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研究半双工正交频分复用(OFDMA)中继网络的资源分配。解决动态子信道分配,自适应功率分配,传输策略选择和中继选择的联合优化问题。为了公平利用中继用户的资源,把中继用户所能帮助的最大子信道数和每个子信道的功率设为常量。在此基础上,提出贪婪算法以最大化总效用。当算法每次分配资源时,把资源分配给潜在效用增长最大的用户。仿真结果表明所提算法与固定的资源分配策略相比,能更高效地利用资源,并且改善了用户间的公平性。
Study the resource allocation of half-duplex orthogonal frequency division multiplexing (OFDMA) relay network. Solve the joint problem of dynamic sub-channel allocation, adaptive power allocation, transmission strategy selection and relay selection. In order to make fair use of the resources of the relay users, the maximum number of sub-channels and the power of each sub-channel that the relay users can help is set as a constant. On this basis, proposed greedy algorithm to maximize the total utility. Each time an algorithm allocates resources, resources are allocated to users whose potential utility growth is the largest. The simulation results show that compared with the fixed resource allocation strategy, the proposed algorithm can utilize resources more efficiently and improve the fairness among users.