Suppression of bit-pulsed jammer signals in DS-CDMA array system using independent component analysis

In this paper, independent component analysis is considered for blind suppression of interference caused by bit-pulsed jamming in a direct sequence spread spectrum communication system. A framework for applying blind techniques to the jammer mitigation problem was earlier introduced in Belouchrani et al. (2000). However, the scheme proposed there is based on second-order statistics only, and has serious practical limitations. For example, it fails for temporally uncorrelated data which is commonplace in CDMA communications. This paper extends the framework by taking into account both data modulation and temporally uncorrelated jamming, and removes the uncorrelatedness limitation by employing independent component analysis instead of second-order statistics. Computer simulations show that the proposed method performs better than the well-known RAKE method, which is the standard choice for suppressing jammer signals.