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Crosstalk mitigation using adaptive time reversal
2.J. Gomes, A. Silva, and S. Jesus, “Adaptive spatial combining for passive time-reversed communications,” J. Acoust. Soc. Am. 124, 1038–1053 (2008).
4.H. C. Song, W. S. Hodgkiss, W. A. Kuperman, T. Akal, and M. Stevenson, “Multiuser communications using passive time reversal,” IEEE J. Ocean. Eng. 32, 915–926 (2007).
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Although the spatial focusing property of the conventional time reversal approach facilitates multiuser communications, there always is residual crosstalk between users. A recent paper [Kim and Shin, J. Acoust. Soc. Am.115, 600–606 (2004)] proposed an adaptive active time reversal approach for simultaneous multiple focusing with minimal interference. This letter applies the adaptive approach to passive time reversal, multiuser communications for additional suppression of crosstalk among users. Experimental data at with a bandwidth demonstrate as much as improvement per user in terms of output signal-to-noise ratio for three-user communications over a range in deep shallow water.
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