全双工系统中基于最大加权和速率的信息与能量同传优化方案  

Optimal scheme for simultaneous wireless information and power transfer to maximize weighted sum rate in full-duplex systems

作　　者：谢显中[1] 陈九九[1] 扶渝茜 Xianzhong XIE Jiujiu CHEN Yuxi FU(Institute of Personal Communications, Chongqing University of Posts and Telecommunications, Chongqing 400065, Chin)

机构地区：[1]重庆邮电大学个人通信研究所,重庆400065

出　　处：《中国科学：信息科学》2017年第7期891-903,共13页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:61271259;61301123;61471076;61601070);重庆市教委科学技术研究项目(批准号:KJ130536;KJ-1600411);重庆市基础与前沿研究计划项目(批准号:CSTC2016jcyj A0455);长江学者和创新团队发展计划(批准号:IRT1299);重庆市科委重点实验室专项经费资助项目

摘　　要：针对目前全双工无线系统中信息与能量同传(SWIPT)方案存在的问题,本文提出了一种基于最大加权和速率(WSR)的多用户全双工系统SWIPT传输优化方案.与传统传输方案不同的是,该方案的接入点和各用户都工作在全双工模式,下行信道实现信息与能量同时传输,接收机将自干扰信号和互干扰信号都视为可利用的射频信号进行能量收集.为此,本文设计了最大化WSR为目标的时隙分配因子和功率分裂因子联合优化方案,进一步,利用等价条件及Lagrange乘子法得到最优时隙分配因子最优解的闭合表达式,提出了一种基于黄金分割法迭代来优化功率分裂因子的算法,证明了收敛性,并从理论上分析了复杂度.仿真实验结果证实本文方案和算法具有性能优势和较低复杂度.Aimed at resolving the existing problems of simultaneous wireless information and power transfer（SWIPT） schemes in full duplex wireless systems, this paper proposes an optimal scheme based on weighted sum rate（WSR） maximization in multiuser full-duplex systems. In contrast to the traditional scheme, both the access point and users in the scheme work in FD mode, and the downlink channel implements SWIPT. Additionally, the receiver considers self-interference signals and mutual interference signals as usable RF signals to harvest energy.Therefore, we have designed a joint optimization scheme for timeslot distribution factor and power splitting factor to maximize WSR. We derive the optimal solution closed form expression of the timeslot distribution factor by using equivalent conditions and the Lagrangian multiplier method, and propose an iterative algorithm based on a golden section search to optimize the power splitting factor. We also verify its convergence and analyze its complexity. Simulation results demonstrate that the algorithm and scheme proposed in this paper achieve better performance and lower complexity when compared to existing methods.

关 键 词：信息与能量同传 全双工 加权和速率 LAGRANGE乘子法 黄金分割法 

分 类 号：TN92[电子电信—通信与信息系统]