重庆邮电大学学报（自然科学版）2023，Vol.35Issue(6)：1028-1037,10.DOI:10.3979/j.issn.1673-825X.202301040002
RIS辅助的无小区大规模MIMO系统中信道估计及谱效分析
Channel estimation and spectral efficiency analysis for RIS-aided cell-free massive MIMO systems
摘要
Abstract
Cell-Free massive multiple input multiple output(Cell-Free mMIMO)technique breaks the traditional cellular cell boundaries and fundamentally solves the inter-cell interference problem,thus significantly improving the system throughput.Meanwhile,the reconfigurable intelligent surface(RIS)made of metamaterials can achieve intelligent control of the radio-magnetic environments.An iterative channel estimation method based on tikhonov regularization(TR)is proposed for the RIS-aided Cell-Free mMIMO system based on the superimposed pilot(SP)multiplexing mode.Based on it,the the-oretical derivation of the system uplink spectral efficiency(SE)is performed.The optimal power allocation factor of the SP multiplexing mode is then investigated by maximizing the system SE.Simulation results show that the channel estimation method can effectively improve the system SE.关键词
无小区大规模多输入多输出/可重构智能表面/吉洪诺夫正则化/叠加导频/频谱效率Key words
cell-free mMIMO/reconfigurable intelligent surface/Tikhonov regularization/superimposed pilot/spectral effi-ciency分类
信息技术与安全科学引用本文复制引用
刘梦源,景小荣..RIS辅助的无小区大规模MIMO系统中信道估计及谱效分析[J].重庆邮电大学学报（自然科学版）,2023,35(6):1028-1037,10.基金项目
上海星思半导体有限责任公司横向课题(XS-CQ-001)The Transverse Research Project from Shanghai Xingsi Semiconductor Company with Limited Liability(XS-CQ-001) （XS-CQ-001）
