IEEE WIFS 2018 Best Paper Award

ER - TY - CONF T1 - Channel dependent Mutual Information in Index Modulations T2 - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing Y1 - 2018 A1 - Pol Henarejos A1 - Ana Pérez-Neira A1 - Anxo Tato A1 - Carlos Mosquera AB -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.

JF - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing ER - TY - JOUR T1 - CDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation JF - Digital Signal Processing Y1 - 2017 A1 - Fernando J. Alvarez A1 - Teodoro Aguilera A1 - R. López-Valcarce KW - compass KW - wsn AB -This paper presents an acoustic local positioning system (ALPS) suitable for indoor positioning

of portable devices such as smartphones or tablets, based on the transmission of high frequency

CDMA-coded signals from a fixed network of beacons. The main novelty of the proposed ALPS is

its capability to mitigate the effects of multipath propagation by performing an accurate estimation

of the Line-of-Sight Time-of-Flights (LOS-TOF) through the Matching Pursuit algorithm. Signal

detection, multipath cancellation and positioning estimation all take place within the portable device,

which provides a graphical representation of the updated position in less than a second. The

performance of the Matching Pursuit algorithm is analyzed in a real scenario and the results show

that the proposed method is capable to retrieve the multipath-free System Availability under strong

multipath conditions with SNR levels as low as 0 dB.

VL - 62
ER -
TY - CONF
T1 - Co-creating Security-and-Privacy-by-Design Systems
T2 - International Conference on Availability, Reliability and Security (ARES)
Y1 - 2016
A1 - Sauro Vicini
A1 - Francesco Alberti
A1 - Nicolás Notario
A1 - Alberto Crespo
A1 - Juan Ramón Troncoso-Pastoriza
A1 - Alberto Sanna
JF - International Conference on Availability, Reliability and Security (ARES)
CY - Salzburg, Germany
ER -
TY - JOUR
T1 - Compressive Covariance Sensing: Structure-Based Compressive Sensing Beyond Sparsity
JF - IEEE Signal Processing Magazine
Y1 - 2016
A1 - Daniel Romero
A1 - Dyonisius D Ariananda
A1 - Zhi Tian
A1 - Geert Leus
KW - compass
KW - compressed sensing
AB - Compressed sensing deals with the reconstruction of signals

from sub-Nyquist samples by exploiting the sparsity of their

projections onto known subspaces. In contrast, the present

article is concerned with the reconstruction of second-order

statistics, such as covariance and power spectrum, even in

the absence of sparsity priors. The framework described here

leverages the statistical structure of random processes to

enable signal compression and offers an alternative perspective

at sparsity-agnostic inference. Capitalizing on parsimonious

representations, we illustrate how compression and reconstruction

tasks can be addressed in popular applications such

as power spectrum estimation, incoherent imaging, direction

of arrival estimation, frequency estimation, and wideband

spectrum sensing.

VL - 33
IS - 1
ER -
TY - JOUR
T1 - Compression Limits for Random Vectors with Linearly Parameterized Second-Order Statistics
JF - IEEE Trans. Information Theory
Y1 - 2015
A1 - Daniel Romero
A1 - R. López-Valcarce
A1 - Geert Leus
KW - compass
KW - compressed sensing
AB - The class of complex random vectors whose covariance

matrix is linearly parameterized by a basis of Hermitian

Toeplitz (HT) matrices is considered, and the maximum

compression ratios that preserve all second-order information

are derived — the statistics of the uncompressed vector must

be recoverable from a set of linearly compressed observations.

This kind of vectors arises naturally when sampling widesense

stationary random processes and features a number of

applications in signal and array processing.

Explicit guidelines to design optimal and nearly optimal

schemes operating both in a periodic and non-periodic fashion

are provided by considering two of the most common linear

compression schemes, which we classify as dense or sparse. It

is seen that the maximum compression ratios depend on the

structure of the HT subspace containing the covariance matrix of

the uncompressed observations. Compression patterns attaining

these maximum ratios are found for the case without structure as

well as for the cases with circulant or banded structure. Universal

samplers are also proposed to compress unknown HT subspaces.

VL - 61
IS - 3
ER -
TY - JOUR
T1 - Cramér-Rao Bounds for SNR Estimation of Oversampled Linearly Modulated Signals
JF - IEEE Trans. Signal Processing
Y1 - 2015
A1 - R. López-Valcarce
A1 - J. Villares
A1 - J. Riba
A1 - W. Gappmair
A1 - C. Mosquera
KW - adaptive signal processing
KW - compass
KW - Cramér-Rao bound (CRB)
KW - dynacs
KW - oversampling
KW - Signal-to-noise ratio (SNR)
AB - Most Signal-to-noise ratio (SNR) estimators use the

receiver matched filter output sampled at the symbol rate, an

approach which does not preserve all information in the analog

waveform due to aliasing. Thus, it is relevant to ask whether

avoiding aliasing could improve SNR estimation. To this end, we

compute the corresponding data-aided (DA) and non-data-aided

(NDA) Cramér-Rao bounds (CRBs). We adopt a novel dual filter

framework, which is shown to be information-preserving under

suitable conditions and considerably simplifies the analysis. It is

shown that the CRB can be substantially reduced by exploiting

any available excess bandwidth, depending on the modulation

scheme, the SNR range, and the estimator (DA or NDA) type.

VL - 63
IS - 7
ER -
TY - CONF
T1 - Channel estimation in millimeter wave MIMO systems with one-bit quantization
T2 - Asilomar Conf. on Signals, Systems and Computers
Y1 - 2014
A1 - Jianhua Mo
A1 - Phil Schniter
A1 - Nuria González-Prelcic
A1 - Robert W. Heath Jr.
KW - adaptive signal processing
KW - compass
KW - mmWave
JF - Asilomar Conf. on Signals, Systems and Computers
ER -
TY - CONF
T1 - Circular Sparse Rulers Based On Co-prime Sampling For Compressive Power Spectrum Estimation
T2 - IEEE Global Communications Conference
Y1 - 2014
A1 - Nuria González-Prelcic
A1 - M. E. Domíngez-Jiménez
KW - cognitive radio
KW - compass
KW - compressed sensing
JF - IEEE Global Communications Conference
PB - IEEE
CY - Austin, TX
ER -
TY - THES
T1 - Cognitive and Signal Processing Techniques for Improved Spectrum Exploitation in Wireless Communications
Y1 - 2014
A1 - Alberto Rico-Alvariño
KW - cognitive radio
KW - satcom
PB - Universidade de Vigo
CY - Vigo
ER -
TY - CONF
T1 - Cooperative compressive power spectrum estimation
T2 - IEEE Sensor Array Multichannel Signal Process. Workshop (SAM)
Y1 - 2014
A1 - Dyonisius D Ariananda
A1 - Daniel Romero
A1 - Geert Leus
KW - cognitive radio
KW - wsn
JF - IEEE Sensor Array Multichannel Signal Process. Workshop (SAM)
ER -
TY - CONF
T1 - Cancelling self-interference in full-duplex relays without Angle-of-Arrival information
T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP)
Y1 - 2013
A1 - Emilio Antonio-Rodríguez
A1 - R. López-Valcarce
KW - adaptive signal processing
KW - dynacs
KW - full duplex
AB - With full-duplex relays, simultaneous reception and transmission in

the same frequency produce self-interference distortion and relay oscillation,

hampering reception at the receiver end unless properly

mitigated. Previous adaptive methods for self-interference cancellation

using multiple receive antennas require knowledge of the direction

of arrival of the source signal. We present a novel architecture

and adaptive scheme for Amplify-and-Forward relays allowing cancellation

without such knowledge. The temporal filter is updated

under the property restoral paradigm in order to match the power

spectrum of the retransmitted signal to that of the source signal.

JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP)
ER -
TY - JOUR
T1 - Choose Your Subcarriers Wisely: Active Interference Cancellation for Cognitive OFDM
JF - IEEE Journal on Emerging and Selected Topics in Circuits and Systems
Y1 - 2013
A1 - Schmidt, J.F.
A1 - Costas-Sanz, S.
A1 - R. López-Valcarce
KW - cognitive radio
KW - dynacs
KW - spectrum shaping
VL - 3
IS - 4
ER -
TY - CONF
T1 - A Class of Circular Sparse Rulers for Compressive Power Spectrum Estimation
T2 - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco)
Y1 - 2013
A1 - M. Elena Domínguez-Jiménez
A1 - Nuria González-Prelcic
KW - cognitive radio
KW - dynacs
JF - European Signal Processing Conf. (EUSIPCO), Marrakech (Morocco)
ER -
TY - JOUR
T1 - A Cognitive Mobile BTS Solution with Software-Defined Radioelectric Sensing
JF - Sensors
Y1 - 2013
A1 - J. Muñoz
A1 - J. Vales-Alonso
A1 - F. Quiñoy-García
A1 - Costas-Sanz, S.
A1 - M. Pillado
A1 - F.J. González-Castaño
A1 - M. García-Sanchez
A1 - R. López-Valcarce
A1 - C. López-Bravo
KW - cognitive radio
KW - dynacs
KW - mobile communications
KW - SDR
KW - vehicular communications
AB - Private communications inside large vehicles such as ships may be effectively provided using standard cellular systems. In this paper we propose a new solution based on software-defined radio with electromagnetic sensing support. Software-defined radio allows low-cost developments and, potentially, added-value services not available in commercial cellular networks. The platform of reference, OpenBTS, only supports single-channel cells. Our proposal, however, has the ability of changing BTS channel frequency without disrupting ongoing communications. This ability should be mandatory in vehicular environments, where neighbouring cell configurations may change rapidly, so a moving cell must be reconfigured in real-time to avoid interferences. Full details about frequency occupancy sensing and the channel reselection procedure are provided in this paper. Moreover, a procedure for fast terminal detection is proposed. This may be decisive in emergency situations, e.g., if someone falls overboard. Different tests confirm the feasibility of our proposal and its compatibility with commercial GSM terminals.

VL - 13 IS - 2 ER - TY - CONF T1 - Compressive Angular and Frequency Periodogram Reconstruction for Multiband Signals T2 - IEEE Int. Workshop Comput. Advances Multi-Sensor Adaptive Process (CAMSAP) Y1 - 2013 A1 - Ariananda, D. D. A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - dynacs JF - IEEE Int. Workshop Comput. Advances Multi-Sensor Adaptive Process (CAMSAP) CY - San Martin ER - TY - CONF T1 - Compressive Covariance Sampling T2 - Inform. Theory Appl. Workshop Y1 - 2013 A1 - Daniel Romero A1 - Geert Leus KW - cognitive radio KW - dynacs JF - Inform. Theory Appl. Workshop ER - TY - CONF T1 - Compressive wideband spectrum sensing with spectral prior information T2 - Int. Conf. Acoust., Speech, Signal Process. (ICASSP) Y1 - 2013 A1 - Daniel Romero A1 - R. López-Valcarce A1 - Geert Leus KW - cognitive radio KW - dynacs KW - spectrum sensing AB -Wideband spectrum sensing provides a means to determine

the occupancy of channels spanning a broad range of frequencies.

Practical limitations impose that the acquisition should

be accomplished at a low rate, much below the Nyquist lower

bound. Dramatic rate reductions can be obtained by the observation

that only a few parameters need to be estimated in

typical spectrum sensing applications. This paper discusses

the joint estimation of the power of a number of channels,

whose power spectral density (PSD) is known up to a scale

factor, using compressive measurements. First, relying on

a Gaussian assumption, an efficient approximate maximum

likelihood (ML) technique is presented. Next, a least-squares

estimator is applied for the general non-Gaussian case.

JF - Int. Conf. Acoust., Speech, Signal Process. (ICASSP)
ER -
TY - CONF
T1 - Coping with the enemy: Advances in adversary-aware signal processing
T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Y1 - 2013
A1 - Mauro Barni
A1 - Fernando Pérez-González
JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
CY - Vancouver, Canada
UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6639361
ER -
TY - Generic
T1 - Cross Layer Link Adaptation in Time Varying Mobile Satellite Channels with Statistical and Outdated CSIT
T2 - Asilomar Conference on Signals Systems and Computers
Y1 - 2013
A1 - Alberto Rico-Alvariño
A1 - J. Arnau
A1 - Carlos Mosquera
KW - dynacs
KW - satcom
JF - Asilomar Conference on Signals Systems and Computers
ER -
TY - CONF
T1 - On the Co-existence of Primary and Secondary Transmitters in a Broadcast Network
T2 - International Conference on Cognitive Radio and Advanced Spectrum Management
Y1 - 2011
A1 - Alberto Rico-Alvariño
A1 - C. Mosquera
A1 - Fernando Pérez-González
KW - Broadcast
KW - cognitive radio
KW - Overlay
KW - Single Frequency Network
JF - International Conference on Cognitive Radio and Advanced Spectrum Management
CY - Barcelona, Catalonia, Spain
ER -
TY - JOUR
T1 - Closed-form real single-tone frequency estimator based on a normalized IIR notch filter
JF - Signal Processing
Y1 - 2010
A1 - R. Elasmi-Ksibi
A1 - S. Cherif
A1 - R. López-Valcarce
A1 - H. Besbes
KW - Frequency estimation
KW - IIR notchfilter
KW - Least squares
KW - Real sinusoid
KW - RPHD estimator
VL - 90
ER -
TY - CONF
T1 - CryptoDSPs for Cloud Privacy
T2 - International Workshop on Cloud Information System Engineering (CISE)
Y1 - 2010
A1 - Juan Ramón Troncoso-Pastoriza
A1 - Fernando Pérez-González
KW - cloud
KW - privacy
KW - security
KW - watermarking
JF - International Workshop on Cloud Information System Engineering (CISE)
T3 - LNCS
CY - Hong Kong, China
VL - 6724
ER -
TY - JOUR
T1 - Cramer-Rao Lower Bound and EM Algorithm for Envelope-Based SNR Estimation of Nonconstant Modulus Constellations
JF - IEEE Transactions on Communications
Y1 - 2009
A1 - Wilfried Gappmair
A1 - R. López-Valcarce
A1 - C. Mosquera
VL - 57
ER -
TY - CONF
T1 - On the capacity of stegosystems
T2 - ACM Workshop on Multimedia and Security (MMSEC)
Y1 - 2007
A1 - Pedro Comesaña
A1 - Fernando Pérez-González
KW - data-hiding
KW - steganography
KW - watermarking
JF - ACM Workshop on Multimedia and Security (MMSEC)
CY - Dallas, TX, USA
ER -
TY - BOOK
T1 - Comunicaciones Digitales
Y1 - 2007
A1 - Antonio Artés-Rodríguez
A1 - Fernando Pérez-González
A1 - Jesús Cid-Sueiro
A1 - R. López-Valcarce
A1 - C. Mosquera
A1 - Fernando Pérez-Cruz
PB - Pearson - Prentice Hall
ER -
TY - JOUR
T1 - Cost minimisation interpretation of fourth power phase estimator and links to multimodulus algorithm
JF - IEE Electronics Letters
Y1 - 2004
A1 - R. López-Valcarce
KW - constant modulus
KW - Digital Communications
KW - equalization
KW - multimodulus
KW - phase estimation
VL - 40
ER -
TY - CONF
T1 - Characterization of the Railroad Satellite Channel within the FIFTH Project
T2 - IST Mobile & Wireless Communications Summit
Y1 - 2003
A1 - Sandro Scalise
A1 - Marcos Álvarez-Díaz
A1 - Giorgio Sciascia
A1 - Rodolfo Mura
KW - Digital Communications
KW - satellite communications
JF - IST Mobile & Wireless Communications Summit
CY - Aveiro, Portugal
ER -
TY - CONF
T1 - Channel equalization with staggered modulation formats
T2 - IEEE International Conference on Digital Signal Processing (DSP)
Y1 - 2002
A1 - R. López-Valcarce
KW - Digital Communications
KW - equalization
KW - staggered modulation
JF - IEEE International Conference on Digital Signal Processing (DSP)
CY - Santorini, Greece
ER -
TY - CONF
T1 - A Channel Model for the Galician Low Voltage Main Network
T2 - International Symposium on Power Line Communications and Its Applications (ISPLC)
Y1 - 2001
A1 - Nuria González-Prelcic
A1 - C. Mosquera
A1 - Norberto Degara-Quintela
A1 - A. Currais
JF - International Symposium on Power Line Communications and Its Applications (ISPLC)
CY - Malmo, Sweden
ER -
TY - CONF
T1 - Coding at the Sample Level for Data Hiding: Turbo and Concatenated Codes
T2 - Security and Watermarking of Multimedia Contents
Y1 - 2001
A1 - Félix Balado
A1 - Fernando Pérez-González
ED - Ping W. Wong
ED - Edward J. Delp
KW - data-hiding
KW - watermarking
JF - Security and Watermarking of Multimedia Contents
T3 - Proc. of SPIE
CY - San José, USA
VL - 4314
ER -
TY - JOUR
T1 - Convergence analysis of the multiple-channel filtered-U recursive LMS algorithm for active noise control
JF - Signal Processing
Y1 - 2000
A1 - C. Mosquera
A1 - Fernando Pérez-González
KW - ANC
KW - FuRLMS
KW - SPR
VL - 80
ER -
TY - CONF
T1 - Coding and Synchronization: A Boost and a Bottleneck for the Development of Image Watermarking
T2 - COST #254 Int. Workshop on Intelligent Communications
Y1 - 1998
A1 - Juan R. Hernández
A1 - Fernando Pérez-González
A1 - José M. Rodríguez
KW - data-hiding
KW - watermarking
JF - COST #254 Int. Workshop on Intelligent Communications
PB - SSGRR
CY - L'Aquila, Italy
ER -
TY - CONF
T1 - Characterization and Algebraic Solution to the Extreme-Point Robust SPR Problem
T2 - IFAC World Congress
Y1 - 1996
A1 - Fernando Pérez-González
A1 - C. Mosquera
KW - robust
KW - SPR
JF - IFAC World Congress
CY - San Francisco, CA, USA
ER -
TY - JOUR
T1 - A comparison of system architectures for intelligent document understanding
JF - Signal Processing: Image Communication
Y1 - 1996
A1 - G. S. D. Farrow
A1 - C. S. Xydeas
A1 - J.P. Oakley
A1 - A. Khorabi
A1 - Nuria González-Prelcic
VL - 9
ER -
TY - CONF
T1 - Considerations on the Performance of Filter Design Methods for Wavelet Packet Audio Decompositions
T2 - Audio Engineering Society Convention (AES Convention)
Y1 - 1996
A1 - Nuria González-Prelcic
A1 - S. González-Sánchez
A1 - Antonio S. Pena
JF - Audio Engineering Society Convention (AES Convention)
CY - Copenhagen, Denmark
N1 - Preprint 4235
ER -