This paper proposes a novel estimation method of channel frequency response for orthogonal frequency division multiplexing (OFDM) systems operating in fast time-variant fading channels. The proposed method enables accurate coherent demodulation without using pilot signals, which are usually required to be inserted in the data symbols periodically to cope with fast time-variant fading. Computer simulation results show that the proposed method maintains better BER performance even when the vehicle speed reaches 180 km/h.
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Fukuhara et al. (2004) studied this question.