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.

%B European Signal Processing Conference (EUSIPCO)
%C Amsterdam (Netherlands)
%8 08/2020
%G eng
%0 Conference Paper
%B 2nd XoveTIC Conference
%D 2019
%T Flexible spectral precoding for OFDM systems
%A Khawar Hussain
%A R. López-Valcarce
%K spectrum shaping
%K winter
%X 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

%B 2nd XoveTIC Conference
%C A Coruña (Spain)
%8 09/2019
%G eng
%R 10.3390/proceedings2019021024
%0 Conference Paper
%B IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)
%D 2019
%T Flexible spectral precoding for sidelobe suppression in OFDM systems
%A Khawar Hussain
%A Ana Lojo
%A R. López-Valcarce
%K spectrum shaping
%K winter
%X 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.

%B IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) %I IEEE %C Brighton, UK %P 4789 - 4793 %8 04/2019 %G eng %R 10.1109/ICASSP.2019.8683162 %0 Conference Paper %B IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) %D 2019 %T Frequency-selective hybrid precoding and combining for mmWave MIMO systems with per-antenna power constraints %A Javier Rodríguez-Fernández %A R. López-Valcarce %A Nuria González-Prelcic %K mmWave %K winter %XConfiguring 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.

%B IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) %I IEEE %C Brighton, UK %P 4794-4798 %8 04/2019 %G eng %R 10.1109/ICASSP.2019.8683831 %0 Journal Article %J IEEE Transactions on Wireless Communications %D 2017 %T FER Estimation in a Memoryless BSC with Variable Frame Length and Unreliable ACK/NAK Feedback %A Alberto Rico-Alvariño %A R. López-Valcarce %A Carlos Mosquera %A Robert W. Heath Jr. %K adaptive signal processing %K compass %K Cramér-Rao bound (CRB) %K frame error rate %K myrada %K winter %XWe 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.

%B IEEE Transactions on Wireless Communications
%V 16
%P 3661 - 3673
%8 06/2017
%G eng
%N 6
%R 10.1109/TWC.2017.2686845
%0 Conference Paper
%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
%D 2017
%T Filter design for delay-based anonymous communications
%A Simon Oya
%A Fernando Pérez-González
%A Carmela Troncoso
%K adversarial signal processing
%K compass
%K Multimedia security
%K winter
%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
%G eng
%0 Journal Article
%J IEEE Transactions on Signal Processing
%D 2016
%T Fast orthonormal sparsifying transforms based on Householder reflectors
%A C. Rusu
%A Nuria González-Prelcic
%A R.W. Heath Jr.
%K compass
%K compressed sensing
%B IEEE Transactions on Signal Processing
%V 64
%P 6589-6599
%8 12/2016
%G eng
%N 24
%R 10.1109/TSP.2016.2612168
%0 Conference Paper
%B IEEE International Conference on Image Processing (ICIP)
%D 2016
%T Fast Sequential Forensic Detection of Camera Fingerprint
%A Fernando Pérez-González
%A Miguel Masciopinto
%A Iria González-Iglesias
%A Pedro Comesaña
%B IEEE International Conference on Image Processing (ICIP)
%G eng
%0 Thesis
%D 2016
%T Flat Fading Channel Estimation Based on Dirty Paper Coding
%A Gabriel Domínguez-Conde
%I University of Vigo
%C Vigo
%G eng
%0 Conference Paper
%B ACM Workshop on Information Hiding and Multimedia Security
%D 2016
%T Forensics of high quality and nearly identical JPEG image recompression
%A Cecilia Pasquini
%A Pascal Schoettle
%A Rainer Bohme
%A Giulia Boato
%A Fernando Pérez-González
%B ACM Workshop on Information Hiding and Multimedia Security
%G eng
%0 Conference Paper
%B Asilomar Conf. on Signals, Systems and Computers
%D 2016
%T Frequency selective multiuser hybrid precoding for mmWave systems with imperfect channel knowledge
%A Jose P. Gonzalez-Coma
%A Nuria González-Prelcic
%A Luis Castedo
%A Robert W. Heath Jr.
%K compass
%K mmWave
%B Asilomar Conf. on Signals, Systems and Computers
%8 11/2016
%G eng
%R 10.1109/ACSSC.2016.7869044
%0 Conference Paper
%B 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop
%D 2016
%T Full-duplex operation in two-way broadcast service for maritime applications
%A Tomás Ramírez
%A Carlos Mosquera
%K compass
%K full duplex
%K satcom
%B 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop
%8 09/2016
%G eng
%0 Journal Article
%J IEEE Transactions on Information Forensics and Security
%D 2015
%T Forensic detection of processing operator chains: recovering the history of filtered JPEG images
%A Valentina Conotter
%A Pedro Comesaña
%A Fernando Pérez-González
%K compass
%K forensics
%B IEEE Transactions on Information Forensics and Security
%G eng
%1 Accepted for publication.

%R 10.1109/TIFS.2015.2424195 %0 Conference Paper %B IEEE International Conference on Communications (ICC) %D 2015 %T Frequency Reuse in Dual Satellite Settings: an Initial Evaluation of Full Duplex Operation %A D. Martiñán-Otero %A C. Mosquera %K compass %K full duplex %K satcom %B IEEE International Conference on Communications (ICC) %G eng %0 Conference Paper %B ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) %D 2014 %T FER prediction with variable codeword length %A Alberto Rico-Alvariño %A Robert W. Heath Jr. %A Carlos Mosquera %K adaptive signal processing %K compass %K dynacs %K Effective SNR %K FER prediction %K PHY abstraction %XFrame 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.

%B ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) %C Florence, Italy %G eng %R 10.1109/ICASSP.2014.6853935 %0 Conference Paper %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2014 %T Flat Fading Channel Estimation Based on Dirty Paper Coding %A Gabriel Domínguez-Conde %A Pedro Comesaña %A Fernando Pérez-González %K channel estimation %K dirty paper coding %K dynacs %K superimposed pilots %XA 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.

%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %C Florence, Italy %G eng %R 10.1109/ICASSP.2014.6854852 %0 Conference Paper %B IEEE International Workshop on Information Forensics and Security (WIFS) %D 2013 %T The flow fingerprinting game %A Juan A. Elices %A Fernando Pérez-González %B IEEE International Workshop on Information Forensics and Security (WIFS) %C Guangzhou, China %P 97–102 %8 11/2013 %G eng %0 Conference Paper %B IEEE International Conference on Image Processing %D 2013 %T Forensic analysis of full-frame linearly filtered JPEG images %A Valentina Conotter %A Pedro Comesaña %A Fernando Pérez-González %K JPEG compression %K linear filtering %B IEEE International Conference on Image Processing %C Melbourne, Australia %P 4517-4521 %8 JPEG compression %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2013 %T Fully Private Noninteractive Face Verification %A Juan Ramón Troncoso-Pastoriza %A Daniel González-Jiménez %A Fernando Pérez-González %K SPED %B IEEE Transactions on Information Forensics and Security %V 8 %P 1101-1114 %8 07/2013 %G eng %N 7 %1To appear

%0 Conference Paper %B IEEE International Workshop on Information Forensics and Security (WIFS) %D 2012 %T Fingerprinting a flow of messages to an anonymous server. %A Juan A. Elices %A Fernando Pérez-González %B IEEE International Workshop on Information Forensics and Security (WIFS) %C Tenerife, Spain %P 97–102 %8 12/2012 %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2012 %T Fully Homomorphic Faces %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K face verification %K homomorphic processing %K lattice cryptography %K privacy %K watermarking %B IEEE International Conference on Image Processing (ICIP) %I IEEE %C Lake Buena Vista, Florida, USA %8 10/2012 %G eng %0 Conference Paper %B European Wireless %D 2010 %T A finite interval constant modulus criterion for multicarrier channel shortening %A E. Ben Salem %A R. López-Valcarce %A H. Besbes %A S. Cherif %B European Wireless %C Lucca, Italy %G eng %0 Journal Article %J Signal Processing %D 2010 %T Frequency estimation of real-valued single-tone in colored noise using multiple autocorrelation lags %A R. Elasmi-Ksibi %A H. Besbes %A R. López-Valcarce %A S. Cherif %K Autocorrelation %K Frequency estimation %K Single sinusoid %B Signal Processing %V 90 %P 2303-2307 %8 July %G eng %0 Conference Paper %B European Signal Processing Conference (EUSIPCO) %D 2008 %T A family of frequency estimators using higher-order sample covariance lags for real sinusoid detection %A R. Elasmi-Ksibi %A R. López-Valcarce %A H. Besbes %A S. Cherif %A M. Jaidane %K Frequency estimator %K Sinusoid detection %B European Signal Processing Conference (EUSIPCO) %C Lausanne, Switzerland %8 August %G eng %0 Conference Paper %B Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on %D 2007 %T Fast-fading channel estimator using DCT and simplified kalman filter %A Schmidt, J.F. %A Cousseau, J.E. %A Wichman, R. %A Gregorio, F.H. %K band-pass filters %K basis function approximations %K channel coefficient %K channel Doppler spectrum %K channel estimation %K channel estimator %K channel variations %K decoupled parameters %K discrete cosine transform %K discrete cosine transforms %K Doppler effect %K fading channels %K fast-fading channel %K Kalman filter %K Kalman filters %K low complexity estimator %K narrow-band filters %K passband filters %K training symbols %B Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on %P 1 -5 %8 june %G eng %R 10.1109/SPAWC.2007.4401355 %0 Conference Paper %B International Workshop on Information Hiding (IH) %D 2005 %T Fundamentals of data hiding security and their application to spread-spectrum analysis %A Pedro Comesaña %A Luis Pérez-Freire %A Fernando Pérez-González %E Mauro Barni %E Jordi Herrera-Joancomartí %E Stefan Katzenbeisser %E Fernando Pérez-González %K data-hiding %K watermarking %B International Workshop on Information Hiding (IH) %S Lecture Notes in Computer Science %I Springer-Verlag Heidelberg %C Barcelona, Spain %V 3727 %P 131-145 %8 June %G eng %0 Conference Paper %B International Workshop on Signal Processing for Space Communications (SPSC) %D 2003 %T Feedback Timing Synchronization for IF-Sampled Systems %A C. Mosquera %A M. Cacheda %K PLC %B International Workshop on Signal Processing for Space Communications (SPSC) %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1998 %T Filtered error adaptive IIR algorithms and their application to active noise control %A C. Mosquera %A J.A. Gómez %A Fernando Pérez-González %K adaptive %K IIR %K SPR %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %G eng %0 Conference Paper %B IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis %D 1998 %T A Flexible Structure for Wavelet Packet-based Subband Adaptive Equalization %A Nuria González-Prelcic %A Fernando Pérez-González %A A.B. Mosquera-González %B IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis %C Pittsburgh, USA %P 377–380 %8 October %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1997 %T A Fast Noise-Scaling Algorithm for Uniform Quantization in Audio Coding Schemes %A Carlos Serantes %A Antonio S. Pena %A Nuria González-Prelcic %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Munich, Germany %8 May %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1997 %T A Flexible Tiling of the Time Axis for Adaptive Wavelet Packet Audio Decompositions %A Nuria González-Prelcic %A Antonio S. Pena %A Carlos Serantes %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Munich, Germany %8 May %G eng