有源RIS辅助速率分割多址系统的资源分配方案  

A Resource Allocation Scheme for Active RIS-assisted Rate Splitting Multiple Access System

作　　者：周围[1,2] 黎飞雨 余明明 向曾 陈黎 ZHOU Wei;LI Feiyu;YU Mingming;XIANG Ceng;CHEN Li(School of Optoelectronics Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,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：《电讯技术》2024年第10期1628-1635,共8页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(61701062);重庆市基础与前沿研究计划项目(cstc2019jcyj-msxmX0079)。

摘　　要：针对无源智能反射面(Passive Reconfigurable Intelligent Surface,PRIS)所带来的“双衰落”效应及传统多址接入方案在干扰管理上的缺陷,提出了一种有源智能反射面(Active Reconfigurable Intelligent Surface,ARIS)辅助速率分割多址(Rate Splitting Multiple Access,RSMA)的系统方案。该方案中,构建了一个以最大化用户最小速率为目标的优化问题。该问题是一个多变量耦合的非凸问题,为此提出了一种具有公平性的资源分配算法,在ARIS硬件约束、公共信息速率约束等条件下,将原优化问题拆分为基站波束赋形矢量和速率分割因子的联合优化、ARIS的预编码矩阵优化两个子问题,随后使用逐次凸逼近、半正定松弛和凸差函数对非凸约束进行转换,并利用交替优化方法迭代求解。理论分析和仿真结果表明,在系统总功率为30 dBm的情况下,所提方案的用户最小速率相比传统PRIS辅助RSMA方案提升了18.6%。To address the“double fading”effect caused by passive reconfigurable intelligent surfaces(PRIS)and the shortcomings of traditional multiple access schemes in interference management,an active reconfigurable intelligent surfaces(ARIS)-aided rate splitting multiple access(RSMA)system scheme is adopted.In this scheme,an optimization problem is formulated with the objective of maximizing the minimum user rate.Since this problem is a non-convex one with coupled multivariable constraints,a fairness-oriented resource allocation algorithm is proposed.Considering the hardware constraints of ARIS and the common information rate constraints,the original optimization problem is decomposed into two subproblems:joint optimization of the base station beamforming vectors and rate splitting factors,and optimization of the ARIS precoding matrix.Successive convex approximation,semidefinite relaxation,and difference of convex functions are then employed to transform the non-convex constraints,and an alternating optimization method is used to iteratively solve the problem.Theoretical analysis and simulations results show that under a total system power of 30 dBm,the proposed scheme improves the minimum user rate by 18.6%compared with the traditional PRIS-aided RSMA scheme.

关 键 词：速率分割多址(RSMA)系统 有源智能反射面 资源分配 

分 类 号：TN929.5[电子电信—通信与信息系统]