%0 Conference Paper %B IEEE 99th Vehicular Technology Conference: VTC2024-Spring. Workshop "Radio Map for 6G Communications" %D 2024 %T Radio Maps for Beam Alignment in mmWave Communications with Location Uncertainty %A Tien, Ngoc-Ha %A Daniel Romero %A R. López-Valcarce %K mayte %K mmWave %K radio maps %X
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.
%B IEEE 99th Vehicular Technology Conference: VTC2024-Spring. Workshop "Radio Map for 6G Communications" %C Singapore %8 accepted %G eng %0 Conference Paper %B VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) %D 2021 %T A Review of "Camera Attribution Forensic Analyzer in the Encrypted Domain" %A Alberto Pedrouzo-Ulloa %A Miguel Masciopinto %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %B VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC) %I Ediciones de la Universidad de Castilla-La Mancha %G eng %1

JNIC 2021 Best Extended Abstract Paper Award

%0 Journal Article %J Mathematics %D 2021 %T Revisiting multivariate ring learning with errors and its applications on lattice-based cryptography %A Alberto Pedrouzo-Ulloa %A Juan Ramón Troncoso-Pastoriza %A Nicolas Gama %A Mariya Georgieva %A Fernando Pérez-González %B Mathematics %V 9 %G eng %N 8 %& 858 %0 Conference Paper %B 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2020 %T Resource Management in the multibeam NOMA-based satellite downlink %A Tomás Ramírez %A Carlos Mosquera %B 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %G eng %0 Conference Paper %B 2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS) %D 2020 %T Robustness analysis of beamforming based designs for mmWave Full-Duplex Amplify-and-Forward relays %A R. López-Valcarce %A M. Martínez-Cotelo %K full-duplex %K mmWave %K rodin %X
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.
%B 2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS) %8 12/2020 %G eng %0 Conference Paper %B IEEE European Symposium on Security and Privacy (EuroS&P) %D 2019 %T Rethinking Location Privacy for Unknown Mobility Behaviors %A Simon Oya %A Carmela Troncoso %A Fernando Pérez-González %B IEEE European Symposium on Security and Privacy (EuroS&P) %G eng %0 Conference Paper %B ACM Information Hiding and Multimedia Security Workshop (IH&MMSec) %D 2019 %T Revisiting Multivariate Lattices for Encrypted Signal Processing %A Alberto Pedrouzo-Ulloa %A Juan Ramón Troncoso-Pastoriza %A Fernando Pérez-González %K homomorphic encryption %K Lattice-Based Cryptography %K Multidimensional Signal Processing %K Secure Signal Processing %B ACM Information Hiding and Multimedia Security Workshop (IH&MMSec) %I ACM %C Paris, France %G eng %0 Journal Article %J IEEE Transactions on Information Forensics and Security %D 2017 %T A Random Matrix Approach to the Forensic Analysis of Upscaled Images %A David Vázquez-Padín %A Fernando Pérez-González %A Pedro Comesaña %K Multimedia security %K winter %B IEEE Transactions on Information Forensics and Security %V 12 %P 2115-2130 %8 09/2017 %G eng %N 9 %& 2115 %0 Conference Paper %B International Tyrrhenian Workshop on Digital Communication 2017 %D 2017 %T Random Matrix Theory for Modeling the Eigenvalue Distribution of Images under Upscaling %A David Vázquez-Padín %A Fernando Pérez-González %A Pedro Comesaña %K Multimedia security %K winter %X

 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.

%B International Tyrrhenian Workshop on Digital Communication 2017 %I Springer International Publishing %C Palermo, Italy %P 109-124 %8 09/2017 %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2017 %T Robust clustering of data collected via crowdsourcing %A Alba Pagès-Zamora %A Georgios Giannakis %A R. López-Valcarce %A Pere Gimenez-Febrer %K winter %K wsn %X

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.

%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %C New Orleans %P 4014 - 4018 %8 03/2017 %G eng %R 10.1109/ICASSP.2017.7952910 %0 Conference Paper %B Information Theory and Applications Workshop (ITA %D 2016 %T Radar aided mmWave beam alignment in V2I communications supporting antenna diversity %A Nuria González-Prelcic %A R. Méndez-Rial %A R.W. Heath Jr. %K compass %K mmWave %B Information Theory and Applications Workshop (ITA %8 January, 2016 %G eng %0 Conference Paper %B 20th International ITG Workshop on Smart Antennas (WSA) %D 2016 %T Robust analog precoding designs for millimeter wave MIMO transceivers %A Pengfei Xia %A Robert Heath %A Nuria González-Prelcic %K compass %K mmWave %B 20th International ITG Workshop on Smart Antennas (WSA) %8 March, 2016 %G eng %0 Journal Article %J IEEE Trans. Communications %D 2016 %T Robust analog precoding designs for millimeter wave MIMO transceivers with frequency and time division duplexing %A Pengfei Xia %A Robert W. Heath Jr. %A Nuria González-Prelcic %K compass %K mmWave %X

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.

%B IEEE Trans. Communications %V 64 %P 4622 - 4634 %8 11/2016 %G eng %N 11 %R 10.1109/TCOMM.2016.2604312 %0 Conference Paper %B IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC %D 2015 %T Robust Adaptive Coding and Modulation Scheme for the Mobile Satellite Forward Link %A Alberto Rico-Alvariño %A Anxo Tato %A Carlos Mosquera %K compass %K satcom %B IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2010 %T On the Role of Differentiation for Resampling Detection %A Nahuel Dalgaard %A C. Mosquera %A Fernando Pérez-González %K cyclostationarity %K Image forensics %K interpolation %K prefiltering %K resampling detection %K watermarking %B IEEE International Conference on Image Processing (ICIP) %I IEEE %C Hong Kong, China %8 September %G eng %0 Journal Article %J Signal Processing %D 2006 %T Robustness Improvement of Known-Host-State Watermarking Using Host Statistics %A Oleksiy Koval %A Sviatoslav Voloshynovskiy %A Jose Emilio Vila-Forcén %A Fernando Pérez-González %A Frederic Deguillaume %A Thierry Pun %K data-hiding %K watermarking %B Signal Processing %V 86 %P 1076-1088 %8 May %G eng %0 Journal Article %J IEEE Transactions on Signal Processing %D 2005 %T Rational Dither Modulation: a high-rate data-hiding method robust to gain attacks %A Fernando Pérez-González %A C. Mosquera %A Mauro Barni %A Andrea Abrardo %K data-hiding %K watermarking %B IEEE Transactions on Signal Processing %V 53 %P 3960-3975 %8 October %G eng %0 Journal Article %J IEEE Transactions on Signal Processing %D 2005 %T Realizable minimum mean-squared error channel shorteners %A R. López-Valcarce %K adaptive signal processing %K Channel shortening %B IEEE Transactions on Signal Processing %V 53 %P 4354–4362 %8 November %G eng %R 10.1109/TSP.2005.857050 %0 Conference Paper %B International Workshop on Digital Watermarking (IWDW) %D 2005 %T The return of the sensitivity attack %A Pedro Comesaña %A Luis Pérez-Freire %A Fernando Pérez-González %E Mauro Barni %E Ingemar J. Cox %E Ton Kalker %E H. J. Kim %K data-hiding %K watermarking %B International Workshop on Digital Watermarking (IWDW) %S Lecture Notes in Computer Science %I Springer-Verlag Heidelberg %C Siena, Italy %V 3710 %P 260-274 %8 September %G eng %0 Conference Paper %B Conference on Communications and Multimedia Security (CMS) %D 2005 %T On reversibility of random binning techniques: multimedia perspectives %A Sviatoslav Voloshynovskiy %A Oleksiy Koval %A E. Topak %A Jose Emilio Vila-Forcén %A Pedro Comesaña %A Thierry Pun %K data-hiding %K watermarking %B Conference on Communications and Multimedia Security (CMS) %S Lecture Notes in Computer Science %I Springer-Verlag Heidelberg %C Salzburg, Austria %8 September %G eng %0 Conference Paper %B Security, Steganography, and Watermarking of Multimedia Contents %D 2005 %T Robustness Improvement of Known-Host-State Watermarking Using Host Statistics %A Oleksiy Koval %A Sviatoslav Voloshynovskiy %A Frederic Deguillaume %A Fernando Pérez-González %A Thierry Pun %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 IEEE International Workshop on Multimedia Signal Processing %D 2004 %T Rational Dither Modulation: a novel data-hiding method robust to value-metric attacks %A Fernando Pérez-González %A Mauro Barni %A Andrea Abrardo %A C. Mosquera %K data-hiding %K watermarking %B IEEE International Workshop on Multimedia Signal Processing %C Siena, Italy %P 139-142 %8 29 Sept - 1 Oct %G eng %0 Journal Article %J IEEE Transactions on Signal Processing %D 2004 %T Realizable linear and decision feedback equalizers: properties and connections %A R. López-Valcarce %K adaptive signal processing %K channel equalization %B IEEE Transactions on Signal Processing %V 52 %P 757–773 %8 March %G eng %1

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

%R 10.1109/TSP.2003.822360 %0 Conference Paper %B IEEE International Workshop on Multimedia Signal Processing %D 2004 %T Revealing the true achievable rates of Scalar Costa Scheme %A Luis Pérez-Freire %A Fernando Pérez-González %A Sviatoslav Voloshynovskiy %K data-hiding %K watermarking %B IEEE International Workshop on Multimedia Signal Processing %C Siena, Italy %P 203-206 %8 29 Sept - 1 Oct %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 2002 %T Road vehicle speed estimation from a two-microphone array %A Fernando Pérez-González %A R. López-Valcarce %A C. Mosquera %K microphone arrays %K speed estimation %K traffic monitoring %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Orlando, FL, USA %V 2 %P 1321–1324 %G eng %0 Conference Paper %B IEEE Workshop on Statistical Signal Processing (SSP) %D 2000 %T The role of second-order statistics in blind equalization of nonlinear channels %A R. López-Valcarce %A Soura Dasgupta %K Digital Communications %K equalization %K nonlinear channels %K second-order statistics %B IEEE Workshop on Statistical Signal Processing (SSP) %C Pocono Manor, PA, USA %P 211–215 %G eng %0 Journal Article %J Signal Processing %D 1999 %T The robust SPR problem: design algorithms and new applications %A C. Mosquera %A L. Leyra %A Fernando Pérez-González %K robust %K SPR %B Signal Processing %V 76 %P 269-283 %G eng %0 Thesis %D 1998 %T Relaxation of the SPR condition with applications to the convergence of adaptive recursive algorithms %A C. Mosquera %I University of Vigo, Spain %G eng %9 phd