OFDM协作通信中的机会中继和功率分配算法  

Opportunistic relay and power allocation optimization in cooperative OFDM networks

作　　者：李富年[1,2] 朱光喜[1] 王德胜[1] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074 [2]武汉科技大学电子与信息工程系,湖北武汉430081

出　　处：《华中科技大学学报（自然科学版）》2010年第9期14-17,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60802009;60496315);国家高技术研究发展计划资助项目(2008AA01Z204);国家科技重大专项资助项目(2009ZX03003-003;2009ZX03003-009);国家科技支撑计划资助项目(2008BAH30B12;2008BAH30B09)

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.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.

关 键 词：无线通信系统 正交频分复用 优化 机会中继 功率分配 

分 类 号：TN925[电子电信—通信与信息系统]