A New Choice of Influence Function for Robust Multiuser Detection in Non-Gaussian Channels

This paper presents a robust multiuser detector for combating multiple access interference and impulsive noise in code-division multiple-access (CDMA) communication systems. A new M-estimator is proposed for robustifying the detector. Robustness measures gross error sensitivity, asymptotic performance, and relative efficiency of the proposed estimator are analyzed. The approach is corroborated with simulation results to evaluate the performance of the proposed robust multiuser detector in comparison with the linear decorrelating detector, Huber and Hampel estimator based detectors. Simulation results show that the proposed detector with significant performance gain outperforms the linear decorrelating detector, the Huber and the Hampel estimator based detectors