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Conventional blind beamformers in DS-CDMA systems generally suffer from either unreliable convergence rate or signal cancellation in practical signal environment. In this paper, we propose a novel orthogonal projection scheme to extract spatial interference structure for the blind beamformer, which requires neither the direction of the desired signal nor the array geometry information. Exploiting...
The behavior of over-determined blind source separation(ODBSS) algorithm with unknown number of sources, proposed by Cichocki et al. is analyzed. It is found it is the redundant movement of demixing matrix among an equivalent class that causes the divergence of the algorithm. We cancel the redundant component among natural gradient, which corresponding to the redundant movement of the demixing matrix,...
This paper deals with subspace-based identification of unstable systems. Because the system is unstable, we will assume the experimental data are generated under stabilizing feedback. In order to remove the effect of noise an orthogonal projection is used. The system state space matrices are recovered from the extended observability matrix. The subspace-based identification algorithm is tested on...
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