Channel Modeling and Performance Analysis of UAV-Enabled Communications With UAV Wobble

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-10-14 DOI:10.1109/LCOMM.2024.3480130

Yuhan Dou;Zhuxian Lian;Yajun Wang;Bibo Zhang;Hao Luo;Chuanjin Zu

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引用次数: 0

Abstract

Because of the influence of wind, unmanned aerial vehicles (UAVs) inevitably experience different degrees of wobble while flying. Considering the impact of effective apertures (EA) on the performance of array antennas, this letter proposes a channel model for UAV-enabled communication systems, which incorporates the UAV’s pitch and yaw, as well as the randomly varying EA caused by the UAV’s wobble and flight posture. The general expression for the average signal-to-noise ratio (ASNR) is derived based on this model. From this general expression, we derive a closed-form expression for the case when the receiver is located directly below the hovering UAV. In deriving this closed-form expression, a method for approximating the general expression using a finite power series is proposed. The numerical results show that even slight wobble of the UAV can severely degrade the performance of the communication system. Moreover, owing to the wobble, increasing the number of antenna elements does not narrow the beamwidth and can’t lead to a significant improvement in ASNR. Furthermore, we find that in a UAV-enabled communication system, neglecting the EA also results in a severe overestimation of the ASNR.

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考虑无人机抖动的无人机通信信道建模与性能分析

由于风的影响，无人机在飞行过程中不可避免地会出现不同程度的摆动。考虑到有效孔径（EA）对阵列天线性能的影响，本文提出了一种用于无人机通信系统的信道模型，该模型考虑了无人机的俯仰和偏航，以及无人机摆动和飞行姿态引起的随机变化的EA。在此基础上推导了平均信噪比的一般表达式。在此一般性表达式的基础上，推导出了接收机位于悬停无人机正下方情况下的封闭表达式。在推导这个封闭表达式时，提出了一种用有限幂级数逼近一般表达式的方法。数值计算结果表明，即使是微小的抖动也会严重降低通信系统的性能。此外，由于抖动的存在，增加天线单元的数量并不能使波束宽度变窄，也不能显著提高ASNR。此外，我们发现在支持无人机的通信系统中，忽略EA也会导致ASNR的严重高估。

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.