Distributed Beamforming for Energy-Harvesting Relaying in Vehicular Networks  

作　　者：Yuxiang Liang Bing Li Rongqing Zhang Hongze Li Shengjie Zhao 

机构地区：[1]School of Software Engineering,Tongji University,Shanghai 201804,China [2]School of Electronics and Information Engineering,Tongji University,Shanghai 201804,China

出　　处：《Journal of Communications and Information Networks》2020年第2期160-167,共8页通信与信息网络学报（英文）

基　　金：This work was supported in part by National Key Research and Development Project under Grants 2017YFE0119300 and 2019YFB2102300;in part by National Natural Science Foundation of China under Grants 61936014 and 61901302;in part by Shanghai Aerospace Science and Technology(SAST)Innovation Fund under Grant SAST2019-091;part by Fundamental Research Funds for the Central Universities(China)under Grant 22120190218;Part of this work has been published in IEEE/CIC ICCC 2019[1].

摘　　要：Recently,battery capacity and charging speed have been the bottlenecks of mobile communication networks.Energy harvesting(EH)relaying has become a promising solution for green 5th generation mobile communication with the advancement of wireless power transfer technology.In this paper,we investigate EH relaying in vehicular networks and adopt distributed beamforming(DB)to enhance the reliability and capacity of EH relaying.To be more specific,we propose a DB solution based on the joint optimization of power-splitting(PS)factors.For amplify-and-forward relaying,to transform the optimization problem into a quasi-convex one,we apply the semidefinite relaxation(SDR)method so that we can effectively attain the global optimal solution,while the suboptimal DB solution with distributed optimal PS factor which only requires local channel state information is also proposed.For decode-and-forward relaying,to get the optimal PS factors,we set a signal-to-noise ratio threshold at the relays,which can reduce the system error rate caused by the poor transmission link.Simulation results demonstrate the efficiency of our proposed DB-based EH relaying scheme in vehicular networks.

关 键 词：vehicular networks energy-harvesting relay SWIPT power splitting distributed beamforming 

分 类 号：TN92[电子电信—通信与信息系统]