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This paper presents an underwater acoustic communication channel model to reveal the influence of rough bottom reflection and scattering on the channel. We analyze experimental data from two channel measurement campaigns, and concentrate on the channel properties such as the spread-Doppler function, the time coherence function and the spatial coherence function to study the variations induced by medium...
In this paper, the methods for estimating and tracking sparse doubly spread channels in single-carrier coherent communications are investigated. The sparse doubly spread channel is parameterized by a few paths with different delays, Doppler scales, and gains. Based on the model, a low-complexity channel estimation algorithm is proposed. The channel estimation is divided into two stages, the first...
This work considers the problem of false frame synchronization for underwater acoustic communication (UWAC), and a new frame synchronization approach based on Linear Frequency Modulation (LFM) signal parameters estimation is proposed. Two parameters estimation techniques including Fractional Fourier Transform (FRFT) estimation and Maximum Likelihood (ML) estimation have been presented in this paper...
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