Practical Modeling and Beamforming for Intelligent Reflecting Surface Aided Wideband Systems

被引：78
作者：
Cai, Wenhao [1 ]
Li, Hongyu [1 ]
Li, Ming [1 ]
Liu, Qian [2 ]
机构：
[1] Dalian Univ Technol, Sch Informat & Commun Engn, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, Sch Comp Sci & Technol, Dalian 116024, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2020年 / 24卷 / 07期
基金：
中国国家自然科学基金;
关键词：
OFDM; Wideband; Resonant frequency; Array signal processing; RLC circuits; Numerical models; Surface impedance; Intelligent reflecting surface; phase shift model; wideband system; beamforming optimization; WIRELESS NETWORK;
D O I：
10.1109/LCOMM.2020.2987322
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
Intelligent reflecting surface (IRS) has emerged as a revolutionizing solution to enhance wireless communications by intelligently changing the propagation environment. Prior studies on IRS are based on an ideal reflection model with a constant amplitude and a variable phase shift. However, it is difficult and unrealistic to implement an IRS satisfying such ideal reflection model in practical applications. In this letter, we aim to investigate the phase-amplitude-frequency relationship of the reflected signals and propose a practical model of reflection coefficient for an IRS-aided wideband system. Then, based on this practical model, joint transmit power allocation of each subcarrier and IRS beamforming optimization are investigated for an IRS-aided wideband orthogonal frequency-division multiplexing (OFDM) system. Simulation results illustrate the importance of the practical model on the IRS designs and validate the effectiveness of our proposed model.
引用
收藏
页码：1568 / 1571
页数：4
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