Nulling crosstalk in underwater communication with an adaptive time-reversal mirror

Since the concept of adaptivity has been introduced into the time-reversal mirror (TRM) in order to steer nulls and is referred to as the adaptive time-reversal mirror (ATRM), the ATRM has been applied to focus selectively on a weak target and to have multiple focusing simultaneously. In this study, the ATRM is applied to nulling the crosstalk between receivers in underwater communication when independent symbol sequences are sent simultaneously to different receivers. The nulling process utilizes probe source transmissions from the receiving locations in order to find the ATRM weight vectors to be backpropagated. The algorithm is applied to long-range underwater acoustic communication to show, via simulation, that the crosstalk at multiple receiving locations can be cancelled.