Abstract
We have studied the focusing property of time-reversal waves and its application to acoustic communication in shallow water. In this study, this focusing property in the deep ocean and its application to long horizontal acoustic communication are discussed. The results are as follows. Even if a time-reversal array (TRA) does not expand from the sea surface to the seabed, time-reversal signals converge, and the focusing property is not significantly affected by the depths of the focus and TRA. Then, it is revealed that by using time reversal, it is possible to enssure communication channel over a long range, through the simulation. In phase modulation, time reversal can demodulate almost only by itself, while in amplitude and phase modulation, an adaptive filter to compensates further.
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