الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The channel in the wireless communication suffers from several problems such as fading and interference. There are several techniques to overcome these problems. Network cooperation is one of the most important of those techniques. Although cooperative relaying has many advantages to improve performance and increase reliability in wireless communication, it has a number of detrimental effects on performance in the network. This includes interference, cost, complexity, and overhead in the network, which may degrade the performance of the network in some cases when enabling the cooperation in the system. For this reason, before enabling cooperation in wireless communication, there are three main questions must be studied. These questions are: when to cooperate? Whom to cooperate with? And how to protect ongoing cooperative relaying? This thesis focus on the answer of the first question, when to cooperation? For this reason, this thesis evaluates the overall throughput, with and without the cooperation for four different cooperative MAC protocols to determine the regions where the cooperation is beneficial or non-beneficial. These protocols are cooperative CSMA protocol, cooperative CSMA/CA protocol, ideal cooperative MAC protocol and cooperative network coding protocol. In addition, it proposes four different scenarios to evaluate the performance of these protocols. Hence, this thesis derives the mathematical model for these protocols in the proposed scenarios. Afterwards, the overall throughput, with and without cooperative relaying, is evaluated for all scenarios by using the four cooperative MAC protocols. Finally, this thesis determines whether the proposed cooperative MAC protocols are beneficial or not in the four scenarios. Moreover, the regions where cooperative relaying protocols are beneficial are discussed for each scenario and the reasons for that. The results show that the cooperation for a cooperative network coding is beneficial regardless of the number of couples (source, destination) that using the same relay. While the cooperation for cooperative CSAM, cooperative CSMA/CA and ideal cooperative MAC protocol become non-beneficial when the number of pairs (source, destination) is more than two.