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Erschienen in: Neural Computing and Applications 2/2010

01.03.2010 | Original Article

A reference-based blind source extraction algorithm

verfasst von: Changli Li, Guisheng Liao

Erschienen in: Neural Computing and Applications | Ausgabe 2/2010

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Abstract

By utilizing a priori information available as reference, constrained independent component analysis (cICA) or independent component analysis with reference (ICA-R) achieves some advantages over other methods. However, ICA-R is very time-consuming; moreover, it is very difficult to determine its threshold parameter, once the value is improperly chosen the algorithm will fail to converge. In order to overcome these drawbacks, a very simple blind source extraction method, whose optimization function is simply the closeness measure between the desired output and its corresponding reference in ICA-R, is proposed in this paper. Experiments with synthesized data and real-world electrocardiograph data confirm its validity and superiority.

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Fußnoten
1
P = (p1, p2, …,p m ) is called a canonical basis vector, if p i  = 1 and p l  = 0,∀l ≠ i [1].
 
2
Since s i ’ are mutually independent and we assume E{s i 2 } = 1, we have E{ss T} = I. \(\tilde{\bf{x}}\) is whitened, so we have \( E\{{\tilde{\bf{x}}\tilde{\bf{x}}}^{T} \} = \left({{\bf{VA}}} \right)E\{{\bf{ss}}^{T} \} \left({{\bf{VA}}} \right)^{T} = \left({{\bf{VA}}} \right)\left({{\bf{VA}}} \right)^{T} = {\bf{I}}. \) Hence, VA is orthogonal. Due to ||w|| = 1 and VA being a unitary matrix, we can get ||p|| = ||w T VA|| = ||w T || = 1. This is why any p in Table 1 is near to a canonical basis vector.
 
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Metadaten
Titel
A reference-based blind source extraction algorithm
verfasst von
Changli Li
Guisheng Liao
Publikationsdatum
01.03.2010
Verlag
Springer-Verlag
Erschienen in
Neural Computing and Applications / Ausgabe 2/2010
Print ISSN: 0941-0643
Elektronische ISSN: 1433-3058
DOI
https://doi.org/10.1007/s00521-009-0303-x

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