基于链路自适应的机会协作系统性能分析

Performance Analysis of Opportunistic Cooperation Systems with Link Adaptation

为了提高协作通信质量,提出基于自适应解码前向的机会中继协作方案,并通过建立一个统计概率模型来分析该方案下的系统性能.推导出瑞利衰落信道下的系统概率密度函数,以及基于自适应调制下的系统频谱效率、中断率和平均误码率的闭式解.蒙特卡洛仿真实验结果表明:自适应解码前向机会协作系统的性能要优于放大前向机会协作系统,其频谱效率高于放大前向机会协作系统30%左右.

In order to improve the cooperative communication quality,this paper proposes an opportunistic cooperation scheme with adaptive Decoding-forward（DF） relaying,and analyzed the system performance of this scheme by establishing a general mathematic probability model.Based on the derivation of the system probability density function in Rayleigh fading channels,the closed-form expressions of the average spectral efficiency,outage probability and average bit error rate were obtained with the system in link adaptation.Monte Carlo simulations have shown that this adaptive decode-and-forward opportunistic cooperation outperforms previous systems and has about 30% higher average spectral efficiency than the Amply-and-forward（AF） cooperative system.