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Sensors 2012, 12(2), 2118-2135; doi:10.3390/s120202118

Experimental Assessment of Different Receiver Structures for Underwater Acoustic Communications over Multipath Channels

Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), Trondheim NO-7491, Norway
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Received: 20 December 2011 / Revised: 1 February 2012 / Accepted: 3 February 2012 / Published: 14 February 2012
(This article belongs to the Special Issue Underwater Sensor Nodes and Underwater Sensor Networks)
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Abstract

Underwater communication channels are often complicated, and in particular multipath propagation may cause intersymbol interference (ISI). This paper addresses how to remove ISI, and evaluates the performance of three different receiver structures and their implementations. Using real data collected in a high-frequency (10–14 kHz) field experiment, the receiver structures are evaluated by off-line data processing. The three structures are multichannel decision feedback equalizer (DFE), passive time reversal receiver (passive-phase conjugation (PPC) with a single channel DFE), and the joint PPC with multichannel DFE. In sparse channels, dominant arrivals represent the channel information, and the matching pursuit (MP) algorithm which exploits the channel sparseness has been investigated for PPC processing. In the assessment, it is found that: (1) it is advantageous to obtain spatial gain using the adaptive multichannel combining scheme; and (2) the MP algorithm improves the performance of communications using PPC processing. View Full-Text
Keywords: underwater acoustic communication; time reversal; passive-phase conjugation; matching pursuit; decision feedback equalizer underwater acoustic communication; time reversal; passive-phase conjugation; matching pursuit; decision feedback equalizer
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zhang, G.; Hovem, J.M.; Dong, H. Experimental Assessment of Different Receiver Structures for Underwater Acoustic Communications over Multipath Channels. Sensors 2012, 12, 2118-2135.

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