基于中继选择的协作通信系统遍历信道容量分析

Ergodic channel capacity analysis for relay selection based cooperative communication systems

本文对中继选择协作通信网络系统的遍历信道容量展开研究.在假设独立同分布瑞利信道条件下,分别推导出机会中继选择算法和部分中继选择算法解码转发中继模式下一些重要因素的闭式表达式,包括累计概率密度函数,累积分布函数和遍历信道容量.结果表明,利用中继选择技术能有效提高系统分集度.此外,遍历信道容量性能受中继节点数目、链路信噪比的影响.通过数值仿真分析验证了理论闭式解的正确性.实验结果表明通过信道反馈状态信息调节最优数据发送速率,非中断信道容量能达到遍历信道容量.

The ergodic capacity was studied that of relay selection cooperative communication network systems..The closed-form expressions of some important factors, including, the probability density function, the cumulative distribution function, and the ergodic capacity, were derived by considering the opportunistic selection and the partial selection of decode-and-forward relays, respectively, with independent and identically distributed rayleigh fading wireless links assumed. The results show the diversity degree can be effectively improved by relay selection techniques. Besides, the ergodic capacity can be substantially influenced by the number of relays, and the signal-to-noise ratio （SNR）. The closed-form expressions are verified by numerical simulation. The experiment results show that the non-outage channel capacity can reach to ergodic capacity though optimal data transmission rate being adjusted by the feedback channel state information.