能量收集全双工中继网络中的中继选择策略研究

摘要

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,we investigate different relaying selections of a dual-hop full-duplex multiple-relay system taking into account energy-constrained relays.In the considered network,the amplify-and-forward (AF) protocol is adopted at relay,and the relay forwards the source signal with the energy harvested from the source.The total communication consists of two phases,i.e.,energy harvesting and information transmission,which means that the time-switching architecture is adopted.In order to achieve a better trade-off between the performance and the complexity,three different relay selection schemes are studied in this paper,namely the optimal relay selection and the other two sub-optimal relay selection schemes.According to the proposed three schemes,we derive the exact expression and the lower bound of the outage probability,as well as the effective throughput of the system.Finally,the correctness of the theoretical analysis is verified by Monte-Carlo simulation,and the simulation results show that the performance of the optimal relay selection scheme achieves better performance than the other two schemes,yet its complexity is the highest.