Application of Filtering Based Turbo Equalization Algorithms to Magnetic Recording Channels

摘要

We investigate potential turbo equalization (TE) schemes for high density advanced magnetic recording systems. Compared to conventional TE schemes based on partial response maximum likelihood (PRML) detection, filtering based TE schemes are attractive due to their low computational complexity. In this paper, we focus on soft feedback equalization (SFE). We modify the generic SFE to deal with jitter noise. Furthermore, novel bidirectional SFE (2D-SFE) and modified SFE (MSFE) schemes are proposed to improve the performance of the generic SFE. Simulation results suggest that, for longitudinal channels, SFE and its variants perform competitively with conventional PRML based schemes with a much lower complexity. For perpendicular channels, however, the performance deteriorates.