基于全息RIS的太赫兹MIMO信道估计研究  

Research on THz MIMO Channel Estimation Based on Holographic RIS

作　　者：孙道远[1] 李涛[2] SUN Daoyuan;LI Tao(Department of Computer Information Engineering,Anhui Vocational&Technical College of Industry&Trade,Huainan Anhui 232001,China;School of Computer and Big Data Science,Jiujiang University,Jiujiang Jiangxi 332005,China)

机构地区：[1]安徽工贸职业技术学院计算机信息工程系,安徽淮南232001 [2]九江学院计算机与大数据科学学院,江西九江332005

出　　处：《长春工程学院学报（自然科学版）》2023年第4期25-31,共7页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：安徽省高等学校质量工程项目(2022cxtd015)。

摘　　要：基于全息通信研究的大背景,提出了可重构智能表面(RIS)的全息版本。推导出了全息RIS的光束模式,并通过分析表明,理想全息RIS的光束模式可以近似于具有更实用硬件架构的超密集RIS的光束模式;提出了一种闭环信道估计(CE)方案,是以有效估计表征全息RIS辅助的THz大规模MIMO系统的宽带信道;为了减少导频开销,利用THzMIMO信道在角域和延迟域中的双重稀疏性,引入了一种基于压缩感知的CE算法。仿真结果证明,全息RIS优于非全息RIS,提出的CE方案有效。A holographic version of Reconfigurable Intelligent Surface(RIS)is proposed in the background of holographic communication research,and the beam mode of the holographic RIS is derived.It is indicated from the analysis that the beam mode of ideal holographic RIS can be approximated to the beam mode of the ultra dense RIS with more practical hardware architecture.A closed-loop Channel Estimation(CE)scheme is proposed to effectively estimate and characterize the broadband channel of THz large-scale MIMO system assisted by holographic RIS.In order to reduce the pilot cost,a CE algorithm based on compressive sensing is introduced,which utilizes the dual sparsity of THz MIMO channels in the angular and delay domains.The simulation results show that holographic RIS is superior to non holographic RIS,and the proposed CE scheme is effective.

关 键 词：太赫兹通信 大规模MIMO 全息通信 压缩传感(CS) 信道估计 

分 类 号：TN929.5[电子电信—通信与信息系统]