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Channel estimation is an important procedure of coherent demodulation of OFDM system for underwater acoustic communications, by which the system performance is largely restricted. In this paper, the performance of three pilot patterns and their own application conditions are analyzed and compared. According to the simulation and experiment results, it is concluded that scatter pilot pattern is very suitable for OFDM system for underwater acoustic communications. In addition, vector hydrophone is also can be used to improve communication performance via joint processing of pressure and particle velocity.