JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2025, Vol. 60 ›› Issue (12): 1-10.doi: 10.6040/j.issn.1671-9352.0.2024.331

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Joint optimisation of beam formation and rate allocation for STAR-RIS assisted RSMA systems

PENG Yi1,2, LE Shuzhen1,2, YANG Qingqing1,2*, LI Hui1,2, WANG Jianming1,2   

  1. 1. School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650031, Yunnan, China;
    2. Yunnan Provincial Key Laboratory of Computer Science, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
  • Published:2025-12-10

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Abstract: In order to enhance the communication performance of downlink rate-split multiple access(RSMA)systems assisted by simultaneously transmissive and reflective intelligently reconfigurable surface(STAR-RIS)and to solve the problem of limited performance of non-orthogonal multiple access(NOMA)when the channel gains are close to each other.In this paper, we propose a method of joint beam formation and rate allocation optimization. Firstly, the optimization problem of maximizing the sum rate is constructed that sets the optimization parameters as the beam formation vector, the rate allocation vector, and the STAR-RIS transmitted and reflected beam formation matrices. And then we decompose the optimization problem into two sub-problems by block coordinate descent. We optimize the beam formation vector and the rate allocation vector by successive convex approximation, and the STAR-RIS transmission and reflection beamforming matrices are optimized based on fractional programming and semi-definite programming methods. Finally, the sum-rate maximization under the power condition is achieved by alternating iterations. The simulation results demonstrate that the proposed algorithm exhibits superior performance in comparison to the existing benchmark scheme, achieving an overall enhancement in system sum rate ranging from 28.0% to 37.3%.

Key words: RSMA, STAR-RIS, sum rate, power

CLC Number: 

  • TN929.5
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