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.

%B ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing %G eng %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 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 Proceedings
%B 9th EAI International Conference on Wireless and Satellite Systems, WISATS
%D 2017
%T Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems
%A Anxo Tato
%A Pol Henarejos
%A Carlos Mosquera
%A Ana Pérez-Neira
%X 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.

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.

%B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %P 6193-6197 %8 03/2017 %G eng %0 Conference Paper %B 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop %D 2016 %T Advanced Signal Processing Techniques for Fixed and Mobile Satellite Communications %A Pol Henarejos %A Ana Pérez-Neira %A Nicolò Mazzali %A Carlos Mosquera %K compass %K full duplex %K satcom %B 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop %8 09/2016 %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2016 %T Array thinnig for antenna selection in millimeter wave MIMO systems %A C. Rusu %A Nuria González-Prelcic %A R. W. Heath Jr %K compass %K mmWave %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %8 2016 %G eng %0 Conference Paper %B Information Theory and Applications Workshop (ITA %D 2016 %T Estimating millimeter wave channels using out-of-band measurements %A Anum Ali %A Nuria González-Prelcic %A R.W. Heath Jr. %K compass %K mmWave %B Information Theory and Applications Workshop (ITA %8 January, 2016 %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 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 IEEE Global Telecommunications Conf. (GLOBECOM) %D 2016 %T Hybrid precoders and combiners for mmWave MIMO systems with per-antenna power constraints %A R. López-Valcarce %A Nuria González-Prelcic %A Cristian Rusu %A R. W. Heath, Jr %K compass %K mmWave %XThis 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.

%B IEEE Global Telecommunications Conf. (GLOBECOM)
%G eng
%0 Journal Article
%J IEEE Trans. Wireless Communications
%D 2016
%T Low complexity hybrid precoding strategies for millimeter wave communication systems
%A Cristian Rusu
%A Roi Méndez-Rial
%A Nuria González-Prelcic
%A Robert W. Heath Jr.
%K compass
%K mmWave
%X 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.

%B IEEE Trans. Wireless Communications %V 15 %P 8380 - 8393 %8 12/2016 %G eng %N 12 %R 10.1109/TWC.2016.2614495 %0 Journal Article %J IEEE J. Selected Topics in Signal Processing. Special issue on Signal Processing for Millimeter Wave Wireless Communications %D 2016 %T An overview of signal processing techniques for millimeter wave MIMO systems %A Robert W. Heath Jr. %A Nuria González-Prelcic %A Sundeep Rangan %A Wonil Roh %A Akbar M. Sayeed %K compass %K mmWave %XCommunication 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.

%B IEEE J. Selected Topics in Signal Processing. Special issue on Signal Processing for Millimeter Wave Wireless Communications %V 10 %P 436 - 453 %8 04/2016 %G eng %N 3 %R 10.1109/JSTSP.2016.2523924 %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 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 %XMillimeter 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 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 International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2016 %T The use of unit norm tight measurement matrices for one-bit compressed sensing %A C. Rusu %A Nuria González-Prelcic %A R. W. Heath Jr. %K compass %K compressed sensing %XIn 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

%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %8 2016 %G eng %0 Conference Paper %B IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) %D 2015 %T Adaptive hybrid precoding and combining in mmWave multiuser MIMO systems based on compressed covariance estimation %A R. Méndez-Rial %A Nuria González-Prelcic %A R. W. Heath Jr. %K compass %K mmWave %B IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) %8 December, 2015 %G eng %0 Conference Paper %B IEEE Global Telecommunications Conf. (GLOBECOM), %D 2015 %T Adaptive one-bit compressive sensing with application to low-precision receivers at mmWave %A C. Rusu %A R. Méndez-Rial %A Nuria González-Prelcic %A R. W. Heath, Jr %K compass %K mmWave %B IEEE Global Telecommunications Conf. (GLOBECOM), %8 December, 2015 %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2015 %T An attack on antenna subset modulation for millimeter-wave communication %A Cristian Rusu %A Nuria González-Prelcic %A Robert W. Heath Jr. %K adversarial signal processing %K compass %K mmWave %XAntenna 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.

%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %I IEEE %C Brisbane, Australia %P 2914-2918 %8 04/2015 %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %D 2015 %T Augmented covariance estimation with a cyclic approach in DOA %A Roi Méndez-Rial %A Nuria González-Prelcic %A Robert W. Heath Jr. %K DOA estimation %K Non-uniformly spaced arrays %XHigh 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.

%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) %I IEEE %C Brisbane, Australia %P 2784-2788 %8 04/2015 %G eng %0 Conference Paper %B IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %D 2015 %T Dictionary-free Hybrid Precoders and Combiners for mmWave MIMO Systems %A Roi Méndez-Rial %A Cristian Rusu %A Nuria González-Prelcic %A Robert W. Heath Jr. %K compass %K mmWave %B IEEE Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %I IEEE %C Stockholm, Sweden %8 06/2015 %G eng %0 Conference Paper %B IEEE Int. Conference on Communications (ICC) %D 2015 %T Low Complexity Hybrid Sparse Precoding and Combining in Millimeter Wave MIMO Systems %A Cristian Rusu %A Roi Méndez-Rial %A Nuria González-Prelcic %A Robert W. Heath Jr. %K compass %K mmWave %B IEEE Int. Conference on Communications (ICC) %I IEEE %C London, UK %8 06/2015 %G eng %0 Conference Paper %B Asilomar Conf. on Signals, Systems, and Computers %D 2015 %T Low Resolution Adaptive Compressed Sensing for mmWave MIMO receivers %A C. Rusu %A Nuria González-Prelcic %A R.W. Heath Jr. %K compass %K mmWave %B Asilomar Conf. on Signals, Systems, and Computers %8 November, 2015 %G eng %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 Conference Paper %B Asilomar Conf. on Signals, Systems and Computers %D 2014 %T Channel estimation in millimeter wave MIMO systems with one-bit quantization %A Jianhua Mo %A Phil Schniter %A Nuria González-Prelcic %A Robert W. Heath Jr. %K adaptive signal processing %K compass %K mmWave %B Asilomar Conf. on Signals, Systems and Computers %G eng %R 10.1109/ACSSC.2014.7094595 %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 Journal Article %J IEEE Transactions on Wireless Communications %D 2014 %T Learning-Based Adaptive Transmission for Limited Feedback Multiuser MIMO-OFDM %A Alberto Rico-Alvariño %A Robert W. Heath Jr. %K adaptive signal processing %K dynacs %B IEEE Transactions on Wireless Communications %G eng %R 10.1109/TWC.2014.2314104 %0 Journal Article %J IEEE Communications Magazine %D 2014 %T MIMO precoding and combining solutions for millimeter wave systems %A Ahmed Alkhateeb %A Jianhua Mo %A Nuria González-Prelcic %A Robert W. Heath Jr. %K adaptive signal processing %K compass %K mmWave %XMillimeter-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.

%B IEEE Communications Magazine %V 52 %P 122-131 %8 12/2014 %G eng %N 12 %R 10.1109/MCOM.2014.6979963 %0 Conference Paper %B 21st European Signal Processing Conference 2013 (EUSIPCO 2013) %D 2013 %T Learning Based Link Adaptation in Multiuser MIMO-OFDM %A Alberto Rico-Alvariño %A Robert W. Heath Jr. %K dynacs %K link adaptation %K Machine Learning %K Multiuser MIMO-OFDM %XLink 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.

%B 21st European Signal Processing Conference 2013 (EUSIPCO 2013) %C Marrakech, Morocco %G eng %0 Conference Paper %B Asilomar Conference on Signals Systems and Computers %D 2013 %T Link Adaptation in MIMO-OFDM with Practical Impairments %A Alberto Rico-Alvariño %A Robert W. Heath Jr. %K dynacs %K link adaptation %K MIMO-OFDM %B Asilomar Conference on Signals Systems and Computers %G eng %R 10.1109/ACSSC.2013.6810579 %0 Conference Paper %B ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) %D 2010 %T Dynamic Spectrum Leasing (DSL) in Dynamic Channels %A Georges El-Howayek %A Sudhaman K. Jayaweera %A Kamrul Hakim %A Gonzalo Vázquez-Vilar %A C. Mosquera %K cognitive radio %K DSL %K dynamic spectrum leasing %K game theory %K Rayleigh fading %K time-varying channels %K time-varying secondary system %B ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) %C Cape Town, South Africa %8 May 23 %G eng %0 Journal Article %J IEEE Transactions on Wireless Communications %D 2010 %T Efficient Dynamic Spectrum Sharing in Cognitive Radio Networks: Centralized Dynamic Spectrum Leasing (C-DSL) %A Kamrul Hakim %A Sudhaman K. Jayaweera %A Georges El-Howayek %A C. Mosquera %B IEEE Transactions on Wireless Communications %V 9 %P 2956-2967 %G eng %0 Conference Paper %B Media Forensics and Security %D 2009 %T Model-based steganalysis using invariant features %A Tu-Thach Quach %A Fernando Pérez-González %A Gregory L. Heileman %K Invariant features %K Model-based %K Steganalysis %B Media Forensics and Security %C San Jose, CA, U.S.A. %8 January %G eng %0 Conference Paper %B IEEE Broadband Wireless Access Workshop %D 2009 %T A Unified Framework for Dynamic Spectrum Leasing (DSL) in Cognitive Radios %A Sudhaman K. Jayaweera %A Kamrul Hakim %A C. Mosquera %B IEEE Broadband Wireless Access Workshop %G eng %0 Conference Paper %B IEEE International Conference on Image Processing (ICIP) %D 2007 %T Benford's Law in Image Processing %A Fernando Pérez-González %A Gregory L. Heileman %A Chaouki T. Abdallah %K benford %K benford's-law %B IEEE International Conference on Image Processing (ICIP) %C San Antonio, TX, USA %8 September %G eng %0 Book Section %D 2007 %T Digital Satellite Communications %A Sandro Scalise %A L. Castanet %A M. Luglio %A Neri, Massimo %A Marcos Álvarez-Díaz %A J. Bito %A M. Bousquet %A I. Frigyes %A P. Horvath %A Axel Jahn %A M. Krejcarek %A J. Lemorton %A S. Morosi %A M. A. Vázquez-Castro %I Springer %C New York %P - %8 April %G eng %& Satellite Channel Impairments %0 Conference Paper %B European Control Conference (ECC) %D 2007 %T A Generalization of Benford's Law and Its Application to Images %A Fernando Pérez-González %A Gregory L. Heileman %A Chaouki T. Abdallah %K benford %K benford's-law %B European Control Conference (ECC) %C Kos, Greece %8 July %G eng %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 Information Hiding (IH) %D 2005 %T Information-theoretic analysis of security in side-informed data hiding %A Luis Pérez-Freire %A Pedro Comesaña %A Fernando Pérez-González %E Mauro Barni %E Jordi Herrera-Joancomartí %E Stefan Katzenbeisser %E Fernando Pérez-González %K data-hiding %K security %K watermarking %B International Workshop on Information Hiding (IH) %S Lecture Notes in Computer Science %I Springer-Verlag Heidelberg %V 3727 %P 131-145 %G eng %0 Conference Paper %B European Signal Processing Conference (EUSIPCO) %D 2004 %T Bias analysis and removal of a microphone array based road traffic speed estimator %A R. López-Valcarce %A D. Hurtado %A C. Mosquera %A Fernando Pérez-González %K microphone arrays %K speed estimation %K traffic monitoring %B European Signal Processing Conference (EUSIPCO) %C Vienna, Austria %G eng %0 Conference Paper %B AIAA International Communications Satellite Systems Conference (ICSSC) %D 2003 %T Link Performance for Mobile Satellite Based Services in Ku-Band %A Giorgio Sciascia %A Sandro Scalise %A Harald Ernst %A Marcos Álvarez-Díaz %A Matthias Holzbock %A Rodolfo Mura %K Digital Communications %K satellite communications %B AIAA International Communications Satellite Systems Conference (ICSSC) %C Yokohama, Japan %8 April 15-19 %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 Journal Article %J Signal Processing %D 2001 %T Approaching the Capacity Limit in Image Watermarking: A Perspective on Coding Techniques for Data Hiding Applications %A Fernando Pérez-González %A Juan R. Hernández %A Félix Balado %K data-hiding %K watermarking %B Signal Processing %V 81 %P 1215–1238 %8 June %G eng %0 Journal Article %J IEEE Transactions on Image Processing %D 2000 %T DCT-Domain Watermarking Techniques for Still Images: Detector Performance Analysis and a New Structure %A Juan R. Hernández %A Martín Amado %A Fernando Pérez-González %K data-hiding %K watermarking %B IEEE Transactions on Image Processing %V 9 %P 55–68 %8 January %G eng %0 Journal Article %J Signal Processing %D 2000 %T Improving the Performance of Spatial Watermarking of Images Using Channel Coding %A Juan R. Hernández %A José M. Rodríguez %A Fernando Pérez-González %K data-hiding %K watermarking %B Signal Processing %V 80 %P 1261-1279 %8 July %G eng %0 Conference Paper %B Workshop on Nonlinear Signal and Image Processing %D 1999 %T Novel Detector Structures for Watermark Extraction in the DCT Domain %A Juan R. Hernández %A Martín Amado %A Fernando Pérez-González %K data-hiding %K watermarking %B Workshop on Nonlinear Signal and Image Processing %I IEEE-EURASIP %C Antalya, Turkey %8 June %G eng %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 Conference Paper %B IEEE Annual Carnahan Conference on Security Technology %D 1999 %T A Tutorial on Digital Watermarking %A Fernando Pérez-González %A Juan R. Hernández %K data-hiding %K watermarking %B IEEE Annual Carnahan Conference on Security Technology %C Madrid, Spain %8 October %G eng %0 Conference Paper %B COST #254 Int. Workshop on Intelligent Communications %D 1998 %T Coding and Synchronization: A Boost and a Bottleneck for the Development of Image Watermarking %A Juan R. Hernández %A Fernando Pérez-González %A José M. Rodríguez %K data-hiding %K watermarking %B COST #254 Int. Workshop on Intelligent Communications %I SSGRR %C L'Aquila, Italy %P 77–82 %8 June %G eng %0 Conference Paper %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %D 1998 %T The Impact of Channel Coding on the Performance of Spatial Watermarking for Copyright Protection %A Juan R. Hernández %A Fernando Pérez-González %A José M. Rodríguez %K data-hiding %K watermarking %B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) %C Seattle, Washington, USA %V 5 %P 2973–2976 %8 May %G eng %0 Conference Paper %B COST #254 Int. Workshop on Intelligent Communications and Multimedia Terminals %D 1998 %T Improving DCT-Domain Watermark Extraction Using Generalized Gaussian Models %A Juan R. Hernández %A Fernando Pérez-González %A Martín Amado %K data-hiding %K watermarking %B COST #254 Int. Workshop on Intelligent Communications and Multimedia Terminals %C Ljubljana, Slovenia %P 23–26 %8 November %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 %0 Conference Paper %B International Workshop on Information Hiding (IH) %D 1998 %T Throwing More Light on Image Watermarks %A Juan R. Hernández %A Fernando Pérez-González %K data-hiding %K watermarking %B International Workshop on Information Hiding (IH) %S Lecture Notes in Computer Science %I Springer-Verlag %C Portland, Oregon, USA %V 1525 %P 191–207 %8 April %G eng %0 Book Section %B Intelligent methods in signal processing and communications %D 1997 %T Analysis and Synthesis Tools for Robust SPRness %A C. Mosquera %A Juan R. Hernández %A Fernando Pérez-González %E A. Figueiras %E D. Docampo %E Fernando Pérez-González %K robust %K SPR %B Intelligent methods in signal processing and communications %I Birkhauser %P 147-171 %G eng %0 Conference Paper %B Emerging Techniques for Communication Terminals %D 1997 %T Data Hiding for Copyright Protection of Still Images %A Juan R. Hernández %A Fernando Pérez-González %A José M. Rodríguez %K data-hiding %K watermarking %B Emerging Techniques for Communication Terminals %I ENSEEIHT %C Tolouse, France %P 285–289 %8 July %G eng