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中文摘要：
研究了功率受限情况下多中继系统OFDM协作通信网络的上行链路容量最优化问题．利用混合二进制整数规划问题的优化分解方法，提出一种低复杂度的机会中继和功率分配的联合优化算法．首先针对每个中继子载波，提出了一种基于解码转发模式下的等效信道增益的机会中继选择策略；然后在此基础上通过凸优化算法，给出了源节点和多个中继节点之间的最优功率分配算法．仿真结果表明，相对于随机中继子载波选择以及平均功率分配，该算法具有较低复杂度的同时，能够显著提高系统性能和功率效率．
英文摘要：
The optimization of the uplink throughput of multi-relay cooperative orthogonal frequency division multiplexing （OFDM） network was considered. Then, this optimization problem was formulated as a mixed binary integer programming problem, joint optimization scheme of opportunistic relay and power allocation with low computational complexity was proposed. First an opportunistic relaying strategy was proposed based on equivalent channel power gain. Second, with convex optimization method, optimal power allocation among source and relays was followed. The simulation result shows that compared with random relaying selection and equal power allocation schemes, the proposed scheme can improve the system throughput with low computational complexity.
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