0424112 20240103203801.120140129235959.9 84887029914 000326120300001 10.1109/LSP.2013.2285932 A Two-Stage MMSE Beamformer for Underdetermined Signal Separation 4 s. P cav_un_epca*02532121070-9908IEEE Signal Processing Letters2012 (2013)1227-1230Institute of Electrical and Electronics Engineers beamforming underdetermined mixtures blind source separation cav_un_auth*0108100 Stochastická informatika Department of Stochastic Informatics SI SI Department of Stochastic Informatics Koldovský Zbyněk UTIA-B Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0101212 Stochastická informatika Department of Stochastic Informatics SI SI Department of Stochastic Informatics Tichavský Petr UTIA-B Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0274170 Phan A. H. JP cav_un_auth*0274171 Cichocki A. JP http://library.utia.cas.cz/separaty/2014/SI/koldovsky-0424112.pdf cav_un_auth*0301478 GAP103/11/1947 GA ČR CZ Blind separation of underdetermined instantaneous mixtures is a popular solution to inverse problems encountered in audio or biomedical applications where the number of sources exceeds the number of sensors. There are two non-equivalent tasks: to identify the mixing matrix and to separate the original sources. In this paper, we focus on the latter task by proposing a novel beamformer that minimizes the theoretical mean square error distance between the separated and original signals. The beamformer has two stages: one for the estimation of signals and one for their refinement. Within the former stage, the signals are assumed to be random and locally stationary, while the latter stage is based on a semi-deterministic model. The experiments prove superior performance of the proposed method compared to conventional MMSE beamforming. BB 2014 4 RVO:67985556 http://hdl.handle.net/11104/0230619 ENGINEERINGELECTRICALELECTRONIC 1.718 0.264 6.IV 0.01450 0.797 4223 295 0.785 ScienceCitationIndexExpanded Q1 66.128 64.718 Q2 Q2 2013 84887029914 SCOPUS 000326120300001 WOS cav_un_epca*0253212 IEEE Signal Processing Letters 1070-9908 1558-2361 Roč. 20 č. 12 2013 1227 1230 Institute of Electrical and Electronics Engineers