基于信道特性的中继选择协作通信方法研究

根据信道统计特性,研究了放大转发(amplify-and-forward,AF)协作中继网络中的中继选择协作通信方法.首先分析指出在等功率条件下,当信噪比小于某个门限时,选择单个中继节点进行转发(pre-select single relay AF,SAF)比所有节点都转发(all relays AF,AAF)的中断概率小.基于此信噪比门限提出一种中继选择协作通信方法,并且指出这种选择方法使得SAF的中断概率最小;然后结合功率分配提出了一种使中断概率最小化的最优中继选择协作通信方法;最后为了降低复杂度,提出了一种次优中继选择协作通信方法.仿真结果表明,这种次优方法和最优中继选择协作通信方法相比,性能相近.

Study of statistical channel knowledge-based cooperative relay selection

Statistical channel knowledge-based cooperative relay selection in amplify-and-forward cooperative relay networks was studied.Firstly,it was proved that pre-selecting a single relay is better than selecting all relays in terms of the outage probability when the signal-to-noise ratio(SNR)is below a threshold.Based on this,a cooperative relay selection scheme was proposed and proved to be optimal.Secondly,an optimal cooperative relay selection scheme combined with a power allocation scheme was given.Finally,a sub-optimal scheme was proposed to reduce the complexity.Simulation results show that the performance of the sub-optimal scheme is nearly the same as that of the optimal scheme.