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Auteur Atef Farrouki |
Documents disponibles écrits par cet auteur (6)
Affiner la recherche Interroger des sources externesDétection CFAR de cibles réparties dans un clutter K-distribué de paramètres inconnus / Nabila Nouar
Titre : Détection CFAR de cibles réparties dans un clutter K-distribué de paramètres inconnus Type de document : texte imprimé Auteurs : Nabila Nouar, Auteur ; Atef Farrouki, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 96 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : MSD Détection CFAR distribution-k estimation des paramètres CFAR detection k-distribution parameters estimation كشف CFAR تشويش من نوع K تقدير المعاملات Index. décimale : 621 Electronique Résumé : In high resolution radars (HRR), unlike point-target model, targets are described as a reflection from isolated points, referred to as MDS (Multiple Dominant Scattering).
In this work, we consider the detection of spatially distributed targets (MDS model) embedded in K-distributed clutter with a partially correlated texture, and without any a priori knowledge about the clutter parameters.
To this end, we propose a new detection approach, based on the Cell-Averaging (CA) scheme, using Look up Tables (LT), which contain the pre-computed thresholding factors that maintain a constant false alarm rate.
The parameters of the K-distribution are estimated, in order to assign to the threshold its appropriate value according to the actual environment.
The performances of the proposed detector were analyzed and compared to those of the Logarithmic-based Cell Averaging detector (CAL), for different shape and scale parameters and correlation degrees.
The simulation results showed that the proposed detector (CA-LT) acts robustly and outperforms the CAL in the different situations under investigation.
Diplôme : Magistère En ligne : ../theses/electronique/NOU6469.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9497 Détection CFAR de cibles réparties dans un clutter K-distribué de paramètres inconnus [texte imprimé] / Nabila Nouar, Auteur ; Atef Farrouki, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 96 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : MSD Détection CFAR distribution-k estimation des paramètres CFAR detection k-distribution parameters estimation كشف CFAR تشويش من نوع K تقدير المعاملات Index. décimale : 621 Electronique Résumé : In high resolution radars (HRR), unlike point-target model, targets are described as a reflection from isolated points, referred to as MDS (Multiple Dominant Scattering).
In this work, we consider the detection of spatially distributed targets (MDS model) embedded in K-distributed clutter with a partially correlated texture, and without any a priori knowledge about the clutter parameters.
To this end, we propose a new detection approach, based on the Cell-Averaging (CA) scheme, using Look up Tables (LT), which contain the pre-computed thresholding factors that maintain a constant false alarm rate.
The parameters of the K-distribution are estimated, in order to assign to the threshold its appropriate value according to the actual environment.
The performances of the proposed detector were analyzed and compared to those of the Logarithmic-based Cell Averaging detector (CAL), for different shape and scale parameters and correlation degrees.
The simulation results showed that the proposed detector (CA-LT) acts robustly and outperforms the CAL in the different situations under investigation.
Diplôme : Magistère En ligne : ../theses/electronique/NOU6469.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9497 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité NOU/6469 NOU/6469 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
Titre : Estimation du canal et élimination des interférences ICI dans les communications mobiles avec modulation OFDM Type de document : texte imprimé Auteurs : Abdelkhalek Baouni ; Univ. de Constantine, Éditeur scientifique ; Atef Farrouki, Directeur de thèse Année de publication : 2010 Importance : 61 f. Note générale : 01 Disponible à la salle de recherche 01 Disponible au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Interférences ICI Communications mobiles Modulation OFDM Index. décimale : 621 Electronique En ligne : ../theses/electronique/BAO5757.pdf Permalink : index.php?lvl=notice_display&id=2706 Estimation du canal et élimination des interférences ICI dans les communications mobiles avec modulation OFDM [texte imprimé] / Abdelkhalek Baouni ; Univ. de Constantine, Éditeur scientifique ; Atef Farrouki, Directeur de thèse . - 2010 . - 61 f.
01 Disponible à la salle de recherche 01 Disponible au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Interférences ICI Communications mobiles Modulation OFDM Index. décimale : 621 Electronique En ligne : ../theses/electronique/BAO5757.pdf Permalink : index.php?lvl=notice_display&id=2706 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAO/5757 BAO/5757 Thèse Bibliothèque principale Thèses Disponible
Titre : Estimation de canal à évanouissement rapide utilisant le modèle d’expansion sur bases orthogonales (BEM) dans les systèmes OFDM. Type de document : texte imprimé Auteurs : Abdelkhalek Baouni, Auteur ; Atef Farrouki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 95 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Electronique: Télécommunications Spatiales OFDM Estimation de Canal pilotes BER egalisation des donnée canal radio enolution rapide chanel Estimation pilotesdata equalisation radio chanel fast fading قناة ذات التغيير السريع معلومات ارشادية التنبؤ بحالة القناة Index. décimale : 621 Electronique Résumé :
In this thesis we have discussed the estimation of the multipath fast fading channel in OFDM systems. Channel estimation requires a large number of pilots, which reduces the number of subcarriers dedicated to the useful data transmission. In this thesis, our main goal is to carry out channel estimation algorithms aiming to achieve the best combination of estimation performance and maximum spectral efficiency, using the basis expansion model (BEM). In particular, we focus on the development of a reduced PDR (Pilot to useful Data Ratio) estimation techniques by proposing two techniques in order to improve the spectral efficiency while maintaining an acceptable estimation performance in terms of Mean Square Error (MSE), and Binary Error Rate (BER), in high mobility situations. Our contribution is mainly based on exploiting additional clustered pilots carried by adjacent OFDM symbols, in complement of those contained in the symbol under investigation. The roposed adjacent pilot-based method leads us to consider the two followings cases, according to the assumed channel hypothesis :
1) In the first case, we consider a doubly selective channel, based on a comb pilot structure with the BEM (basis expansion model) approximation. In such scenarios, certain statistical properties of the channel are assumed to be a priori known.
2) In the second case, we consider a high mobility situation along with another type of channel, known as multipath channel with sparse taps. This type of channel exhibits a fast variation of the taps delay interspacing, which causes a very large delay spread between the different taps.Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BAO7416.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11069 Estimation de canal à évanouissement rapide utilisant le modèle d’expansion sur bases orthogonales (BEM) dans les systèmes OFDM. [texte imprimé] / Abdelkhalek Baouni, Auteur ; Atef Farrouki, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 95 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Electronique: Télécommunications Spatiales OFDM Estimation de Canal pilotes BER egalisation des donnée canal radio enolution rapide chanel Estimation pilotesdata equalisation radio chanel fast fading قناة ذات التغيير السريع معلومات ارشادية التنبؤ بحالة القناة Index. décimale : 621 Electronique Résumé :
In this thesis we have discussed the estimation of the multipath fast fading channel in OFDM systems. Channel estimation requires a large number of pilots, which reduces the number of subcarriers dedicated to the useful data transmission. In this thesis, our main goal is to carry out channel estimation algorithms aiming to achieve the best combination of estimation performance and maximum spectral efficiency, using the basis expansion model (BEM). In particular, we focus on the development of a reduced PDR (Pilot to useful Data Ratio) estimation techniques by proposing two techniques in order to improve the spectral efficiency while maintaining an acceptable estimation performance in terms of Mean Square Error (MSE), and Binary Error Rate (BER), in high mobility situations. Our contribution is mainly based on exploiting additional clustered pilots carried by adjacent OFDM symbols, in complement of those contained in the symbol under investigation. The roposed adjacent pilot-based method leads us to consider the two followings cases, according to the assumed channel hypothesis :
1) In the first case, we consider a doubly selective channel, based on a comb pilot structure with the BEM (basis expansion model) approximation. In such scenarios, certain statistical properties of the channel are assumed to be a priori known.
2) In the second case, we consider a high mobility situation along with another type of channel, known as multipath channel with sparse taps. This type of channel exhibits a fast variation of the taps delay interspacing, which causes a very large delay spread between the different taps.Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BAO7416.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11069 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAO/7416 BAO/7416 Thèse Bibliothèque principale Thèses Disponible
Titre : Schemas hybrides d’acquisition adaptative de codes PN pour des communications DS-CDMA dans un canal rayleigh Type de document : texte imprimé Auteurs : Latifa Hacini, Auteur ; Atef Farrouki, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2012 Importance : 92 f. Format : 31 cm. Note générale : Docteur en Sciences
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : DS-CDMA codes PN schemas hybrides canal rayleigh Index. décimale : 621 Electronique En ligne : ../theses/electronique/HAC6270.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6228 Schemas hybrides d’acquisition adaptative de codes PN pour des communications DS-CDMA dans un canal rayleigh [texte imprimé] / Latifa Hacini, Auteur ; Atef Farrouki, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2012 . - 92 f. ; 31 cm.
Docteur en Sciences
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : DS-CDMA codes PN schemas hybrides canal rayleigh Index. décimale : 621 Electronique En ligne : ../theses/electronique/HAC6270.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6228 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAC/6270 HAC/6270 Thèse Bibliothèque principale Thèses Disponible
Titre : Systèmes de détection de cibles réparties en milieu non gaussien. Type de document : texte imprimé Auteurs : Nabila Nouar, Auteur ; Atef Farrouki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 132 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Modèles MDS cibles réparties Tables de correspondance Estimation des paramètres Moyenne géométrique Distribution K Distribution Inverse Gamma Distribution Pareto MDS Models Distributed Targets Lookup Tables Parameter Estimation Geometric Mean K-Distribution Inverse Gamma Distribution Pareto Distribution جداول المراسلات ، الأهداف الموزعة تقدير المعاملات متوسط هندسي توزيع Kتوزيع توزيع غاما معكوس توزيع Paret Index. décimale : 621 Electronique Résumé : In this PhD thesis, we address the problem of detection of spatially distributed targets embedded in a non-Gaussian clutter. Since, in high resolution detection systems (HRR), the target is modeled as a set of dominant reflectors according to the ""MDS"" (Multiple Dominant Scattering) concept, we propose to design detection architectures that operate in non-Gaussian environments modeled by distributions such as: the K distribution, the compound Gaussian model with Inverse Gamma texture and the Pareto distribution .We first introduce a detection
approach that detects MDS type targets embedded in a partially correlated distributed K environment whose parameters are unknown. This detector is referred to as M-pulse CA-LTCFAR (Multiple-pulse Cell Averaging based on Lookup Tables) . It is based on the integration of M-pulses, the CA detector and the use of Lookup tables (LT: Lookup Tables) and the integration of multiple pulses. This detector operates according to two essential phases:
empirical computing of thresholding factors that maintain a Constant Pfa (Probability of False Alarm), and a phase of ""pulse-to-pulse"" parameters estimation. We also propose an expression of the total energy of the target after pulse integration, and construct from this expression, the statistical hypothesis test of the M-pulse CA-LT-CFAR detector. In the same context, we propose two mean level based on Lookup Table detectors , namely: the GO-LT-CFAR (Greatest Of Based on Lookup Tables) and SO-LT-CFAR (Smallest Based Lookup Tables).
These two approaches are designed to detect MDS type targets embedded in compound Gaussian clutter with Inverse Gamma texture with unknown parameters. From the expression of the total energy of the target, we construct the statistical hypothesis tests of the GO-LTCFAR and the SO-LT-CFAR detectors. In addition, we introduce a detection approach that is based on the Geometric Mean (GM), allowing the detection of MDS targets embedded in a
clutter modeled by the Pareto distribution. Also, based on the properties of the Pareto and Exponential distributions, we present the working principle of the GM detector for distributed targets, and derive an expression of the total energy of the target. Finally, We construct the statistical hypothesis test of the GM detector for distributed targets and propose a mathematical expression of the Pfa of the GM detector.
Diplôme : Doctorat en sciences En ligne : ../theses/electronique/GHA6927.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10852 Systèmes de détection de cibles réparties en milieu non gaussien. [texte imprimé] / Nabila Nouar, Auteur ; Atef Farrouki, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 132 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Modèles MDS cibles réparties Tables de correspondance Estimation des paramètres Moyenne géométrique Distribution K Distribution Inverse Gamma Distribution Pareto MDS Models Distributed Targets Lookup Tables Parameter Estimation Geometric Mean K-Distribution Inverse Gamma Distribution Pareto Distribution جداول المراسلات ، الأهداف الموزعة تقدير المعاملات متوسط هندسي توزيع Kتوزيع توزيع غاما معكوس توزيع Paret Index. décimale : 621 Electronique Résumé : In this PhD thesis, we address the problem of detection of spatially distributed targets embedded in a non-Gaussian clutter. Since, in high resolution detection systems (HRR), the target is modeled as a set of dominant reflectors according to the ""MDS"" (Multiple Dominant Scattering) concept, we propose to design detection architectures that operate in non-Gaussian environments modeled by distributions such as: the K distribution, the compound Gaussian model with Inverse Gamma texture and the Pareto distribution .We first introduce a detection
approach that detects MDS type targets embedded in a partially correlated distributed K environment whose parameters are unknown. This detector is referred to as M-pulse CA-LTCFAR (Multiple-pulse Cell Averaging based on Lookup Tables) . It is based on the integration of M-pulses, the CA detector and the use of Lookup tables (LT: Lookup Tables) and the integration of multiple pulses. This detector operates according to two essential phases:
empirical computing of thresholding factors that maintain a Constant Pfa (Probability of False Alarm), and a phase of ""pulse-to-pulse"" parameters estimation. We also propose an expression of the total energy of the target after pulse integration, and construct from this expression, the statistical hypothesis test of the M-pulse CA-LT-CFAR detector. In the same context, we propose two mean level based on Lookup Table detectors , namely: the GO-LT-CFAR (Greatest Of Based on Lookup Tables) and SO-LT-CFAR (Smallest Based Lookup Tables).
These two approaches are designed to detect MDS type targets embedded in compound Gaussian clutter with Inverse Gamma texture with unknown parameters. From the expression of the total energy of the target, we construct the statistical hypothesis tests of the GO-LTCFAR and the SO-LT-CFAR detectors. In addition, we introduce a detection approach that is based on the Geometric Mean (GM), allowing the detection of MDS targets embedded in a
clutter modeled by the Pareto distribution. Also, based on the properties of the Pareto and Exponential distributions, we present the working principle of the GM detector for distributed targets, and derive an expression of the total energy of the target. Finally, We construct the statistical hypothesis test of the GM detector for distributed targets and propose a mathematical expression of the Pfa of the GM detector.
Diplôme : Doctorat en sciences En ligne : ../theses/electronique/GHA6927.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10852 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité NOU/7271 NOU/7271 Thèse Bibliothèque principale Thèses Disponible
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