Ultrawideband underwater acoustic communication channels

Author
Walree, Paul van
Otnes, Roald Wilhelm
Date Issued
2013
Permalink
http://publications.ffi.no/handle/123456789/32
DOI
10.1109/JOE.2013.2253391
Collection
Articles
Description
Walree, Paul van; Otnes, Roald Wilhelm. Ultrawideband Underwater Acoustic Communication Channels. IEEE Journal of Oceanic Engineering 2013 ;Volum 38.(4) s. 678-688
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Abstract
Traditional channel models for communications research are designed for narrowband systems. Underwater acoustic communication systems use a bandwidth that is not small compared with the center frequency of the signal and qualify as ultrawideband (UWB) in a relative sense. In this paper, measurements and analysis of acoustic propagation effects demonstrate the shortcomings of narrowband channel models. These effects are frequency-dependent fluctuation rates and frequency-dependent attenuation, where the frequency dependence of the attenuation differs between paths. This frequency selectivity of the medium violates the assumption of uncorrelated taps and requires a UWB channel model. It is also shown that correlative channel sounders preserve wideband properties, which renders them suitable for UWB channel simulation based on the principle of direct replay.
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