中山大学学报（自然科学版）（中英文）2024，Vol.63Issue(1)：128-136,9.DOI:10.13471/j.cnki.acta.snus.2023B56
下行RIS-NOMA的用户集群方法
User clustering method for downlink RIS-NOMA
摘要
Abstract
In order to enhance the performance of downlink non-orthogonal multiple access(NOMA)communication systems assisted by reconfigurable intelligent surfaces(RIS)in scenarios with non-uniform user distribution,a distributed user clustering scheme for downlink NOMA assisted by RIS has been proposed.Firstly,the adaptive geometric distribution(AGD)clustering algorithm is utilized to cluster users into user clusters(UCs)and match RIS with each UC.Then,the fractional programming(FP)method is employed to transform non-convex maximization and rate problems into convex optimization problems.Finally,power allocation(PA)and passive beamforming(PB)are performed sequentially for users within UCs.Simulation results demonstrate that,compared to spectral clustering(SPC),K-means,Gaussian mixture model(GMM)clustering schemes and orthogonal mul-tiple access(OMA),the AGD scheme yields approximately 7%,14%,19%and 42%gains in power-to-spectral efficiency,while RIS contributes approximately 16%,19%,26%and 40%improvements in spectral efficiency.关键词
可重构智能表面/非正交多址/用户集群/分式规划Key words
reconfigurable intelligent surface/non-orthogonal multiple access/user clustering/fractional programming分类
信息技术与安全科学引用本文复制引用
彭艺,吴桐,杨青青..下行RIS-NOMA的用户集群方法[J].中山大学学报（自然科学版）（中英文）,2024,63(1):128-136,9.基金项目
国家自然科学基金(61761025) （61761025）
云南省计算机技术应用重点实验室项目(2021102) （2021102）
