Time reversal acoustic communication of mobile platform using doppler correction without resampling

Abstract

With the rapidly increasing of different types of mobile platform in various marine missions, tremendous Doppler effects of mobile acoustic communication pose extreme difficulty for design of mobile acoustic communication receiver. To overcome this problem, the approach of resampling has been extensively used to address the scaling effect caused by Doppler. However, computational complexity as well as the high precision sampling rate conversion needed by accurately resampling, especially for multichannel systems, leads to additional overhead of the receiver. To facilitate no resampling Doppler correction, this paper adopts a time reversal mobile acoustic communication receiver employing a two-stage Doppler correction approach, which firstly performs bulk Doppler shift estimation as well as the initial channel estimation, and then addresses the Doppler distortion by periodic channel estimation based time reversal processor, that followed by a single channel adaptive decision feedback equalizer (DFE) to tackle the residual Doppler. Sea trial experiments carried out on moving platform associated with a Doppler of -16Hz are carried out to demonstrate the effectiveness of the proposed low complexity acoustic communication approach for mobile platform.