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.

%B Signal Processing %V 144 %P 226-237 %8 03/2018 %G eng %U https://authors.elsevier.com/a/1W90XbZX4rsob %R 10.1016/j.sigpro.2017.10.012 %0 Conference Paper %B 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. %D 2018 %T Practical Implementation of Link Adaptation with Dual Polarized Modulation (Best paper award) %A Anxo Tato %A Carlos Mosquera %A Pol Henarejos %A Ana Pérez-Neira %B 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. %G eng %1Best paper award

%0 Conference Paper %B European Signal Processing Conference (EUSIPCO) %D 2018 %T Putting the PRNU Model in Reverse Gear: Findings with Synthetic Signals %A Miguel Masciopinto %A Fernando Pérez-González %B European Signal Processing Conference (EUSIPCO) %C Rome, Italy %8 2018 %G eng %0 Journal Article %J Linear Algebra and its Applications %D 2016 %T Properties of real and complex ETFs and their application to the design of low coherence frames %A Cristian Rusu %A Nuria González-Prelcic %A Robert W. Heath Jr. %B Linear Algebra and its Applications %V 508 %P 81-90 %8 November, 2016 %G eng %U http://www.sciencedirect.com/science/article/pii/S0024379516302555 %0 Conference Paper %B Twelfth International Symposium on Wireless Communication Systems (ISWCS) %D 2015 %T Pushing for higher rates and efficiency in Satcom: the different perspectives within SatNExIV %A Miguel Ángel Vázquez %A Ana Pérez Neira %A Carlos Mosquera %A Bhavani Shankar %A Pol Henarejos %A Athanasios Panagopoulos %A Giovanni Giambene %A Vasilios Siris %A George Polyzos %A Nader Alagha %K satcom %B Twelfth International Symposium on Wireless Communication Systems (ISWCS) %C Brussels %G eng %0 Journal Article %J IEEE Transactions on Wireless Communications %D 2014 %T Performance of the Multibeam Satellite Return Link with Correlated Rain Attenuation %A Arnau, Jesus %A Christopoulos, D. %A Chatzinotas, S. %A C. Mosquera %A Ottersten, B. %K Antennas %K Approximation methods %K Attenuation %K Correlation %K dynacs %K Rain %K satcom %K Satellites %K Signal to noise ratio %XRain 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.

%B IEEE Transactions on Wireless Communications %P 1-1 %G eng %R 10.1109/TWC.2014.2329682 %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2014 %T Power spectrum blind sampling using optimal multicoset sampling patterns in the MSE sense %A Bamrung TauSiesakul %A Nuria González-Prelcic %K cognitive radio %K dynacs %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %G eng %R 10.1109/ICASSP.2014.6853758 %0 Conference Paper %B Asilomar Conference on Signals, Systems and Computers %D 2013 %T Power Spectrum Blind Sampling Using Minimum Mean Square Error and Weighted Least Squares %A Bamrung TauSiesakul %A Nuria González-Prelcic %K cognitive radio %K dynacs %B Asilomar Conference on Signals, Systems and Computers %8 11/2013 %G eng %R 10.1109/ACSSC.2013.6810249 %0 Journal Article %J IEEE Signal Processing Magazine %D 2013 %T Privacy-Preserving Data Aggregation in Smart Metering Systems: An Overview %A Zekeriya Erkin %A Juan Ramón Troncoso-Pastoriza %A Reginald Lagendijk %A Fernando Pérez-González %K SPED %B IEEE Signal Processing Magazine %V 30 %P 75-86 %8 03/2013 %G eng %N 2 %0 Conference Paper %B 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) %D 2012 %T Performance Analysis of Multiuser Detection for Multibeam Satellites Under Rain Fading %A Arnau, Jesus %A C. Mosquera %K dynacs %K hybrid beamforming %K multibeam satellites. %K Multiuser detection %K rain fading %K satcom %XMultibeam 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.

%B 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) %C Baiona, Spain %G eng %R 10.1109/ASMS-SPSC.2012.6333078 %0 Journal Article %J EURASIP Journal on Wireless Communications and Networking %D 2012 %T Performance study of multiuser interference mitigation schemes for hybrid broadband multibeam satellite architectures %A Arnau, Jesus %A Bertrand Devillers %A C. Mosquera %A Ana Pérez-Neira %B EURASIP Journal on Wireless Communications and Networking %V 2012 %P 132 %G eng %U http://jwcn.eurasipjournals.com/content/2012/1/132 %R 10.1186/1687-1499-2012-132 %0 Conference Paper %B Information Sciences and Systems (CISS), 2011 45th Annual Conference on %D 2011 %T Prediction based resource allocation in OFDMA %A Schmidt, J.F. %A Cousseau, J.E. %A Wichman, R. %A Werner, S. %K empirical characterization %K frequency division multiple access %K low-complexity channel predictor %K mobile radio %K mobile stations %K mobile wireless channels %K OFDM modulation %K OFDMA downlink %K orthogonal frequency division multiple access downlink %K perfect channel state information %K prediction error characterization %K prediction-based RA strategies %K prediction-based resource allocation algorithm %K wireless channels %B Information Sciences and Systems (CISS), 2011 45th Annual Conference on %P 1 -4 %8 march %G eng %R 10.1109/CISS.2011.5766224 %0 Conference Paper %B IEEE International Workshop on Information Forensics and Security (WIFS) %D 2011 %T Prefilter Design for Forensic Resampling Estimation %A David Vázquez-Padín %A Fernando Pérez-González %XStarting 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.

%B IEEE International Workshop on Information Forensics and Security (WIFS) %I IEEE %C Foz do Iguaçu, Brazil %P 1-6 %8 12/2011 %G eng %R 10.1109/WIFS.2011.6123133 %0 Conference Paper %B Advanced Satellite Multimedia Systems Conference (ASMA) %D 2010 %T Performance Analysis of Distributed Tracking with Consensus on Noisy Time-Varying Graphs %A Yongxiang Ruan %A Sudhaman K. Jayaweera %A C. Mosquera %K connectivity graph %K distributed local Kalman filtering %K distributed tracking %K distributed tracking with consensus %K graph topology %K network theory (graphs) %K noisy communications links %K noisy time-varying graphs %K performance analysis %K telecommunication links %K telecommunication network topology %K time-varying network topology %K time-varying systems %B Advanced Satellite Multimedia Systems Conference (ASMA) %C Cagliari, Italy %P 395-400 %G eng %0 Journal Article %J IEEE Transactions on Wireless Communications %D 2010 %T Primary User Enters the Game: Performance of Dynamic Spectrum Leasing in Cognitive Radio Networks %A Gonzalo Vázquez-Vilar %A C. Mosquera %A Sudhaman K. Jayaweera %B IEEE Transactions on Wireless Communications %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2009 %T Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method %A Gabriel Domínguez-Conde %A Pedro Comesaña %A Fernando Pérez-González %K cryptography %K error statistics %K false negative probabilities %K false positive probabilities %K Fridrich-Goljan self-embedding authentication method %K hash bit errors %K image authentication method %K image coding %K message authentication %K performance analysis %K robust hashing %K watermarking %B IEEE International Conference on Image Processing (ICIP) %C Cairo, Egypt %8 November %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2009 %T Performance Analysis of Fridrich-Goljan Self-Embedding Authentication Method %A Gabriel Domínguez-Conde %A Pedro Comesaña %A Fernando Pérez-González %K cryptography %K error statistics %K false negative probabilities %K false positive probabilities %K Fridrich-Goljan self-embedding authentication method %K hash bit errors %K image authentication method %K image coding %K message authentication %K performance analysis %K robust hashing %K watermarking %B IEEE Transactions on Information Forensics and Security %V 4 %P 570-577 %8 Sept. %G eng %0 Generic %D 2007 %T Practical estimators of the secret spreading vector for Improved Spread Spectrum modulations. Statistical analysis and results %A Luis Pérez-Freire %K data-hiding %K security %K watermarking %I Signal Theory and Communications Department, University of Vigo, Spain %8 November %G eng %9 Internal report %0 Conference Paper %B ACM Conference on Computer and Communications Security (CCS) %D 2007 %T Privacy Preserving Error Resilient DNA Searching through Oblivious Automata %A Juan Ramón Troncoso-Pastoriza %A Stefan Katzenbeisser %A Mehmet Celik %K DNA %K privacy %K security %K watermarking %B ACM Conference on Computer and Communications Security (CCS) %I ACM Press %C Alexandria, Virginia, USA %P 519–528 %8 Oct 29–Nov 2 %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2007 %T Putting Reproducible Signal Processing into Practice: A Case Study in Watermarking %A Mauro Barni %A Fernando Pérez-González %A Pedro Comesaña %A Guido Bartoli %K data-hiding %K watermarking %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Honolulu, HW, USA %V 4 %P 1261-1264 %8 April %G eng %0 Conference Paper %B Vehicular Technology Conference (VTC) %D 2004 %T Performance of Coding and Synchronization Schemes for a DVB-S Based Air-Interface in the Railway Environment %A Sandro Scalise %A Giorgio Sciascia %A Marcos Álvarez-Díaz %A Harald Ernst %A Rodolfo Mura %K Digital Communications %K DVB-S %K satellite communications %B Vehicular Technology Conference (VTC) %C Milano, Italy %V 1 %P 347-351 %8 May 17-19 %G eng %0 Conference Paper %B International Symposium on Power Line Communications and Its Applications (ISPLC) %D 2004 %T POLI-MAS: Power-Line Multichannel Audio System %A Fernando J. Mato-Méndez %A C. Mosquera %K audio %K multichannel %K PLC %B International Symposium on Power Line Communications and Its Applications (ISPLC) %G eng %0 Journal Article %J IEEE Transactions on Signal Processing %D 2003 %T Performance Analysis of Existing and New Methods for Data Hiding with Known-Host Information in Additive Channels %A Fernando Pérez-González %A Félix Balado %A Juan R. Hernández %K data-hiding %K watermarking %B IEEE Transactions on Signal Processing %V 51 %P 960-980 %G eng %0 Conference Paper %B International Workshop on Signal Processing for Space Communications (SPSC) %D 2003 %T Performance of DVB-S Air-Interface over Land Mobile Satellite Channel at Ku-Band for Fast Trains %A Marcos Álvarez-Díaz %A Sandro Scalise %A Giorgio Sciascia %A Rodolfo Mura %A Paolo Conforto %A Vincenzo Schena %A Harald Ernst %K Digital Communications %K DVB-S %K satellite communications %B International Workshop on Signal Processing for Space Communications (SPSC) %C Catania, Italia %8 September 24-26 %G eng %0 Conference Paper %B European Signal Processing Conference (EUSIPCO) %D 2002 %T Polynomial extension method for size-limited paraunitary filter banks %A M. Elena Domínguez-Jiménez %A Nuria González-Prelcic %B European Signal Processing Conference (EUSIPCO) %C Toulouse, France %8 September %G eng %0 Conference Paper %B IEEE International Conference on Multimedia and Expo (ICME) %D 2002 %T Provably or Probably Robust Data Hiding? %A Félix Balado %A Fernando Pérez-González %K data-hiding %K watermarking %B IEEE International Conference on Multimedia and Expo (ICME) %C Lausanne, Switzerland %8 August %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1999 %T Processing Finite Length Signals via Filter Banks without Border Distortions: A Non-Expansionist Solution %A M. Elena Domínguez-Jiménez %A Nuria González-Prelcic %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Phoenix, USA %8 March %G eng %0 Journal Article %J IEEE Journal on Selected Areas in Communications %D 1998 %T Performance Analysis of a 2D-Multipulse Amplitude Modulation Scheme for Data Hiding and Watermarking of Still Images %A Juan R. Hernández %A Fernando Pérez-González %A José M. Rodríguez %A Gustavo Nieto %K data-hiding %K watermarking %B IEEE Journal on Selected Areas in Communications %V 16 %P 510–524 %8 May %G eng