République Tunisienne
Ministère de l'Enseignement Supérieur et RS Ministère des Technologies de la Communication et de l'Economie Numérique
Université de Carthage
La RechercheEspace membreCet espace est dédié aux étudiants, aux enseignants et au personnel administratif de l'école |
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Evènements et manifestations 14/12/2016 Doctorate thesis defense of Mariem Ayedi
Doctorate thesis defense on December 14th 2016 at 11H00 AM ,in Amphi I, Sup’Com. Entitled :OPTIMAZTION ON ENERGY CONSUMPTION IN COOPERATIVE SYSTEMS Presented by : Mariem Ayedi Committee
AbstractIn this thesis, we are interested in the energy optimization problem in cooperative systems. We begin by considering a cooperative ARQ system in which two source nodes and a relay node retransmit packets to a destination node. We optimize the energy of the relay node according to the retransmission number and according to the number of packets to be retransmitted in order to maximize the overall throughput efficiency constrained by a maximum average relay energy cost. Then, we are interested in the nodes identification problem in cooperative systems which is classically performed by transmitting signaling bits resulting in a waste of energy and throughput. To solve this problem, we propose an efficient embedded signaling scheme. We consider finally the problem of energy optimization in a cooperative system with interfering channels. We propose an iterative distributed energy-efficient algorithm in which each node announces a price which reflects its loss in terms of utility due to the received interferences and adjusts its energy by taking into account prices of the other nodes. KeywordsCooperative communication, relay nodes, energy consumption, Cooperative ARQ Protocol, throughput maximization, Analog network coding, embedded signaling, nodes identification, precoding sequences, modulation alphabets, M-sequences, block codes, interfering channels, distributed energy optimization, pricing. |
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