Channel Estimation for Reconfigurable Intelligent Surface Assisted Terahertz Communication

被引：0
|
作者：
Li G. [1 ]
Du Y. [1 ]
Wang D. [1 ]
Liu X. [1 ]
机构：
[1] School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing
来源：
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | 2022年 / 45卷 / 06期
关键词：
Beam squint; Reconfigurable intelligent surface; Terahertz; Wideband channel estimation;
D O I：
10.13190/j.jbupt.2022-092
中图分类号：
学科分类号：
摘要：
The wideband channel estimation schemes in existing reconfigurable intelligent surface assisted communication systems only consider the frequency selectivity fading of the channel,while ignore the problem that the beam squint affects the system performance severely. Therefore,a distributed Dice subspace pursuit scheme based on a grouping strategy is proposed. First,the cascaded channel estimation problem is transformed into a sparse signal recovery problem by exploiting the sparsity of terahertz channels. Then,a wideband dictionary is designed, and a grouping strategy is proposed to solve the problem of beam squint. Finally,the Dice coefficient criterion and backtracking idea are introduced to optimize the selection of support set. The simulation results show that the proposed scheme can improve the accuracy of channel estimation compared with the traditional wideband channel estimation schemes. © 2022, Editorial Department of Journal of Beijing University of Posts and Telecommunications. All right reserved.
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页码：109 / 114
页数：5
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