可重构智能表面辅助多用户NOMA网络鲁棒资源分配  

Robust Resource Allocation for Reconfigurable Intelligent Surface-Assisted Multi-User NOMA Networks

作　　者：胡林 刘锡炎[1] 齐倩 陈前斌 HU Lin;LIU Xi-yan;QI Qian;CHEN Qian-bin(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Lab of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,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]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《电子学报》2024年第10期3359-3367,共9页Acta Electronica Sinica

基　　金：国家自然科学基金(No.U23A20279,No.61901089)。

摘　　要：在不完美信道状态信息(Channel State Information,CSI)和不完美串行干扰消除(Successive Interference Cancellation,SIC)的场景下,研究了可重构智能表面(Reconfigurable Intelligent Surface,RIS)辅助多用户非正交多址接入(Non-Orthogonal Multiple Access,NOMA)网络的鲁棒资源分配问题.在考虑两类用户(信息用户和能量用户)服务质量(Quality of Service,QoS)和信息用户SIC约束下,建立了基站发射功率最小化的优化问题.该问题是一个多变量耦合的非凸优化问题.为了求解该问题,本文使用松弛变量、线性近似、S-程序、符号定性法转化该问题的非凸约束.然后将优化问题分解为两个子问题,最后使用交替优化方法迭代求解两个子问题,直到发送功率收敛.仿真结果表明:该文算法具有较好的收敛性,实现了资源的鲁棒分配,同时有效地降低基站发射功率.In the scenario of imperfect channel state information(CSI)and imperfect successive interference cancellation(SIC),the problem of robust resource allocation in reconfigurable intelligent surface(RIS)assisted multi-user non-orthogonal multiple access(NOMA)is studied.Considering the constraints of two types of users(information user and energy user)quality of service(QoS)and information user SIC,a transmit power minimization problem is formulated.This optimization problem is a multi-variable coupled non-convex optimization problem.In this paper,the non-convex constraints of the problem are transformed by using relaxation variables,linear approximation,S-procedure,and sign-definiteness methods.Then,the optimization problem is decomposed into two sub-problems,Finally,the alternate optimization method is used to iteratively solve the above sub-problems.The simulation results show that the proposed approach has a good convergence behavior,realizes the robust allocation of resources and can effectively reduce the transmit power of the base station.

关 键 词：可重构智能表面 非正交多址接入 不完美信道状态信息 不完美串行干扰消除 传输功率优化 功率最小化 

分 类 号：TN929.5[电子电信—通信与信息系统]