A simple channel estimator for space-time coded OFDM systems in rapid fading channels |
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| Authors: | Shan Shu-wei Luo Han-wen Song Wen-tao |
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| Institution: | (1) Department of Electronic Engineering, Shanghai Jiaotong University, 200030 Shanghai, 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. |
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| Keywords: | Space-time coding OFDM Channel estimation EM algorithm Doppler channel |
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