Joint Approximation Diagonalization of Eigen-matrices
Joint Approximation Diagonalization of Eigen-matrices (JADE) is an algorithm for independent component analysis that separates observed mixed signals into latent source signals by exploiting fourth order moments. The fourth order moments are a measure of non-Gaussianity, which is used as a proxy for defining independence between the source signals. The motivation for this measure is that Gaussian distributions possess zero excess kurtosis, and with non-Gaussianity being a canonical assumption of ICA, JADE seeks an orthogonal rotation of the observed mixed vectors to estimate source vectors which possess high values of excess kurtosis.
Let denote an observed data matrix whose columns correspond to observations of -variate mixed vectors. It is assumed that is prewhitened, that is, its rows have a sample mean equaling zero and a sample covariance is the dimensional identity matrix, that is,
Applying JADE to entails
- computing fourth-order cumulants of and then
- optimizing a contrast function to obtain a rotation matrix
to estimate the source components given by the rows of the dimensional matrix .
- Cardoso, Jean-François; Souloumiac, Antoine (1993). "Blind beamforming for non-Gaussian signals". IEE Proceedings F (Radar and Signal Processing). 140 (6): 362–370.
- Cardoso, Jean-François (Jan 1999). "High-order contrasts for independent component analysis". Neural Computation. 11 (1): 157–192. doi:10.1162/089976699300016863.
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