The underwater acoustic channel is very complex where Doppler frequency offsets, narrow bandwidth, serious multi-path time delay interference and frequency selective deep fading obstruct the development of high speed and fidelity underwater data transmissions. Orthogonal Frequency Division Multiplexing (OFDM) is a kind of novel paralleling transmission technology. In this paper, we mainly discuss three different pilot structures in channel estimation in OFDM underwater acoustic communication system and analyze the performance of channel estimation based on different pilot structure by simulation.
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