Post compensation for nonlinear distortions in PRML recording channel

Author

Lin, Yinyi ; Yuan, Ming Fung

Author_Institution

Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3033

Lastpage

3035

Abstract

The performance of the PRML recording channel is degraded due to nonlinear distortions introduced in the recording or reproducing processes for high density recordings. Although the maximum likelihood sequence detector (Viterbi detector) might be applied to the channel including nonlinearities, the Viterbi detector suffers hardware complexity since the interleaved two-state trellis diagram for 1-D partial response channel does not sufficiently describe the PRML channel including nonlinearities. In this study, a post compensation for the PRML recording channel including nonlinearities is presented. The nonlinear effects are compensated for after playback and the interleaved two-state trellis for 1-D partial response channel is used to recover data from compensated signal. Simulation results indicate that the performance can be enhanced with a slight increase in hardware complexity

Keywords

compensation; magnetic recording; maximum likelihood detection; partial response channels; trellis codes; 1D partial response channel; PRML recording channel; compensated signal; hardware complexity; high density recordings; interleaved two-state trellis; nonlinear distortions; post compensation; Degradation; Demagnetization; Detectors; Equalizers; Hardware; Intersymbol interference; Maximum likelihood detection; Nonlinear distortion; Partial response channels; Viterbi algorithm;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490260

Filename

490260