摘要： 针对多用户协作通信网中存在共信道干扰和过时信道状态信息的问题,提出一种通过预测信干比进行中继选择的方法。根据特定的分布产生随机数,将该随机数与测量信干比相加生成预测信干比,选择具有最大预测信干比的中继节点转发数据。在此基础上,对基于该中继选择方法的译码转发协作通信系统进行性能分析,推导获得预测信干比的概率密度函数,从而得到平均误码率和中断概率的解析表达式。仿真结果与理论分析一致,同时数值结果表明,与基于过时信干比的中继选择方法相比,该方法在系统的误码率和中断性能上具有明显优势。

关键词: 中继选择, 共信道干扰, 预测, 半双工译码转发, 多用户, 随机数, 信干比

Abstract: To cope with the Co-Channel Interference(CCI) and outdated channel status information in the multi-user cooperative communication network,a relay selection method by using predicted Signal to Interference Ratio(SIR) is proposed.In this method,a random number is produced by the specified distribution and added to the measured SIR,so as to generate the predicted SIR.Then the relay node with the largest predicted SIR is selected for data forwarding.The performance of the Decode-and-Forward(DF) cooperative communication system utilizing the proposed relay selection method is analyzed.On this basis,the probability density function of the predicted SIR is derived,and the analytic expressions of average Bit Error Rate(BER) and outage probability are obtained.Simulation results match the analytical results,and the numerical results show that the proposed method is superior to the relay selection method based on outdated SIR in terms of BER and outage performance.

Key words: relay selection, Co-Channel Interference(CCI), prediction, half duplex Decode-and-Forward(DF), multi-user, random number, Signal to Interference Ratio(SIR)

中图分类号: 

• TN925