A new parametric GLRT for multichannel adaptive signal detection

A parametric generalized likelihood ratio test (GLRT) for multichannel signal detection in spatially and temporally colored disturbance was recently introduced by modeling the disturbance as a multichannel autoregressive (AR) process. The detector, however, involves a highly nonlinear maximum likelihood estimation procedure, which was solved via a two-dimensional iterative search method initialized by a suboptimal estimator. In this paper, we present a simplified GLRT along with a new estimator for the problem. Both the estimator and the GLRT are derived in closed form at considerably lower complexity. With adequate training data, the new GLRT achieves a similar detection performance as the original one. However, for the more interesting case of limited training, the original GLRT may become inferior due to poor initialization. Because of its simpler form, the new GLRT also offers additional insight into the parametric multichannel signal detection problem. The performance of the propo...

• Type: Journal
• Year: 2010
• Where: TSP
• Authors: Pu Wang, Hongbin Li, Braham Himed
• Keywords: Artificial Intelligence, Estimator, Multichannel Signal Detection, Parametric Generalized Likelihood, TSP 2010