Ergodic Rate Analysis of STAR-RIS Aided NOMA Systems

被引：48

作者：

Zhao, Boqun ^{[1
]}

Zhang, Chao ^{[2
]}

Yi, Wenqiang ^{[2
]}

Liu, Yuanwei ^{[2
]}

机构：

[1] Imperial Coll London, Dept Elect & Elect Engn, London SW7 2AZ, England

[2] Queen Mary Univ London, Sch Elect Engn & Comp Sci, London E1 4NS, England

来源：

IEEE COMMUNICATIONS LETTERS | 2022年 / 26卷 / 10期

关键词：

NOMA; Signal to noise ratio; Protocols; Interference cancellation; Gamma distribution; Fading channels; Quality of service; STAR-RIS; ergodic rate; high SNR slope;

D O I：

10.1109/LCOMM.2022.3194363

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

This letter analyzes the ergodic rates of a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) aided non-orthogonal multiple access (NOMA) system, where the direct links from the base station to cell-edge users are non-line-of-sight due to obstacles, and STAR-RIS is used to provide line-of-sight links to these cell-edge users. By fitting the distribution of the composite channel power gain to a gamma distribution, we derive the closed-form expressions of ergodic rates and high signal-to-noise ratio (SNR) slopes for cell-edge users. Numerical results reveal that 1) the ergodic rates increase with the number of STAR-RIS elements, and the high SNR slopes are fixed as constants; 2) STAR-RIS aided NOMA systems achieve higher ergodic rates than conventional RIS aided NOMA systems.

引用

页码：2297 / 2301

页数：5

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