Independent phase analysis: separating phase-locked subspaces

Authors:
Miguel Almeida;José Bioucas-Dias;Ricardo Vigário
Affiliations:
Institute of Telecommunications, Instituto Superior Técnico, Lisbon, Portugal;Institute of Telecommunications, Instituto Superior Técnico, Lisbon, Portugal;Adaptive Informatics Research Centre, Aalto University School of Science and Technology, Finland
Venue:
LVA/ICA'10 Proceedings of the 9th international conference on Latent variable analysis and signal separation
Year:
2010

Citing 3
Cited 0

Discrete-time signal processing (2nd ed.)

Discrete-time signal processing (2nd ed.)
Source Separation of Phase-Locked Subspaces

ICA '09 Proceedings of the 8th International Conference on Independent Component Analysis and Signal Separation
A blind source separation technique using second-order statistics

IEEE Transactions on Signal Processing

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Abstract

We present a two-stage algorithm to perform blind source separation of sources organized in subspaces, where sources in different subspaces have zero phase synchrony and sources in the same subspace have full phase synchrony. Typical separation techniques such as ICA are not adequate for such signals, because phase-locked signals are not independent. We demonstrate the usefulness of this algorithm on a simulated dataset. The results show that the algorithm works very well in low-noise situations. We also discuss the necessary improvements to be made before the algorithm is able to deal with real-world signals.