Optimal Elevation and Azimuth Rotation for RIS-Assisted Wireless Transmission

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-10-10 DOI:10.1109/LCOMM.2024.3477957

Shuqing Xu;Haiyan Guo;Wen Dong;Bin Lyu

引用次数: 0

Abstract

In this letter, we propose to optimize the rotation of reconfigurable intelligent surface (RIS) in both elevation and azimuth dimensions for further improving the RIS-assisted wireless transmission performance. Considering a mobile multi-user scenario, we first derive the upper bound of the ergodic sum-rate and the normalized radiation intensity of RIS after rotation in both elevation and azimuth dimensions. On this basis, we formulate the optimization problem with respect to the two rotation angles for the sake of maximizing the cascaded path gain, and derive the optimal solutions in closed form. Furthermore, we extend the optimal two-dimensional rotation (2DR) scheme to the scenario where multi-hop RISs assist wireless communication. Our simulation results verify the correctness of our derivation and show that our proposed 2DR scheme leads to a significantly higher ergodic sum-rate as compared to the single-elevation rotation (SER) scheme and no rotation (NR) scheme.

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ris辅助无线传输的最佳仰角和方位旋转

在这封信中，我们建议在仰角和方位角两个维度上优化可重构智能表面（RIS）的旋转，以进一步提高RIS辅助的无线传输性能。考虑到移动多用户场景，我们首先在仰角和方位角两个维度上推导了RIS旋转后遍历和速率和归一化辐射强度的上界。在此基础上，以最大化级联路径增益为目标，对两个转角的优化问题进行了表述，并以封闭形式导出了最优解。此外，我们将最优二维旋转（2DR）方案扩展到多跳RISs辅助无线通信的场景。我们的仿真结果验证了我们推导的正确性，并表明与单高程旋转（SER）方案和无旋转（NR）方案相比，我们提出的2DR方案具有显着更高的遍历和速率。

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.