无线电工程2025，Vol.55Issue(10)：1954-1964,11.DOI:10.3969/j.issn.1003-3106.2025.10.002
透射反射一体化超表面辅助下的动态非正交联合资源配置
Dynamic Non-orthogonal Joint Resource Allocation Assisted by Integrated Transmission-Reflection Surfaces
摘要
Abstract
Recent advancements in Simultaneous Transmitting and Reflecting Reconfigurable Intelligent Surfaces(STAR-RIS)have highlighted their potential in enhancing downlink Non-Orthogonal Multiple Access(NOMA)transmission systems.Existing researches primarily focus on optimizing individual variables;however,due to the complex interdependencies among multiple variables,adjustments to one can significantly impact the optimal solutions of others.To address the discussion scarcity of multivariate simultaneous optimization,a comprehensive joint optimization scheme that iteratively enhances beamforming,phase shift matrix,and power allocation is proposed to achieve a global optimum for maximizing system sum rate.For beamforming optimization,Semidefinite Relaxation(SDR)is used to reformulate the non-convex problem into a Semidefinite Program(SDP),which is then solved with the CVX solver.Following a rank reduction process,the optimal beamforming vector is derived.The phase shift matrix optimization confronts the challenge of simultaneously managing amplitude and phase coupling.Here,the gradient descent method is applied to update the phase shift matrix with the optimization of STAR-RIS,iterating the objective function until convergence is achieved through normalization.Power allocation between less frequently researched user pairs is simplified as a sub-channel power allocation problem,a fair power allocation algorithm for sub-channels——Proportional Fairness-Water Filling(PF-WF)——is proposed.This approach introduces a proportional fairness index into the water-filling framework,thereby enhancing NOMA system throughput while balancing the fairness among user pairs.Simulation results demonstrate that the proposed joint optimization scheme significantly outperforms three other existing methodologies,leading to substantial improvements in system sum rate.关键词
非正交多址接入/同时透射和反射的智能可重构表面/资源配置/联合优化Key words
NOMA/STAR-RIS/resource allocation/joint optimization分类
信息技术与安全科学引用本文复制引用
王昊远,任才,李宗霖,周任远,田悦..透射反射一体化超表面辅助下的动态非正交联合资源配置[J].无线电工程,2025,55(10):1954-1964,11.基金项目
福建省自然科学基金面上项目(2023J011455)General Program of Fujian Provincial Natural Science Foundation of China(2023J011455) （2023J011455）
