硬件损伤下能量采集双向中继网络系统中断性能分析

System Outage Performance of Energy Harvesting Enabled Two-Way Relaying with Hardware Impairments

在硬件损伤条件下分析了能量采集双向中继网络的系统中断性能,该网络的终端节点对直达链路信号和中继链路信号分别进行选择合并(Selection Combining,SC)和最大比合并(Maximum Ratio Combining,MRC)。首先,推导了该网络在SC方案下的系统中断概率,并在此基础上得到了由硬件损伤而引起的两种效应,即中继协作效应和系统协作效应。然后,推导了该网络在MRC方案下的系统中断概率。最后,通过仿真分析了硬件损伤及系统参数对系统中断性能的影响,并比较了该网络在SC方案和MRC方案下的系统中断性能。仿真结果表明:在硬件损伤条件下,MRC方案仅引起系统协作效应;相比于MRC方案,SC方案对硬件损伤更加敏感;当数据传输速率低于系统协作门限时,采用MRC能够实现更好的系统中断性能。

This paper studies the system outage performance of a energy harvesting based two way relay network(TWRN)considering transceiver hardware impairments(HIs),where the terminals process the signals from direct and relaying links via the selection combining(SC)and maximum ratio combining(MRC)schemes respectively.The system outage probability under the SC scheme is derived.Based on the expression,the paper identifies two crucial effects on the system outage performance caused by HIs,i.e.,relay cooperation effect and system cooperation effect.Furthermore,the paper obtains the expression for the system outage probability under the MRC scheme.Finally,computer simulations are provided to study the effects of various system parameters on the system outage performance,and compare the performance gaps between the SC and MRC schemes.The simulation results are as follows.The TWRN with the MRC scheme only occurs system cooperation effect caused HIs;The SC scheme is more sensitive to HIs than the MRC scheme;When the data rate is smaller than system cooperation thresholds,the MRC scheme can achieve higher system outage performance than the SC scheme.