Performance Evaluation of Non-binary LDPC Coding and Iterative Decoding System for BPM R/W Channel with Write-Errors

Yasuaki NAKAMURA  Yoshihiro OKAMOTO  Hisashi OSAWA  Hajime AOI  Hiroaki MURAOKA  

IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.12   pp.1497-1503
Publication Date: 2013/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1497
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Elementary Technologies for Information Storage)
bit-patterned medium,  write-error,  non-binary low-density parity-check (LDPC) code,  iterative decoding,  

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Bit-patterned medium (BPM) is one of the promising approaches for ultra-high density magnetic recording systems. However, BPM requires precise write synchronization, and exhibits write-errors due to insufficient write field gradient, medium switching field distribution (SFD), demagnetization field from adjacent islands, and island position variation. In this paper, an iterative decoding system using a non-binary low-density parity-check (LDPC) code is considered for a BPM R/W channel with write-errors at an areal recording density of 2Tbit/inch2 including the coding rate loss. The performance of the iterative decoding system using the non-binary LDPC code over the Galois field GF(28) is evaluated by computer simulation, and it is compared with the conventional iterative decoding system using a binary LDPC code. The results show that the non-binary LDPC system has a larger write margin than the binary LDPC system.