{"title":"Robust Beamforming and Rate Optimization for RIS-Aided Symbiotic Radio Systems With RSMA","authors":"Yongjun Xu;Mingyang Wang;Yunjian Jia;Yi Jin;Ruiqian Ma;Yijie Mao;Chau Yuen","doi":"10.1109/LCOMM.2024.3451700","DOIUrl":null,"url":null,"abstract":"In this letter, we propose a robust beamforming and rate optimization algorithm to improve spectral efficiency and transmission robustness by applying rate-splitting multiple access (RSMA) in reconfigurable intelligent surface (RIS)-aided symbiotic radio systems. Specifically, RSMA is used to serve all primary receivers on the same spectrum resource. Then, we formulate an optimization problem to minimize the total transmit power via the phase shift matrix of RIS, the beamforming vector of the base station, and the common rate parameter. To deal with this non-convex problem, we present an iteration-based optimization algorithm based on successive convex approximation and the alternating optimization method. Simulation results demonstrate that the proposed algorithm has 17.2% reduction in transmission power and 6.58% increase in the common rate compared to the other algorithms.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 10","pages":"2328-2332"},"PeriodicalIF":3.7000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10659020/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"TELECOMMUNICATIONS","Score":null,"Total":0}
引用次数: 0
Abstract
In this letter, we propose a robust beamforming and rate optimization algorithm to improve spectral efficiency and transmission robustness by applying rate-splitting multiple access (RSMA) in reconfigurable intelligent surface (RIS)-aided symbiotic radio systems. Specifically, RSMA is used to serve all primary receivers on the same spectrum resource. Then, we formulate an optimization problem to minimize the total transmit power via the phase shift matrix of RIS, the beamforming vector of the base station, and the common rate parameter. To deal with this non-convex problem, we present an iteration-based optimization algorithm based on successive convex approximation and the alternating optimization method. Simulation results demonstrate that the proposed algorithm has 17.2% reduction in transmission power and 6.58% increase in the common rate compared to the other algorithms.
期刊介绍：
The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. 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 communication systems.
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