Abstract
Aiming at the influence of underwater acoustic channel (UAC) profile difference on the performance of underwater acoustic communication, a variable observation window length blind equalization detector (VOWL-BED) is proposed in this paper. Compared with the existing methods, the observation window length (OWL) of the proposed VOWL-BED can be dynamically regulated on the basis of a given UAC profile and finally converge to the optimum OWL. We have verified the feasibility of the OWL regulation. The simulation results also demonstrate that the VOWL-BED can achieve better performance than the conventional invariable OWL blind equalization detector (IOWL-BED).
Highlights
Underwater acoustic channel (UAC) is one of the most complex wireless channels
The equalization performance based on minimum mean square error (MMSE) standard has been comprehensively analyzed, the results show that the MMSE obtained by the equalizer is a monotonically non-increasing function of the observation window length (OWL) [32, 33], and the OWL would severely influence the performance of equalizer
We propose an underwater acoustic communication system based on blind equalization detector
Summary
Underwater acoustic channel (UAC) is one of the most complex wireless channels. In such channels, intersymbol interference (ISI) is caused by the overlap of symbols, due to the multipath signal propagation [1–3]. To use the restricted bandwidth of UAC more efficiently, some blind equalization approaches are applied to underwater acoustic communication [8–31]. Several variable OWL schemes for non-blind equalization algorithm are proposed for terrestrial wireless communication environment [34–39]; in these schemes, the channel is assumed to be stationary, and the observation period is infinitely long. As far as we know, the investigations on variable OWL blind equalization detector (VOWL-BED) for underwater acoustic communication are still lacking. A VOWL-BED for underwater acoustic communication is proposed. We propose an underwater acoustic communication system based on blind equalization detector. To achieve better performance, a variable observation window length blind equalization detector base on accumulated squared error (ASE) is proposed. We verify that the proposed VOWL-BED can achieve better performance than traditional invariable OWL blind equalization detector (IOWL-BED).
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