瑞利和莱斯信道下放大转发DMT性能  

DMT Analysis of Amplify-and-Forward in Rayleigh and Rician Fading Channels

作　　者：房务将[1] 高媛媛[2] 江天明[1] 龙彦汕[3] 

机构地区：[1]解放军理工大学通信工程学院研究生3队,江苏南京210007 [2]解放军理工大学通信工程学院 [3]解放军理工大学通信工程学院研究生2队

出　　处：《军事通信技术》2013年第1期37-42,共6页Journal of Military Communications Technology

基　　金：国家自然科学基金资助项目(60972050)

摘　　要：当前协同通信中分集复用折中(DMT)的研究主要限于瑞利衰落信道,且为高信噪比(SNR)区域分析,但实际通信环境不是单一的,且系统信噪比是有限的。文中综合考虑实际通信系统信道环境变化和信噪比的限制,分别分析了变增益放大转发(AF)策略在瑞利和莱斯衰落环境下的中断概率和DMT性能。通过分析发现,当信噪比有限时,在莱斯衰落信道下变增益AF的DMT性能优于其在瑞利衰落环境下的性能,且随着莱斯因子K增大而变好。同时,推导证明了AF协议在瑞利和莱斯衰落环境下具有相同的传统高信噪比DMT性能。相比传统高信噪比DMT分析,有限信噪比DMT分析能够更准确的刻画系统的性能,更具有一般性。最后,对比分析AF协议采用变增益和固定增益在瑞利衰落环境下的DMT性能。The present researches on DMT analysis of cooperative communications mainly focus on the Rayleigh fading channels and the high-SNR region; while in practice, the channel is complex and the systems work in the finite SNR. Analysis was made of the outage probability and DMT performance of variable-gain AF in the Rayleigh and Rician fading channels respectively. The results show that the DMT performance in the Rician channel is better than that in the Rayleigh channel at finite SNR region and even more superior with the increase of Rician factor. The conventional high SNR DMT in the Rayleigh and Rician fading channels have the same performance. Compared with the conventional high SNR DMT, the finite SNR one can reflect the real system performance more precisely and has generality. Finally, the performance between variable-gain AF and fixed-gain AF was compared in the Rayleigh channel.

关 键 词：放大转发 分集复用折中 中断概率 瑞利衰落 莱斯衰落 

分 类 号：TN925.3[电子电信—通信与信息系统]