Matrix-group algorithm via improved whitening process for extracting statistically independent sources from array signals

Da Zheng Feng, Wei Xing Zheng, Andrzej Cichocki

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

This paper addresses the problem of blind separation of multiple independent sources from observed array output signals. The main contributions in this paper include an improved whitening scheme for estimation of signal subspace, a novel biquadratic contrast function for extraction of independent sources, and an efficient alterative method for joint implementation of a set of approximate diagonalization-structural matrices. Specifically, an improved whitening scheme is first developed by estimating the signal subspace jointly from a set of diagonalization-structural matrices based on the proposed cyclic maximizer of an interesting cost function. Moreover, the globally asymptotical convergence of the proposed cyclic maximizer is analyzed and proved. Next, a novel biquadratic contrast function is proposed for extracting one single independent component from a slice matrix group of any order cumulant of the array signals in the presence of temporally white noise. A fast fixed-point algorithm that is a cyclic minimizer is constructed for searching a minimum point of the proposed contrast function. The globally asymptotical convergence of the proposed fixed-point algorithm is analyzed. Then, multiple independent components are obtained by using repeatedly the proposed fixed-point algorithm for extracting one single independent component, and the orthogonality among them is achieved by the well-known QR factorization. The performance of the proposed algorithms is illustrated by simulation results and is compared with three related blind source separation algorithms.

Original languageEnglish
Pages (from-to)962-977
Number of pages16
JournalIEEE Transactions on Signal Processing
Volume55
Issue number3
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

Keywords

  • Biquadratic contrast function
  • Blind source separation
  • Cyclic maximizer
  • Cyclic minimizer
  • Diagonalization
  • Eigenvalue decomposition (EVD)
  • Independent components
  • JADE
  • Signal subspace extraction
  • Whitening technique

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