We investigate the information regularity and identifiability of the blind source separation problem with constant modulus constraints on the sources. We demonstrate that the information regularity (existence of a finite Cramér-Rao bound) is closely related to local identifiability. Sufficient and necessary conditions for local identifiability are derived. We also study the conditions under which unique (global) identifiability is guaranteed within the inherently unresolvable ambiguities on phase rotation and source permutation. Both sufficient and necessary conditions are obtained.
|Original language||English (US)|
|Journal||ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings|
|State||Published - Sep 27 2004|
|Event||Proceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada|
Duration: May 17 2004 → May 21 2004