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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。
At present, the research of DMT in cooperative communication is mainly limited to Rayleigh fading channel, and it is a high signal-to-noise ratio (SNR) region analysis. However, the actual communication environment is not single, and the system SNR is limited. Considering the changes of channel environment and signal-to-noise ratio of practical communication system, the disruption probability and DMT performance of variable gain amplification and forwarding (AF) strategy in Rayleigh and Rice fading environment are respectively analyzed. The analysis shows that the DMT performance of variable-gain AF is better than that of Rayleigh fading in the Rayleigh fading channel when the signal-to-noise ratio is limited, and becomes better with the increase of the Rice factor K. At the same time, the derivation proves that the AF protocol has the same traditional high signal-to-noise ratio (DMT) performance under Rayleigh and Rice fading conditions. Compared with the traditional high SNR DMT analysis, the limited signal-to-noise ratio (DMT) analysis can describe the system performance more accurately and has more generality. Finally, the DMT performance of AF protocol with variable gain and fixed gain in Rayleigh fading environment is analyzed and compared.