Title :
Ultrawideband Underwater Acoustic Communication Channels
Author :
van Walree, Paul A. ; Otnes, Roald
Author_Institution :
Norwegian Defence Res. Establ. FFI, Horten, Norway
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.
Keywords :
ultra wideband communication; underwater acoustic communication; UWB channel model; UWB channel simulation; acoustic propagation effects; frequency-dependent attenuation; frequency-dependent fluctuation rates; narrowband channel models; ultrawideband underwater acoustic communication channels; Communication channels; Propagation; Ultra wideband communication; Underwater acoustics; Underwater communication; Fading statistics; path loss; underwater communications; wideband propagation channels;
Journal_Title :
Oceanic Engineering, IEEE Journal of
DOI :
10.1109/JOE.2013.2253391