Nguyen, Dai
(2016).
La gestion des ressources radio dans les systèmes satellitaires.
Mémoire.
Québec, Université du Québec, Institut national de la recherche scientifique, Maîtrise en télécommunications, 83 p.
Résumé
Due to the constantly growing satellite traffic, more and more satellites have been
launched into the orbit. This leads to rising congestion on both the earth orbit
and radio spectrum, which results in increasing radio-frequency interference (RFI)
in the satellites communications. Moreover, spectrum reuse for communications in
different beams of multibeam satellites, which generates co-channel interference, can
result in degradation of communication reliability and performance if the interference
is not managed appropriately. To tackle the interference mitigation and better
exploit satellite radio resources, we have proposed some advanced resource allocation
techniques for satellite communications. Specifically, we have developed radio
resource management frameworks in two satellite communications settings, namely
the single satellite system and the co-existing dual satellite system.
For the single multi-beam satellite system, we have studied the joint beamforming,
carrier allocation, and user scheduling problem which aims to maximize the system
sum rate and sum utility. To tackle the two underlying problems, two corresponding
iterative resource allocation algorithms have been developed. In both algorithms, the
advanced weighted minimum mean square error (WMMSE) beamforming scheme has
been employed to determine the beamformers based on which carrier allocation and
user scheduling design can be addressed. Extensive numerical results have demonstrated
the efficiency and desirable performance of the proposed algorithms.
For the co-existing dual satellite system, a cognitive radio based reverse-link resource
allocation framework has been developed where the two satellites have been treated
as the primary and secondary satellites, respectively. The resource allocation design
for this setting involves the optimization of power allocation and users’ antenna
angles to maximize the average system sum rate considering maximum power and
interference protection constraints. To accomplish this design, we have derived the
optimal power allocation solution for given secondary users’ angles and derived the
optimal secondary users’ angles for a given power allocation solution. Then, we
have proposed an iterative resource allocation algorithm based on these derivations
to address the considered problem. Finally, we have carried out numerical studies
to investigate the performance of the proposed algorithm which have confirmed the
performance superiority of the proposed algorithm compared to other conventional
resource allocation approaches.
| Type de document: |
Thèse
Mémoire
|
| Directeur de mémoire/thèse: |
Le, Long Bao |
| Mots-clés libres: |
ressources radio; systèmes satellitaires; interférences; allocation des ressources radio; communications satellitaires; erreur quadratique moyenne pondérée avancée; MISO satellites à faisceaux multiples; |
| Centre: |
Centre Énergie Matériaux Télécommunications |
| Date de dépôt: |
26 avr. 2017 13:44 |
| Dernière modification: |
26 avr. 2017 13:44 |
| URI: |
http://espace.inrs.ca/id/eprint/5120 |
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