{"title":"Sum Rate Maximization for Cooperative STAR-RISs Aided NOMA System","authors":"Peiyu Wang;Wei Wu;Hong Wang;Rongfang Song","doi":"10.1109/LWC.2025.3532027","DOIUrl":null,"url":null,"abstract":"Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) has received substantial attentions due to its capability of constructing the intelligent wireless communication environment. This letter investigates cooperative STAR-RISs assisted non-orthogonal multiple access (NOMA) system under near-field and far-field scenarios. Specifically, a sum rate maximization problem is constructed by optimizing the phase shifts, amplitude coefficients, and power allocation. Furthermore, a low complexity algorithm is proposed to optimize the phase shifts and amplitude coefficients individually. The amplitude coefficients of reconfigurable elements are obtained by transforming the original problem to a convex problem. A geometry programming (GP) method is invoked to solve the power allocation problem. Simulation results show that the proposed cooperative-STAR-RISs aided NOMA method has the capability of enhancing sum rate compared with various benchmark schemes.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"14 5","pages":"1291-1295"},"PeriodicalIF":5.5000,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Wireless Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10847902/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"COMPUTER SCIENCE, INFORMATION SYSTEMS","Score":null,"Total":0}
引用次数: 0
Abstract
Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) has received substantial attentions due to its capability of constructing the intelligent wireless communication environment. This letter investigates cooperative STAR-RISs assisted non-orthogonal multiple access (NOMA) system under near-field and far-field scenarios. Specifically, a sum rate maximization problem is constructed by optimizing the phase shifts, amplitude coefficients, and power allocation. Furthermore, a low complexity algorithm is proposed to optimize the phase shifts and amplitude coefficients individually. The amplitude coefficients of reconfigurable elements are obtained by transforming the original problem to a convex problem. A geometry programming (GP) method is invoked to solve the power allocation problem. Simulation results show that the proposed cooperative-STAR-RISs aided NOMA method has the capability of enhancing sum rate compared with various benchmark schemes.
同时发射和反射可重构智能表面（STAR-RIS）因其构建智能无线通信环境的能力而受到广泛关注。本文研究了近场和远场场景下合作STAR-RISs辅助非正交多址（NOMA）系统。具体而言，通过优化相移、振幅系数和功率分配，构建了一个和速率最大化问题。在此基础上，提出了一种低复杂度的相移系数和幅值系数分别优化算法。将原问题转化为一个凸问题，得到可重构单元的振幅系数。采用几何规划（GP）方法求解电力分配问题。仿真结果表明，与各种基准方案相比，所提出的协同- star - riss辅助NOMA方法具有提高和速率的能力。
期刊介绍：
IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.
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