Nakagami-m信道协作网络编码中断性能分析

无线网络编码是一项能极大提高无线网络流量的有用技术,而协作分集可以有效地克服无线衰落的影响。研究了Nakagami-m信道下协作网络编码系统中断性能,分析了不同协作策略下的互信息表达式,推导了协作网络编码中断概率闭式表达式,并对分析的结果进行了仿真。仿真结果显示,在高SNR和谱效率R〈4条件下,协作网络编码中断概率较分布式空时编码性能SNR增益有接近2 dB的提高,并且随分布参数m值的增大,协作网络编码中断概率性能逐步改善。

Outage Performance of Cooperative Network Coding over Nakagami-m Channels

Wireless network coding is a useful technology and could dramatically increase the total throughput of wireless networks,while cooperative diversity could effectively mitigate the effect of fading channel.In this paper,outage probability of cooperative network coding over nakagami-m fading channels is studied.The mutual information for different cooperative strategies is also analyzed.Closed-form outage probability expressions for cooperative network coding are also derived.The simulation results verify the correctness of the analysis,and also show that,with high SNR and spectral efficiency R4,cooperative network coding outperforms distributed space-time coding（DSTC）schemes in terms of SNR gain nearly 2dB,and performance of outage probability increases along with distribution parameter m.