IRS辅助的MISO-SWIPT安全速率最大化算法  

MISO-SWIPT security rate maximization algorithm based on IRS assistance

作　　者：曾凯洛 王婧琳 左琳立 张冬雪 ZENG Kailuo;WANG Jinglin;ZUO Linli;ZHANG Dongxue(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;School of Software Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;Chongqing College of Electronic Engineering,Chongqing 401331,P.R.China;School of Electronic Information,Chongqing Institute of Engineering,Chongqing 400056,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学软件工程学院,重庆400065 [3]重庆电子工程职业学院,重庆401331 [4]重庆工程学院电子信息学院,重庆400056

出　　处：《重庆邮电大学学报（自然科学版）》2023年第4期646-654,共9页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(62071077);重庆市教委科学技术研究项目(KJQN202200606);重庆市博士后研究项目特别资助(2112012725828262);中国人民解放军陆军工程大学通信士官学校“育英人才计划”。

摘　　要：为增强系统的稳定性,基于智能反射面(intelligent reflection surface,IRS)辅助安全通信,为用户采用功率分配架构的无线携能传输(simultaneous wireless information and power transfer,SWIPT)技术以提高用户安全速率并降低用户的能量消耗,建立了系统安全速率最大化的目标函数模型;考虑IRS相移约束、基站最大发射功率、功率分配比率约束和用户最低能量采集约束,提出了一种基于交替优化的安全速率最大化算法。利用连续凸近似算法,将目标函数转化为凸的形式;采用交替优化,对耦合变量进行解耦处理;提出一种波束赋形算法以实现安全速率最大化。仿真表明,提出的算法能够有效提升IRS辅助的SWIPT系统的安全速率,至少比其他算法提高了2.63bps/Hz。Based on intelligent reflection surface(IRS)auxiliary safety communication,the simultaneous wireless information and power transfer(SWIPT)technology using power distribution architecture for users aims to improve user’s safety rate while reducing user’s energy consumption to enhance the stability of the system.The objective function model of maximizing the system security rate is established.IRS phase shift constraint,base station maximum transmission power,power distribution ratio constraint and user minimum energy acquisition constraint are considered.A safe rate maximization algorithm based on alternate optimization is proposed.Because of variable coupling,the original problem cannot be solved directly.Firstly,the continuous convex approximation algorithm is used to transform the objective function into convex form.Secondly,alternate optimization is used to decouple the coupling variables.Finally,a beamforming algorithm is proposed.Simulation results show that the proposed beam-forming algorithm can effectively improve the security rate of IRS-assisted SWIPT system with at least 2.63bps/Hz improvement over other algorithms.

关 键 词：智能反射面 安全通信 波束赋形 无线携能通信 

分 类 号：TN918.91[电子电信—通信与信息系统]