基于高原地区的超大规模海量MIMO系统混合场信道估计  

Hybrid-field channel estimation for extreme large scale massive MIMO systems in plateau regions

作　　者：张钧鑫 彭秋云 张雨晨 黄欢 杨君楠 姜军 Zhang Junxin;Peng Qiuyun;Zhang Yuchen;Huang Huan;Yang Junnan;Jiang Jun(School of Information Science and Technology,Tibet University,Lhasa 850000,China;National Experimental Teaching Demonstration Center for Information Technology,Tibet University,Lhasa 850000,China)

机构地区：[1]西藏大学信息科学技术学院,西藏拉萨850000 [2]西藏大学信息技术国家级实验教学示范中心,西藏拉萨850000

出　　处：《网络安全与数据治理》2025年第3期32-38,共7页CYBER SECURITY AND DATA GOVERNANCE

基　　金：国家自然科学基金(62261051);西藏大学研究生高水平人才培养计划(2022-GSP-S103);2021年度武汉理工大学-西藏大学“西藏经济社会发展与高原科学研究共建创新基金”(lzt2021007)。

摘　　要：为了改善高原地区通信条件较差的情况,可以部署超大规模海量多输入多输出(Extreme Large scale massive Multiple-Input Multiple-Output,XL-MIMO)系统。高原地区地形复杂,存在许多建筑、山脉等散射体,这些散射体可能形成近场和远场混合的复杂信道环境。在这种环境中,散射体的分布可能既包括远离基站的远场区域,也包括靠近基站的近场区域。由此构建混合场信道模型,来描述和模拟复杂的混合场信道特征。其次,为了保证XL-MIMO系统的容量和性能,需要获取混合场信道准确的信道状态信息。为此,提出了一种两阶段的信道估计方案。通过仿真验证,发现所提出的两阶段混合场信道估计方案在不同信噪比、不同导频长度、不同路径参数下都具有更优的归一化均方误差,因此更适合应用于复杂环境中的XL-MIMO系统。To improve the poor communication conditions in high-altitude areas,it is possible to deploy an Extreme Large scale massive Multiple-Input Multiple-Output(XL-MIMO)system.The terrain in high-altitude areas is complex,with many buildings,mountains,and other scatterers that may form a complex channel environment with a mixture of near-field and far-field.In this environment,the distribution of scatterers may include both the far-field area far from the base station and the near-field area close to the base station.A hybrid-field channel model is thus constructed to describe and simulate the complex characteristics of the hybrid-field channel.Secondly,to ensure the capacity and performance of the XL-MIMO system,it is necessary to obtain accurate channel state information of the hybrid-field channel.To this end,a two-stage channel estimation scheme is proposed.Through simulation verification,it is found that the proposed two-stage hybrid field channel estimation scheme has better Normalized Mean Square Error under different signal-to-noise ratios,different pilot lengths,and different path parameters,making it more suitable for the application of XL-MIMO systems in the complex environment.

关 键 词：超大规模多输入多输出 信道估计 混合场 正交匹配追踪算法 信道稀疏度 

分 类 号：TN911.22[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]