System Outage Probability and Diversity Analysis of a SWIPT Based Two-Way DF Relay Network Under Transceiver Hardware Impairments  

作　　者：Guangyue Lu Zhipeng Liu Yinghui Ye Xiaoli Chu 

机构地区：[1]Shaanxi Key Laboratory of Information Communication Network and Security,Xi’an University of Posts and Telecommunications,Shaanxi 710061,China [2]Key Laboratory of Universal Wireless Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China [3]Department of Electronic and Electrical Engineering,University of Sheffield,U.K.

出　　处：《China Communications》2023年第10期120-135,共16页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China under Grant 62201451;in part by the Young Talent fund of University Association for Science and Technology in Shaanxi under Grant 20210121;in part by the Shaanxi provincial special fund for Technological innovation guidance(2022CGBX-29);in part by BUPT Excellent Ph.D.Students Foundation under Grant CX2022106.

摘　　要：This paper investigates the system outage performance of a simultaneous wireless information and power transfer(SWIPT)based two-way decodeand-forward(DF)relay network,where potential hardware impairments(HIs)in all transceivers are considered.After harvesting energy and decoding messages simultaneously via a power splitting scheme,the energy-limited relay node forwards the decoded information to both terminals.Each terminal combines the signals from the direct and relaying links via selection combining.We derive the system outage probability under independent but non-identically distributed Nakagami-m fading channels.It reveals an overall system ceiling(OSC)effect,i.e.,the system falls in outage if the target rate exceeds an OSC threshold that is determined by the levels of HIs.Furthermore,we derive the diversity gain of the considered network.The result reveals that when the transmission rate is below the OSC threshold,the achieved diversity gain equals the sum of the shape parameter of the direct link and the smaller shape parameter of the terminalto-relay links;otherwise,the diversity gain is zero.This is different from the amplify-and-forward(AF)strategy,under which the relaying links have no contribution to the diversity gain.Simulation results validate the analytical results and reveal that compared with the AF strategy,the SWIPT based two-way relaying links under the DF strategy are more robust to HIs and achieve a lower system outage probability.

关 键 词：decode-and-forward relay diversity gain hardware impairments simultaneous wireless information and power transfer system outage probability 

分 类 号：TN929.5[电子电信—通信与信息系统]