Active RIS-Assisted Communication Systems With Discrete Phase Shifts

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-02-06 DOI:10.1109/LCOMM.2025.3538932

Zhaoying Mo;Yiyang Ni;Yaxuan Liu;Haitao Zhao;Longze Li;Yan Cai

引用次数: 0

Abstract

Reconfigurable intelligent surface (RIS) has made significant contributions to enhancing wireless coverage via the effective management of scattering radio environment. This letter centers on an active RIS-assisted communication system over Nakagami-m fading channels where the discrete phase shifter is taken into consideration. We first obtain the approximate expression of ergodic achievable rate. Analyzing the expression shows that 4-bit quantization can achieve over 99% of the performance of continuous phase shifts. We also make a comparison between active RIS and passive RIS. Our theoretical analysis illustrates that passive RIS outperforms active RIS for large numbers of RlS elements. The numerical results are consistent with our analysis results. Finally, we propose a low-complexity power allocation scheme to improve the system rate effectively.

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离散相移有源ris辅助通信系统

可重构智能表面（RIS）通过对散射环境的有效管理，为提高无线覆盖做出了重要贡献。这封信的中心是一个主动ris辅助通信系统在Nakagami-m衰落信道，其中考虑了离散移相器。首先得到遍历可达率的近似表达式。对表达式的分析表明，4位量化可以达到99%以上的连续相移性能。我们还对主动RIS和被动RIS进行了比较。我们的理论分析表明，对于大量的RlS元素，被动RIS优于主动RIS。数值计算结果与分析结果一致。最后，提出了一种低复杂度的功率分配方案，有效地提高了系统的速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

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.