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Sensors 2017, 17(7), 1584; https://doi.org/10.3390/s17071584

Single Carrier with Frequency Domain Equalization for Synthetic Aperture Underwater Acoustic Communications

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
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Received: 10 May 2017 / Revised: 20 June 2017 / Accepted: 1 July 2017 / Published: 6 July 2017
(This article belongs to the Section Sensor Networks)
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Abstract

Phase-coherent underwater acoustic (UWA) communication systems typically employ multiple hydrophones in the receiver to achieve spatial diversity gain. However, small underwater platforms can only carry a single transducer which can not provide spatial diversity gain. In this paper, we propose single-carrier with frequency domain equalization (SC-FDE) for phase-coherent synthetic aperture acoustic communications in which a virtual array is generated by the relative motion between the transmitter and the receiver. This paper presents synthetic aperture acoustic communication results using SC-FDE through data collected during a lake experiment in January 2016. The performance of two receiver algorithms is analyzed and compared, including the frequency domain equalizer (FDE) and the hybrid time frequency domain equalizer (HTFDE). The distances between the transmitter and the receiver in the experiment were about 5 km. The bit error rate (BER) and output signal-to-noise ratio (SNR) performances with different receiver elements and transmission numbers were presented. After combining multiple transmissions, error-free reception using a convolution code with a data rate of 8 kbps was demonstrated. View Full-Text
Keywords: underwater acoustic communications; SC-FDE; channel equalization; synthetic aperture underwater acoustic communications; SC-FDE; channel equalization; synthetic aperture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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He, C.; Xi, R.; Wang, H.; Jing, L.; Shi, W.; Zhang, Q. Single Carrier with Frequency Domain Equalization for Synthetic Aperture Underwater Acoustic Communications. Sensors 2017, 17, 1584.

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