Qian Zhang;Guanghui Luo;Zheng Dong;Fuhui Sun;Xiaoyan Wang;Ju Liu
{"title":"超对角线可重构智能表面增强型 NOMA 系统","authors":"Qian Zhang;Guanghui Luo;Zheng Dong;Fuhui Sun;Xiaoyan Wang;Ju Liu","doi":"10.1109/LWC.2024.3489718","DOIUrl":null,"url":null,"abstract":"In this letter, we investigate how the beyond-diagonal reconfigurable intelligent surface (BD-RIS) can enhance non-orthogonal multiple access (NOMA) systems. Specifically, we analyze the BD-RIS enhancement performance in terms of sum-rate maximization (SRM), asymptotic received signal-to-noise ratio (SNR), and quasi-degradation region of the channel. In general, the SRM problem is tricky due to the complex structure of the phase-shift matrix of the BD-RIS. To address the resulting problem, we develop an effective variable separation algorithm to optimize the precoding vector and phase-shift matrix for maximizing the multiuser sum rate. It is worth mentioning that our proposed algorithm is well-compatible with the phase-shift design of existing BD-RIS structures. Furthermore, we analyze the asymptotic SNR and derive the quasi-degradation condition in BD-RIS-assisted NOMA systems. Simulation results demonstrate that the BD-RIS can achieve a higher square law of SNR than the diagonal RIS (D-RIS), higher spectral efficiency compared to OMA and D-RIS systems, and a larger NOMA quasi-degradation region than D-RIS and systems without RIS.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"14 1","pages":"118-122"},"PeriodicalIF":4.6000,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Beyond-Diagonal Reconfigurable Intelligent Surface Enhanced NOMA Systems\",\"authors\":\"Qian Zhang;Guanghui Luo;Zheng Dong;Fuhui Sun;Xiaoyan Wang;Ju Liu\",\"doi\":\"10.1109/LWC.2024.3489718\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this letter, we investigate how the beyond-diagonal reconfigurable intelligent surface (BD-RIS) can enhance non-orthogonal multiple access (NOMA) systems. Specifically, we analyze the BD-RIS enhancement performance in terms of sum-rate maximization (SRM), asymptotic received signal-to-noise ratio (SNR), and quasi-degradation region of the channel. In general, the SRM problem is tricky due to the complex structure of the phase-shift matrix of the BD-RIS. To address the resulting problem, we develop an effective variable separation algorithm to optimize the precoding vector and phase-shift matrix for maximizing the multiuser sum rate. It is worth mentioning that our proposed algorithm is well-compatible with the phase-shift design of existing BD-RIS structures. Furthermore, we analyze the asymptotic SNR and derive the quasi-degradation condition in BD-RIS-assisted NOMA systems. Simulation results demonstrate that the BD-RIS can achieve a higher square law of SNR than the diagonal RIS (D-RIS), higher spectral efficiency compared to OMA and D-RIS systems, and a larger NOMA quasi-degradation region than D-RIS and systems without RIS.\",\"PeriodicalId\":13343,\"journal\":{\"name\":\"IEEE Wireless Communications Letters\",\"volume\":\"14 1\",\"pages\":\"118-122\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2024-11-04\",\"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/10742100/\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Wireless Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10742100/","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}
Beyond-Diagonal Reconfigurable Intelligent Surface Enhanced NOMA Systems
In this letter, we investigate how the beyond-diagonal reconfigurable intelligent surface (BD-RIS) can enhance non-orthogonal multiple access (NOMA) systems. Specifically, we analyze the BD-RIS enhancement performance in terms of sum-rate maximization (SRM), asymptotic received signal-to-noise ratio (SNR), and quasi-degradation region of the channel. In general, the SRM problem is tricky due to the complex structure of the phase-shift matrix of the BD-RIS. To address the resulting problem, we develop an effective variable separation algorithm to optimize the precoding vector and phase-shift matrix for maximizing the multiuser sum rate. It is worth mentioning that our proposed algorithm is well-compatible with the phase-shift design of existing BD-RIS structures. Furthermore, we analyze the asymptotic SNR and derive the quasi-degradation condition in BD-RIS-assisted NOMA systems. Simulation results demonstrate that the BD-RIS can achieve a higher square law of SNR than the diagonal RIS (D-RIS), higher spectral efficiency compared to OMA and D-RIS systems, and a larger NOMA quasi-degradation region than D-RIS and systems without RIS.
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.