无线电工程2026，Vol.56Issue(3)：444-453,10.DOI:10.3969/j.issn.1003-3106.2026.03.007
基于波束分裂效应的XL-MIMO近场宽带信道估计研究
Research on XL-MIMO Near-field Wideband Channel Estimation Based on Beam Splitting Effect
摘要
Abstract
Aiming at the channel estimation accuracy degradation caused by the Beam Split(BP)effect in Extremely Large-scale Multiple-Input Multiple-Output(XL-MIMO)near-field wideband systems for 6G wireless communication networks,a Bilinear Pattern Detection(BPD)algorithm is proposed based on subcarrier grouping and gridless optimization with the simplex method.Due to the BP effect in near-field wideband systems,the subcarriers of the wideband system are grouped,and the bilinear patterns of angle and distance for each subcarrier group are calculated.By jointly utilizing the bilinear pattern information of all subcarrier groups,the maximum response position of cross-subcarrier frequency-correlated energy is captured,and the Polar-domain Simultaneous Orthogonal Matching Pursuit(P-SOMP)algorithm is adopted to conduct preliminary estimation of the angle and distance parameters of channel paths under discrete grids.Considering that the angle and distance parameters of channel paths in actual wireless propagation have the characteristic of continuous values,discrete grid modeling inevitably introduces grid mismatch errors.Therefore,the simplex method is employed to perform gridless refined optimization on the preliminarily estimated path information.Simulation results show that the proposed algorithm can reduce the impact of the BP effect,and improve significantly the channel estimation performance in near-field wideband systems compared with the conventional BPD algorithm.关键词
超大规模多输入多输出/近场/波束分裂/单纯形法/信道估计Key words
XL-MIMO/near-filed/BP/simplex method/channel estimation分类
信息技术与安全科学引用本文复制引用
郭晓金,宋国军..基于波束分裂效应的XL-MIMO近场宽带信道估计研究[J].无线电工程,2026,56(3):444-453,10.基金项目
重庆市自然科学基金创新发展联合基金(中国星网)(CSTB2023NSCQ-LZX0114) Innovation and Development Joint Fund of Chongqing Municipal Natural Science Foundation(China Satellite Network)(CSTB2023NSCQ-LZX0114) （中国星网）
