A Robust Multiuser Detection Based Scheme for Crosstalk Mitigation in DMT VDSL with Non-Gaussian Noise

Very-high-rate digital subscriber line (VDSL) transmission systems mainly suffer from crosstalk and impulse noise. The traditional single-user data detector for such systems merges crosstalk into the background noise, which is assumed to be white and Gaussian. Recent advances in research show the potential benefits of multiuser detection for VDSL systems with crosstalkers and the nature of crosstalk signals. Impulse noise is one of the most difficult transmission impairments to suppress. Thus, this paper presents a robust multiuser detection technique for jointly mitigating crosstalk and impulse noise in discrete multitone very-high-rate digital subscriber line (DMT VDSL) systems. The robustification is based on the concept of M-estimators found in the robust statistics. A new M-estimator is proposed for robustifying the detector. The approach is corroborated with simulation results. Simulation results demonstrate that the proposed detector with significant performance gain outperforms the alpha, Huber, and Hampel M-estimators based detectors with little attendant increase in computational complexity.