Adaptive antenna array receivers for spread-spectrum signals in non-Gaussian noise

We consider the problem of recovering a spread-spectrum (SS) signal in the presence of unknown highly correlated spread-spectrum interference and impu lsive noise. In terms of basic system and signal model considerations, we a ssume availability of a narrowband adaptive antenna array that experiences additive white Gaussian noise in time and across elements, as well as impul sive disturbance with direction-of-arrival (DOA) that changes at the chip r ate. The space-time receiver design developed in this work is characterized by the following attributes: (i) Adaptive interference suppression is purs ued in the joint space-time domain. (ii) An adaptive parametric nonlinear f ront end offers effective suppression of impulsive disturbances at low comp utational cost. (iii) An adaptive auxiliary-vector linear filter postproces sor offers effective, low-complexity suppression of SS interferers and lead s to superior bit-error-rate (BER) performance under rapid, short-data-reco rd system adaptation. Numerical and simulation comparisons with plain and o utlier resistant space-time minimum-variance-distortionless-response (MVDR) filtering procedures are included to illustrate and support the theoretica l developments. (C) 2001 academic Press.