Implement of channel estimation for OFDM communicaton system under UWA channel

Underwater acoustic (UWA) channel is a time-space-frequency varying channel. Coherent detection requires channel estimation in Orthogonal Frequency Division Multiplexing (OFDM) system. In this paper, the channel estimation methods based on pilot for OFDM UWA system are investigated. Through analysis and testing about two channel estimation performance, the adaptability based on Pilot Symbol Assisted Modulation (PSAM) channel estimation methods under UWA channel is given.

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