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协作通信技术能有效提高无线网络系统的误码率(SER)性能。采用译码转发(Decode-Forward,DF)协议的单中继的协作通信系统,推导并给出了线性拓扑结构下DF系统的平均误码率性能上界表达式,并以最小化平均SER为目标,分别从功率分配比和中继位置两个角度进行了优化;最后通过数值分析的方法求解出DF协作系统的最优参数对。理论分析和仿真结果表明,以此最优参数对为参考标准来选择中继伙伴和分配功率,可以使DF协作系统的平均SER最优化。
Cooperative communication technology can effectively improve the bit error rate (SER) performance of wireless network systems. The single relay cooperative communication system with Decode-Forward (DF) protocol is used to derive and express the upper bound of the average BER performance of DF system under linear topology. The average SER Objectives are optimized respectively from two aspects: power distribution ratio and relay position. Finally, the optimal parameter pair of DF collaborative system is solved by numerical analysis. Theoretical analysis and simulation results show that the average SER of DF collaborative system can be optimized by choosing the best relay partner and power allocation as the reference.