%0 Journal Article %J IEEE Transactions on Communications %D 2024 %T Sidelobe Suppression for Multicarrier Signals via Structured Spectral Precoding %A Khawar Hussain %A R. López-Valcarce %A Francesc Rey %A Josep Sala %A Javier Villares %K mayte %K multicarrier communications %K OFDM %K spectrum shaping %X
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.
%B IEEE Transactions on Communications %8 accepted %G eng %R 10.1109/TCOMM.2024.3357429 %0 Journal Article %J Signal Processing: Image Communication %D 2023 %T Source camera attribution via PRNU emphasis: Towards a generalized multiplicative model %A Fernández-Menduiña, Samuel %A Fernando Pérez-González %A Miguel Masciopinto %B Signal Processing: Image Communication %V 114 %G eng %U https://www.sciencedirect.com/science/article/pii/S0923596523000267 %R https://doi.org/10.1016/j.image.2023.116944 %0 Thesis %D 2023 %T Spectrum Shaping Techniques for Advanced Multicarrier Communication Systems %A Khawar Hussain %X
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.

 

%I Universidade de Vigo %C Vigo %V PhD %8 06/2023 %G eng %0 Conference Paper %B European Interdisciplinary Cybersecurity Conference (EICC) %D 2022 %T Secure Collaborative Camera Attribution %A Alberto Pedrouzo-Ulloa %A Fernando Pérez-González %A David Vázquez-Padín %B European Interdisciplinary Cybersecurity Conference (EICC) %I ACM %C Barcelona, Spain %P 97-98 %@ 978-1-4503-9603-5 %G eng %R https://doi.org/10.1145/3528580.3532993 %0 Journal Article %J IEEE Journal on Selected Areas in Information Theory %D 2022 %T The SIMO Block Rayleigh Fading Channel Capacity Scaling With Number of Antennas, Bandwidth, and Coherence Length %A Gomez-Cuba, Felipe %B IEEE Journal on Selected Areas in Information Theory %V 3 %P 54–68 %G eng %R 10.1109/JSAIT.2022.3157519 %0 Journal Article %J IEEE Transactions on Communications %D 2021 %T Space-Time Rate Splitting for the MISO BC with Magnitude CSIT %A Carlos Mosquera %A Nele Noels %A Tomás Ramírez %A Màrius Caus %A Adriano Pastore %B IEEE Transactions on Communications %G eng %0 Conference Paper %B 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) %D 2020 %T Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals %A Tomás Ramírez %A Carlos Mosquera %A Nele Noels %A Màrius Caus %A Joan Bas %A Luis Blanco %A Nader Alagha %B 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) %G eng %0 Thesis %D 2020 %T Synthesis of multiaxis stationary non-Gaussian shaped vibration %A Damián González %K multiaxial vibration %K random vibration %K vibration synthesis %X
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.
%I University of Vigo %C Vigo %G eng %0 Conference Proceedings %B 2nd XoveTIC Conference %D 2019 %T Solving self-interference issues in a Full-Duplex radio transceiver %A Miguel Franco-Martinez %A Francisco-Javier Martinez-Alonso %A R. López-Valcarce %K adaptive signal processing %K full-duplex %K winter %X
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.
%B 2nd XoveTIC Conference %C A Coruña (Spain) %8 09/2019 %G eng %R 10.3390/proceedings2019021035 %0 Conference Paper %B 2nd XoveTIC Conference %D 2019 %T Spatial Modulation for Beyond 5G Communications: Capacity Calculation and Link Adaptation %A Anxo Tato %A Carlos Mosquera %K 5G %K adaptive coding and modulation %K Deep Learning %K link adaptation %K Machine Learning %K neural networks %K Spatial Modulation %B 2nd XoveTIC Conference %C A Coruña (Spain) %G eng %0 Conference Paper %B 2019 53rd Asilomar Conference on Signals, Systems, and Computers %D 2019 %T Spatial Modulation Link Adaptation: a Deep Learning Approach %A Anxo Tato %A Carlos Mosquera %B 2019 53rd Asilomar Conference on Signals, Systems, and Computers %C California %G eng %0 Thesis %D 2019 %T A Statistical Approach to the Design of Privacy-Preserving Services %A Simon Oya %G eng %0 Conference Proceedings %B XoveTIC Congress %D 2018 %T Software Defined Radio: A Brief Introduction %A Anxo Tato %X

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.

%B XoveTIC Congress %I MDPI %C A Coruña, Spain %8 09/2018 %G eng %U https://www.mdpi.com/2504-3900/2/18/1196 %R https://doi.org/10.3390/proceedings2181196 %0 Conference Paper %B Int. Conf. on Noise and Vibration Engineering, ISMA-USD 2018 %D 2018 %T Spectral and statistical evaluation of the properties of the vibration measured at the base of an automotive seat for non-Gaussian random noise synthesis %A Damián González %A R. López-Valcarce %K random vibration %X
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.
%B Int. Conf. on Noise and Vibration Engineering, ISMA-USD 2018 %C Leuven, Belgium %8 09/2018 %G eng %0 Conference Paper %B 6th IEEE Global Conference on Signal and Information Processing %D 2018 %T Symbol-Asynchronous Transmission In Multibeam Satellite User Down-Link: Rate Regions For Novel Superposition Coding Schemes %A Nele Noels %A Marc Moeneclaey %A Tomás Ramírez %A Carlos Mosquera %A Màrius Caus %A Adriano Pastore %X

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.

%B 6th IEEE Global Conference on Signal and Information Processing %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2017 %T Secure Genomic Susceptibility Testing based on Lattice Encryption %A Juan Ramón Troncoso-Pastoriza %A Alberto Pedrouzo-Ulloa %A Fernando Pérez-González %K adversarial signal processing %K compass %K Genomic Privacy %K homomorphic encryption %K Lattice-Based Cryptography %K Privacy Protection %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %I IEEE %C New Orleans, USA %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2017 %T Smart Detection of Line-Search Oracle Attacks %A Tondi, Benedetta %A Pedro Comesaña %A Fernando Pérez-González %A Barni, Mauro %B IEEE Transactions on Information Forensics and Security %V 12 %P 588-603 %8 03/2017 %G eng %N 3 %& 588 %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2017 %T Statistical detection of JPEG traces in digital images in uncompressed formats %A Cecilia Pasquini %A Giulia Boato %A Fernando Pérez-González %B IEEE Transactions on Information Forensics and Security %V 12 %G eng %N Pending %0 Journal Article %J Microwave Journal %D 2016 %T Security in automotive radar and vehicular networks %A E. R. Yeh %A J. Choi %A Nuria González-Prelcic %A C. Bhat %A R. W. Heath Jr. %K compass %K mmWave %B Microwave Journal %G eng %0 Conference Paper %B IEEE Int. Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2015 %T Spectrum Cartography using quantized observations %A Daniel Romero %A Seung-Jun Kim %A R. López-Valcarce %A Georgios Giannakis %K cognitive radio %K compass %K compressed sensing %K spectrum sensing %X
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.
%B IEEE Int. Conference on Acoustics, Speech and Signal Processing (ICASSP) %I IEEE %C Brisbane, Australia %8 04/2015 %G eng %0 Conference Paper %B IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %D 2015 %T Subspace-constrained SINR optimization in MIMO full-duplex relays under limited dynamic range %A Emilio Antonio-Rodríguez %A R. López-Valcarce %A Taneli Riihonen %A Stefan Werner %A Risto Wichman %K adaptive signal processing %K compass %K full duplex %X
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.
%B IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %I IEEE %C Stockholm, Sweden %8 06/2015 %G eng %0 Conference Paper %B EUSIPCO %D 2015 %T An SVD Approach to Forensic Image Resampling Detection %A David Vázquez-Padín %A Pedro Comesaña %A Fernando Pérez-González %K compass %K digital image forensics %K resampling detection %K SVD %K tampering detection %X
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.
%B EUSIPCO %P 2112-2116 %8 09/2015 %G eng %0 Conference Paper %B IEEE International Symposium on Information Theory (ISIT) %D 2014 %T Scaling laws for infrastructure single and multihop wireless networks in wideband regimes %A Gomez-Cuba, Felipe %A Rangan, Sundeep %A Erkip, Elza %X

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.

%B IEEE International Symposium on Information Theory (ISIT) %C Honolulu %P 76–80 %G eng %0 Conference Paper %B IEEE International New Circuits and Systems Conference (NEWCAS) %D 2014 %T Sensitivity of compressive sensing architectures based on time interleaved analog-to-digital converters to channel mismatches %A Roi Méndez-Rial %A J.M. Caurel-Carrera %A Nuria González-Prelcic %K dynacs %B IEEE International New Circuits and Systems Conference (NEWCAS) %G eng %R 10.1109/NEWCAS.2014.6933981 %0 Conference Paper %B IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) %D 2014 %T SINR Optimization in Wideband Full-Duplex MIMO Relays under Limited Dynamic Range %A Emilio Antonio-Rodríguez %A R. López-Valcarce %A Taneli Riihonen %A Stefan Werner %A Risto Wichman %K adaptive signal processing %K compass %K full duplex %B IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) %C A Coruña, Spain %G eng %R 10.1109/SAM.2014.6882369 %0 Journal Article %J IEEE Trans. on Vehicular Technology %D 2014 %T Spectrum Sensing for Wireless Microphone Signals using Multiple Antennas %A Daniel Romero %A R. López-Valcarce %K cognitive radio %K dynacs %X 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. %B IEEE Trans. on Vehicular Technology %V 63 %P 4395-4407 %8 11/2014 %G eng %N 9 %& 4395 %R 10.1109/TVT.2014.2316513 %0 Journal Article %J IEEE Signal Processing Magazine %D 2013 %T Secure Signal Processing in the Cloud: enabling technologies for privacy-preserving multimedia cloud processing %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K SPED %B IEEE Signal Processing Magazine %V 30 %P 29-41 %8 03/2013 %G eng %N 2 %0 Conference Paper %B IEEE International Workshop on Information Forensics and Security (WIFS) %D 2013 %T Set-Membership Identification of Resampled Signals %A David Vázquez-Padín %A Pedro Comesaña %A Fernando Pérez-González %X

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.

 
%B IEEE International Workshop on Information Forensics and Security (WIFS) %C Guangzhou, China %G eng %0 Journal Article %J IEEE Transactions on Smart Grid %D 2013 %T Smart Grid Last-Mile Communications Model and Its Application to the Study of Leased Broadband Wired-Access %A Gomez-Cuba, Felipe %A Asorey-Cacheda, Rafael %A González-Castaño, Francisco Javier %X

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.

%B IEEE Transactions on Smart Grid %V 4 %P 5–12 %8 mar %G eng %0 Conference Paper %B IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt (Germany) %D 2013 %T Spectrum Sensing in Time-Varying Channels Using Multiple Antennas %A Daniel Romero %A R. López-Valcarce %K cognitive radio %K dynacs %K spectrum sensing %B IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt (Germany) %8 06/2013 %G eng %R 10.1109/SPAWC.2013.6612027 %0 Conference Paper %B Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) %D 2013 %T Statistical Cross Layer Adaptation in Fast Fading Mobile Satellite Channels %A Alberto Rico-Alvariño %A J. Arnau %A C. Mosquera %K dynacs %K fast fading channels %K link adaptation %K mobile satellite %K satcom %X

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.

%B Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) %C Atlanta, USA %G eng %R 10.1109/GLOCOM.2013.6831502 %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2011 %T Secure Adaptive Filtering %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K adaptive signal processing %K computational complexity %K cryptography %K digital data protection %K encrypted domain %K homomorphic encryption systems %K least mean squares algorithm %K least mean squares methods %K privacy %K secure adaptive filtering %K security %K signal privacy preservation %K SPED techniques %K watermarking %B IEEE Transactions on Information Forensics and Security %V 6 %P 469 -485 %8 June %G eng %R 10.1109/TIFS.2011.2109385 %0 Conference Paper %B the 3-th IEEE World Congress on Nature and Biologically Inspired Computing (NaBIC 2011) %D 2011 %T Solving the Node Localization Problem in WSNs by a Two-objective Evolutionary Algorithm and Gradient Descent %A Massimo Vecchio %A R. López-Valcarce %A Francesco Marcelloni %B the 3-th IEEE World Congress on Nature and Biologically Inspired Computing (NaBIC 2011) %G eng %0 Journal Article %J IEEE Trans. on Signal Processing %D 2011 %T Spectrum Sensing Exploiting Guard Bands and Weak Channels %A Gonzalo Vázquez-Vilar %A R. López-Valcarce %K cognitive radio %K dynacs %K spectrum sensing %X
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.
%B IEEE Trans. on Signal Processing %V 59 %P 6045-6057 %8 12/2011 %G eng %N 12 %R 10.1109/TSP.2011.2167615 %0 Conference Paper %B IEEE International Conference on Intelligent Systems Design and Applications (ISDA) %D 2011 %T A study on the Application of Different Two-objective Evolutionary Algorithms to the Node Localization Problem in Wireless Sensor Networks %A Massimo Vecchio %A R. López-Valcarce %A Francesco Marcelloni %B IEEE International Conference on Intelligent Systems Design and Applications (ISDA) %G eng %0 Conference Paper %B Virtual Physiological Human (VPH) %D 2010 %T Secure and Private Medical Clouds using Encrypted Processing %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K cloud %K privacy %K security %K watermarking %B Virtual Physiological Human (VPH) %C Brussels, Belgium %8 October %G eng %0 Journal Article %J IEEE Transactions on Signal Processing %D 2010 %T SNR Estimation for Multilevel Constellations Using Higher-Order Moments %A Marcos Álvarez-Díaz %A R. López-Valcarce %A C. Mosquera %K Blind estimation %K higher-order statistics %K Moments-based estimation %K SNR estimation %B IEEE Transactions on Signal Processing %V 58 %P 1515–1526 %8 March %G eng %0 Journal Article %J IEEE Signal Processing Letters %D 2010 %T Stepsize Sequence Design for Distributed Average Consensus %A C. Mosquera %A R. López-Valcarce %A Sudhaman K. Jayaweera %B IEEE Signal Processing Letters %V 17 %P 169-172 %8 Feb %G eng %0 Conference Paper %B Signal Processing in the Encrypted Domain (SPEED) Workshop %D 2009 %T Secure Direct and Iterative Protocols for Solving Systems of Linear Equations %A Juan Ramón Troncoso-Pastoriza %A Pedro Comesaña %A Fernando Pérez-González %K iterative protocol %K privacy %K security %K systems of linear equations %K watermarking %B Signal Processing in the Encrypted Domain (SPEED) Workshop %C Lausanne, Switzerland %P 122–141 %8 September %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2009 %T Skewed Log-Stable model for natural images pixel block-variance %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K Doubly stochastic model %K Image block-variance %K Log-stable distribution %K Lognormal distribution %K watermarking %B IEEE International Conference on Image Processing (ICIP) %I IEEE %C Cairo, Egypt %8 November %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2009 %T Spread spectrum watermarking security %A Luis Pérez-Freire %A Fernando Pérez-González %K data-hiding %K security %K watermarking %B IEEE Transactions on Information Forensics and Security %V 4 %P 2-24 %8 March %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2008 %T Security of lattice-based data hiding against the Watermarked Only Attack %A Luis Pérez-Freire %A Fernando Pérez-González %K data-hiding %K security %K watermarking %B IEEE Transactions on Information Forensics and Security %V 3 %P 593-610 %8 December %G eng %0 Conference Paper %B Advanced Satellite Mobile Systems Conference %D 2008 %T SNR Estimation with Heterogeneous Frames %A Marcos Álvarez-Díaz %A R. López-Valcarce %A C. Mosquera %B Advanced Satellite Mobile Systems Conference %C Bologna, Italy %8 August 26-28 %G eng %0 Conference Paper %B International Workshop on Satellite and Space Communications (IWSSC) %D 2007 %T Satellite Communications: Research Trends and Open Issues %A Alessandro Vanelli-Coralli %A Giovanni Emanuele Corazza %A G.K. Karagiannidis %A P.T. Mathiopoulos %A D.S. Michalopoulos %A C. Mosquera %A S. Papaharalabos %A Sandro Scalise %K satellite communications %B International Workshop on Satellite and Space Communications (IWSSC) %G eng %0 Conference Paper %B ACM Workshop on Multimedia and Security (MMSEC) %D 2007 %T A Secure Multidimensional Point Inclusion Protocol %A Juan Ramón Troncoso-Pastoriza %A Stefan Katzenbeisser %A Mehmet Celik %A Aweke Lemma %K multiparty computation %K privacy %K security %K watermarking %B ACM Workshop on Multimedia and Security (MMSEC) %C Dallas, Texas, USA %P 109–120 %8 September %G eng %0 Conference Paper %B Security, Steganography, and Watermarking of Multimedia Contents %D 2007 %T Security of Spread-Spectrum-Based Data Hiding %A Luis Pérez-Freire %A Pierre Moulin %A Fernando Pérez-González %E Edward J. Delp %E Ping W. Wong %K data-hiding %K security %K watermarking %B Security, Steganography, and Watermarking of Multimedia Contents %S Proc. of SPIE %I SPIE %C San Jose, California, USA %8 January %G eng %0 Journal Article %J IEEE Communications Letters %D 2007 %T Sixth-Order Statistics-Based Non-Data-Aided SNR Estimation %A R. López-Valcarce %A C. Mosquera %B IEEE Communications Letters %V 11 %P 351-353 %8 April %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2007 %T Statistical Analysis of a Linear Algebra Asymmetric Watermarking Scheme %A G. Boato %A C. Fontanari %A F. G. B. De Natale %A Fernando Pérez-González %K watermarking %B IEEE International Conference on Image Processing (ICIP) %C San Antonio, TX, USA %P 1261-1264 %8 September %G eng %0 Journal Article %J International Journal of Adaptive Control and Signal Processing %D 2006 %T Second-order blind algorithms for adaptive recursive linear equalizers: Analysis and lattice implementation %A R. López-Valcarce %K adaptive IIR filters %K blind equalization %K Digital Communications %K lattice filters %B International Journal of Adaptive Control and Signal Processing %V 20 %P 265–289 %8 August %G eng %0 Conference Paper %B Security, Steganography, and Watermarking of Multimedia Contents %D 2006 %T Secret dither estimation in lattice-quantization data hiding: a set-membership approach %A Luis Pérez-Freire %A Fernando Pérez-González %A Pedro Comesaña %E Edward J. Delp %E Ping W. Wong %K data-hiding %K security %K watermarking %B Security, Steganography, and Watermarking of Multimedia Contents %S Proc. of SPIE %I SPIE %C San Jose, California, USA %V 5306 %P 592-601 %8 January %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2006 %T Security of lattice-based data hiding against the Known Message Attack %A Luis Pérez-Freire %A Fernando Pérez-González %A Teddy Furon %A Pedro Comesaña %K data-hiding %K security %K watermarking %B IEEE Transactions on Information Forensics and Security %V 1 %P 421-439 %8 December %G eng %0 Thesis %D 2006 %T Side-informed data hiding: robustness and security analysis %A Pedro Comesaña %K data-hiding %K watermarking %I University of Vigo, Spain %G eng %9 phd %0 Conference Paper %B International Workshop on Signal Processing for Space Communications (SPSC) %D 2006 %T Symbol-Rate Estimation for DVB-S2 Broadcasting %A C. Mosquera %A Sandro Scalise %A R. López-Valcarce %K DVB %K symbol rate %K synchronization %B International Workshop on Signal Processing for Space Communications (SPSC) %G eng %0 Conference Paper %B Security, Steganography, and Watermarking of Multimedia Contents %D 2005 %T Spread-spectrum vs. quantization-based data hiding: misconceptions and implications %A Luis Pérez-Freire %A Fernando Pérez-González %E Edward J. Delp %E Ping W. Wong %K data-hiding %K watermarking %B Security, Steganography, and Watermarking of Multimedia Contents %S Proc. of SPIE %I SPIE %C San Jose, California, USA %V 5306 %P 592-601 %8 January %G eng %0 Conference Paper %B European Signal Processing Conference (EUSIPCO) %D 2004 %T Spread Spectrum Watermarking for Real Images: Is Everything So Hopeless? %A Oleksiy Koval %A Sviatoslav Voloshynovskiy %A Fernando Pérez-González %A Frederic Deguillaume %A Thierry Pun %B European Signal Processing Conference (EUSIPCO) %C Vienna, Austria %8 September 6-10 %G eng %0 Journal Article %J IEEE Communications Letters %D 2003 %T Second order statistical properties of nonlinearly distorted PSK signals %A R. López-Valcarce %A Soura Dasgupta %K Digital Communications %K equalization %K nonlinear channels %K PSK modulation %K second-order statistics %B IEEE Communications Letters %V 7 %P 323–325 %8 July %G eng %0 Journal Article %J IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing %D 2003 %T Subband hyperstable adaptive IIR filters %A R. López-Valcarce %A Fernando Pérez-González %K adaptive IIR filters %K subband adaptive filters %K system identification %B IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing %V 50 %P 383–389 %8 July %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2002 %T Smooth Orthogonal Signal Extensions for Paraunitary Tree-structured Filter Banks %A M. Elena Domínguez-Jiménez %A Nuria González-Prelcic %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Orlando, USA %8 May %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2002 %T Spectral characterization of feedback linear periodically time-varying systems %A C. Mosquera %A Sandro Scalise %A G. Taricco %K burst %K inversion %K LPTV %K PLL %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %G eng %0 Conference Paper %B IEEE International Symposium on Circuits and Systems (ISCAS) %D 2001 %T Second order statistics based blind channel equalization with correlated sources %A R. López-Valcarce %A Soura Dasgupta %K correlated sources %K Digital Communications %K equalization %K second-order statistics %B IEEE International Symposium on Circuits and Systems (ISCAS) %C Sydney, Australia %V 4 %P 366–369 %G eng %0 Journal Article %J IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing %D 2001 %T Some properties of the matrix exponential %A R. López-Valcarce %A Soura Dasgupta %K exponential matrix %K linear algebra %B IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing %V 48 %P 213–215 %8 February %G eng %0 Journal Article %J Automatica %D 2001 %T On the strengthened robust SPR problem for discrete-time systems %A C. Mosquera %A Fernando Pérez-González %K robust %K SPR %K strengthened %B Automatica %V 37 %P 625-628 %8 apr %G eng %0 Journal Article %J IEEE Signal Processing Letters %D 1999 %T Some remarks on the lattice form of the Steiglitz-McBride iteration %A R. López-Valcarce %A Fernando Pérez-González %K adaptive IIR filters %K lattice filters %K system identification %B IEEE Signal Processing Letters %V 6 %P 290–292 %8 November %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1999 %T On the stability of the inverse time-varying prediction error filter obtained with the RWLS algorithm %A R. López-Valcarce %A Soura Dasgupta %K nonstationary processes %K prediction error filters %K stability %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Phoenix, AZ, USA %V 3 %P 1673–1676 %G eng %0 Book Section %B Open Problems in Mathematical Systems and Control Theory %D 1999 %T Stable estimates in equation-error identification: an open problem %A R. López-Valcarce %A S. Dasgupta %B Open Problems in Mathematical Systems and Control Theory %I Springer-Verlag %@ 1-85233-044-9 %G eng %U http://perso.uclouvain.be/vincent.blondel/books/openprobs/ %& 28 %0 Journal Article %J Proc. of the IEEE %D 1999 %T Statistical Analysis of Watermarking Schemes for Copyright Protection of Images %A Juan R. Hernández %A Fernando Pérez-González %K data-hiding %K watermarking %B Proc. of the IEEE %V 87 %P 1142–1166 %8 July %G eng %0 Book Section %B Mathematics in Signal Processing %D 1998 %T The Simultaneous Strict Positive Real Problem: Similarities with the Simultaneous Stability Problem and Applications in Adaptive Recursive Algorithms %A C. Mosquera %A Fernando Pérez-González %E J.G. McWhirter %E I.K. Proudler %K robust %K SPR %B Mathematics in Signal Processing %I Oxford University Press %P 139-148 %G eng %0 Conference Paper %B IEEE Conference on Decision and Control (CDC) %D 1998 %T Stability conditions for the time-varying linear predictor %A R. López-Valcarce %A Soura Dasgupta %A Minyue Fu %A Roberto Tempo %K nonstationary processes %K prediction error filters %K stability %B IEEE Conference on Decision and Control (CDC) %C Tampa, FL, USA %P 1840–1845 %8 December %G eng %0 Journal Article %J IEEE Signal Processing Letters %D 1998 %T On the stability of equation-error estimates of all-pole systems %A R. López-Valcarce %A Soura Dasgupta %K adaptive IIR filters %K system identification %B IEEE Signal Processing Letters %V 5 %P 268–270 %8 October %G eng %0 Conference Paper %B American Control Conference %D 1998 %T On the strengthened robust SPR problem for discrete-time systems %A C. Mosquera %A Fernando Pérez-González %B American Control Conference %G eng %0 Conference Paper %B IEEE Conference on Decision and Control (CDC) %D 1997 %T Stable estimates in equation error identification %A R. López-Valcarce %A Soura Dasgupta %K adaptive IIR filters %K system identification %B IEEE Conference on Decision and Control (CDC) %C San Diego, CA, USA %V 2 %P 1678–1679 %8 December %G eng