Joint time-domain tracking of channel and frequency offsets for MIMO OFDM systems

被引：28
|
作者：
Roman, T [1 ]
Enescu, M [1 ]
Koivunen, V [1 ]
机构：
[1] Aalto Univ, Signal Proc Lab, FIN-02015 Helsinki, Finland
来源：
WIRELESS PERSONAL COMMUNICATIONS | 2004年 / 31卷 / 3-4期
关键词：
MIMO OFDM; channel estimation; frequency offset; time-varying systems; extended Kalman filtering;
D O I：
10.1007/s11277-004-3826-6
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
In this paper we address the problem of joint channel and frequency offset estimation and tracking in multiple-input multiple-output (MIMO) OFDM systems for mobile users. The proposed method stems from extended Kalman filtering and is suitable for time-frequency-space selective channels. Separate offset for each MIMO channel branch is considered because of the mobility and rich scattering. The channel taps and the frequency offsets are estimated in time-domain while the equalization is performed in frequency domain. Simulation results demonstrate that the proposed method tracks time-varying channels and frequency offsets with high fidelity. Realistic channel models are used in mobile scenarios. The proposed time-domain approach has improved performance and robustness in comparison to purely frequency domain processing. Computational complexity is lower as well.
引用
收藏
页码：181 / 200
页数：20
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