多天线FD-SWIPT中继信道下功率分裂和波束成形的联合优化  

Joint optimization of power splitting and beamforming for multi-antenna FD-SWIPT relaying

作　　者：扶渝茜 谢显中[1] 陈九九[1] FU Yuxi;XIE Xianzhong;CHEN Jiujiu(Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, P.R.China)

机构地区：[1]重庆邮电大学个人通信研究所,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2017年第5期649-656,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61271259;61601070);重庆市教委科学技术研究项目(KJ1600411);重庆市基础与前沿研究计划项目(CSTC 2016jcyj A0455)~~

摘　　要：设计了多天线全双工(full-duplex,FD)中继信道下联合优化功率分裂因子和波束成形矩阵的能量与信息同传(simultaneous wireless information and power transfer,SWIPT)算法。不同于现有的FD-SWIPT方案,考虑较为复杂的多天线中继系统,并用功率分裂(power splitting,PS)代替传统的时间切换(time switching,TS),使得信息传输和能量采集过程可以同时进行。给出了基于迫零算法(zero-forcing algorithm,ZF)的波束成形方案,研究了系统低复杂度的次优解,其中波束成形的使用增强了能量采集和回路自干扰抑制的能力,从而达到更大的吞吐量。还优化了PS,并利用二次插值法求出最优的PS因子,最终得到整个系统的次优解。仿真结果表明,联合优化方案可以提升系统的最大吞吐量,另外,PS因子的选择对系统吞吐量起着至关重要的作用,同时这2个优化因子都与发射功率的大小有关。The algorithm is proposed to optimize the power splitting factor and beamforming matrix under multi antenna FD-SWIPT relay channel.First of all,unlike the existing FD-SWIPT schemes,this paper considers the more complex multi antenna relay system model,and adopts power splitting(PS)protocol instead of the traditional time switching(TS)protocol,so that the information transfer and energy harvesting can be carried out at the same time.Secondly,we give a beamforming scheme based on the zero forcing algorithm(ZF),and study the suboptimal solution of the system with low complexity.The use of beamforming technology enhances the ability of energy harvesting and loop self interference suppression,so as to achieve larger throughput.Furthermore,the PS protocol is optimized,and the optimal PS factor is obtained by quadratic interpolation method.Finally,the suboptimal solution of the whole system is obtained.The simulation results show that the proposed joint optimization scheme can improve the maximum throughput of the system.In addition,the design of PS factor plays an important role in transient throughput,and they are related to the transmitted power.

关 键 词：全双工中继 信息与能量同传 迫零算法 波束成形 功率分裂 时间切换 

分 类 号：TN925[电子电信—通信与信息系统]