Robust interference suppression for DS-CDMA under Gaussian and non-Gaussian noise channels

In many physical channels, such as urban and indoor radio channels, the ambient noise is known through experimental measurements to be decidedly non-Gaussian, which makes the system performance degradation under non-Gaussian channels for those only utilizing the conventional Gaussian interference suppression scheme. In this paper, a robust multi-stage nonlinear interference suppression scheme is developed for synchronous DS-CDMA system under either Gaussian or non-Gaussian noise channels. For the DS-CDMA systems, simulation results show that the proposed scheme not only has nearly the same performance with the classical Gaussian interference suppression scheme under Gaussian noise channels, but also offers significant performance gain over the classical Gaussian interference suppression scheme under non-Gaussian noise channels.