BD-RIS-Aided RSMA-ISAC Systems: Joint Rate Splitting and Beamforming Design

作者：Ying Xie, Liping Li, Yingsong Li, Liang Yang, Xingwang Li, Ali Ghrayeb · 发表于：IEEE Communications Letters · 年份：2025 · 被引用次数：5 · 研究领域：Advanced Wireless Communication Technologies、Advanced Antenna and Metasurface Technologies、Underwater Vehicles and Communication Systems

An integrated sensing and communication (ISAC) system with a fully connected beyond-diagonal reconfigurable intelligent surface (BD-RIS) and rate splitting multiple access (RSMA) is investigated. To maximize the sum rate of multiple users while meeting sensing quality requirements, we jointly optimize the active beamforming at the base station and the reflective beamforming at the BD-RIS. The nonconvex optimization problem is addressed using an alternating algorithm based on weighted minimum mean square error (WMMSE), penalty-dual-decomposition (PDD), and successive convex approximation (SCA). Simulation results validate the benefits of the proposed scheme and the performance gains from deploying BD-RIS in RSMA-ISAC systems.