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Time-Frequency approach to multipath underwater channel deconvolution

N.Martins and S.M. Jesus and
SiPLAB-FCT, Universidade do Algarve
Faro, Portugal
C.Gervaise and A.Quinquis and
Brest, France.

Comments: download pdf file .
Ref.: Proc. ICASSP 2002, (ISBN 0-7803-7403-7), p.II-1225-1228, Orlando (USA), May 2002.

Abstract: Blind deconvolution is presented in the underwater acoustic channel context, by time-frequency processing. The acoustic propagation environment was modelled as a multipath propagation channel. For noiseless simulated data, source signature estimation was performed by a model-based method. The channel estimate was obtained via a time-frequency formulation of the conventional matched-filter. Simulations used a ray-tracing physical model, initiated with at-sea recorded environmental data, in order to produce realistic underwater channel conditions. The quality of the estimates was 0.793 for the source signal, and close to 1 for the resolved amplitudes and time delays of the impulse response. Time-frequency processing was proved to overcome the typical ill-conditioning of single sensor deterministic deconvolution techniques.