Vertical underwater acoustic (UWA) communications play a crucial role in deep-sea applications. A vertical UWA channel generally features a moderate multipath but with time-varying Doppler shifts as well as loud impulsive noise. To achieve a robust vertical single-carrier UWA communication, this paper proposes an enhanced iterative receiver. First, a spline interpolation-based timing estimation approach is proposed to compensate for the time-varying Doppler effects efficiently. Then, the residual timing errors and the multipath interference are tackled by a fractionally spaced self-iterative soft equalizer (SISE) based on the vector approximate message passing (VAMP) algorithm. The VAMP-SISE consists of four parts: an inner soft slicer and an inner soft equalizer for symbol detection as well as a denoiser and a minimum mean-squared error estimator for impulsive noise suppression. Different parts iteratively exchange extrinsic information to improve the equalization performance. Last, a channel-fitting irregular convolutional code and a unity-rate code are employed at the transmitter to lower the signal-to-noise ratio threshold for reliable communications. Deep-sea experiments verify the performance superiority of the proposed receiver over existing schemes.
An enhanced iterative receiver based on vector approximate message passing for deep-sea vertical underwater acoustic communications
Also at: School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China. Electronic mail: [email protected], ORCID: 0000-0002-9679-7522.
Also at: State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190, China, ORCID: 0000-0001-5158-5756.
Also at: Beijing Engineering Technology Research Center of Ocean Acoustic Equipment, Beijing 100190, China.
Also at: State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.
Dong Li, Yanbo Wu, Min Zhu, Jun Tao; An enhanced iterative receiver based on vector approximate message passing for deep-sea vertical underwater acoustic communications. J. Acoust. Soc. Am. 1 March 2021; 149 (3): 1549–1558. https://doi.org/10.1121/10.0003625
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