Iterative soft decoded partial response channels for hybrid magneto-optical recording

Author

Song, Hongwei ; Liu, Jingfeng ; Kumar, B. V K Vijaya ; Kurtas, Erozan

Author_Institution

Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

37

Issue

2

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

676

Lastpage

681

Abstract

In this paper, a physical model of readback signals from a hybrid magneto-optical (MO) recording using magnetic flux detection is presented. The minimum mean-square error (MMSE) technique has been used to design generalized partial response (GPR) targets in order to facilitate the application of the trellis based channel detector. A PR target with integer coefficients is proposed as a good approximation to the GPR target. We also address the application of turbo codes and LDPC codes with iterative soft decoding structure to the hybrid magneto-optical (MO) recording channel. The effects of bloom, transition noise and giant magneto-resistive (GMR) sensor nonlinearity on the bit error rate (BER) performance are investigated both for uncoded partial response maximum likelihood (PRML) and iterative soft decoded recording channels. Our results for the hybrid recording channels indicate that turbo/LDPC codes of rate 16/17 can achieve coding gains of about 5 dB over PRML methods for a 10^-5 target BER at the normalized density S=1.5. Turbo codes with iterative soft decoding are seen to be robust to transition noise

Keywords

iterative decoding; magnetic flux; magneto-optical recording; mean square error methods; partial response channels; turbo codes; 5 dB; GMR sensor; LDPC codes; bit error rate; coding gains; generalized partial response targets; hybrid magneto-optical recording; integer coefficients; iterative soft decoded partial response channels; magnetic flux detection; minimum mean-square error technique; normalized density; readback signals; soft decoding structure; transition noise; trellis based channel detector; turbo codes; Bit error rate; Ground penetrating radar; Iterative decoding; Magnetic flux; Magnetooptic effects; Magnetooptic recording; Maximum likelihood decoding; Parity check codes; Partial response channels; Turbo codes;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.917600

Filename

917600