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本文针对双跳全双工多中继系统,研究了在中继节点能量受限情况下的中继选择方案。在该文中,中继工作方式为放大转发(Amplify-and-Forward,AF),且中继通过收集源节点提供的能量来对源节点信息进行转发。整个通信过程分为两阶段,能量收集阶段与信息传输阶段,即采用的是时域分割方案。为了获得较好的性能与复杂度折中,本文分别研究了三种不同的中继选择策略,即最佳中继选择方案和两种次优中继选择方案。针对所提的三种方案,推导分析了其系统中断概率的理论值和下边界,以及系统的有效吞吐量。最后,利用蒙特卡洛仿真验证了理论分析的正确性,且仿真结果表明最佳中继选择方案的性能优于两种次优的中继选择方案,但其实现的复杂度高。
In this paper, the double-hop full-duplex multi-relay system is studied in the case of relay node energy limited relay options. In this paper, the relay works as Amplify-and-Forward (AF), and the relay forwards the source node information by collecting the energy provided by the source node. The whole communication process is divided into two phases, the energy collection phase and the information transmission phase, that is, the time-domain segmentation scheme is adopted. In order to get better compromise between performance and complexity, this paper separately studies three different relay selection strategies, namely best relay selection scheme and two sub-optimal relay selection schemes. According to the three schemes proposed, the theoretical value and lower bound of the system outage probability and the effective throughput of the system are deduced and analyzed. Finally, the correctness of the theoretical analysis is verified by Monte Carlo simulation, and the simulation results show that the performance of the best relay selection scheme is better than the two sub-optimal relay selection schemes, but its implementation complexity is high.