A slide match and iteration approach for mobile underwater acoustic communication

摘要

This paper focusses on the requirements for mobile underwater acoustic communication. In this paper, we adopt a chirp signal, which has a Doppler insensitive property, as the communication carrier, and a slide match and propose an iteration based approach to estimate the sequenced Doppler coefficient. We first estimate the initial Doppler coefficient of the synchronization signal using Fractional Fourier transformation. Then, based on this initial coefficient, a slide match and iteration approach is applied to adjacent chirp codes which produces information to estimate the new Doppler coefficient and demodulation information at the same time. Compared with other methods, the proposed algorithm could obtain a higher precision of the Doppler coefficient with low computational burden. Simulation results show that the proposed method outperforms the traditional constant Doppler compensation approach and it could be easily realized in practical application.