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05/02/2014

Thesis defense in Information and Communication Technologies



Thesis defense in Information and Communication Technologies presented on February 5th 2014 in Amphi II at 9:00 AM, Sup'Com.


Entitled : Cooperative Communication and Cognitive Radio

Presented by : Hela HAKIM 

Committee


President :

Mr. Ammar Bouallegue

Professor, ENIT, Tunisia

 

 

 

Reporters :

Mr. Mohamed Slim Alouini

Professor, Kaust, Saudi Arabia

 

Mr. Nouredine Hamdi

Professor, INSAT, Tunisia

 

Examiner :

Mr. Sofiane Cherif

Professor, Sup’Com, Tunisia

 

Supervisor :

Mr. Hatem Bouejmaa

Professor, Sup’Com, Tunisia


Abstract


This thesis focuses on two major issues. First, the design and investigation of novel relaying protocols that induce end-to-end cooperative diversity for broadcast networks, cooperative Direct-Sequence and Multi-Carrier Code Division Multiple Access networks. Second, the study and investigation of spectrum sharing schemes in cognitive radio networks. Concerning the first issue, several single relay selection schemes in broadcast wireless networks using either selective digital relaying or selective analog relaying have been investigated. In the other hand, the performance of cooperative Multi-Carrier and Direct-Sequence Code Division Multiple Access systems have been studied. First, we have derived the end-to-end Bit Error Probability for cooperative Multi-Carrier Code Division Multiple Access systems using selective threshold digital relaying. Second, we have derived the end-to-end Bit Error Probability for cooperative Direct-Sequence Code Division Multiple Access systems using incremental selective relaying which combines selective relaying with incremental relaying protocols in the presence of multipath propagation. Concerning the second issue, we have studied the influence of the use of fixed transmit power in underlay spectrum sharing. In fact, the use of fixed transmit power nodes alleviates the signaling requirements of underlay cognitive radio networks compared to the adaptive transmit power nodes. Second, we have investigated several broadcast transmission schemes to enable spectrum sharing in broadcast cognitive radio networks. We have also proposed dynamic spectrum sharing schemes where a pair of secondary users and a pair of primary users bidirectionally communicate.


Keywords


cooperative communication, relaying, relay selection, spectrum sharing, performance analysis.