A simple channel estimator for space-time coded OFDM systems in rapid fading channels

A simple channel estimator for space-time coded orthogonal frequency division multiplexing (OFDM) systems in rapid fading channels is proposed. The channels at the training bauds are estimated using the EM (expectation-maximization) algorithm, while the channels at the data bauds are estimated based...

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Bibliographic Details
Published in:Journal of Zhejiang University. Science 2004, Vol.5 (1), p.45-49
Main Author: 单淑伟 罗汉文 宋文涛
Format: Article
Language:English
Subjects:
Algorithms
Computer Simulation
CSI
Information Storage and Retrieval - methods
Likelihood Functions
Models, Statistical
OFDM
Signal Processing, Computer-Assisted
Telecommunications
信道评估
正交频分多路复用
衰落信道
通道状态信息
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Summary:A simple channel estimator for space-time coded orthogonal frequency division multiplexing (OFDM) systems in rapid fading channels is proposed. The channels at the training bauds are estimated using the EM (expectation-maximization) algorithm, while the channels at the data bauds are estimated based on the method for modelling the time-varying channel as the linear combination of several time-invariant " Doppler channels". Computer simulations showed that this estimator outperforms the decision-directed tracking in rapid fading channels and that the performance of this method can be improved by iteration.
ISSN:1009-3095
DOI:10.1631/jzus.2004.0045