2-STAGE NONLINEAR DETECTOR IN DS SSMA COMMUNICATIONS WITH IMPULSE NOISE/

A new two-stage nonlinear detector for synchronous DS/SSMA communicati ons in impulsive channels is presented and analysed. In the detector, an interference cancellation scheme is used such that the effect of th e multiple-access interference on the system performance can be allevi ated. For a multiuser system with long spreading sequences an approxim ate error probability is derived and shows that the new detector is in sensitive to the 'near-far' effect and gives a near-single-user perfor mance. For cases with short spreading sequences Monte-Carlo simulation is carried out to estimate the error probability and the results show that the detector performs robustly in various mixtures of noise.