - Logarithmic watermarking KW - Perceptually shaped watermarks KW - watermarking KW - Weber's law JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Prague, Czech Republic ER - TY - CONF T1 - Witsenhausen's counterexample and its links with multimedia security problems T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2011 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Chaouki T. Abdallah KW - control KW - Multimedia security KW - Witsenhausen's counterexample JF - International Workshop on Digital Watermarking (IWDW) CY - Atlantic City, USA ER - TY - JOUR T1 - Asymptotically Optimum Universal Watermark Embedding and Detection in the High-SNR Regime JF - IEEE Transactions on Information Theory Y1 - 2010 A1 - Pedro Comesaña A1 - Neri Merhav A1 - Mauro Barni KW - hypothesis testing KW - Neyman-Pearson KW - watermark detection KW - watermark embedding KW - watermarking VL - 56 ER - TY - JOUR T1 - Blind l_1-Norm-Based Phase Estimation for Cross-QAM Robust to Finite Precision Effects JF - Signal Processing Y1 - 2010 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce A1 - Iago Gómez-Alonso KW - blind phase estimation KW - carrier offset KW - cross-QAM constellations KW - fixed point implementation VL - 90 N1 - Accepted for publication ER - TY - JOUR T1 - Closed-form real single-tone frequency estimator based on a normalized IIR notch filter JF - Signal Processing Y1 - 2010 A1 - R. Elasmi-Ksibi A1 - S. Cherif A1 - R. López-Valcarce A1 - H. Besbes KW - Frequency estimation KW - IIR notchfilter KW - Least squares KW - Real sinusoid KW - RPHD estimator VL - 90 ER - TY - CONF T1 - CryptoDSPs for Cloud Privacy T2 - International Workshop on Cloud Information System Engineering (CISE) Y1 - 2010 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - cloud KW - privacy KW - security KW - watermarking JF - International Workshop on Cloud Information System Engineering (CISE) T3 - LNCS CY - Hong Kong, China VL - 6724 ER - TY - THES T1 - Design of Nonlinear Precoding and Estimation Schemes for Advanced Communication Systems Y1 - 2010 A1 - Marcos Álvarez-Díaz KW - adaptive signal processing KW - satcom VL - Ph.D. ER - TY - JOUR T1 - Dynamic spectrum leasing (DSL): A new paradigm for spectrum sharing in cognitive radio networks JF - IEEE Transactions on Vehicular Technology Y1 - 2010 A1 - Sudhaman K. Jayaweera A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera KW - cognitive radio KW - DSL KW - dynamic spectrum access KW - dynamic spectrum leasing KW - dynamic spectrum sharing KW - game theory KW - power control VL - 59 ER - TY - CONF T1 - Dynamic Spectrum Leasing (DSL) in Dynamic Channels T2 - ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) Y1 - 2010 A1 - Georges El-Howayek A1 - Sudhaman K. Jayaweera A1 - Kamrul Hakim A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera KW - cognitive radio KW - DSL KW - dynamic spectrum leasing KW - game theory KW - Rayleigh fading KW - time-varying channels KW - time-varying secondary system JF - ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) CY - Cape Town, South Africa ER - TY - JOUR T1 - Efficient Dynamic Spectrum Sharing in Cognitive Radio Networks: Centralized Dynamic Spectrum Leasing (C-DSL) JF - IEEE Transactions on Wireless Communications Y1 - 2010 A1 - Kamrul Hakim A1 - Sudhaman K. Jayaweera A1 - Georges El-Howayek A1 - C. Mosquera VL - 9 ER - TY - CONF T1 - A finite interval constant modulus criterion for multicarrier channel shortening T2 - European Wireless Y1 - 2010 A1 - E. Ben Salem A1 - R. López-Valcarce A1 - H. Besbes A1 - S. Cherif JF - European Wireless CY - Lucca, Italy ER - TY - JOUR T1 - Frequency estimation of real-valued single-tone in colored noise using multiple autocorrelation lags JF - Signal Processing Y1 - 2010 A1 - R. Elasmi-Ksibi A1 - H. Besbes A1 - R. López-Valcarce A1 - S. Cherif KW - Autocorrelation KW - Frequency estimation KW - Single sinusoid VL - 90 ER - TY - JOUR T1 - Joint NDA Estimation of Carrier Frequency/Phase and SNR for Linearly Modulated Signals JF - IEEE Signal Processing Letters Y1 - 2010 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera KW - Carrier offset estimation KW - Cramer-Rao lower bound KW - expectation-maximization algorithm KW - SNR estimation VL - 17 ER - TY - JOUR T1 - Leaving Timing Channel Fingerprints in Hidden Service Log Files JF - Digital Investigation Y1 - 2010 A1 - Bilal Shebaro A1 - Fernando Pérez-González A1 - Jedidiah R. Crandall KW - data-hiding KW - fingerprints KW - hidden services KW - timestamps KW - timing channel KW - tor network KW - watermarking N1 - doi:10.1016/j.diin.2010.05.013 ER - TY - CONF T1 - Leaving Timing Channel Fingerprints in Hidden Service Log Files T2 - Digital Forensic Research Workshop Annual Conference (DFRWS) Y1 - 2010 A1 - Bilal Shebaro A1 - Fernando Pérez-González A1 - Jedidiah R. Crandall KW - data hiding KW - fingerprints KW - hidden services KW - timestamps KW - timing channel KW - tor network KW - watermarking JF - Digital Forensic Research Workshop Annual Conference (DFRWS) CY - Portland, Oregon ER - TY - CONF T1 - Multiantenna spectrum sensing: detection of spatial correlation among time-series with unknown spectra T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2010 A1 - David Ramírez A1 - Javier Vía A1 - Ignacio Santamaría A1 - R. López-Valcarce A1 - L. L. Scharf KW - cognitive radio KW - coherence spectrum KW - generalized likelihood ratio test KW - Hadamard ratio KW - multiple-channel signal detection JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Dallas, TX ER - TY - CONF T1 - Multiantenna spectrum sensing for Cognitive Radio: overcoming noise uncertainty T2 - International Workshop on Cognitive Information Processing (CIP) Y1 - 2010 A1 - R. López-Valcarce A1 - Gonzalo Vázquez-Vilar A1 - Josep Sala JF - International Workshop on Cognitive Information Processing (CIP) CY - Elba Island, Italy ER - TY - CONF T1 - A new model for Gabor Coefficients' Magnitude in Face Recognition T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2010 A1 - Juan Ramón Troncoso-Pastoriza A1 - Daniel González-Jiménez A1 - Fernando Pérez-González KW - Gabor coefficients KW - generalized Gaussian KW - Magnitude KW - Quantization KW - Statistical Model KW - watermarking JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Dallas, USA ER - TY - CONF T1 - Performance Analysis of Distributed Tracking with Consensus on Noisy Time-Varying Graphs T2 - Advanced Satellite Multimedia Systems Conference (ASMA) Y1 - 2010 A1 - Yongxiang Ruan A1 - Sudhaman K. Jayaweera A1 - C. Mosquera KW - connectivity graph KW - distributed local Kalman filtering KW - distributed tracking KW - distributed tracking with consensus KW - graph topology KW - network theory (graphs) KW - noisy communications links KW - noisy time-varying graphs KW - performance analysis KW - telecommunication links KW - telecommunication network topology KW - time-varying network topology KW - time-varying systems JF - Advanced Satellite Multimedia Systems Conference (ASMA) CY - Cagliari, Italy ER - TY - JOUR T1 - Primary User Enters the Game: Performance of Dynamic Spectrum Leasing in Cognitive Radio Networks JF - IEEE Transactions on Wireless Communications Y1 - 2010 A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera A1 - Sudhaman K. Jayaweera ER - TY - CONF T1 - On the Role of Differentiation for Resampling Detection T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2010 A1 - Nahuel Dalgaard A1 - C. Mosquera A1 - Fernando Pérez-González KW - cyclostationarity KW - Image forensics KW - interpolation KW - prefiltering KW - resampling detection KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Hong Kong, China ER - TY - CONF T1 - Secure and Private Medical Clouds using Encrypted Processing T2 - Virtual Physiological Human (VPH) Y1 - 2010 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - cloud KW - privacy KW - security KW - watermarking JF - Virtual Physiological Human (VPH) CY - Brussels, Belgium ER - TY - JOUR T1 - SNR Estimation for Multilevel Constellations Using Higher-Order Moments JF - IEEE Transactions on Signal Processing Y1 - 2010 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce A1 - C. Mosquera KW - Blind estimation KW - higher-order statistics KW - Moments-based estimation KW - SNR estimation VL - 58 ER - TY - JOUR T1 - Stepsize Sequence Design for Distributed Average Consensus JF - IEEE Signal Processing Letters Y1 - 2010 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Sudhaman K. Jayaweera VL - 17 ER - TY - CONF T1 - Two-dimensional Statistical Test for the Presence of Almost Cyclostationarity on Images T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2010 A1 - David Vázquez-Padín A1 - C. Mosquera A1 - Fernando Pérez-González KW - cyclostationarity KW - Image forensics KW - interpolation KW - resampling factor estimation KW - spatial transformation KW - watermarking AB -

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.

JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Hong Kong, China ER - TY - CONF T1 - Wideband Spectral Estimation from Compressed Measurements Exploiting Spectral a priori Information in Cognitive Radio Systems T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2010 A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - C. Mosquera A1 - Nuria González-Prelcic KW - cognitive radio KW - compressive sampling KW - Spectral estimation JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Dallas, U.S.A. ER - TY - CONF T1 - Blind decoder for binary probabilistic traitor tracing codes T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2009 A1 - Luis Pérez-Freire A1 - Teddy Furon KW - collusion KW - information theory KW - Tardos KW - Traitor tracing KW - watermarking JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - London, UK ER - TY - JOUR T1 - Cramer-Rao Lower Bound and EM Algorithm for Envelope-Based SNR Estimation of Nonconstant Modulus Constellations JF - IEEE Transactions on Communications Y1 - 2009 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera VL - 57 ER - TY - CONF T1 - A Dynamic Spectrum Leasing (DSL) Framework for Spectrum Sharing in Cognitive Radio Networks T2 - Asilomar Conference on Signals, Systems and Computers Y1 - 2009 A1 - Sudhaman K. Jayaweera A1 - C. Mosquera JF - Asilomar Conference on Signals, Systems and Computers ER - TY - CONF T1 - EM decoding of Tardos traitor tracing codes T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2009 A1 - Teddy Furon A1 - Luis Pérez-Freire KW - collusion channel KW - Expectation-Maximization KW - iterative decoding KW - Tardos code KW - Traitor tracing KW - watermarking JF - ACM Workshop on Multimedia and Security (MMSEC) CY - Princeton, NJ, USA ER - TY - CONF T1 - Estimating the minimal length of Tardos code T2 - International Workshop on Information Hiding (IH) Y1 - 2009 A1 - Teddy Furon A1 - Luis Pérez-Freire A1 - Arnaud Guyader A1 - Frédéric Cérou KW - Fingerprinting KW - Rare event KW - Tardos code KW - Traitor tracing KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science CY - Darmstadt, Germany ER - TY - CONF T1 - AN EXTENDED ANALYSIS OF DISCRETE FOURIER TRANFORM - RATIONAL DITHER MODULATION FOR NON-WHITE HOSTS T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2009 A1 - Scagliola, Michele A1 - Fernando Pérez-González A1 - Guccione, Pietro KW - data hiding KW - dither modulation KW - filtering KW - non-white Gaussian hosts KW - watermarking JF - IEEE International Workshop on Information Forensics and Security (WIFS) PB - IEEE CY - London, U.K. ER - TY - JOUR T1 - High-rate data-hiding robust to linear filtering for colored hosts JF - EURASIP Journal on Information Security Y1 - 2009 A1 - Scagliola, Michele A1 - Fernando Pérez-González A1 - Guccione, Pietro KW - data-hiding KW - rational dither modulation KW - watermarking ER - TY - CONF T1 - Model-based steganalysis using invariant features T2 - Media Forensics and Security Y1 - 2009 A1 - Tu-Thach Quach A1 - Fernando Pérez-González A1 - Gregory L. Heileman KW - Invariant features KW - Model-based KW - Steganalysis JF - Media Forensics and Security CY - San Jose, CA, U.S.A. ER - TY - CONF T1 - Modeling Magnitudes of Gabor Coefficients: The β-Rayleigh Distribution T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2009 A1 - Daniel González-Jiménez A1 - Enrique Argones-Rúa A1 - Fernando Pérez-González A1 - José Luis Alba-Castro KW - Gabor KW - generalized Gaussian KW - Rayleigh KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Cairo, Egypt ER - TY - CONF T1 - Multiantenna detection of multicarrier primary signals exploiting spectral a priori information T2 - International Conference on Cognitive Radio Oriented Wireless Networks and Communications (Crowncom) Y1 - 2009 A1 - R. López-Valcarce A1 - Gonzalo Vázquez-Vilar A1 - Marcos Álvarez-Díaz JF - International Conference on Cognitive Radio Oriented Wireless Networks and Communications (Crowncom) CY - Hannover, Germany ER - TY - CONF T1 - Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2009 A1 - Gabriel Domínguez-Conde A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - cryptography KW - error statistics KW - false negative probabilities KW - false positive probabilities KW - Fridrich-Goljan self-embedding authentication method KW - hash bit errors KW - image authentication method KW - image coding KW - message authentication KW - performance analysis KW - robust hashing KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) CY - Cairo, Egypt ER - TY - JOUR T1 - Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method JF - IEEE Transactions on Information Forensics and Security Y1 - 2009 A1 - Gabriel Domínguez-Conde A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - cryptography KW - error statistics KW - false negative probabilities KW - false positive probabilities KW - Fridrich-Goljan self-embedding authentication method KW - hash bit errors KW - image authentication method KW - image coding KW - message authentication KW - performance analysis KW - robust hashing KW - watermarking VL - 4 ER - TY - CONF T1 - Secure Direct and Iterative Protocols for Solving Systems of Linear Equations T2 - Signal Processing in the Encrypted Domain (SPEED) Workshop Y1 - 2009 A1 - Juan Ramón Troncoso-Pastoriza A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - iterative protocol KW - privacy KW - security KW - systems of linear equations KW - watermarking JF - Signal Processing in the Encrypted Domain (SPEED) Workshop CY - Lausanne, Switzerland ER - TY - CONF T1 - Skewed Log-Stable model for natural images pixel block-variance T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2009 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - Doubly stochastic model KW - Image block-variance KW - Log-stable distribution KW - Lognormal distribution KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Cairo, Egypt ER - TY - JOUR T1 - Spread spectrum watermarking security JF - IEEE Transactions on Information Forensics and Security Y1 - 2009 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking VL - 4 ER - TY - CONF T1 - A Unified Framework for Dynamic Spectrum Leasing (DSL) in Cognitive Radios T2 - IEEE Broadband Wireless Access Workshop Y1 - 2009 A1 - Sudhaman K. Jayaweera A1 - Kamrul Hakim A1 - C. Mosquera JF - IEEE Broadband Wireless Access Workshop N1 - colocated with Globecom ER - TY - CONF T1 - Videosurveillance and privacy: covering the two sides of the mirror with DRM T2 - ACM Workshop on Digital Rights Management (DRM) Y1 - 2009 A1 - Juan Ramón Troncoso-Pastoriza A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - access control KW - privacy KW - rights management KW - security KW - videosurveillance KW - watermarking JF - ACM Workshop on Digital Rights Management (DRM) PB - ACM CY - Chicago, IL, USA ER - TY - CONF T1 - Wideband Spectrum Sensing in Cognitive Radio: Joint Estimation of Noise Variance and Multiple Signal Levels T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2009 A1 - R. López-Valcarce A1 - Gonzalo Vázquez-Vilar JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Perugia, Italy ER - TY - CONF T1 - Worst case attacks against binary probabilistic traitor tracing codes T2 - IEEE International Workshop on Information Forensics and Security (WIFS) Y1 - 2009 A1 - Teddy Furon A1 - Luis Pérez-Freire KW - collusion KW - information theory KW - Tardos KW - Traitor tracing KW - watermarking JF - IEEE International Workshop on Information Forensics and Security (WIFS) CY - London, UK ER - TY - CONF T1 - Asymptotically optimum embedding strategy for one-bit watermarking under Gaussian attacks T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2008 A1 - Pedro Comesaña A1 - Neri Merhav A1 - Mauro Barni ED - Edward J. Delp ED - Ping W. Wong ED - Jana Dittmann ED - Nasir D. Memon JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, CA, USA VL - 6819 ER - TY - THES T1 - Digital Watermarking Security Y1 - 2008 A1 - Luis Pérez-Freire KW - data-hiding KW - security KW - watermarking PB - University of Vigo, Spain ER - TY - CONF T1 - Distortion Optimization of Model-Based Secure Embedding Schemes for Data-Hiding T2 - International Workshop on Information Hiding (IH) Y1 - 2008 A1 - Benjamin Mathon A1 - Patrick Bas A1 - François Cayre A1 - Fernando Pérez-González KW - data hiding KW - Distortion Optimization KW - Secure Embedding JF - International Workshop on Information Hiding (IH) CY - Santa Barbara, CA, U.S.A. ER - TY - CONF T1 - Distributed Estimation: Do Not Trust Gossips T2 - Sensor, Signal and Information Processing (SenSIP) Workshop Y1 - 2008 A1 - C. Mosquera A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - Sensor, Signal and Information Processing (SenSIP) Workshop CY - Sedona (Arizona) ER - TY - CONF T1 - Distributed Estimation with Noisy Exchanges T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications Y1 - 2008 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications CY - Recife, Brazil ER - TY - JOUR T1 - Distributed Sequential Estimation with Noisy, Correlated Observations JF - IEEE Signal Processing Letters Y1 - 2008 A1 - Sudhaman K. Jayaweera A1 - C. Mosquera VL - 15 ER - TY - CONF T1 - Entangled Kalman Filters for Cooperative Estimation T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop Y1 - 2008 A1 - C. Mosquera A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - IEEE Sensor Array and Multichannel Signal Processing Workshop CY - Darmstadt (Germany) ER - TY - CONF T1 - A family of frequency estimators using higher-order sample covariance lags for real sinusoid detection T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2008 A1 - R. Elasmi-Ksibi A1 - R. López-Valcarce A1 - H. Besbes A1 - S. Cherif A1 - M. Jaidane KW - Frequency estimator KW - Sinusoid detection JF - European Signal Processing Conference (EUSIPCO) CY - Lausanne, Switzerland ER - TY - CONF T1 - Lattice implementation of Sum-squared Auto-correlation Minimization (SAM) channel shortener T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2008 A1 - E. Ben Salem A1 - R. López-Valcarce A1 - S. Cherif A1 - H. Besbes KW - Blind Adaptation KW - Lattice KW - SAM JF - European Signal Processing Conference (EUSIPCO) CY - Lausanne, Switzerland ER - TY - CONF T1 - Maximum Likelihood SNR Estimation for Asynchronously Oversampled OFDM Signals T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications Y1 - 2008 A1 - R. López-Valcarce A1 - C. Mosquera KW - estimation KW - ML KW - OFDM KW - SNR JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications CY - Recife, Brazil ER - TY - CONF T1 - ML and EM Algorithm for non-data-aided SNR Estimation of Linearly Modulated Signals T2 - International Symposium on Communication Systems, Networks and Signal Processing (CNSDSP) Y1 - 2008 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera KW - EM KW - ML KW - SNR estimation JF - International Symposium on Communication Systems, Networks and Signal Processing (CNSDSP) ER - TY - JOUR T1 - Non-Data-Aided Symbol Rate Estimation of Linearly Modulated Signals JF - IEEE Transactions on Signal Processing Y1 - 2008 A1 - C. Mosquera A1 - Sandro Scalise A1 - R. López-Valcarce ER - TY - JOUR T1 - Quantization-Based Data-Hiding Robust to Linear Time-Invariant Filtering JF - IEEE Transactions on Information Forensics and Security Y1 - 2008 A1 - Fernando Pérez-González A1 - C. Mosquera KW - data-hiding KW - watermarking VL - 3 ER - TY - JOUR T1 - Quantization-Based Methods: Additive Attacks Performance Analysis JF - Transactions on Data Hiding and Multimedia Security III Y1 - 2008 A1 - Jose Emilio Vila-Forcén A1 - Sviatoslav Voloshynovskiy A1 - Oleksiy Koval A1 - Fernando Pérez-González A1 - Thierry Pun KW - data-hiding KW - watermarking VL - 4920 ER - TY - JOUR T1 - Security of lattice-based data hiding against the Watermarked Only Attack JF - IEEE Transactions on Information Forensics and Security Y1 - 2008 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking VL - 3 ER - TY - CONF T1 - SNR Estimation with Heterogeneous Frames T2 - Advanced Satellite Mobile Systems Conference Y1 - 2008 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce A1 - C. Mosquera JF - Advanced Satellite Mobile Systems Conference CY - Bologna, Italy ER - TY - CONF T1 - Benford's Law in Image Processing T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2007 A1 - Fernando Pérez-González A1 - Gregory L. Heileman A1 - Chaouki T. Abdallah KW - benford KW - benford's-law JF - IEEE International Conference on Image Processing (ICIP) CY - San Antonio, TX, USA ER - TY - JOUR T1 - Breaking the BOWS Watermarking System: Key Guessing and Sensitivity Attacks JF - EURASIP Journal on Information Security Y1 - 2007 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data-hiding KW - oracle KW - sensitivity KW - watermarking VL - 2007 N1 - Vol 2007, Article ID 25308, 8 pages. doi:10.1155/2007/25308. Source code available here ER - TY - CONF T1 - On the capacity of stegosystems T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2007 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data-hiding KW - steganography KW - watermarking JF - ACM Workshop on Multimedia and Security (MMSEC) CY - Dallas, TX, USA ER - TY - BOOK T1 - Comunicaciones Digitales Y1 - 2007 A1 - Antonio Artés-Rodríguez A1 - Fernando Pérez-González A1 - Jesús Cid-Sueiro A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-Cruz PB - Pearson - Prentice Hall ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - C. Mosquera A1 - M. L. Boucheret A1 - M. Bousquet A1 - S. Cioni A1 - Wilfried Gappmair A1 - R. Pedone A1 - Sandro Scalise A1 - P. Skoutaridis A1 - M. Villanti PB - Springer ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - R. Pedone A1 - G. Albertazzi A1 - P.T. Mathiopoulos A1 - C. Mosquera A1 - N. Sagias A1 - M. Villanti PB - Springer ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - A. A. Rontogiannis A1 - Marcos Álvarez-Díaz A1 - M. Casadei A1 - V. Dalakas A1 - A. Duverdier A1 - F. J. González-Serrano A1 - M. Iubatti A1 - T. Javornik A1 - L. Lapierre A1 - Neri, Massimo A1 - P. Salmi PB - Springer CY - New York ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - Sandro Scalise A1 - L. Castanet A1 - M. Luglio A1 - Neri, Massimo A1 - Marcos Álvarez-Díaz A1 - J. Bito A1 - M. Bousquet A1 - I. Frigyes A1 - P. Horvath A1 - Axel Jahn A1 - M. Krejcarek A1 - J. Lemorton A1 - S. Morosi A1 - M. A. Vázquez-Castro PB - Springer CY - New York ER - TY - CONF T1 - Disclosing secrets in watermarking and data hiding T2 - Third Wavila Challenge (WaCha) Y1 - 2007 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking JF - Third Wavila Challenge (WaCha) T3 - ECRYPT proceedings series from the Otto-von-Guericke University, Magdeburg, Germany CY - Saint-Malo, France ER - TY - CONF T1 - On Distortion Measures Associated to Random Desynchronization Attacks T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2007 A1 - Félix Balado A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - desynchronization KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA ER - TY - CONF T1 - Dither modulation in the logarithmic domain T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2007 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - International Workshop on Digital Watermarking (IWDW) CY - Guangzhou, China ER - TY - CONF T1 - Efficient Non-Interactive Zero-Knowledge Watermark Detector Robust to Sensitivity Attacks T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2007 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - sensitivity KW - watermarking KW - zero-knowledge JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA ER - TY - JOUR T1 - Efficient Zero-Knowledge Watermark Detection with Improved Robustness to Sensitivity Attacks JF - EURASIP Journal on Information Security Y1 - 2007 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - data-hiding KW - sensitivity KW - watermarking KW - zero-knowledge N1 - Special Issue on Signal Processing in the Encrypted Domain ER - TY - CONF T1 - Exploiting security holes in lattice data hiding T2 - International Workshop on Information Hiding (IH) Y1 - 2007 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg CY - Saint-Malo, France ER - TY - CONF T1 - Fast-fading channel estimator using DCT and simplified kalman filter T2 - Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on Y1 - 2007 A1 - Schmidt, J.F. A1 - Cousseau, J.E. A1 - Wichman, R. A1 - Gregorio, F.H. KW - band-pass filters KW - basis function approximations KW - channel coefficient KW - channel Doppler spectrum KW - channel estimation KW - channel estimator KW - channel variations KW - decoupled parameters KW - discrete cosine transform KW - discrete cosine transforms KW - Doppler effect KW - fading channels KW - fast-fading channel KW - Kalman filter KW - Kalman filters KW - low complexity estimator KW - narrow-band filters KW - passband filters KW - training symbols JF - Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on ER - TY - CONF T1 - A Generalization of Benford's Law and Its Application to Images T2 - European Control Conference (ECC) Y1 - 2007 A1 - Fernando Pérez-González A1 - Gregory L. Heileman A1 - Chaouki T. Abdallah KW - benford KW - benford's-law JF - European Control Conference (ECC) CY - Kos, Greece ER - TY - CONF T1 - Iterative Envelope-Based SNR Estimation for Non-Constant Modulus Constellations T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2007 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Wilfried Gappmair KW - EM KW - SNR KW - synchronization JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) ER - TY - CONF T1 - Modeling Gabor coefficients via Generalized Gaussian Distributions for face recognition T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2007 A1 - Daniel González-Jiménez A1 - Fernando Pérez-González A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - José Luis Alba-Castro KW - biometrics KW - face-recognition JF - IEEE International Conference on Image Processing (ICIP) CY - San Antonio, TX, USA ER - TY - CONF T1 - Non-Linear Interference Mitigation for Broadband Multimedia Satellite Systems T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2007 A1 - Marcos Álvarez-Díaz A1 - Nicolas Courville A1 - C. Mosquera A1 - Gianluigi Liva A1 - Giovanni Emanuele Corazza JF - International Workshop on Satellite and Space Communications (IWSSC) CY - Salzburg, Austria ER - TY - CONF T1 - A Novel Interpretation of Content Authentication T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2007 A1 - Pedro Comesaña A1 - Félix Balado A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - authentication KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA ER - TY - ABST T1 - Practical estimators of the secret spreading vector for Improved Spread Spectrum modulations. Statistical analysis and results Y1 - 2007 A1 - Luis Pérez-Freire KW - data-hiding KW - security KW - watermarking PB - Signal Theory and Communications Department, University of Vigo, Spain ER - TY - CONF T1 - Privacy Preserving Error Resilient DNA Searching through Oblivious Automata T2 - ACM Conference on Computer and Communications Security (CCS) Y1 - 2007 A1 - Juan Ramón Troncoso-Pastoriza A1 - Stefan Katzenbeisser A1 - Mehmet Celik KW - DNA KW - privacy KW - security KW - watermarking JF - ACM Conference on Computer and Communications Security (CCS) PB - ACM Press CY - Alexandria, Virginia, USA ER - TY - CONF T1 - Putting Reproducible Signal Processing into Practice: A Case Study in Watermarking T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2007 A1 - Mauro Barni A1 - Fernando Pérez-González A1 - Pedro Comesaña A1 - Guido Bartoli KW - data-hiding KW - watermarking JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Honolulu, HW, USA VL - 4 ER - TY - CONF T1 - Satellite Communications: Research Trends and Open Issues T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2007 A1 - Alessandro Vanelli-Coralli A1 - Giovanni Emanuele Corazza A1 - G.K. Karagiannidis A1 - P.T. Mathiopoulos A1 - D.S. Michalopoulos A1 - C. Mosquera A1 - S. Papaharalabos A1 - Sandro Scalise KW - satellite communications JF - International Workshop on Satellite and Space Communications (IWSSC) ER - TY - CONF T1 - A Secure Multidimensional Point Inclusion Protocol T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2007 A1 - Juan Ramón Troncoso-Pastoriza A1 - Stefan Katzenbeisser A1 - Mehmet Celik A1 - Aweke Lemma KW - multiparty computation KW - privacy KW - security KW - watermarking JF - ACM Workshop on Multimedia and Security (MMSEC) CY - Dallas, Texas, USA ER - TY - CONF T1 - Security of Spread-Spectrum-Based Data Hiding T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2007 A1 - Luis Pérez-Freire A1 - Pierre Moulin A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - security KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA ER - TY - JOUR T1 - Sixth-Order Statistics-Based Non-Data-Aided SNR Estimation JF - IEEE Communications Letters Y1 - 2007 A1 - R. López-Valcarce A1 - C. Mosquera VL - 11 ER - TY - CONF T1 - Statistical Analysis of a Linear Algebra Asymmetric Watermarking Scheme T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2007 A1 - G. Boato A1 - C. Fontanari A1 - F. G. B. De Natale A1 - Fernando Pérez-González KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) CY - San Antonio, TX, USA ER - TY - CONF T1 - Two different approaches for attacking BOWS T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2007 A1 - Pedro Comesaña A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - BOWS KW - data-hiding KW - sensitivity KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA ER - TY - CONF T1 - On a watermarking scheme in the logarithmic domain and its perceptual advantages T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2007 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) CY - San Antonio, TX, USA ER - TY - JOUR T1 - An accurate analysis of scalar quantization-based data-hiding JF - IEEE Transactions on Information Forensics and Security Y1 - 2006 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González A1 - Sviatoslav Voloshynovskiy KW - data-hiding KW - security KW - watermarking VL - 1 ER - TY - CONF T1 - On achievable security levels for lattice data hiding in the Known Message Attack scenario T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2006 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González A1 - Teddy Furon KW - data-hiding KW - security KW - watermarking JF - ACM Workshop on Multimedia and Security (MMSEC) PB - ACM CY - Geneva, Switzerland ER - TY - CONF T1 - Analysis of non-data-aided magnitude gain estimators T2 - International Symposium on Image/Video Communications (ISIVC) Y1 - 2006 A1 - R. López-Valcarce KW - Digital Communications KW - gain estimation KW - synchronization JF - International Symposium on Image/Video Communications (ISIVC) CY - Hammamet, Tunisia ER - TY - CONF T1 - Blind carrier phase estimation for non-equiprobable constellations T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2006 A1 - R. López-Valcarce A1 - C. Mosquera KW - Digital Communications KW - phase estimation KW - signal shaping KW - synchronization KW - Tomlinson-Harashima precoding JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Cannes, France ER - TY - JOUR T1 - Blind Newton Sensitivity Attack JF - IEE Proceedings on Information Security Y1 - 2006 A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 153 N1 - To appear ER - TY - CONF T1 - The blind Newton senstivity attack T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2006 A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - JOUR T1 - On distortion-compensated Dither Modulation data-hiding with repetition coding JF - IEEE Transactions on Signal Processing Y1 - 2006 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Félix Balado KW - data-hiding KW - watermarking VL - 54 ER - TY - CONF T1 - High-rate quantization data hiding robust to arbitrary linear filtering attacks T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2006 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Marcos Álvarez-Díaz A1 - Reginald Lagendijk ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - JOUR T1 - The impact of the cropping attack on scalar STDM data hiding JF - IEEE Signal Processing Letters Y1 - 2006 A1 - Pedro Comesaña A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 13 N1 - To appear ER - TY - JOUR T1 - Improving the performance of RDM watermarking by means of trellis coded quantisation JF - IEE Proceedings on Information Security Y1 - 2006 A1 - Andrea Abrardo A1 - Mauro Barni A1 - Fernando Pérez-González A1 - C. Mosquera KW - data-hiding KW - watermarking VL - 153 ER - TY - CONF T1 - A novel model for the print-and-capture channel in 2D bar codes T2 - International Workshop on Multimedia Content Representation, Classification and Security Y1 - 2006 A1 - Alberto Malvido A1 - Fernando Pérez-González A1 - Armando Cousiño ED - Bilge Gunsel ED - Anil K. Jain ED - A. Murat Tekalp ED - Bülent Sankur KW - bar-codes KW - visible-encryption JF - International Workshop on Multimedia Content Representation, Classification and Security T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg CY - Istambul, Turkey VL - 4105 ER - TY - JOUR T1 - Robustness Improvement of Known-Host-State Watermarking Using Host Statistics JF - Signal Processing Y1 - 2006 A1 - Oleksiy Koval A1 - Sviatoslav Voloshynovskiy A1 - Jose Emilio Vila-Forcén A1 - Fernando Pérez-González A1 - Frederic Deguillaume A1 - Thierry Pun KW - data-hiding KW - watermarking VL - 86 ER - TY - JOUR T1 - Second-order blind algorithms for adaptive recursive linear equalizers: Analysis and lattice implementation JF - International Journal of Adaptive Control and Signal Processing Y1 - 2006 A1 - R. López-Valcarce KW - adaptive IIR filters KW - blind equalization KW - Digital Communications KW - lattice filters VL - 20 ER - TY - CONF T1 - Secret dither estimation in lattice-quantization data hiding: a set-membership approach T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2006 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González A1 - Pedro Comesaña ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - security KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - JOUR T1 - Security of lattice-based data hiding against the Known Message Attack JF - IEEE Transactions on Information Forensics and Security Y1 - 2006 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González A1 - Teddy Furon A1 - Pedro Comesaña KW - data-hiding KW - security KW - watermarking VL - 1 ER - TY - THES T1 - Side-informed data hiding: robustness and security analysis Y1 - 2006 A1 - Pedro Comesaña KW - data-hiding KW - watermarking PB - University of Vigo, Spain ER - TY - CONF T1 - Symbol-Rate Estimation for DVB-S2 Broadcasting T2 - International Workshop on Signal Processing for Space Communications (SPSC) Y1 - 2006 A1 - C. Mosquera A1 - Sandro Scalise A1 - R. López-Valcarce KW - DVB KW - symbol rate KW - synchronization JF - International Workshop on Signal Processing for Space Communications (SPSC) ER - TY - CONF T1 - Toward a theory of multirate nonlinear systems T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2006 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - multirate systems KW - nonlinear filters KW - polyphase filters JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Cannes, France ER - TY - CONF T1 - Trellis Shaping Techniques for Satellite Telecommunication Systems T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2006 A1 - Marcos Álvarez-Díaz A1 - Neri, Massimo A1 - C. Mosquera A1 - Giovanni Emanuele Corazza KW - Digital Communications KW - precoding KW - satellite communications JF - International Workshop on Satellite and Space Communications (IWSSC) CY - Leganés, Spain ER - TY - JOUR T1 - Watermarking security: a survey JF - Transactions on Data Hiding and Multimedia Security I Y1 - 2006 A1 - Luis Pérez-Freire A1 - Pedro Comesaña A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking VL - 4300 ER - TY - CONF T1 - Zero-Knowledge watermark detector robust to sensitivity attacks T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2006 A1 - Juan Ramón Troncoso-Pastoriza A1 - Fernando Pérez-González KW - data-hiding KW - watermarking KW - zero-knowledge JF - ACM Workshop on Multimedia and Security (MMSEC) PB - ACM CY - Geneva, Switzerland ER - TY - CONF T1 - Aeronautical Channel Model for Broadband L-Band Satellite Communication T2 - AIAA International Communications Satellite Systems Conference (ICSSC) Y1 - 2005 A1 - Madhavendra Richharia A1 - Naveen Kaluvala A1 - Panos Fines A1 - Marcos Álvarez-Díaz A1 - Axel Jahn KW - Digital Communications KW - L-Band KW - satellite communications JF - AIAA International Communications Satellite Systems Conference (ICSSC) CY - Rome, Italy ER - TY - CONF T1 - Analysis of a first-order adaptive recursive predictor T2 - IEEE Conference on Decision and Control / European Control Conference (CDC/ECC) Y1 - 2005 A1 - R. López-Valcarce KW - adaptive signal processing KW - equalization KW - second-order statistics JF - IEEE Conference on Decision and Control / European Control Conference (CDC/ECC) CY - Seville, Spain ER - TY - CONF T1 - Applying Erez and Ten Brink's Dirty Paper Codes to Data-Hiding T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Frans M. J. Willems ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Detection in quantization-based watermarking: performance and security issues T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Luis Pérez-Freire A1 - Pedro Comesaña A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - security KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Diamond contour-based phase recovery for (cross-)QAM constellations T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2005 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce KW - adaptive signal processing KW - synchronization JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Bordeaux, France ER - TY - CONF T1 - Ensuring Gain Invariance in High-Rate Data-Hiding T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Mauro Barni A1 - Andrea Abrardo ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Fundamentals of data hiding security and their application to spread-spectrum analysis T2 - International Workshop on Information Hiding (IH) Y1 - 2005 A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González ED - Mauro Barni ED - Jordi Herrera-Joancomartí ED - Stefan Katzenbeisser ED - Fernando Pérez-González KW - data-hiding KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg CY - Barcelona, Spain VL - 3727 ER - TY - CONF T1 - Information-theoretic analysis of security in side-informed data hiding T2 - International Workshop on Information Hiding (IH) Y1 - 2005 A1 - Luis Pérez-Freire A1 - Pedro Comesaña A1 - Fernando Pérez-González ED - Mauro Barni ED - Jordi Herrera-Joancomartí ED - Stefan Katzenbeisser ED - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg VL - 3727 N1 - 6-8 June ER - TY - CONF T1 - An information-theoretic framework for assessing security in practical watermarking and data hiding scenarios T2 - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) Y1 - 2005 A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González KW - data-hiding KW - security KW - watermarking JF - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) CY - Montreux, Switzerland ER - TY - CONF T1 - Joint precoding and predistortion techniques for satellite telecommunication systems T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2005 KW - Digital Communications KW - precoding KW - satellite communications JF - International Workshop on Satellite and Space Communications (IWSSC) CY - Siena, Italy ER - TY - JOUR T1 - Rational Dither Modulation: a high-rate data-hiding method robust to gain attacks JF - IEEE Transactions on Signal Processing Y1 - 2005 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Mauro Barni A1 - Andrea Abrardo KW - data-hiding KW - watermarking VL - 53 N1 - Third supplement on secure media ER - TY - JOUR T1 - Realizable minimum mean-squared error channel shorteners JF - IEEE Transactions on Signal Processing Y1 - 2005 A1 - R. López-Valcarce KW - adaptive signal processing KW - Channel shortening VL - 53 ER - TY - CONF T1 - The return of the sensitivity attack T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2005 A1 - Pedro Comesaña A1 - Luis Pérez-Freire A1 - Fernando Pérez-González ED - Mauro Barni ED - Ingemar J. Cox ED - Ton Kalker ED - H. J. Kim KW - data-hiding KW - watermarking JF - International Workshop on Digital Watermarking (IWDW) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg CY - Siena, Italy VL - 3710 ER - TY - CONF T1 - On reversibility of random binning techniques: multimedia perspectives T2 - Conference on Communications and Multimedia Security (CMS) Y1 - 2005 A1 - Sviatoslav Voloshynovskiy A1 - Oleksiy Koval A1 - E. Topak A1 - Jose Emilio Vila-Forcén A1 - Pedro Comesaña A1 - Thierry Pun KW - data-hiding KW - watermarking JF - Conference on Communications and Multimedia Security (CMS) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg CY - Salzburg, Austria ER - TY - CONF T1 - Robustness Improvement of Known-Host-State Watermarking Using Host Statistics T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Oleksiy Koval A1 - Sviatoslav Voloshynovskiy A1 - Frederic Deguillaume A1 - Fernando Pérez-González A1 - Thierry Pun ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Spread-spectrum vs. quantization-based data hiding: misconceptions and implications T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Worst case additive attack against quantization-based data-hiding methods T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Jose Emilio Vila-Forcén A1 - Sviatoslav Voloshynovskiy A1 - Oleksiy Koval A1 - Fernando Pérez-González A1 - Thierry Pun ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Bias analysis and removal of a microphone array based road traffic speed estimator T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2004 A1 - R. López-Valcarce A1 - D. Hurtado A1 - C. Mosquera A1 - Fernando Pérez-González KW - microphone arrays KW - speed estimation KW - traffic monitoring JF - European Signal Processing Conference (EUSIPCO) CY - Vienna, Austria ER - TY - JOUR T1 - Blind input, initial state, and system identification of SIMO Laguerre systems JF - IEEE Transactions on Signal Processing Y1 - 2004 A1 - Jacob H. Gunther A1 - R. López-Valcarce KW - blind identification KW - blind input estimation KW - Laguerre systems KW - system identification VL - 52 ER - TY - CONF T1 - Blind iterative decoding of side-informed data hiding using the Expectation-Maximization algorithm T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2004 A1 - Félix Balado A1 - Fernando Pérez-González A1 - Pedro Comesaña ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Blind Turbo Decoding of Side-Informed Data Hiding Using Iterative Channel Estimation T2 - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) Y1 - 2004 A1 - Félix Balado A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) CY - Lisboa ER - TY - CONF T1 - Broadband analysis of a microphone array based road traffic speed estimator T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) Y1 - 2004 A1 - R. López-Valcarce KW - microphone arrays KW - speed estimation KW - traffic monitoring JF - IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) CY - Sitges, Barcelona, Spain ER - TY - JOUR T1 - Cost minimisation interpretation of fourth power phase estimator and links to multimodulus algorithm JF - IEE Electronics Letters Y1 - 2004 A1 - R. López-Valcarce KW - constant modulus KW - Digital Communications KW - equalization KW - multimodulus KW - phase estimation VL - 40 ER - TY - JOUR T1 - Estimation of road vehicle speed using two omnidirectional microphones: a maximum likelihood approach JF - EURASIP Journal of Applied Signal Processing Y1 - 2004 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-González KW - microphone arrays KW - speed estimation KW - traffic monitoring VL - 2004 ER - TY - CONF T1 - Improved Binary Dither-Modulation with perceptual constraints T2 - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) Y1 - 2004 A1 - Fernando Pérez-González A1 - Pedro Comesaña KW - data-hiding KW - watermarking JF - International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) CY - Lisboa, Portugal ER - TY - JOUR T1 - Linear Boundary Extensions for Finite Length Signals and Paraunitary Two-Channel Filter Banks JF - IEEE Transactions on Signal Processing Y1 - 2004 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic VL - 52 ER - TY - JOUR T1 - Minimum delay spread TEQ design in multicarrier systems JF - IEEE Signal Processing Letters Y1 - 2004 A1 - R. López-Valcarce KW - channel shortener KW - cyclic prefix KW - delay spread KW - Digital Communications KW - multicarrier communications KW - time domain equalizer VL - 11 ER - TY - CONF T1 - Performance of Coding and Synchronization Schemes for a DVB-S Based Air-Interface in the Railway Environment T2 - Vehicular Technology Conference (VTC) Y1 - 2004 A1 - Sandro Scalise A1 - Giorgio Sciascia A1 - Marcos Álvarez-Díaz A1 - Harald Ernst A1 - Rodolfo Mura KW - Digital Communications KW - DVB-S KW - satellite communications JF - Vehicular Technology Conference (VTC) CY - Milano, Italy VL - 1 ER - TY - CONF T1 - POLI-MAS: Power-Line Multichannel Audio System T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2004 A1 - Fernando J. Mato-Méndez A1 - C. Mosquera KW - audio KW - multichannel KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - Quantifying Security Leaks in Spread Spectrum Data Hiding: A Game Theoretic Approach T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2004 A1 - Pedro Comesaña A1 - Fernando Pérez-González ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - CONF T1 - Quantization-based watermarking performance improvement using host statistics: additive noise attack T2 - ACM Workshop on Multimedia and Security (MMSEC) Y1 - 2004 A1 - Oleksiy Koval A1 - Sviatoslav Voloshynovskiy A1 - Fernando Pérez-González A1 - Frederic Deguillaume A1 - Thierry Pun JF - ACM Workshop on Multimedia and Security (MMSEC) CY - Magdeburg, Germany ER - TY - CONF T1 - Rational Dither Modulation: a novel data-hiding method robust to value-metric attacks T2 - IEEE International Workshop on Multimedia Signal Processing Y1 - 2004 A1 - Fernando Pérez-González A1 - Mauro Barni A1 - Andrea Abrardo A1 - C. Mosquera KW - data-hiding KW - watermarking JF - IEEE International Workshop on Multimedia Signal Processing CY - Siena, Italy ER - TY - JOUR T1 - Realizable linear and decision feedback equalizers: properties and connections JF - IEEE Transactions on Signal Processing Y1 - 2004 A1 - R. López-Valcarce KW - adaptive signal processing KW - channel equalization VL - 52 N1 - Recipient of a 2005 Best Paper Award of the IEEE Signal Processing Society U1 -

Best Paper Award of the IEEE Signal Processing Society (Signal Processing for Communications), 2005

ER - TY - CONF T1 - Revealing the true achievable rates of Scalar Costa Scheme T2 - IEEE International Workshop on Multimedia Signal Processing Y1 - 2004 A1 - Luis Pérez-Freire A1 - Fernando Pérez-González A1 - Sviatoslav Voloshynovskiy KW - data-hiding KW - watermarking JF - IEEE International Workshop on Multimedia Signal Processing CY - Siena, Italy ER - TY - CONF T1 - Spread Spectrum Watermarking for Real Images: Is Everything So Hopeless? T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2004 A1 - Oleksiy Koval A1 - Sviatoslav Voloshynovskiy A1 - Fernando Pérez-González A1 - Frederic Deguillaume A1 - Thierry Pun JF - European Signal Processing Conference (EUSIPCO) CY - Vienna, Austria ER - TY - CONF T1 - Worst case additive attack against quantization-based watermarking techniques T2 - IEEE International Workshop on Multimedia Signal Processing Y1 - 2004 A1 - Jose Emilio Vila-Forcén A1 - Sviatoslav Voloshynovskiy A1 - Oleksiy Koval A1 - Thierry Pun A1 - Fernando Pérez-González JF - IEEE International Workshop on Multimedia Signal Processing CY - Siena, Italy ER - TY - JOUR T1 - An algorithm for unit-norm equation-error system identification based on the method of multipliers JF - IEEE Transactions on Signal Processing Y1 - 2003 A1 - R. López-Valcarce KW - adaptive IIR filters KW - equation error KW - system identification KW - unit-norm VL - 51 ER - TY - CONF T1 - On the applicability to correlated sources of a blind channel equalization method robust to order overestimation T2 - IFAC Symposium on System Identification Y1 - 2003 A1 - R. López-Valcarce KW - correlated sources KW - Digital Communications KW - equalization KW - order overestimation KW - second-order statistics JF - IFAC Symposium on System Identification CY - Rotterdam, the Netherlands ER - TY - CONF T1 - Blind iterative decision feedback equalizers for block QAM transmission systems T2 - Baiona Workshop on Signal Processing in Communications Y1 - 2003 A1 - R. López-Valcarce KW - blind equalization KW - decision feedback equalization KW - iterative equalization JF - Baiona Workshop on Signal Processing in Communications CY - Baiona, Pontevedra, Spain ER - TY - CONF T1 - Characterization of the Railroad Satellite Channel within the FIFTH Project T2 - IST Mobile & Wireless Communications Summit Y1 - 2003 A1 - Sandro Scalise A1 - Marcos Álvarez-Díaz A1 - Giorgio Sciascia A1 - Rodolfo Mura KW - Digital Communications KW - satellite communications JF - IST Mobile & Wireless Communications Summit CY - Aveiro, Portugal ER - TY - THES T1 - Digital image data hiding using side information Y1 - 2003 A1 - Félix Balado KW - data-hiding KW - watermarking PB - University of Vigo, Spain ER - TY - CONF T1 - Dither-Modulation Data hiding with distortion-compensation: exact performance analysis and an improved detector for JPEG attacks. T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2003 A1 - Fernando Pérez-González A1 - Pedro Comesaña A1 - Félix Balado KW - data-hiding KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Barcelona, Spain ER - TY - CONF T1 - DVB-S Air Interface over Railroad Satellite Channel: Performance and Extensions T2 - Baiona Workshop on Signal Processing in Communications Y1 - 2003 A1 - Marcos Álvarez-Díaz A1 - Sandro Scalise A1 - Giorgio Sciascia A1 - Rodolfo Mura A1 - Paolo Conforto A1 - Harald Ernst KW - Digital Communications KW - DVB-S KW - satellite communications JF - Baiona Workshop on Signal Processing in Communications CY - Baiona, Spain ER - TY - CONF T1 - Feedback Timing Synchronization for IF-Sampled Systems T2 - International Workshop on Signal Processing for Space Communications (SPSC) Y1 - 2003 A1 - C. Mosquera A1 - M. Cacheda KW - PLC JF - International Workshop on Signal Processing for Space Communications (SPSC) ER - TY - CONF T1 - Hexagonal Quantizers are not Optimal for 2-D Data Hiding T2 - Security and Watermarking of Multimedia Contents Y1 - 2003 A1 - Félix Balado A1 - Fernando Pérez-González ED - Ping W. Wong ED - Edward J. Delp KW - data-hiding KW - watermarking JF - Security and Watermarking of Multimedia Contents T3 - Proc. of SPIE CY - Santa Clara, USA VL - 5020 ER - TY - CONF T1 - The Importance of aliasing in structured quantization index modulation data hiding (invited lecture) T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2003 A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - International Workshop on Digital Watermarking (IWDW) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg VL - 2939 / 2004 ER - TY - CONF T1 - Indoor Image Acquisition and Distribution System T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2003 A1 - D. Fondo A1 - M. Cacheda A1 - C. Mosquera KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - Link Design for Satellite Based Services in the Fast Train Environment T2 - International Conference on Advanced Satellite Mobile Systems (ASMS) Y1 - 2003 A1 - Sandro Scalise A1 - Paolo Conforto A1 - Marcos Álvarez-Díaz A1 - Giorgio Sciascia A1 - Rodolfo Mura A1 - Harald Ernst KW - Digital Communications KW - satellite communications JF - International Conference on Advanced Satellite Mobile Systems (ASMS) CY - ESRIN, Frascati, Italy ER - TY - CONF T1 - Link Performance for Mobile Satellite Based Services in Ku-Band T2 - AIAA International Communications Satellite Systems Conference (ICSSC) Y1 - 2003 A1 - Giorgio Sciascia A1 - Sandro Scalise A1 - Harald Ernst A1 - Marcos Álvarez-Díaz A1 - Matthias Holzbock A1 - Rodolfo Mura KW - Digital Communications KW - satellite communications JF - AIAA International Communications Satellite Systems Conference (ICSSC) CY - Yokohama, Japan ER - TY - CONF T1 - A low complexity all-digital DS-SS transceiver for power-line communications T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2003 A1 - M. Ferreiro A1 - M. Cacheda A1 - C. Mosquera KW - DS-SS KW - modem KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - Optimal Data-Hiding Strategies for Games with BER Payoffs T2 - International Workshop on Digital Watermarking (IWDW) Y1 - 2003 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Félix Balado ED - Ton Kalker ED - Ingemar J. Cox ED - Yong Man Ro KW - data-hiding KW - watermarking JF - International Workshop on Digital Watermarking (IWDW) T3 - Lecture Notes in Computer Science PB - Springer-Verlag Heidelberg VL - 2939 / 2004 ER - TY - CONF T1 - Optimal Strategies for Spread-Spectrum and Quantized-Projection image data hiding games with BER Payoffs T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2003 A1 - Pedro Comesaña A1 - Fernando Pérez-González A1 - Félix Balado KW - data-hiding KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Barcelona, Spain ER - TY - JOUR T1 - Performance Analysis of Existing and New Methods for Data Hiding with Known-Host Information in Additive Channels JF - IEEE Transactions on Signal Processing Y1 - 2003 A1 - Fernando Pérez-González A1 - Félix Balado A1 - Juan R. Hernández KW - data-hiding KW - watermarking VL - 51 N1 - Special Issue on Signal Processing for Data Hiding in Digital Media & Secure Content Delivery ER - TY - CONF T1 - Performance of DVB-S Air-Interface over Land Mobile Satellite Channel at Ku-Band for Fast Trains T2 - International Workshop on Signal Processing for Space Communications (SPSC) Y1 - 2003 A1 - Marcos Álvarez-Díaz A1 - Sandro Scalise A1 - Giorgio Sciascia A1 - Rodolfo Mura A1 - Paolo Conforto A1 - Vincenzo Schena A1 - Harald Ernst KW - Digital Communications KW - DVB-S KW - satellite communications JF - International Workshop on Signal Processing for Space Communications (SPSC) CY - Catania, Italia ER - TY - JOUR T1 - Second order statistical properties of nonlinearly distorted PSK signals JF - IEEE Communications Letters Y1 - 2003 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels KW - PSK modulation KW - second-order statistics VL - 7 ER - TY - JOUR T1 - Subband hyperstable adaptive IIR filters JF - IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing Y1 - 2003 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - subband adaptive filters KW - system identification VL - 50 ER - TY - CONF T1 - Visible Encryption: Using Paper as a Secure Channel T2 - Security and Watermarking of Multimedia Contents Y1 - 2003 A1 - Norberto Degara-Quintela A1 - Fernando Pérez-González ED - Ping W. Wong ED - Edward J. Delp KW - 2-D-Bar-Codes KW - data-hiding KW - print-&-scan KW - Two-dimensional-modulations KW - visible-encryption JF - Security and Watermarking of Multimedia Contents T3 - Proc. of SPIE CY - Santa Clara, USA VL - 5020 ER - TY - JOUR T1 - Analysis of Pilot-Based Synchronization Algorithms for Watermarking of Still Images JF - Signal Processing: Image Communication Y1 - 2002 A1 - Manuel Alvarez-Rodríguez A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 17 ER - TY - CONF T1 - Analysis of the prewhitened constant modulus cost function T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - constant modulus KW - Digital Communications KW - equalization JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Orlando, FL, USA VL - 3 ER - TY - CONF T1 - Automatic delay selection in blind channel equalization: a prewhitening + eigenvector approach T2 - Asilomar Conference on Signals, Systems and Computers Y1 - 2002 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - Digital Communications KW - equalization KW - higher-order statistics JF - Asilomar Conference on Signals, Systems and Computers CY - Pacific Grove, CA, USA ER - TY - CONF T1 - Channel equalization with staggered modulation formats T2 - IEEE International Conference on Digital Signal Processing (DSP) Y1 - 2002 A1 - R. López-Valcarce KW - Digital Communications KW - equalization KW - staggered modulation JF - IEEE International Conference on Digital Signal Processing (DSP) CY - Santorini, Greece ER - TY - CONF T1 - Improving Data Hiding Performance by Using Quantization in a Projected Domain T2 - IEEE International Conference on Multimedia and Expo (ICME) Y1 - 2002 A1 - Fernando Pérez-González A1 - Félix Balado KW - data-hiding KW - watermarking JF - IEEE International Conference on Multimedia and Expo (ICME) CY - Lausanne, Switzerland ER - TY - CONF T1 - Nothing But a Kiss: A Novel and Accurate Approach to Assessing the Performance of Multidimensional Distortion-Compensated Dither Modulation T2 - International Workshop on Information Hiding (IH) Y1 - 2002 A1 - Fernando Pérez-González A1 - Félix Balado KW - data-hiding KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science PB - Springer-Verlag CY - Noorwijkerhout, The Netherlands ER - TY - CONF T1 - Polynomial extension method for size-limited paraunitary filter banks T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2002 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - European Signal Processing Conference (EUSIPCO) CY - Toulouse, France ER - TY - CONF T1 - Provably or Probably Robust Data Hiding? T2 - IEEE International Conference on Multimedia and Expo (ICME) Y1 - 2002 A1 - Félix Balado A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - IEEE International Conference on Multimedia and Expo (ICME) CY - Lausanne, Switzerland ER - TY - CONF T1 - Quantized Projection Data Hiding T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2002 A1 - Fernando Pérez-González A1 - Félix Balado KW - data-hiding KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) CY - Rochester (NY), USA ER - TY - CONF T1 - Road vehicle speed estimation from a two-microphone array T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - Fernando Pérez-González A1 - R. López-Valcarce A1 - C. Mosquera KW - microphone arrays KW - speed estimation KW - traffic monitoring JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Orlando, FL, USA VL - 2 ER - TY - CONF T1 - Smooth Orthogonal Signal Extensions for Paraunitary Tree-structured Filter Banks T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Orlando, USA ER - TY - CONF T1 - Spectral characterization of feedback linear periodically time-varying systems T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco KW - burst KW - inversion KW - LPTV KW - PLL JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - THES T1 - Adaptive algorithms for identification and equalization using recursive filters Y1 - 2001 A1 - R. López-Valcarce KW - adaptive signal processing PB - University of Vigo CY - Vigo, Spain VL - Ph.D. ER - TY - JOUR T1 - Adaptive IIR Filters for Active Noise Control JF - International Journal of Acoustics and Vibration Y1 - 2001 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González A1 - M. Sobreira A1 - E. Alexandre KW - ANC KW - IIR KW - SPR VL - 6 ER - TY - JOUR T1 - Adaptive lattice IIR filtering revisited: convergence issues and new algorithms with improved stability properties JF - IEEE Transactions on Signal Processing Y1 - 2001 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - lattice filters KW - system identification VL - 49 ER - TY - JOUR T1 - An adaptive tiling of the time-frequency plane with application to multiresolution-based perceptive audio coding JF - Signal Processing Y1 - 2001 A1 - Nuria González-Prelcic A1 - Antonio S. Pena VL - 81/2 ER - TY - JOUR T1 - Algebraic solution to the robust SPR problem for two polynomials JF - Automatica Y1 - 2001 A1 - C. Mosquera A1 - Fernando Pérez-González KW - robust KW - SPR VL - 37 ER - TY - JOUR T1 - Approaching the Capacity Limit in Image Watermarking: A Perspective on Coding Techniques for Data Hiding Applications JF - Signal Processing Y1 - 2001 A1 - Fernando Pérez-González A1 - Juan R. Hernández A1 - Félix Balado KW - data-hiding KW - watermarking VL - 81 N1 - Special Section on Information Theoretic Aspects of Digital Watermarking ER - TY - JOUR T1 - Blind channel equalization with colored sources based on second-order statistics: a linear prediction approach JF - IEEE Transactions on Signal Processing Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - correlated sources KW - Digital Communications KW - equalization KW - second-order statistics VL - 49 ER - TY - CONF T1 - Blind equalization of nonlinear channels from second order statistics using precoding and channel diversity T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2001 A1 - R. López-Valcarce A1 - Xuejie Song A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Salt Lake City, UT, USA VL - 4 ER - TY - JOUR T1 - Blind Equalization of Nonlinear Channels from Second-Order Statistics JF - IEEE Transactions on Signal Processing Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels KW - second-order statistics VL - 49 ER - TY - CONF T1 - Blind equalization of nonlinear digital satellite links with PSK modulation T2 - IEEE International Symposium on Circuits and Systems (ISCAS) Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels KW - second-order statistics JF - IEEE International Symposium on Circuits and Systems (ISCAS) CY - Sydney, Australia VL - 2 ER - TY - CONF T1 - On blind equalization of rank deficient nonlinear channels T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Singapore ER - TY - CONF T1 - A Channel Model for the Galician Low Voltage Main Network T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2001 A1 - Nuria González-Prelcic A1 - C. Mosquera A1 - Norberto Degara-Quintela A1 - A. Currais JF - International Symposium on Power Line Communications and Its Applications (ISPLC) CY - Malmo, Sweden ER - TY - CONF T1 - Coding at the Sample Level for Data Hiding: Turbo and Concatenated Codes T2 - Security and Watermarking of Multimedia Contents Y1 - 2001 A1 - Félix Balado A1 - Fernando Pérez-González ED - Ping W. Wong ED - Edward J. Delp KW - data-hiding KW - watermarking JF - Security and Watermarking of Multimedia Contents T3 - Proc. of SPIE CY - San José, USA VL - 4314 ER - TY - JOUR T1 - Efficient Reinitialization of the Prewhitened Constant Modulus Algorithm JF - IEEE Communications Letters Y1 - 2001 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - constant modulus KW - Digital Communications KW - equalization VL - 5 ER - TY - JOUR T1 - Equalization and interference cancellation in linear multiuser systems based on second-order statistics JF - IEEE Transactions on Signal Processing Y1 - 2001 A1 - R. López-Valcarce A1 - Zhi Ding A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - second-order statistics VL - 49 ER - TY - CONF T1 - Orthogonal Extensions of AR Processes without Artificial Discontinuities for Size-Limites Filter Banks T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2001 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Singapur ER - TY - CONF T1 - Second order statistics based blind channel equalization with correlated sources T2 - IEEE International Symposium on Circuits and Systems (ISCAS) Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - correlated sources KW - Digital Communications KW - equalization KW - second-order statistics JF - IEEE International Symposium on Circuits and Systems (ISCAS) CY - Sydney, Australia VL - 4 ER - TY - JOUR T1 - Some properties of the matrix exponential JF - IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing Y1 - 2001 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - exponential matrix KW - linear algebra VL - 48 ER - TY - JOUR T1 - On the strengthened robust SPR problem for discrete-time systems JF - Automatica Y1 - 2001 A1 - C. Mosquera A1 - Fernando Pérez-González KW - robust KW - SPR KW - strengthened VL - 37 ER - TY - CONF T1 - Time-transfer performance in burst-mode communication systems T2 - International Workshop on Digital Signal Processing Techniques for Space Communications (DSP) Y1 - 2001 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco A1 - D. Giunta KW - burst KW - PLL KW - synchronization JF - International Workshop on Digital Signal Processing Techniques for Space Communications (DSP) ER - TY - JOUR T1 - Time-transfer performance in burst-mode communication systems JF - IEEE Journal on Selected Areas in Communications Y1 - 2001 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco A1 - G. Garofalo A1 - D. Giunta KW - burst KW - PLL KW - synchronization VL - 19 ER - TY - CONF T1 - Turbo Coding for Sample-Level Watermarking in the DCT Domain T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2001 A1 - Félix Balado A1 - Fernando Pérez-González A1 - Sandro Scalise KW - data-hiding KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) CY - Thessaloniki, Greece ER - TY - JOUR T1 - Wavelet-packet-based subband adaptive equalization JF - Signal Processing Y1 - 2001 A1 - Nuria González-Prelcic A1 - Fernando Pérez-González A1 - M. Elena Domínguez-Jiménez VL - 81 ER - TY - CONF T1 - Analytical Bounds on the Error Performance of the DVB-T System in Time-Invariant Channels T2 - IEEE International Conference on Communications (ICC) Y1 - 2000 A1 - José M. Lago A1 - Fernando Pérez-González KW - Digital Communications KW - Digital Television KW - Rayleigh KW - Rice KW - Terrestrial JF - IEEE International Conference on Communications (ICC) CY - New Orleans, LA, USA ER - TY - JOUR T1 - ArboX, a Contribution to Digital Library JF - Computer Applications in Engineering Education Y1 - 2000 A1 - O.W. Márquez A1 - Félix Balado A1 - M. Vázquez A1 - D. Docampo VL - 8 ER - TY - CONF T1 - On blind adaptive algorithms for IIR equalizers T2 - IEEE Digital Signal Processing Workshop (DSP) Y1 - 2000 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - Digital Communications KW - equalization KW - second-order statistics JF - IEEE Digital Signal Processing Workshop (DSP) CY - Hunt, TX, USA ER - TY - CONF T1 - Blind channel identifiability/equalizability of single input multiple output nonlinear channels from second order statistics T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2000 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels KW - second-order statistics JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Istanbul, Turkey VL - 5 ER - TY - THES T1 - Blind equalization of linear and nonlinear digital communication channels from second-order statistics Y1 - 2000 A1 - R. López-Valcarce KW - adaptive signal processing KW - channel equalization PB - University of Iowa CY - Iowa City, USA VL - Ph.D. ER - TY - JOUR T1 - Convergence analysis of the multiple-channel filtered-U recursive LMS algorithm for active noise control JF - Signal Processing Y1 - 2000 A1 - C. Mosquera A1 - Fernando Pérez-González KW - ANC KW - FuRLMS KW - SPR VL - 80 ER - TY - JOUR T1 - DCT-Domain Watermarking Techniques for Still Images: Detector Performance Analysis and a New Structure JF - IEEE Transactions on Image Processing Y1 - 2000 A1 - Juan R. Hernández A1 - Martín Amado A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 9 N1 - Special Issue on Image and Video Processing for Digital Libraries ER - TY - CONF T1 - Design of non-expansionist and orthogonal extension methods for tree-structured filter banks T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2000 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Estambul, Turkey ER - TY - JOUR T1 - Exponential asymptotic stability of time-varying inverse prediction error filters JF - IEEE Transactions on Signal Processing Y1 - 2000 A1 - R. López-Valcarce A1 - Soura Dasgupta A1 - Roberto Tempo A1 - Minyue Fu KW - nonstationary processes KW - prediction error filters KW - stability VL - 48 ER - TY - JOUR T1 - Improving the Performance of Spatial Watermarking of Images Using Channel Coding JF - Signal Processing Y1 - 2000 A1 - Juan R. Hernández A1 - José M. Rodríguez A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 80 ER - TY - CONF T1 - Interference cancellation and blind equalization for linear multi-user systems T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2000 A1 - Zhi Ding A1 - Soura Dasgupta A1 - R. López-Valcarce KW - Digital Communications KW - equalization KW - second-order statistics JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Istanbul, Turkey VL - 1 ER - TY - CONF T1 - Misconvergence and stabilization of adaptive IIR lattice filters T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2000 A1 - Fernando Pérez-González A1 - R. López-Valcarce KW - adaptive IIR filters KW - lattice filters KW - system identification JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Istanbul, Turkey VL - 1 ER - TY - CONF T1 - New Orthogonal Extension Methods for Tree-Structured Filter Banks T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2000 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - European Signal Processing Conference (EUSIPCO) CY - Tampere, Finland ER - TY - CONF T1 - The role of second-order statistics in blind equalization of nonlinear channels T2 - IEEE Workshop on Statistical Signal Processing (SSP) Y1 - 2000 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - Digital Communications KW - equalization KW - nonlinear channels KW - second-order statistics JF - IEEE Workshop on Statistical Signal Processing (SSP) CY - Pocono Manor, PA, USA ER - TY - CONF T1 - ArboX, a Contribution to Digital Library T2 - International Conference on Engineering and Computer Education (ICECE) Y1 - 1999 A1 - O.W. Márquez A1 - Félix Balado A1 - M. Vázquez A1 - D. Docampo JF - International Conference on Engineering and Computer Education (ICECE) PB - IEEE Education Society CY - Rio de Janeiro, Brazil ER - TY - CONF T1 - BER Performance of the DVB-T System in Time-Invariant Channels T2 - Baiona Workshop on Emerging Technologies in Communications Y1 - 1999 A1 - José M. Lago A1 - Fernando Pérez-González KW - Digital Communications KW - Digital Television KW - Rayleigh KW - Rice KW - Terrestrial JF - Baiona Workshop on Emerging Technologies in Communications CY - Baiona-Vigo, Spain ER - TY - JOUR T1 - Hyperstable adaptive IIR algorithms with polyphase structures: analysis and design JF - IEEE Transactions on Signal Processing Y1 - 1999 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-González KW - adaptive IIR filters KW - system identification VL - 47 ER - TY - CONF T1 - Hyperstable polyphase adaptive IIR filters T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1999 A1 - C. Mosquera A1 - Fernando Pérez-González A1 - R. López-Valcarce KW - adaptive IIR filters KW - system identification JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Phoenix, AZ, USA VL - 4 ER - TY - CONF T1 - IIR adaptive filters for active noise control T2 - International Congress on Sound and Vibration Y1 - 1999 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González A1 - M. Sobreira KW - ANC KW - IIR KW - SPR JF - International Congress on Sound and Vibration CY - Copenhagen, Denmark ER - TY - JOUR T1 - A new proof for the stability of equation-error models JF - IEEE Signal Processing Letters Y1 - 1999 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - adaptive IIR filters KW - system identification VL - 6 ER - TY - CONF T1 - Novel Detector Structures for Watermark Extraction in the DCT Domain T2 - Workshop on Nonlinear Signal and Image Processing Y1 - 1999 A1 - Juan R. Hernández A1 - Martín Amado A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - Workshop on Nonlinear Signal and Image Processing PB - IEEE-EURASIP CY - Antalya, Turkey ER - TY - CONF T1 - Processing Finite Length Signals via Filter Banks without Border Distortions: A Non-Expansionist Solution T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1999 A1 - M. Elena Domínguez-Jiménez A1 - Nuria González-Prelcic JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Phoenix, USA ER - TY - JOUR T1 - The robust SPR problem: design algorithms and new applications JF - Signal Processing Y1 - 1999 A1 - C. Mosquera A1 - L. Leyra A1 - Fernando Pérez-González KW - robust KW - SPR VL - 76 ER - TY - JOUR T1 - Some remarks on the lattice form of the Steiglitz-McBride iteration JF - IEEE Signal Processing Letters Y1 - 1999 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - lattice filters KW - system identification VL - 6 ER - TY - CONF T1 - On the stability of the inverse time-varying prediction error filter obtained with the RWLS algorithm T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1999 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - nonstationary processes KW - prediction error filters KW - stability JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Phoenix, AZ, USA VL - 3 ER - TY - CHAP T1 - Stable estimates in equation-error identification: an open problem T2 - Open Problems in Mathematical Systems and Control Theory Y1 - 1999 A1 - R. López-Valcarce A1 - S. Dasgupta JF - Open Problems in Mathematical Systems and Control Theory PB - Springer-Verlag SN - 1-85233-044-9 UR - http://perso.uclouvain.be/vincent.blondel/books/openprobs/ ER - TY - JOUR T1 - Statistical Analysis of Watermarking Schemes for Copyright Protection of Images JF - Proc. of the IEEE Y1 - 1999 A1 - Juan R. Hernández A1 - Fernando Pérez-González KW - data-hiding KW - watermarking VL - 87 N1 - Special Issue on Identification and Protection of Multimedia Information ER - TY - CONF T1 - A Tutorial on Digital Watermarking T2 - IEEE Annual Carnahan Conference on Security Technology Y1 - 1999 A1 - Fernando Pérez-González A1 - Juan R. Hernández KW - data-hiding KW - watermarking JF - IEEE Annual Carnahan Conference on Security Technology CY - Madrid, Spain ER - TY - CONF T1 - A Two-Stage Codebook Building Method Using Fast WAN T2 - International Conference on Image Analysis and Processing (ICIAP) Y1 - 1999 A1 - Félix Balado A1 - O.W. Márquez JF - International Conference on Image Analysis and Processing (ICIAP) PB - IEEE Computer Society CY - Venice, Italy ER - TY - CONF T1 - Wavelet Packet based subband adaptive equalization T2 - Baiona Workshop on Emerging Technologies in Telecommunications Y1 - 1999 A1 - Nuria González-Prelcic A1 - Fernando Pérez-González A1 - M. Elena Domínguez-Jiménez JF - Baiona Workshop on Emerging Technologies in Telecommunications CY - Baiona, Spain ER - TY - JOUR T1 - An adaptive recursive filter for autoregressive inputs JF - International Journal of Adaptive Control and Signal Processing Y1 - 1998 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - lattice filters KW - system identification VL - 12 ER - TY - CONF T1 - An approach to the robust SPR problem through interpolation and avoidance: connections with the robust stability problem T2 - American Control Conference Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González KW - avoidance KW - interpolation KW - robust KW - SPR JF - American Control Conference ER - TY - JOUR T1 - On the bias of the modified output error algorithm JF - IEEE Transactions on Automatic Control Y1 - 1998 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - system identification VL - 43 ER - TY - CONF T1 - Coding and Synchronization: A Boost and a Bottleneck for the Development of Image Watermarking T2 - COST #254 Int. Workshop on Intelligent Communications Y1 - 1998 A1 - Juan R. Hernández A1 - Fernando Pérez-González A1 - José M. Rodríguez KW - data-hiding KW - watermarking JF - COST #254 Int. Workshop on Intelligent Communications PB - SSGRR CY - L'Aquila, Italy ER - TY - CONF T1 - Filtered error adaptive IIR algorithms and their application to active noise control T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1998 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González KW - adaptive KW - IIR KW - SPR JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - CONF T1 - A Flexible Structure for Wavelet Packet-based Subband Adaptive Equalization T2 - IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Y1 - 1998 A1 - Nuria González-Prelcic A1 - Fernando Pérez-González A1 - A.B. Mosquera-González JF - IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis CY - Pittsburgh, USA ER - TY - CONF T1 - The Impact of Channel Coding on the Performance of Spatial Watermarking for Copyright Protection T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1998 A1 - Juan R. Hernández A1 - Fernando Pérez-González A1 - José M. Rodríguez KW - data-hiding KW - watermarking JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Seattle, Washington, USA VL - 5 ER - TY - CONF T1 - Improving DCT-Domain Watermark Extraction Using Generalized Gaussian Models T2 - COST #254 Int. Workshop on Intelligent Communications and Multimedia Terminals Y1 - 1998 A1 - Juan R. Hernández A1 - Fernando Pérez-González A1 - Martín Amado KW - data-hiding KW - watermarking JF - COST #254 Int. Workshop on Intelligent Communications and Multimedia Terminals CY - Ljubljana, Slovenia ER - TY - JOUR T1 - Performance Analysis of a 2D-Multipulse Amplitude Modulation Scheme for Data Hiding and Watermarking of Still Images JF - IEEE Journal on Selected Areas in Communications Y1 - 1998 A1 - Juan R. Hernández A1 - Fernando Pérez-González A1 - José M. Rodríguez A1 - Gustavo Nieto KW - data-hiding KW - watermarking VL - 16 ER - TY - THES T1 - Relaxation of the SPR condition with applications to the convergence of adaptive recursive algorithms Y1 - 1998 A1 - C. Mosquera PB - University of Vigo, Spain ER - TY - CHAP T1 - The Simultaneous Strict Positive Real Problem: Similarities with the Simultaneous Stability Problem and Applications in Adaptive Recursive Algorithms T2 - Mathematics in Signal Processing Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González ED - J.G. McWhirter ED - I.K. Proudler KW - robust KW - SPR JF - Mathematics in Signal Processing PB - Oxford University Press ER - TY - CONF T1 - Stability conditions for the time-varying linear predictor T2 - IEEE Conference on Decision and Control (CDC) Y1 - 1998 A1 - R. López-Valcarce A1 - Soura Dasgupta A1 - Minyue Fu A1 - Roberto Tempo KW - nonstationary processes KW - prediction error filters KW - stability JF - IEEE Conference on Decision and Control (CDC) CY - Tampa, FL, USA ER - TY - JOUR T1 - On the stability of equation-error estimates of all-pole systems JF - IEEE Signal Processing Letters Y1 - 1998 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - adaptive IIR filters KW - system identification VL - 5 ER - TY - CONF T1 - On the strengthened robust SPR problem for discrete-time systems T2 - American Control Conference Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González JF - American Control Conference ER - TY - CONF T1 - Testing a Flexible Time-Frequency Mapping for High Frequencies in TARCO (Tonal Adaptive Resolution COdec) T2 - Audio Engineering Society Convention (AES Convention) Y1 - 1998 A1 - Alejandro Casal A1 - Carlos Serantes A1 - Nuria González-Prelcic A1 - Antonio S. Pena JF - Audio Engineering Society Convention (AES Convention) CY - Amsterdam, The Netherlands N1 - Preprint 4676 (P9-6) ER - TY - CONF T1 - Throwing More Light on Image Watermarks T2 - International Workshop on Information Hiding (IH) Y1 - 1998 A1 - Juan R. Hernández A1 - Fernando Pérez-González KW - data-hiding KW - watermarking JF - International Workshop on Information Hiding (IH) T3 - Lecture Notes in Computer Science PB - Springer-Verlag CY - Portland, Oregon, USA VL - 1525 ER - TY - JOUR T1 - An Algorithm for Interpolation with Positive Rational Functions on the Imaginary Axis JF - Automatica Y1 - 1997 A1 - C. Mosquera A1 - Fernando Pérez-González KW - interpolation KW - SPR VL - 33 ER - TY - CHAP T1 - Analysis and Synthesis Tools for Robust SPRness T2 - Intelligent methods in signal processing and communications Y1 - 1997 A1 - C. Mosquera A1 - Juan R. Hernández A1 - Fernando Pérez-González ED - A. Figueiras ED - D. Docampo ED - Fernando Pérez-González KW - robust KW - SPR JF - Intelligent methods in signal processing and communications PB - Birkhauser ER - TY - CONF T1 - Data Hiding for Copyright Protection of Still Images T2 - Emerging Techniques for Communication Terminals Y1 - 1997 A1 - Juan R. Hernández A1 - Fernando Pérez-González A1 - José M. Rodríguez KW - data-hiding KW - watermarking JF - Emerging Techniques for Communication Terminals PB - ENSEEIHT CY - Tolouse, France ER - TY - CONF T1 - A Fast Noise-Scaling Algorithm for Uniform Quantization in Audio Coding Schemes T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1997 A1 - Carlos Serantes A1 - Antonio S. Pena A1 - Nuria González-Prelcic JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Munich, Germany ER - TY - CONF T1 - A Flexible Tiling of the Time Axis for Adaptive Wavelet Packet Audio Decompositions T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1997 A1 - Nuria González-Prelcic A1 - Antonio S. Pena A1 - Carlos Serantes JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Munich, Germany ER - TY - CONF T1 - New Improvements in ARCO T2 - Audio Engineering Society Convention (AES Convention) Y1 - 1997 A1 - Antonio S. Pena A1 - Nuria González-Prelcic A1 - Carlos Serantes JF - Audio Engineering Society Convention (AES Convention) CY - Munich, Germany N1 - Preprint 4419 (C-6) ER - TY - JOUR T1 - New results and theoretical analysis of the Master-Slave family of recursive identification algorithms JF - Signal Processing Y1 - 1997 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - lattice filters KW - system identification VL - 58 ER - TY - CONF T1 - Stable estimates in equation error identification T2 - IEEE Conference on Decision and Control (CDC) Y1 - 1997 A1 - R. López-Valcarce A1 - Soura Dasgupta KW - adaptive IIR filters KW - system identification JF - IEEE Conference on Decision and Control (CDC) CY - San Diego, CA, USA VL - 2 ER - TY - CONF T1 - An Adaptive Tree Search Algorithm with Application to Multiresolution-based Perceptive Audio Coding T2 - IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Y1 - 1996 A1 - Nuria González-Prelcic A1 - Antonio S. Pena JF - IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis CY - Paris, France ER - TY - CONF T1 - ARCO (Adaptive Resolution COdec): A Hybrid Approach to Perceptual Audio Coding T2 - Audio Engineering Society Convention (AES Convention) Y1 - 1996 A1 - Antonio S. Pena A1 - Carlos Serantes A1 - Nuria González-Prelcic JF - Audio Engineering Society Convention (AES Convention) CY - Copenhagen, Denmark N1 - Preprint 4178 ER - TY - CONF T1 - Characterization and Algebraic Solution to the Extreme-Point Robust SPR Problem T2 - IFAC World Congress Y1 - 1996 A1 - Fernando Pérez-González A1 - C. Mosquera KW - robust KW - SPR JF - IFAC World Congress CY - San Francisco, CA, USA ER - TY - JOUR T1 - A comparison of system architectures for intelligent document understanding JF - Signal Processing: Image Communication Y1 - 1996 A1 - G. S. D. Farrow A1 - C. S. Xydeas A1 - J.P. Oakley A1 - A. Khorabi A1 - Nuria González-Prelcic VL - 9 ER - TY - CONF T1 - Considerations on the Performance of Filter Design Methods for Wavelet Packet Audio Decompositions T2 - Audio Engineering Society Convention (AES Convention) Y1 - 1996 A1 - Nuria González-Prelcic A1 - S. González-Sánchez A1 - Antonio S. Pena JF - Audio Engineering Society Convention (AES Convention) CY - Copenhagen, Denmark N1 - Preprint 4235 ER - TY - CONF T1 - An Interactive Software for a Hypertext Course in Wavelets T2 - IEEE Digital Signal Processing Workshop (DSP) Y1 - 1996 A1 - O.W. Márquez A1 - Nuria González-Prelcic JF - IEEE Digital Signal Processing Workshop (DSP) CY - Loen, Norway ER - TY - CONF T1 - The Master-Slave family of system identification algorithms: theoretical results and new structures T2 - IFAC World Congress Y1 - 1996 A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - lattice filters KW - system identification JF - IFAC World Congress PB - IFAC CY - San Francisco, CA, USA VL - J ER - TY - JOUR T1 - A multipulse-like wavelet-based speech coder JF - Applied Signal Processing Y1 - 1996 A1 - Nuria González-Prelcic A1 - D. Docampo VL - 3 ER - TY - CONF T1 - Uvi_Wave, the Ultimate Toolbox for Wavelet Transforms and Filter Banks T2 - Baiona Workshop on Intelligent Methods in Signal Processing and Communication Y1 - 1996 A1 - Nuria González-Prelcic A1 - O.W. Márquez JF - Baiona Workshop on Intelligent Methods in Signal Processing and Communication CY - Baiona, Spain ER - TY - CONF T1 - Algebraic LTI Filter Synthesis for Simultaneously Making a Convex Combination of Discrete-Time Plants SPR T2 - IEEE Conference on Decision and Control (CDC) Y1 - 1995 A1 - Fernando Pérez-González A1 - C. Mosquera KW - robust KW - SPR JF - IEEE Conference on Decision and Control (CDC) CY - New Orleans, LA ER - TY - CONF T1 - A Multipulse-like Wavelet-based Speech Coder T2 - UK Symposium on Applications of Time-Frequency and Time-Scale Methods (TFTS) Y1 - 1995 A1 - Nuria González-Prelcic A1 - D. Docampo JF - UK Symposium on Applications of Time-Frequency and Time-Scale Methods (TFTS) CY - Warwick, UK ER - TY - CONF T1 - Application of singularity detection with wavelets for pitch estimation of speech signals T2 - European Signal Processing Conference (EUSIPCO) Y1 - 1994 A1 - Nuria González-Prelcic A1 - D. Docampo JF - European Signal Processing Conference (EUSIPCO) CY - Edimburgh, UK ER -