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21 results on '"Thameri, Messaoud"'

1. Exact Conditional and Unconditional Cram\`er-Rao Bounds for Near Field Localization

Author

Begriche, Youcef, Thameri, Messaoud, and Abed-Meraim, Karim

Subjects
Computer Science - Computational Engineering, Finance, and Science
Abstract

This paper considers the Cram\`er-Rao lower Bound (CRB) for the source localization problem in the near field. More specifically, we use the exact expression of the delay parameter for the CRB derivation and show how this exact CRB can be significantly different from the one given in the literature and based on an approximate time delay expression (usually considered in the Fresnel region). This CRB derivation is then generalized by considering the exact expression of the received power profile (i.e., variable gain case) which, to our best knowledge, has been ignored in the literature. Finally, we exploit the CRB expression to introduce the new concept of Near Field Localization (NFL) region for a target localization performance associated to the application at hand. We illustrate the usefulness of the proposed CRB derivation and its developments as well as the NFL region concept through numerical simulations in different scenarios.

Published
2013

9. Multiple objective optimization Applied to Speech enhancement problem.

Author

Ouznadji, Said, Chaabane, Djamal, and Thameri, Messaoud

Abstract

Enhancement of speech corrupted by broadband noise is subject of interest in many applications. For several years, the investigation of methods of denoising the vocal signal has yielded very satisfactory results, but certain problems and questions still remain. The term speech quality in speech enhancement is associated with clarity and intelligibility. So, one of these issues is to reach a compromise between noise reduction, signal distortion and musical noise. In this paper, we studied one of the classical techniques based on the spectral subtraction developed by Boll and improved by Berouti where two parameters α and β to control the effects of the distortion and the musical noise are introduced. However, the choice on these parameters (α and β) remains empirical. Our works is to find a compromise between these two parameters to obtain an optimal solution depending on the environment, the unknown noise and its level. Moreover, we propose in this paper, an algorithm based on bi-objective approach precisely Particle Swarm Optimization (PSO) technique in association with speech enhancement technique proposed by Berouti et al. Comparative results show that the performance of our proposed method with several types of noise, depending on the environment and on various noise levels, are better than those of spectral subtraction methods of Boll or Berouti. [ABSTRACT FROM AUTHOR]

Published
2020
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10. On the Statistical Resolution Limit (SRL) for Time-Reversal based MIMO radar Signal Processing

Author

Thameri, Messaoud, Abed-Meraim, Karim, Foroozan, Foroohar, Boyer, Remy, Asif, Amir, Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), and Abed-Meraim, Karim

Subjects
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

12. Robust subspace tracking in impulsive noise environment

Author

Thameri, Messaoud, Abed-Meraim, Karim, Belouchrani, Adel, Département Traitement du Signal et des Images (TSI), Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Ecole Nationale Polytechnique [Alger] (ENP), and Abed-Meraim, Karim

Subjects
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

14. Résolution limite pour un radar MIMO fonctionnant en mode de retournement temporel

Author

Thameri, Messaoud, Boyer, Rémy, Abed-Meraim, Karim, Foroozan, Foroohar, Département Traitement du Signal et des Images (TSI), Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME), Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges)-Université d'Orléans (UO), York University [Toronto], and Université d'Orléans (UO)-Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges)

Subjects
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; L'un des outils de statistique pour évaluer les performance des estimateurs est le Seuil de Résolution Limite (SRL). Ce dernier est défini comme étant la distance minimale nécessaire pour pouvoir résoudre deux paramètres ou sources. Dans cet article, nous abordons le problème du seuil de résolution angulaire limite en développant ses expressions analytiques pour un radar MIMO actif fonctionnant en mode de retournement temporel.

Published
2014

15. Etude des performances limites en résolution pour le Radar MIMO actif fonctionnant en mode retournement temporel : SINR seuil et résolution limite

Author

Thameri, Messaoud, Boyer, Remy, Abed-Meraim, Karim, Laboratoire Traitement et Communication de l'Information (LTCI), Télécom ParisTech-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME), Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges)-Université d'Orléans (UO), and Boyer, Remy

Subjects
[SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics]
Published
2013

16. ROBUST SUBSPACE TRACKING IN ALPHA-STABLE NOISE ENVIRONMENTS

Author

Thameri, Messaoud, Abed-Meraim, Karim, Belouchrani, A., Signal, Statistique et Apprentissage (S2A), Laboratoire Traitement et Communication de l'Information (LTCI), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris-Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, Département Traitement du Signal et des Images (TSI), Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS), and HAL, TelecomParis

Subjects
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, ComputingMilieux_MISCELLANEOUS, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience

Published
2013

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