超大规模MIMO-OTFS系统上行辅助的下行信道估计方法  

Uplink assisted downlink channel estimation method of extra-large scale MIMO-OTFS system

作　　者：蒲旭敏 邓凯元 陈前斌[2] PU Xumin;DENG Kaiyuan;CHEN Qianbin(National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096 [2]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《物联网学报》2023年第4期28-38,共11页Chinese Journal on Internet of Things

基　　金：国家自然科学基金资助项目(No.61701062);中国博士后科学基金资助项目(No.2019M651649);江苏省博士后科研基金资助项目(No.2018K041c);重庆市教育委员会科学技术研究项目(No.KJQN202100649,No.KJQN202000612)。

摘　　要：针对超大规模多输入多输出(MIMO,multiple-input multiple-output)正交时频空间(OTFS,orthogonal time frequency space)系统,提出了一种适用于高速移动场景的低复杂度下行信道估计方法。不同于现有研究,该方法考虑了超大规模MIMO-OTFS系统显著的空间非平稳特性,基于可视路径区域提出了一种低复杂度的增强型稀疏正交匹配追踪算法,利用频分双工(FDD,frequency-division duplex)模式中上下行信道的映射关系实现上行辅助的下行信道估计。仿真结果表明,所提上行辅助的下行信道估计方法能够充分考虑信道非平稳特性,在降低计算复杂度的同时显著提高信道估计性能,并且在高速移动物联网场景下表现良好。A low complexity downlink channel estimation method for high-speed mobile scenarios was proposed for the extra-large scale multiple-input multiple-output(MIMO)orthogonal time-frequency space(OTFS)system.Different from the existing studies,the proposed method considers the significant spatial non-stationary characteristics of extra-large scale MIMO-OTFS system.Based on the visible path region,an enhanced sparse orthogonal matching pursuit(OMP)algorithm with low complexity was proposed,uplink-assisted downlink channel estimation was achieved using the mapping relationship between the uplink and downlink channels in the frequency-division duplex(FDD)mode.Simulation results show that the proposed uplink-assisted downlink channel estimation method can accurately represent the non-stationary of the system,and achieve significant improvement in the channel estimation performance while reducing the computational complexity,and still perform well in high-mobility IoT scenarios.

关 键 词：物联网 正交时频空间调制 超大规模多输入多输出 频分双工 信道估计 

分 类 号：TN929.5[电子电信—通信与信息系统]