Acoustic Communication Using Time-Reversal Signal Processing: Spatial and Frequency Diversity

Abstract

Abstract. Time-reversal signal processing can be viewed as a form of matched filtering that operates both in time and in space. Acoustic communication represents a promising potential application of the processing. In designing a communications system, constraints are imposed by the available bandwidth and by the geometry of the time-reversal array. In the present paper, the interplay between bandwidth and array geometry is examined. If the bandwidth is large relative to the symbol rate, time -reversal processing can be successful with sparse arrays. If the array is well populated, the required bandwidth can be reduced. Results from experiments and data-driven simulations are presented.

Underwater Acoustic Communication in a Highly Refractive Environment Using SC–FDE

“…Loosely speaking, doubling the number of channels typically reduces the MSE by about a factor of two, or 3 dB. A similar scaling of MSE with the number of channels has been observed previously in both simulations and experiments when the channels are sufficiently separated from each other [18], [19]. At range 250 m, the propagation is dominated by refracted paths and the improvement is more than 3 dB.…”