文献类型：期刊文献

英文题名：Sum Rate Maximization for Reconfigurable Intelligent Surface-Aided SIM-RSMA System

作者：Liu, Chao[1];Qiao, Kaixuan[1];Jiang, Ruijie[1];Yuan, Weina[1]

机构：[1]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：30

起止页码：198

外文期刊名：IEEE COMMUNICATIONS LETTERS

收录：;EI(收录号：20254719559841);WOS:【SCI-EXPANDED(收录号:WOS:001644559900027)】；

语种：英文

外文关键词：Optimization; Metasurfaces; Reconfigurable intelligent surfaces; Fading channels; Interference; Downlink; Array signal processing; Quality of service; Transmitting antennas; Vectors; Alternate optimization; reconfigurable intelligent surface; rate splitting multiple access; stacked intelligent metasurface; sum-rate

摘要：Stacked Intelligent Metasurface (SIM)-aided Rate Splitting Multiple Access (RSMA) systems have attracted significant interest. However, severe blockage between the base station (BS) and users causes a pronounced performance drop. To address this challenge, this letter proposes a novel system design for downlink SIM-RSMA system assisted by Reconfigurable Intelligent Surface (RIS). To maximize user sum rate under the constraints of BS transmit power and quality of service (QoS) rate requirements, this letter customizes an alternate optimization (AO) algorithm based on the whale migration algorithm (WMA), iterative projection gradient ascent (IPGA) algorithm and Riemannian conjugate gradient (RCG) algorithm to achieve optimization results. Simulation results demonstrate the effectiveness of the proposed RIS-aided SIM-RSMA scheme and the improvement of user sum rate by the AO algorithm.