射频能量采集双向中继系统的吞吐率分析

摘要

Network coding and energy harvesting are promising techniques that can improve the transmission efficiency and the energy efficiency of wireless systems,respectively. In this paper,we choose three nodes two-way relay systemas the observed system,then investigate the power splitting based relaying(PSR)protocol based on power splitting receiver architecture. Meanwhile,the amplify-and-forward(AF)relaying and decode-and-forward(DF)relaying methods are both discussed. In order to determine the throughput,the expressions of outage probability and the system throughput for each caseare derived. Through simulations,it is shown that DF relaying system outperforms AF relaying system in terms of both the outage probability and the throughput. Furthermore,it is shown network coding can bring a throughput gain up to 33％,the throughput gain is closely related to the value of noise variance.%网络编码技术和能量采集技术都是近几年比较热门的话题,它们分别提升了无线传输系统的信息传输效率和能量利用率.本文选取三节点双向中继系统为研究对象,观察了基于能量分配的中继策略Power Splitting Protocol(PSR).同时讨论了放大转发Amplify-and-forward(AF)和解码转发Decode-and-forward(DF)两种中继编码方式.为了计算系统的吞吐率,针对不同的情景分别推导出了系统的中断概率和吞吐率的表达式.通过仿真实验,可以看到DF中继系统在中断概率和吞吐率两方面均优于AF中继系统;并且,网络编码技术能够提升将近33％的系统吞吐率,该吞吐率增益与噪声方差紧密相关.