存在多个干扰时的机会中继性能分析

Performance analysis of opportunistic relaying with multiple interferers

在多个干扰对中继节点和目的节点都产生影响时,为了最小化中断概率,提出了3种机会中继选择协议:目的节点忽略直接传输,目的节点采用选择合并(SC),目的节点采用最大比值合并(MRC).推导了独立同分布和独立不同分布瑞利信道中3种机会中继选择协议的中断概率.仿真结果与理论分析结果一致,并且就中断概率而言,当源节点与中继节点之间信道质量较差时,采用SC的机会中继协议性能优于其他两种协议.反之,采用MRC的机会中继协议性能最优.

With multiple interferers on both the relays and the destination, three opportunistic relaying protocols are proposed to minimize the outage probability in distinct cases： with direct transmission negligible, selection combining （SC） deployed at the destination, and maximum ratio combining （MRC） deployed at the destination. The exact outage probabilities of opportunistic relaying protocols are derived over independent identically distributed and independent non identically distributed Rayleigh fading channels. Finally, simulation results validate our analysis and show that, in terms of outage probability, when the channels between the source and the relays are in deep fading, the opportunistic relaying protocol with SC is better than the other two protocols. Conversely, the opportunistic relaying protocol with MRC is the best.