东南大学学报（英文版）2025，Vol.41Issue(2)：140-146,7.DOI:10.3969/j.issn.1003-7985.2025.02.002
智能超表面子阵辅助的毫米波多用户传输方案
Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray
摘要
Abstract
The deployment of reconfigurable intelligent sur-faces(RISs)can enhance the coverage ability of millimeter wave(mmWave)communication systems.However,the typical strong line-of-sight(LoS)far-field propagation be-tween a base station(BS)and an RIS reduces channel rank,thus affecting multiuser spatial multiplexing.To address this issue,we propose an RIS subarray-assisted mmWave mul-tiuser transmission scheme.To increase channel rank,RIS is divided into multiple subarrays with adjustable spacing,and the channel is modeled using a hybrid spherical-and planar-wave model.To minimize interuser interference,the RIS subarrays are deployed in the discrete Fourier transform(DFT)direction of the BS antenna array.To maximize sig-nal efficiency,the BS precoder,the RIS reflection coeffi-cients,and the user's combiner are jointly designed.Nu-merical simulations were conducted to verify the effective-ness of the proposed RIS subarray deployment strategy and the performance of the wireless transmission scheme.In a four-user equipment(UE)communication scenario in the mmWave band,the effective rank of the BS-RIS channel approaches full rank,and the spectral efficiency of each UE is improved by at least 3 bit/(s·Hz).关键词
毫米波/智能超表面/DFT码本/无线通信Key words
millimeter waves/reconfigurable intelligent sur-face(RIS)/discrete Fourier transform(DFT)codebook/wireless communications分类
电子信息工程引用本文复制引用
艾俊杰,陈伟聪,刘葭,蔡雪峰,唐万恺,金石..智能超表面子阵辅助的毫米波多用户传输方案[J].东南大学学报（英文版）,2025,41(2):140-146,7.基金项目
The National Natural Science Foundation of China(No.62261160576,62401137),the China Postdoctoral Science Founda-tion(No.BX20230065,2024M750421),the Natural Science Founda-tion of Jiangsu Province(No.BK20241281),the Jiangsu Excellent Post-doctoral Program(No.2023ZB476),the Fundamental Research Funds for the Central Universities(No.2242023K5003),the Youth Science&Technology Talents Lifting Project by JSAST(No.TJ-2022-083). （No.62261160576,62401137）
