2017206-1
研究与开发
基于扩展卡尔曼滤波的 MIMO 迭代信道估计方法
李明富
1
,廖勇
2
,沈轩帆
2
(1. 成都航空职业技术学院科技处,四川 成都 610100;
2. 重庆大学通信与测控中心,重庆 400044)
摘 要:针对高速移动场景下信道快衰落、非平稳等特性导致下行链路信道估计性能受限的问题,提出
了一种适用于高速移动环境下行链路的 MIMO 信道估计方法。采用自回归过程对信道建模,构造自反馈
的扩展卡尔曼滤波器(EKF)追踪信道响应及其时域相关系数。采用迭代接收机的结构解决了在 MIMO
环境下观测方程欠定的问题。仿真结果表明,在高速移动环境下所提方法相较于最小二乘估计等传统方
法提升了信道估计的均方误差和系统的误码率性能,可应用于高速列车无线通信设备的接收机基带信号
处理系统。
关键词:MIMO;OFDM;高速移动;非平稳信道估计;扩展卡尔曼滤波器
中图分类号:TN911 文献标识码:A
doi: 10.11959/j.issn.1000-0801.2017206
MIMO iterative channel estimation based
on extended Kalman filter
LI Mingfu
1
, LIAO Yong
2
, SHEN Xuanfan
2
1. Science and Technology Department of Chengdu Aeronautic Vocational and Technical College, Chengdu 610100, China
2. Center of Communication and TT&C, Chongqing University, Chongqing 400044, China
Abstract: In high-speed environment, fast fading and non-stationary limits the channel estimation performance, so a
channel estimation method for high-speed mobility in MIMO downlink was proposed. A self-feedback extended
Kalman filter (EKF) was set up to track the channel response and correlation parameters. An iterative detector & de-
coder receiver was adopted to deal with the problem that the observation equation is an underdetermined equation.
The simulation results show that compared with least squares(LS) in high speed environment, the proposed method
improves the channel estimation accuracy and performance of whole system. And it could be applied in baseband
signal processing of wireless receiver in high-speed train.
Key words: multiple input multiple output, orthogonal frequency division multiplexing, high-speed mobility,
non-stationary channel estimation, extended Kalman filter
收稿日期:2017-04-01;修回日期:2017-06-28
基金项目:国家自然科学基金资助项目(No.61501066);重庆市基础与前沿研究计划基金资助项目(No.cstc2015jcyjA40003);
中央高校基本科研业务费重点基金资助项目(No.106112017CDJXY500001);人工智能四川省重点实验室开放基金资助项目
(No.2012RYJ07)
Foundation Items: The National Natural Science Foundation of China (No.61501066), Chongqing Research Program of Basic Research an
Frontier Technology (No.cstc2015jcyjA40003), The Fundamental Research Funds for the Central Universities (No.106112017CDJXY500001),
The Open Fund of Key Laboratory of Artificial Intelligence of Sichuan Province (No.2012RYJ07)