基于导频和修正Kalman滤波的MIMO-OFDM信道估计方法

doi:1000-436X(2007)02-0023-06

通信学报 ›› 2007, Vol. 28 ›› Issue (2): 23-28.doi: 1000-436X(2007)02-0023-06

基于导频和修正Kalman滤波的MIMO-OFDM信道估计方法

宋铁成,尤肖虎,沈连丰,宋晓晋

东南大学移动通信国家重点实验室，江苏南京210096

出版日期:2007-02-25 发布日期:2017-08-03
基金资助:
国家自然科学基金资助项目;江苏省自然科学基金资助项目;江苏省高技术研究开发项目

Channel estimation method for MIMO-OFDM systems based on pilots and modified Kalman filter

Tie-cheng SONG,Xiao-hu YOU,Lian-feng SHEN,Xiao-jin SONG

National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China

Online:2007-02-25 Published:2017-08-03
Supported by:
The National Natural Science Foundation of China;The Natural Science Foundation of Jiangsu Province;The High Technology Research and Development Program of Jiangsu Province

摘要/Abstract

摘要：

提出了一种适用于时间频率选择性衰落信道的MIMO-OFDM 系统的组合信道估计方法。采用 AR 过程对信道进行建模，利用基于导频的低维Kalman滤波算法进行信道估计，并采用LS算法估计时变的信道衰减因子。Kalman滤波跟踪了信道的时域相关性，为了同时跟踪信道的频域相关性，采用了一种基于MMSE (minimum mean square error)的合并器对Kalman滤波算法进行修正。仿真表明，提出的这种组合算法降低了传统的Kalman滤波结构的复杂度，能够跟踪信道的时频变化，改进了基于LS准则的信道估计算法，并且与复杂的高维Kalman滤波

关键词: MIMO-OFDM, 信道估计, Kalman, LS, MMSE合并器

Abstract:

A combined channel estimation method of time-frequency-selective fading channels in MIMO-OFDM systems was proposed.The time-varying channel was modeled as an autoregressive (AR) process and a low-dimensional Kalman filter based on pilots was used to estimate the AR parameters,and the LS(least square) algorithm was adopted to track the time-varying channel fading factors.The Kalman estimator explored the time-domain correlation of the channel,and a minimum mean square error (MMSE) combiner was used to modify the Kalman estimates.The proposed solution could reduce the complexity of the high-dimensional Kalman filter and track the channel both in frequency and time domains.The simulation results show that this method improves the LS estimates and has a comparable performance to the complex high-dimensional Kalman channel estimation method.

Key words: MIMO-OFDM, channel estimate, Kalman, least square, MMSE combiner

宋铁成,尤肖虎,沈连丰,宋晓晋. 基于导频和修正Kalman滤波的MIMO-OFDM信道估计方法[J]. 通信学报, 2007, 28(2): 23-28.

Tie-cheng SONG,Xiao-hu YOU,Lian-feng SHEN,Xiao-jin SONG. Channel estimation method for MIMO-OFDM systems based on pilots and modified Kalman filter[J]. Journal on Communications, 2007, 28(2): 23-28.

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	室外车载环境 v=20m/s
相对时延/ns	平均功率/dB
0	0.0
310	?1.0
710	?9.0
1 090	?10.0
1 730	?15.0
2 510	?20.0

基于导频和修正Kalman滤波的MIMO-OFDM信道估计方法

Channel estimation method for MIMO-OFDM systems based on pilots and modified Kalman filter

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