超对角线可重构智能表面增强型 NOMA 系统

IF 4.6 3区 计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS
Qian Zhang;Guanghui Luo;Zheng Dong;Fuhui Sun;Xiaoyan Wang;Ju Liu
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引用次数: 0

摘要

在这篇文章中,我们研究了超对角线可重构智能表面(BD-RIS)如何增强非正交多址(NOMA)系统。具体来说,我们从和率最大化(SRM)、渐近接收信噪比(SNR)和信道准退化区域三个方面分析了BD-RIS增强性能。一般来说,由于BD-RIS相移矩阵结构复杂,SRM问题比较棘手。为了解决由此产生的问题,我们开发了一种有效的变量分离算法来优化预编码向量和相移矩阵,以最大化多用户和速率。值得一提的是,我们提出的算法与现有BD-RIS结构的相移设计具有很好的兼容性。进一步,我们分析了bd - ris辅助NOMA系统的渐近信噪比,并推导了系统的准退化条件。仿真结果表明,BD-RIS比对角RIS (D-RIS)具有更高的信噪比平方律,比OMA和D-RIS系统具有更高的频谱效率,比D-RIS和无RIS系统具有更大的NOMA准退化区域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.
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来源期刊
IEEE Wireless Communications Letters
IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering
CiteScore
12.30
自引率
6.30%
发文量
481
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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