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arXiv · 2610.14765

Sum Rate Maximization for Practical RIS-Enhanced Rate-Splitting Multiple Access Systems

Qian Zhang·Xuejun Cheng·Jiaming Shi·Yufei Zhao·Rugui Yao·Ye Fan
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Abstract

Reconfigurable intelligent surfaces (RIS) combined with rate-splitting multiple access (RSMA) provide a promising solution for improving the spectral efficiency (SE) of sixth-generation (6G) communication systems. However, most existing studies neglect the practical coupling between the RIS phase shift and amplitude, which may cause phase-shift mismatch and significant performance loss. In this paper, we investigate the multiuser sum-rate maximization problem for practical RIS-enhanced RSMA systems considering amplitude-phase coupling. To address the resulting non-convex problem, an effective variable separation algorithm is proposed. The proposed algorithm is compatible with RIS reflecting optimization under the continuous phase shift or any amplitude-phase coupling relationship and can also be directly extended to practical RIS-enhanced NOMA and OMA systems. Simulation results demonstrate performance gain of over 190\% compared with the ideal-RIS-based benchmark, while the proposed RSMA scheme significantly outperforms the corresponding NOMA and OMA schemes.

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Qian Zhang, Xuejun Cheng, Jiaming Shi, Yufei Zhao, Rugui Yao, Ye Fan. 2026-10-10. Sum Rate Maximization for Practical RIS-Enhanced Rate-Splitting Multiple Access Systems. https://arxiv.org/abs/2610.14765

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