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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2004, Vol. 5 Issue (1): 45-49    DOI: 10.1631/jzus.2004.0045
Computer & Information Science     
A simple channel estimator for space-time coded OFDM systems in rapid fading channels
SHAN Shu-wei, LUO Han-wen, SONG Wen-tao
Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, China
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Abstract  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.

Key words： Space-time coding      OFDM      Channel estimation      EM algorithm      Doppler channel     
Received: 11 March 2003     
CLC:  TN929.5  
  TN914  
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LUO Han-wen
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SHAN Shu-wei, LUO Han-wen, SONG Wen-tao. A simple channel estimator for space-time coded OFDM systems in rapid fading channels. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2004, 5(1): 45-49.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2004.0045     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2004/V5/I1/45

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