An information theoretic approach to a novel nonlinear independent component analysis paradigm
Signal Processing - Special issue: Information theoretic signal processing
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Abstract: A new method is proposed for the blind separation of mixed digital or analog sources, based on geometrical considerations concerning the observation space. For p mixed sources, where p is greater than or equal to two, the new approach considers the p-dimensional hyperparallelepiped formed in the observation space, and by means of a neural network with w/sub if/ weights, computes the coordinates of p vectors corresponding to the image of orthogonal inputs in the source space. These coordinates provide the columns of the unknown mixture matrix A, with a/sub if/ elements, and the neural network recursively separates the unknown sources, S/sub 0/. This geometrical procedure does not need the computation of any order of statistics, using instead primitives that may easily be implemented by hardware and it has a polynomial complexity (p/sup 3/) which depends on the number of sources (p).