Chaggara, Ridha (2004) Adaptive Waveforms for Multimedia Satellite Applications in Ka Band Based on Continuous Phase Modulation. PhD thesis Télécommunications et Traitement du Signal, ENST - COMELEC Communication et Electronique, ENST.

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Licence: Copyright Ridha Chaggara

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Abstract

The Present thesis deals with the uplink in future satellite communication systems for multimedia applications in Ka band. More precisely we are concerned by the design of an adaptive waveform to cope with the stringent propagation conditions in Ka band. Such waveform will provide higher system capacity by adopting spectral efficient waveform at clear sky propagation. It will also improve system availability by selecting power efficient waveform during fading events. CPM based waveform is adopted as a solution for the waveform design. Motivations are the followings: First, constant envelope signals allow us to operate user terminal amplifier near saturation which provide higher power efficiency. Secondly, high power performances are obtained when CPM is serially coded with convolutional code with iterative decoding. Finally, waveform parameters diversity (modulation order, modulation index, pulse shape - ) is very helpful to design an adaptive waveform. The proposed adaptive waveform is mainly based on the modulation index variation while keeping the same denominator. This solution leads to the same receiver structure and complexity, it require, however, a specific filter banc associated to each modulation index. Three CPM schemes with different modulation indexes are considered: the binary 3RC, the quaternary 2RC and the octal 2RC. Simulation results show that binary scheme is more efficient at low Eb/N0 . However quaternary and octal CPM offer higher spectral efficiency during favorable propagation conditions. Therefore, those schemes seem to be more suitable for adaptive waveform. The octal 2RC is particularly an attractive scheme, it requires, higher complexity

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Table of content

Abstract
Keywords
Résumé
Mots Clés:
Glossaire
Liste des tableaux
Liste des figures
Table des matières
1. Introduction
1.1 Motivations de la Thèse
1.2 Principales Contributions
1.3 Organisation du Manuscrit
2. Canal Satellite en Bande Ka
2.1 Introduction
2.2 Etude de la Capacité du Canal
2.3 Canal Satellite en Bande Ka
2.3.1 Classification des atténuations en bande Ka
2.3.2 Statistiques relatives aux atténuations
2.4 Différentes Méthodes de Compensations
2.4.1 Contrôle de puissance
2.4.2 Techniques de diversité
2.5 Forme d'Onde Adaptative
2.5.1 Variation du débit utile
2.5.2 Modification du taux de codage
2.5.3 Modulation adaptative
2.6 Conclusion
3. Les Modulations à Phase Continue
3.1 Introduction
3.2 Représentation et Etude des Signaux CPM
3.2.1 Les Signaux CPM
3.2.2 Représentation Treillis des CPM
3.2.3 Décodage des signaux CPM
3.3 Performances des Modulations CPM
3.3.1 Occupation spectrale
3.3.2 Performances en puissance
3.3.3 Performances spectre-puissance
3.3.4 Simulation du taux d'erreur binaire
3.4 Conclusion
4. Décodage Itératif et Application aux CPM
4.1 Introduction au Codage Canal
4.1.1 Introduction générale
4.1.2 Les codes convolutifs
4.2 Codes Concaténés et Décodage Itératif: Turbo Codes
4.2.1 Introduction
4.2.2 Principes de codage
4.2.3 Principes de décodage
4.3 Application aux CPM
4.3.1 Principes et modélisation du système
4.3.2 Démodulation et décodage
4.4 Simulations et Analyse des Performances
4.4.1 Influence de la longueur de contrainte du code
4.4.2 Influence de la taille de l'entrelaceur
4.4.3 Performances de quelques schémas CPM
4.5 Analyse de la Convergence
4.6 Conception d'une Forme d'Onde Adaptative
4.7 Performances en Mode MF-TDMA
4.7.1 Présentation et modèle
4.7.2 Performances en mode multi-porteuses
4.8 Conclusion
5. Emetteur et Récepteur de Signaux CPM
5.1 Introduction
5.2 Emetteur CPM
5.3 Récepteur des signaux CPM
5.3.1 Modèle du signal
5.3.2 Filtrage et calcul des métriques
5.3.3 Processus de décodage itératif
5.4 Information Canal et Adaptativité
5.5 Conclusion
6. Performances dans un Canal non Linéaire
6.1 Introduction
6.2 Résultats des Simulations et Analyse
6.2.1 Présentation du modèle
6.2.2 Effet de l'amplificateur sur le TEB
6.2.3 Comparaison entre le DVB-RCS et les CPM
6.3 Conclusion
7. Conclusions et Perspectives
7.1 Conclusions
7.2 Perspectives
A. Algorithme de Viterbi pour les CPM
B. Décomposition de Rimoldi
Bibliographie

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