A Study on Nonbinary LDPC Coding and Iterative Decoding System in BPM R/W Channel

Author

Nakamura, Yoshihiko ; Bandai, Y. ; Okamoto, Yuji ; Osawa, Hideya ; Aoi, H. ; Muraoka, Hiroaki

Author_Institution

Grad. Sch. of Sci. & Eng., Ehime Univ., Matsuyama, Japan

Volume

47

Issue

10

fYear

2011

Firstpage

3566

Lastpage

3569

Abstract

In this paper, the iterative decoding system using the nonbinary low-density parity-check (LDPC) code is studied in the magnetic recording system using a bit-patterned media (BPM) R/W channel affected by the write head field gradient, the media switching field distribution (SFD), the demagnetization field from adjacent dots, and the dot position deviation in an areal recording density of 2 Tb/in². The performance of iterative decoding system using the nonbinary LDPC code over Galois field of GF(2⁸) is evaluated by the computer simulation, and it is compared with the conventional iterative decoding system using the binary LDPC code. The results show that the nonbinary LDPC system provides better performance compared with the binary LDPC system.

Keywords

Galois fields; demagnetisation; iterative decoding; magnetic heads; magnetic recording; magnetic switching; parity check codes; Galois field; areal recording density; bit-patterned media R-W channel; computer simulation; demagnetization field; iterative decoding system; magnetic recording system; media switching field distribution; nonbinary low-density parity-check code; nonbiniary LDPC coding; write head field gradient; Decoding; Encoding; Iterative decoding; Magnetic heads; Media; Writing; Bit-patterned media (BPM); iterative decoding; nonbinary low-density parity-check (LDPC) code;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2147766

Filename

6028104