Compensation for time variance in long-range time-reversal communication

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In underwater acoustic communication, differently from radio communication in air, inter symbol interferences (ISI) due to multipath rich environment and the movement of source or receiver, which results in Doppler shift and time-variant channel impulse response, are very dominant. For the former, time reversal (phase conjugate) communication has been proposed and verified to be very efficient in the previous study. In this research, the method to compensate the effect of time variance in time-reversal communication is discussed and demonstrated based on the normal mode simulations and at-sea experiments.