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Agenda

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


Chair

Monia Turki

Professor at ENIT, Tunisia

 

 

 

Reviewers

Mohamed IBNKAHLA

Professor at Carleton University, Canada

 

Mohamed Lasaad Ammari

Associate professor at ENISO, Tunisia

 

Examiner

Fatma Abdelkefi

Associate professor at Sup’Com, Tunisia

 

Supervisors

Mohamed Siala

Professor at Sup'Com, Tunisia

 

Noura Sellami

Professor at ENIS, Tunisia

 

Abstract


In 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.


Keywords


Cooperative 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.