Abstract: Based on multi-user non-regenerative collaborative network, this paper proposes an improved relay selection strategy of multi-user cooperative communication system. It defines an Equivalent Channel Gain(ECG), according to the channel statistical properties of source to relay and relay to the destination nodes, that is, combined with the Signal to Noise Ratio(SNR), to choose different sets of relay nodes to make outage probability of system minimum. Experimental results show that when the outage probability is 10?3 at the high SNR, this paper’s algorithm outperforms All Relays Amplify-and-Forward(AAF) algorithm with about 0.2 dB SNR gain, and system resource utilization is improved. The algorithm outperforms Single Relay Amplify-and-Forward(SAF) algorithm with about 3.5 dB SNR gain.

Key words: cooperative communication, relay selection, channel statistical information, Equivalent Channel Gain(ECG)

摘要： 基于多用户非再生协作网络，提出改进的多用户协作通信系统中继选择策略。假设在源节点和中继节点功率相等的条件下，利用源到中继、中继到目的节点的信道统计信息定义等效信道增益，并将其与信噪比结合，选择不同的中继节点集合，使得系统中断概率最小。实验结果表明，在高信噪比情况下，当中断概率为10?3时，与中继放大转发算法相比，可获得0.2 dB的信噪比增益，与单中继转发算法相比，信噪比增益为3.5 dB，能提高系统资源利用率。

关键词: 协作通信, 中继选择, 信道统计信息, 等效信道增益

CLC Number: 

• TP393.03