Abstract
The most difficult problem in shallow underwater acoustic communications is considered to be the the time spread inherent to acoustic propagation in guide. The standard approach is to design an equalizer that attempts to correct for these propagation effects. In the presentation, a novel approach to multipath compensation in shallow water acoustic communication is proposed. The method is based on a dedispersion transformation technique, which was proposed in our previous paper [N. Wang, 9th Western Pacific Acoustic Conference, Beijing (2009)]. After dedispersion transform to a long range acoustic propagation signal, the field sampling data of a single hydrophone are transformed to several normal modes with the same waveforms. The dispersion of each modes, especially higher modes, can be removed after the transform. Then the computation cost of equalization can be decreased dramatically. The proposed approach requires less prior environmental information except an approximate beta‐value of waveguide invariant. The validity of the present approach is verified in simulation.
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