中文摘要：

多中继协同分集技术在慢衰落无线环境下可以提供巨大的性能增益。该文从接收端平均误符号率的角度,分析了独立的瑞利衰落信道下,采用放大转发的多中继协同最大比合并检测方案和多节点侦听,单中继转发的机会中继方案的性能;并基于矩生成函数推导出两种方案下M-PSK和M-QAM调制信号平均误符号率的闭合表达式。经蒙特卡罗仿真验证,该表达式在中高信噪比下与仿真的实际结果非常吻合。同时也可以看出机会中继的分集增益与协同侦听的节点数成正比,误符号率性能优于使用最大比合并检测的多中继协同方案。

英文摘要：

Cooperative diversity with multi-relay provides dramatic gains in slow fading wireless environments. In terms of average Symbol-Error Rate（SER） at the destination, the performances of multi-relay cooperative transmission with Maximal Ratio Combining（MRC） detection and opportunistic relaying with multi-node listening were analyzed, one relay retransmitting in Amplify-and-Forward（AF） networks under independent Rayleigh slow fading channels. The closed-form expressions of SER for M-PSK and M-QAM modulations are also derived based on Moment Generating Function（MGF）. Monte Carlo simulation results show that all the SER formulas proposed are tight bounds particularly at medium and high SNR. Moreover, it can be seen that the opportunistic relaying, whose diversity gains are proportional to the number of cooperative listening nodes, and performs better in SER than multi-relay cooperation using MRC detection algorithm.