Low-cost intelligent reflecting surface aided Terahertz multiuser massive MIMO:design and analysis  

作　　者：Guanghua YU Xiaoming CHEN Xiaodan SHAO Caijun ZHONG 

机构地区：[1]College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Science China(Information Sciences)》2021年第10期69-83,共15页中国科学（信息科学）（英文版）

基　　金：supported by National Key R&D Program of China(Grant No.2020YFB1805703);National Natural Science Foundation of China(Grant No.61871344);Zhejiang Provincial Natural Science Foundation of China(Grant No.LR20F010002)。

摘　　要：Terahertz(THz)multiuser massive multiple-input multiple-output(MIMO)has been envisioned as a promising technique to support massive connectivity in next-generation wireless networks.However,due to ultra-high frequency band,the path attenuation of THz channels is extremely severe,resulting in limited wireless coverage.In this paper,we propose an intelligent reflecting surface(IRS)-assisted THz multiuser massive MIMO technique to enhance coverage.First,we design an IRS-assisted THz communication framework with a low-cost sub-connected hybrid precoding architecture,including uplink data transmission and downlink data transmission.In particular,precoding errors due to the limitations of physical devices and environments are taken into consideration.Then,we derive the closed-form expressions for uplink and downlink spectral efficiencies,and reveal the impacts of system parameters.Finally,we conduct extensive simulations to verify the effectiveness of the proposed IRS-assisted THz multiuser massive MIMO technique.

关 键 词：THz communication IRS massive MIMO precoding error coverage enhancement 

分 类 号：TN929.5[电子电信—通信与信息系统]