Martins, N.Jesus, S. M.Gervaise, C.Quinquis, A.2014-10-092014-10-092002N. MARTINS, "A Time-Frequency Approach to Blind Deconvolution in Multipath Underwater Channels" in IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2002, pp. 1225-1228.AUT: SJE00662;http://hdl.handle.net/10400.1/5247Blind 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 has proved to overcome the typical ill-conditioning of single sensor deterministic deconvolution techniques.engconference objecthttp://dx.doi.org/10.1109/ICASSP.2002.5744022