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协作分集使得在多用户环境下,具有单天线的多个终端可以共享彼此的天线,以形成一个虚拟的天线阵列结构,实现空域分集。首先介绍了多用户SIMO-OFDM系统中的两种协作方式,放大前传和译码前传。然后针对源结点和目的结点之间是否存在路径损耗,提出了一种基于信道状态信息的选择中继协作方式,并对系统性能进行了理论和仿真分析。仿真结果表明,这种基于信道状态信息的选择中继协作方式可以获得较好的系统性能。
Collaborative diversity enables multiple terminals with a single antenna to share each other’s antennas in a multi-user environment to form a virtual antenna array structure for spatial diversity. First introduced two kinds of cooperation ways in multi-user SIMO-OFDM system, enlarge the prequel and transliteration. Then based on the existence of path loss between the source node and the destination node, this paper proposes a selective relay cooperation mode based on channel state information, and analyzes the system performance theoretically and simulatively. Simulation results show that this kind of selective relay cooperation mode based on channel state information can get better system performance.