Phase and 3-D Placement Optimization for Rate Enhancement in RIS-Assisted UAV Networks

IF 4.6 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2023-03-30 DOI:10.1109/LWC.2023.3263224

Maham Misbah;Zeeshan Kaleem;Waqas Khalid;Chau Yuen;Abbas Jamalipour

引用次数: 5

Abstract

In this letter, we aim at improving the system sum-rate performance of an assisted aerial base station (ABS) network by considering use of reconfigurable intelligent surface (RIS). We jointly optimize the RIS phase shifts and ABS altitudes using the proposed conjugate gradient and particle swarm optimization (CG-PSO) scheme. Moreover, we divide the problem into sub-problems and solve them using an alternative optimization method. First, an optimal RIS phase shift is computed using the conjugate gradient (CG) under the fixed ABS altitude and varying transmit power. Finally, we find the optimal ABS altitude using particle swarm optimization (PSO), which results in improved sum rate under the optimized RIS phase shift. The results show that the CG-PSO scheme significantly improves the system sum rate compared to the baseline schemes.

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ris辅助无人机网络速率提升的相位和三维布局优化

在这封信中，我们旨在通过考虑使用可重构智能表面（RIS）来提高辅助空中基站（ABS）网络的系统和速率性能。我们使用所提出的共轭梯度和粒子群优化（CG-PSO）方案联合优化RIS相移和ABS高度。此外，我们将问题划分为子问题，并使用替代优化方法进行求解。首先，在固定的ABS高度和变化的发射功率下，使用共轭梯度（CG）计算最优RIS相移。最后，我们使用粒子群优化算法（PSO）找到了最佳ABS高度，在优化的RIS相移下，该算法提高了求和率。结果表明，与基线方案相比，CG-PSO方案显著提高了系统求和率。

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 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.