基于EGC极化分集技术的最优中继选择协同通信

最优中继选择(Optimal Relay Selection, ORS)无需所有节点精准同步，可极大地简化网络物理层设计。等增益合并(Equal Gain Combining, EGC)不需要对衰落幅度估值，每条支路具有相等的单位增益，权重系数不随衰落信道信号的强度发生改变，可简化系统设计与实现的复杂度。本文提出给通信终端配置极化天线，在不增加终端体积的同时采用EGC处理极化分集信号，达到克服信道衰落和提升解码转发ORS协同通信系统性能的目的。理论分析和仿真结果表明，解码转发ORS协同通信系统在信道衰落和信噪比相同的条件下，中断概率指标明显好于未采用EGC极化分集技术的协同通信系统。最后将EGC与其它分集合并技术进行了比较。

Optimal Relay Selection Cooperative CommunicationBased on Polarization Diversity Technology with Equal Gain Combining

In multi-relay cooperative communication, Optimal Relay Selection (ORS) greatly simplifies network physical layer design by eliminating the need for accurate synchronization of all nodes. Equal Gain Combining (EGC) does not need to evaluate the decline amplitude, each branch has the same unit gain, weight coefficient does not change with the strength of fading channel signal at any time, which simplifies the complexity of the system design and implementation. Therefore, we propose in this paper, the polarization antenna is configured for the communication terminal, and the polarization diversity signal is processed by EGC without increasing the terminal volume, so as to overcome channel fading and further improve the performance of Decode-and-Forward ORS cooperative communication system. The theoretical analysis and simulation results show that the outage probability index of Decode-and-Forward ORS cooperative communication system is obviously better than that of the cooperative communication system without EGC polarization diversity technology in the same SNR and channel fading. Finally, EGC is compared with other polarized diversity merging techniques.