Abstract
The ocean environment is known to present significant challenges to underwater acoustic communication, including noise-imposed bandwidth constraints and large-scale temporal dispersion due to macro-multipath propagation. In addition, acoustic interaction with the rough, moving ocean surface degrades the spatial and temporal coherence of acoustic communication signals, thereby diminishing the achievable data rates. In this work, the effects of the ocean surface on acoustic communication channel capacity are examined in a computational study for a shallow-water waveguide bounded by an ocean surface disturbed by gravity and capillary waves. Surface wave spectra are derived from empirical models [Donelan and Pierson, J. Geophys. Res. 92, 4971] and are used to construct realizations of the 2-D moving surface. Then, 2-D and 3-D propagation models are applied to derive the space-time correlation properties of the acoustic channel, from which stochastic channel models are constructed. The adequacy of N × 2-D propagation modeling for this construction is also assessed. The channel models are then used as a basis for the estimation of channel spectral efficiency (achievable data rate per unit of frequency increment). Extensions to estimates of channel capacity are then discussed. [Work supported by the Office of Naval Research.]
Published Version
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