超大规模混合场MIMO去伪峰信道估计技术  

Channel Estimation Technique for Eliminating Spurious Peaks in Ultra-Massive Hybrid-Field MIMO

作　　者：李汀[1] 张春洁 夏雨婷 LI Ting;ZHANG Chunjie;XIA Yuting(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《信号处理》2023年第6期1131-1140,共10页Journal of Signal Processing

基　　金：国家自然科学基金面上项目(62271265,61871238,62271266)。

摘　　要：超大规模MIMO(Multiple-Input Multiple-Output)是6G移动通信的潜在关键技术。在现有的信道模型中,大多假设所有的散射体要么都在远场区域,采用基于平面波假设的远场信道模型;要么都在近场区域,采用基于球面波假设的近场信道模型。实际中,超大规模MIMO系统更容易产生混合场的信道环境,现有的信道模型并不能很好地匹配这种远场近场混合信道的特征,因此不能直接采用现有的信道估计方案。本文对混合场信道进行建模,针对混合场信道空间谱中出现的伪峰问题,提出了一种去伪峰混合场信道估计方案。同时,该方案的设计也考虑了超大规模MIMO天线阵列的空间非平稳问题。仿真结果表明,本文提出的混合场下去伪峰的信道估计方案有较好的信道估计性能。Ultra-massive MIMO(Multiple-Input Multiple-Output)is a potential key technology for 6G mobile communications.Most of the existing channel models assume that all the scatterers are in the far-field region,and adopt the far-field channel model based on the plane wave assumption;Or they are all in the near-field region,using the near-field channel model based on the spherical wave hypothesis.In practice,ultra-massive MIMO systems are more likely to produce hybridfield channel environments.Existing channel models cannot match the characteristics of this far-field and near-field mixed channel well,so existing channel models and channel estimation schemes cannot be directly used.In this paper,the hybrid-field channel was modeled.Aiming at the problem of spurious peaks in the spatial spectrum of the hybrid-field channel,a channel estimation scheme was proposed to eliminate the spurious peaks.At the same time,this scheme also took into account the spatial non-stationary problem of the ultra-massive MIMO antenna array.Simulation results show that the proposed channel estimation scheme for eliminating spurious peaks in ultra-massive hybrid-field MIMO systems has better channel estimation performance.

关 键 词：信道估计 超大规模多输入多输出系统 混合场效应 伪峰效应 

分 类 号：TN929.5[电子电信—通信与信息系统]