Improving performance of prml/eprml through noise prediction

Abstract

Sequence estimationdetectors for the digital magnetic recording channel based on noise-predictive partial-response equalization are described. Called Noise-Predictive Maximum-Likelihood (NPML) detectors, they imbed a noise prediction/ whitening process into the branch metric computation of a Viterbi detector. Simulation results show that a judicious tradeoff between system parameters leads to substantial performance gains over both PRML and EPRML systems. A programmable 8-state NPML detector without decision feedback is presented. © 1996 IEEE.