Performance Analysis of IRS-Assisted Networks With Near- and Far-Field Effects

IF 7.1 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Vehicular Technology Pub Date : 2024-12-20 DOI:10.1109/TVT.2024.3510688

Di Yi;Hongtao Zhang

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引用次数: 0

Abstract

Existing research on performance analysis of intelligent reflecting surfaces (IRS) regularly assumes that the signal transmitted by the IRS is attenuated under far-field conditions. However, the transmission signal shows different characteristics as relative distance varying and the close-range attributes of IRS render existing performance analyses inapplicable. In this paper, a general channel model with a tractable boundary is characterized and the near- and far-field of IRS are distinguished by applying different power scaling laws (e.g. additive and multiplicative path loss) for transmission signal in the channel as well as utilizing Rayleigh distance to demarcate the fields, based on which we analyzed the performance of IRS-assisted networks. Specifically, the impact of IRS element size is modeled into the near- and far-field effects, which directly alters the near-field boundary and influences the receiving signal power of user equipment (UE). In addition, the conditional signal power distribution is characterized as a piecewise function based on the division of Rayleigh distance and the interference Laplace function is rederived accordingly. The numerical results analyze the impact of near- and far-field effects, as well as different IRS parameters, on coverage probability, which demonstrates the significant variation of network performance compared to the far-field assumption when system parameter changes.

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具有近场和远场效应的irs辅助网络性能分析

现有的智能反射面（IRS）性能分析研究通常假设其传输的信号在远场条件下是衰减的。然而，由于传输信号的相对距离变化和红外光谱的近距离特性，使得现有的性能分析不适用。本文对具有可处理边界的一般信道模型进行了表征，通过对信道中传输信号应用不同的功率标度规律（如加性和乘性路径损耗），并利用瑞利距离对场进行标定，区分了IRS的近场和远场，并在此基础上分析了IRS辅助网络的性能。具体来说，IRS元件尺寸的影响被建模为近场和远场效应，它们直接改变近场边界并影响用户设备（UE）的接收信号功率。此外，根据瑞利距离的划分，将条件信号功率分布表征为分段函数，并据此重新推导了干扰拉普拉斯函数。数值结果分析了近场和远场效应以及不同IRS参数对覆盖概率的影响，表明当系统参数变化时，网络性能与远场假设相比发生了显著变化。

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 Transactions on Vehicular Technology 工程技术-电信学

CiteScore

6.00

自引率

8.80%

发文量

1245

审稿时长

6.3 months

期刊介绍： The scope of the Transactions is threefold (which was approved by the IEEE Periodicals Committee in 1967) and is published on the journal website as follows: Communications: The use of mobile radio on land, sea, and air, including cellular radio, two-way radio, and one-way radio, with applications to dispatch and control vehicles, mobile radiotelephone, radio paging, and status monitoring and reporting. Related areas include spectrum usage, component radio equipment such as cavities and antennas, compute control for radio systems, digital modulation and transmission techniques, mobile radio circuit design, radio propagation for vehicular communications, effects of ignition noise and radio frequency interference, and consideration of the vehicle as part of the radio operating environment. Transportation Systems: The use of electronic technology for the control of ground transportation systems including, but not limited to, traffic aid systems; traffic control systems; automatic vehicle identification, location, and monitoring systems; automated transport systems, with single and multiple vehicle control; and moving walkways or people-movers. Vehicular Electronics: The use of electronic or electrical components and systems for control, propulsion, or auxiliary functions, including but not limited to, electronic controls for engineer, drive train, convenience, safety, and other vehicle systems; sensors, actuators, and microprocessors for onboard use; electronic fuel control systems; vehicle electrical components and systems collision avoidance systems; electromagnetic compatibility in the vehicle environment; and electric vehicles and controls.