Abstract

A recent time reversal experiment demonstrated that multiple foci can be projected from an array of sources to the same range but at different depths. This ‘‘multiple input, multiple output (MIMO)’’ process potentially can improve the information data rate. This paper presents the experimental results of binary phase shift keying (BPSK) communications at 3.5 kHz with a 500-Hz bandwidth where two different messages were sent simultaneously to different depths at 9-km range in 110-m-deep shallow water.

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