Sparse-representation algorithms for blind estimation of acoustic-multipath channels

Abstract

Acoustic channel estimation is an important problem in various applications. Unlike many existing channel estimation techniques that need known probe or training signals, this paper develops a blind multipath channel identification algorithm. The proposed approach is based on the single-input multiple-output model and exploits the sparse multichannel structure. Three sparse representation algorithms, namely, matching pursuit, orthogonal matching pursuit, and basis pursuit, are applied to the blind sparse identification problem. Compared with the classical least squares approach to blind multichannel estimation, the proposed scheme does not require that the channel order be exactly determined and it is robust to channel order selection. Moreover, the ill-conditioning induced by the large delay spread is overcome by the sparse constraint. Simulation results for deconvolution of both underwater and room acoustic channels confirm the effectiveness of the proposed approach.

Decomposition of multipath Lamb waves with sparse wavenumber analysis for structural health monitoring

“…Furthermore, these dispersion compensation methods are sensitive to multipath interference. While there are methods to separate multipath components [7], they generally cannot account for unknown multimodal and dispersive behavior. As a result, these methods are not practical for analyzing realistic guided wave data.…”