| The technology of relay can expand the coverage of communication network at a lower cost. Furthermore, not only can cooperative relay enhence the reliability of information transmission, and but also can improve the quality of communication for specific area. Research on cooperative relay has already become a hot research topic.This dissertation focuses on many key issues of cooperative relay for future mobile communication system. Firstly, it outlines the development from the diversity technology to Multiple-Input Multiple-Output (MIMO) technology, and then to the cooperative relay technology. The capacity and power allocation of cooperative relay under different models are studied deeply. Then, this dissertation explores and studies the problem of resource allocation for the cooperative relay system in terms of power cost and cost, respectively. Thirdly, Game Theory is used to solve the problem of power allocation between nodes in cooperative relay system. The detailed research contents and the main contributions of this dissertation are presented as follows:Firstly, the system capacities of dual-hop Amplify-Forward (AF) relay and Decode-Forward (DF) relay are investigated, and optimal power allocation is taken into account for the analysis. Moreover, the selecting methods and processes between cooperative mode and non-cooperative mode of the dual-hop AF and DF relay are obtained.Secondly, the outage capacity of the dual-hop DF relay is analyzed, and the impact of the optimal power allocation is taken into account. Through a series of analyses and derivations, the constraint equation is obtained for the dual-hop DF relay, which is related with factors of outage capacity, the outage probability and the power allocation. The corresponding simulation results reveals the relationship among the three factors, moreover, the system performance is improved with optimal power allocation, which means that advantages of optimal power allocation is more obvious as the gap of channel gains between channels is enlarged.Thirdly, outage capacity and optimal power allocation of the dual-hop DeModulate and Forward (DMF) relay system are analyzed. The upper bound of outage capacity for the DMF relay system is obtained under optimal power allocation. Simulation results verify the advantage of optimal power allocation.The optimal power allocation based on the concept Power Cost for cooperative relay system is proposed and analyzed. With definitions for Power Price and Power Cost, the problem of power allocation is converted into the problem of power cost allocation. Outage probability is used to evaluate the system performance. Through these analyses of the dual-hop DF relay system and multiple-hop DF relay system, the optimal solution of power allocation based on power cost is obtained. At last, simulation results verify the advantage of the proposed optimal power allocation based on power cost.The deployment of structure based on optimal cost allocation for cooperative relay system is proposed and analyzed. According to their different characters, the cost of cooperative relay system is divided into two categories, daily cost and fixed cost. Outage probability is used to evaluate the system performance. On the basis of these analysis results of the multiple-hop DF relay system, reasonable number of hops based on cost allocation for the system is obtained. Moreover, based on comparison among three types of relay system structures---dual-hop relay system with one relay node, dual-hop relay system with two relay nodes and non-relay system, the selection method of relay system structures is provided.A Game method of maximizing payoffs is proposed to solve the problem of the power allocation between the source node and the relay node in dual-hop DF relay system. Payoffs of the source node and the relay node in dual-hop DF relay system are obtained by the Non-Cooperative Game, respectively. According to these results, a Game method of maximizing payoffs is proposed, and feasible ranges of payoffs are given. |
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