Département signal et communications

%0 Journal Article
%T Rafting behaviour of seabirds as a proxy to describe surface ocean currents in the Balearic Sea
%+ Lab-STICC_IMTA_CID_TOMS
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ Miquel Marques, 21
%+ Laboratoire de Chimie des Polymères Organiques (LCPO)
%A Sánchez-Román, A.
%A Gómez-Navarro, L.
%A Fablet, Ronan
%A Oro, D.
%A Mason, E.
%A Arcos, J.
%A Ruiz, S.
%A Pascual, A.
%< avec comité de lecture
%@ 2045-2322
%J Scientific Reports
%I Nature Publishing Group
%V 9
%N 1
%8 2019-12
%D 2019
%Z Environmental Sciences/Biodiversity and Ecology
%Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles
%G English
%L hal-02005270
%U https://hal-imt-atlantique.archives-ouvertes.fr/hal-02005270
%~ IMT-ATLANTIQUE
%~ CNRS
%~ UNIV-BREST
%~ UNIV-UBS
%~ SDE
%~ INSTITUT-TELECOM
%~ ENIB
%~ LAB-STICC
%~ GIP-BE
%~ INC-CNRS
%~ LAB-STICC_IMTA_CID_TOMS
%~ LAB-STICC_IMTA
%~ IMTA_SC
%~ PRACOM

%0 Journal Article
%T Reconstruction of Finite-Alphabet Block-Sparse Signals from MAP Support Detection
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC)
%+ Lab-STICC_IMTA_CACS_COM
%A Messai, Malek
%A Amis Cavalec, Karine
%A Guilloud, Frédéric
%A Aissa El Bey, Abdeldjalil
%< avec comité de lecture
%Z 19619
%@ 2169-3536
%J IEEE access
%V 7
%N 1
%P 57996 - 58009
%8 2019-12
%D 2019
%R 10.1109/ACCESS.2019.2914349
%K Compressed sensing
%K Finite alphabet signals
%K Support detection
%K Orthogonal matching pursuit
%K Gaussian mixture model
%Z Engineering Sciences [physics]/Signal and Image processingJournal articles
%X This paper addresses finite-alphabet block-sparse signal recovery by considering support detection and data estimation separately. To this aim, we propose a maximum a posteriori (MAP) support detection criterion that takes into account the finite alphabet of the signal as a constraint. We then incorporate the MAP criterion in a compressed sensing detector based on a greedy algorithm for support estimation. We also propose to consider the finite-alphabet property of the signal in the bound-constrained least-squares optimization algorithm for data estimation. The MAP support detection criterion is investigated in two different contexts: independent linear modulation symbols and dependent binary Continous Phase Modulation (CPM) symbols. Simulations are carried out in the context of sporadic multiuser communications and show the efficiency of proposed algorithms compared to selected state-of-the-art algorithms both in terms of support detection and data estimation.
%G English
%L hal-02118879
%U https://hal.archives-ouvertes.fr/hal-02118879
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CACS_COM
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Journal Article
%T Two dimensional CCA via penalized matrix decomposition for structure preserved fMRI data analysis
%+ Department of Electrical and Electronic Engineering [Melbourne]
%+ Lab-STICC_IMTA_CACS_COM
%+ Département Signal et Communications (IMT Atlantique - SC)
%A Qadar, Muhammad Ali
%A Aissa El Bey, Abdeldjalil
%A Seghouane, Abd-Krim
%< avec comité de lecture
%Z 19621
%@ 1051-2004
%J Digital Signal Processing
%I Elsevier
%V 92
%P 36 - 46
%8 2019-09
%D 2019
%R 10.1016/j.dsp.2019.04.010
%K Canonical correlation analysis
%K Functional magnetic resonance imaging
%K Sparse decomposition
%K Rank-1 approximation
%Z Engineering Sciences [physics]/Signal and Image processingJournal articles
%X Two dimensional canonical correlation analysis (2DCCA) is a data driven method that has been used to preserve the local spatial structure of functional magnetic resonance (fMR) images and to detect brain activation patterns. 2DCCA finds pairs of left and right linear transforms by directly operating on two dimensional data (i.e., image data) such that the correlation between their projections is maximized without neglecting the local spatial structure of the data. However, in the context of high dimensional data, the performance of 2DCCA suffers from interpretability of learned projection variables. In this study, to improve the interpretability of projection variables while preserving the local spatial structure of fMR images, we propose two new 2DCCA approaches, sparse 2DCCA and regularized 2DCCA. The proposed algorithms aim at improving the activation detection performance in terms of specificity of activated voxels by directly operating on image data without rearranging fMRI slices in 1D-vectors. The validity of the proposed algorithms has been evaluated on synthetic and real fMRI datasets and it has been shown that the proposed algorithms produce activation maps with higher specificity of activated voxels compared with CCA, 2DCCA, and existing sparse 2DCCA (S2DCCA).
%G English
%L hal-02124926
%U https://hal.archives-ouvertes.fr/hal-02124926
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CACS_COM
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Conference Proceedings
%T Investigation of hybrid ARQ performance for HSDPA over block fading channel
%+ Ecole Nationale d'Ingénieurs de Tunis (ENIT)
%+ Lab-STICC_IMTA_CACS_COM
%+ Département Signal et Communications (SC)
%A Hakimi, Walid
%A Ammar, Mahmoud
%A Saoudi, Samir
%A BOUALLEGUE, Ammar
%< avec comité de lecture
%Z 5605
%( Proceedings ISIVC'08 : 4th IEEE International Symposium on Image/Video Communications, July 9-11, Bilbao, Spain
%B ISIVC'08 : 4th IEEE International Symposium on Image/Video Communications, July 9-11, Bilbao, Spain
%C Bilbao, Spain
%P .
%8 2019-07-09
%D 2019
%K Hybrid ARQ
%K HSDPA
%Z Engineering Sciences [physics]/Signal and Image processingConference papers
%X Investigation of hybrid ARQ performance for HSDPA over block fading channel
%G English
%L hal-02119144
%U https://hal.archives-ouvertes.fr/hal-02119144
%~ INSTITUT-TELECOM
%~ TELECOM-BRETAGNE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CACS_COM
%~ IMTA_SC
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Journal Article
%T Hyperspectral Image Unmixing with Endmember Bundles and Group Sparsity Inducing Mixed Norms
%+ Lab-STICC_IMTA_CID_TOMS
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ SmartKYC Ltd
%+ University of Iceland [Reykjavik]
%+ SIGMAPHY (GIPSA-SIGMAPHY)
%+ Department of Mathematics [UCLA]
%+ VIBS (GIPSA-VIBS)
%A Drumetz, Lucas
%A Meyer, Travis
%A Chanussot, Jocelyn
%A Bertozzi, Andrea
%A Jutten, Christian
%< avec comité de lecture
%@ 1057-7149
%J IEEE Transactions on Image Processing
%I Institute of Electrical and Electronics Engineers
%V 28
%N 7
%P 3435-3450
%8 2019-07
%D 2019
%R 10.1109/TIP.2019.2897254
%K convex optimization
%K Hyperspectral imaging
%K remote sensing
%K spectral unmixing
%K endmember variability
%K group sparsity
%Z Engineering Sciences [physics]/Signal and Image processingJournal articles
%X Hyperspectral images provide much more information than conventional imaging techniques, allowing a precise identification of the materials in the observed scene, but because of the limited spatial resolution, the observations are usually mixtures of the contributions of several materials. The spectral unmixing problem aims at recovering the spectra of the pure materials of the scene (endmembers), along with their proportions (abundances) in each pixel. In order to deal with the intra-class variability of the materials and the induced spectral variability of the endmembers, several spectra per material, constituting endmember bundles, can be considered. However, the usual abundance estimation techniques do not take advantage of the particular structure of these bundles, organized into groups of spectra. In this paper, we propose to use group sparsity by introducing mixed norms in the abundance estimation optimization problem. In particular, we propose a new penalty which simultaneously enforces group and within group sparsity, to the cost of being nonconvex. All the proposed penalties are compatible with the abundance sum-to-one constraint, which is not the case with traditional sparse regression. We show on simulated and real datasets that well chosen penalties can significantly improve the unmixing performance compared to classical sparse regression techniques or to the naive bundle approach.
%G English
%2 https://hal-imt-atlantique.archives-ouvertes.fr/hal-02138874/document
%2 https://hal-imt-atlantique.archives-ouvertes.fr/hal-02138874/file/drumetz_tip_2019_final_bios.pdf
%L hal-02138874
%U https://hal-imt-atlantique.archives-ouvertes.fr/hal-02138874
%~ IMT-ATLANTIQUE
%~ UNIV-GRENOBLE1
%~ UNIV-PMF_GRENOBLE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ GIPSA-VIBS
%~ CNRS
%~ UNIV-GRENOBLE3
%~ UGA-TEST-QUATER
%~ INPG
%~ UGA-TEST-BIS
%~ LAB-STICC_IMTA_CID_TOMS
%~ LAB-STICC_IMTA
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM
%~ GIPSA
%~ UGA
%~ GIPSA-DIS
%~ GIPSA-SIGMAPHY

%0 Conference Paper
%F Oral
%T Optimal TAS for Cross-Interference Mitigation in Cognitive MIMO MRC Systems
%+ Lab-STICC_TB_CACS_COM
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ Lab-STICC_IMTA_CACS_COM
%+ IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)
%+ Department of Systems and Computer Engineering, Carleton University, Ottawa, Canada (Carleton University)
%A El-Moutaouakkil, Zakaria
%A Tourki, Kamel
%A Saoudi, Samir
%A Yanikomeroglu, Halim
%< avec comité de lecture
%B 15th International Wireless Communications & Mobile Computing Conference
%C Tanger, Morocco
%8 2019-06-24
%D 2019
%K Index Terms-cognitive MIMO
%K spectrum sharing
%K primary system
%K secondary system
%K TAS
%K SINR
%K MRC
%K interference con- straint
%K outage performance
%K Monte-Carlo simulations
%Z Engineering Sciences [physics]
%Z Engineering Sciences [physics]/AutomaticConference papers
%X In a cost-effective implementation, we address the problem of cross-interference in cognitive multiple-input multiple-output (MIMO) spectrum sharing where mutual co-channel interference (CCI) between the primary and secondary systems is of major concern. First, we propose an optimal transmit-antenna selection (TAS) strategy that instead maximizes the received signal-to-interference-plus-noise ratio (SINR) after maximum-ratio combining (MRC). We statistically analyze the combined SINR structure and derive new expressions of its cumulative and probability distribution functions. Interestingly, we accurately show the substantial gains offered by the proposed TAS strategy in terms of the secondary system outage performance compared to the existent state-of-the-art TAS strategies. Finally, our analytical results are validated by simulations and some important insights are also underlined.
%G English
%2 https://hal-imt-atlantique.archives-ouvertes.fr/hal-02117370/document
%2 https://hal-imt-atlantique.archives-ouvertes.fr/hal-02117370/file/IWCMC19.pdf
%L hal-02117370
%U https://hal-imt-atlantique.archives-ouvertes.fr/hal-02117370
%~ IMT-ATLANTIQUE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC_ENIB
%~ LAB-STICC
%~ CNRS
%~ LAB-STICC_TB
%~ LAB-STICC_IMTA
%~ LAB-STICC_IMTA_CACS_COM
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM

%0 Conference Proceedings
%T On the furtivity of signals used in Oceanic Acoustic Tomography experiments
%+ Département Signal et Communications (SC)
%+ Lab-STICC_IMTA_CID_TOMS
%A Rabaste, Olivier
%A Chonavel, Thierry
%< avec comité de lecture
%Z 1596
%( Actes Oceans'05 Europe - Brest - France - juin 2005
%B Oceans'05 Europe - Brest - France - juin 2005
%C Brest, France
%P .
%8 2019-06-20
%D 2019
%K Acoustic signals
%Z Engineering Sciences [physics]/Signal and Image processingConference papers
%X In this paper, the furtivity of acoustic signals commonly used in oceanic acoustic tomography experiments is addressed. Three kinds of detectors are presented that can be used by an outsider to detect either unknown signals or signals showing the main characteristics of common tomographic signals. In the first case, the detector decision statistic is based on the signals energy, whereas in the second case it exploits either cyclostationarity properties of the signals or their time-frequency characteristics. Performance of these detectors on signals transmitted through a multipath underwater channel is studied.
%G French
%L hal-02125249
%U https://hal.archives-ouvertes.fr/hal-02125249
%~ INSTITUT-TELECOM
%~ TELECOM-BRETAGNE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CID_TOMS
%~ IMTA_SC
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Journal Article
%T Trade-off between Frame Synchronization and Channel Decoding for Short Packets
%+ Lab-STICC_IMTA_CACS_COM
%+ Département Signal et Communications (IMT Atlantique - SC)
%A Nguyen, Alex The Phuong
%A Le Bidan, Raphaël
%A Guilloud, Frédéric
%< avec comité de lecture
%@ 1089-7798
%J IEEE Communications Letters
%I Institute of Electrical and Electronics Engineers
%V 23
%N 6
%P 979-982
%8 2019-06-01
%D 2019
%R 10.1109/LCOMM.2019.2913363
%K 5G NR
%K MMTC
%K Urllc
%K Frame synchronization
%K Finite blocklength
%K Short-packet transmissions
%Z Engineering Sciences [physics]/Signal and Image processingJournal articles
%X We consider the transmission of successive packets where each packet consists of a frame synchronization word (SW), followed by coded symbols. For short packets the header cost is no longer negligible and SW design requires careful optimization. In particular, a trade-off arises depending on the way the total transmit power is split among the SW and the codeword. Assuming optimal finite-length codes, we develop tight approximations on the probability of false synchronization for several synchronization metrics and use them to characterize this trade-off. Simulation results and comparisons with 5G Polar codes show the relevance of the proposed optimization for short-packet communication system design.
%G English
%L hal-02132628
%U https://hal-imt-atlantique.archives-ouvertes.fr/hal-02132628
%~ IMT-ATLANTIQUE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ LAB-STICC_IMTA
%~ LAB-STICC_IMTA_CACS_COM
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM

%0 Conference Proceedings
%T adaptive blind sparse source separation Based on Shear and Givens Rotations
%+ Lab-STICC_IMTA_CACS_COM
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME)
%A Lassami, Nacerredine
%A Aissa El Bey, Abdeldjalil
%A Abed-Meraim, Karim
%< avec comité de lecture
%Z 19585
%( Proceedings IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
%B IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
%C Brighton, United Kingdom
%P 4225 - 4229
%8 2019-05-12
%D 2019
%R 10.1109/ICASSP.2019.8683276
%K Blind source separation
%K Sparse signals
%K Adaptive algorithm
%K Shear and Givens rotations
%Z Engineering Sciences [physics]/Signal and Image processingConference papers
%X This paper addresses the problem of adaptive blind sparse source separation in the time domain of an over-determined instantaneous noisy mixture. A two-step approach is proposed: first, the data are projected on the signal subspace estimated using the principal subspace tracker FAPI. In the second step, an L1 criterion is used to represent the sparsity property of the signal sources. For the optimization of this cost function, an adaptive method based on Givens and Shear rotations is used. This algorithm, referred to SGDS-FAPI, guarantees low computational complexity which is essential in the adaptive context. Numerical simulations have been performed, and showed that the proposed algorithm outperforms existing solutions in both convergence speed and estimation quality.
%G English
%L hal-02059638
%U https://hal.archives-ouvertes.fr/hal-02059638
%~ INSTITUT-TELECOM
%~ TELECOM-BRETAGNE
%~ CNRS
%~ UNIV-BREST
%~ UNIV-UBS
%~ MSL
%~ MSL-THESE
%~ ENIB
%~ LAB-STICC
%~ UNIV-ORLEANS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CACS_COM
%~ PRISME-CVL
%~ IMTA_SC
%~ LAB-STICC_IMTA
%~ PRACOM
%~ ENSI-BOURGES

%0 Journal Article
%T Hyperspectral Classification Through Unmixing Abundance Maps Addressing Spectral Variability
%+ University of Las Palmas de Gran Canaria (ULPGC)
%+ Département Signal et Communications (IMT Atlantique - SC)
%+ Lab-STICC_IMTA_CID_TOMS
%+ Universidad Politécnica de Madrid (UPM)
%+ SIGMAPHY (GIPSA-SIGMAPHY)
%A Ibarrola-Ulzurrun, Edurne
%A Drumetz, Lucas
%A Marcello, Javier
%A Gonzalo-Martin, Consuelo
%A Chanussot, Jocelyn
%< avec comité de lecture
%@ 0196-2892
%J IEEE Transactions on Geoscience and Remote Sensing
%I Institute of Electrical and Electronics Engineers
%P 1-14
%8 2019-05-01
%D 2019
%R 10.1109/TGRS.2019.2892903
%Z Engineering Sciences [physics]/Signal and Image processingJournal articles
%G English
%L hal-02138883
%U https://hal-imt-atlantique.archives-ouvertes.fr/hal-02138883
%~ IMT-ATLANTIQUE
%~ UNIV-GRENOBLE1
%~ UNIV-PMF_GRENOBLE
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ UNIV-GRENOBLE3
%~ UGA-TEST-QUATER
%~ INPG
%~ UGA-TEST-BIS
%~ LAB-STICC_IMTA_CID_TOMS
%~ LAB-STICC_IMTA
%~ IMTA_SC
%~ INSTITUT-TELECOM
%~ PRACOM
%~ UGA
%~ GIPSA
%~ GIPSA-DIS
%~ GIPSA-SIGMAPHY