Flexible Independent Component Analysis

Authors:
Seungjin Choi;Andrzej Cichocki;Shun-Ichi Amari
Affiliations:
Department of Electrical Engineering, Chungbuk National University, South Korea;Brain-Style Information Systems Research Group, Brain Science Institute, Riken, Japan&semi/ Warsaw University of Technology, Poland;Brain-Style Information Systems Research Group, Brain Science Institute, Riken, Japan
Venue:
Journal of VLSI Signal Processing Systems
Year:
2000

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Abstract

This paper addresses an independent component analysis (ICA) learning algorithm with flexible nonlinearity, so named as flexible ICA, that is able to separate instantaneous mixtures of sub- and super-Gaussian source signals. In the framework of natural Riemannian gradient, we employ the parameterized generalized Gaussian density model for hypothesized source distributions. The nonlinear function in the flexible ICA algorithm is controlled by the Gaussian exponent according to the estimated kurtosis of demixing filter output. Computer simulation results and performance comparison with existing methods are presented.