A new multiuser detector for DS-CDMA system in time selective fading channels with impulsive noise

A Network of Kalman Filters (NKF)-based detector has recently been proposed for multiple access interference (MAI) and intersymbol interference (ISI) compensation in DS-CDMA systems. This paper presents a modified detector which deals with an "/spl epsiv/-contaminated" impulsive noise model. The model of the probability density function (pdf) of the noise as a sum of two weighted Gaussians is exploited in order to robustify the NKF detector. It is shown that the derived new version of the NKF can be viewed as a result of two NKF working on two different variances of background noise and coupled via the contamination parameter (/spl epsiv/). The resulting NKF detector is found to outperform the NKF detector optimised under the assumption that the measurement noise is Gaussian. A MAP symbol-by-symbol detector in impulsive noise is also derived for comparison.