全双工中继选择策略的性能研究

Performance Research on Full-Duplex Relay Selection Scheme

为了提高协同通信系统的频谱效率,对全双工中继通信系统进行了研究.首先,介绍了传统的主动机会中继策略和最优的全双工中继选择策略,并在最优全双工中继选择策略的基础上提出了增强型全双工中继选择策略;其次,分析了主动机会中继选择策略应用在全双工中继网络中的中断性能,推导了3种策略中断概率的闭式精确结果和高信噪比(SNR)下的近似逼近结果;最后,通过数值仿真分析验证了理论推导结果的正确性.研究结果表明:在高SNR范围时,最优全双工中继选择策略和主动机会中继选择策略的中断性能趋于平台效应;增强型全双工中继选择策略的中断性能会随着SNR的增大而一直提高,且增强型全双工中继选择策略的中断性能明显最优,主动机会中继选择策略的性能最差.

To improve spectral efficiency of the cooperative communication system,the communication system with full-duplex relay was investigated. First,the conventional proactive opportunistic relaying and the optimal full-duplex relay selection were introduced. Then,an incremental full-duplex relay scheme was proposed based on the optimal full-duplex relay selection. Next,the outage performance of the proactive opportunistic relaying used in the full-duplex relay network was analyzed,and the accurate closed form expressions of the outage probabilities of these three schemes were derived.Furthermore,the approximations of the outage probabilities in the high signal-to-noise ratio（ SNR）regime were obtained. At last, the theoretical results of the proposed scheme were verified by numerical simulations. The simulation results show that the outage performance of the proactive opportunistic relaying and the optimal full-duplex relay selection tends to platform effect in high SNR,and the outage performance of incremental full-duplex relay scheme is improved with the increasing SNR. Meanwhile,the outage performance of incremental full-duplex relay scheme is the best,the outage performance of the proactive opportunistic relaying is the worst.