Adaptive Blind Separation of Two Dependent Sources

Abstract

We consider the problem of adaptive blind separation of two sources from their instantaneous mixtures. We focus on the case where the two sources are not necessarily independent. By analyzing a general form of adaptive algorithms we show that separation is possible not only for independent sources but also for sources that are dependent provided their joint pdf satisfies certain symmetry conditions. A very interesting problem consists in identifying the class of dependent sources that are non-separable, namely, the counterpart of Gaussian sources of the independent case. We corroborate our theoretical analysis with a number of simulations and give examples of dependent sources that can be easily separated.