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Formalization of the Two-Step Approach to Overcomplete BSS

Theis, Fabian J. ; Lang, Elmar


We discuss overcomplete blind source separation (BSS), that is separation with more sources than sensors. Finding the mixing matrix solves the linear quadratic BSS problem; in overcomplete BSS however, it is then still not clear and not even unique how to get the sources from the mixtures and the mixing matrix. We therefore follow Bofill and Zibulevsky and many others and take a two-step approach ...


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