Performance of GPRML-AR system in perpendicular magnetic recording channel with thermal decay

N. Shinohara, H. Osawa, Y. Okamoto, Y. Nakamura, K. Miura, H. Muraoka, Y. Nakamura

Research output: Contribution to journalArticle

Abstract

The bit-error rate (BER) performance of the generalized partial response maximum likelihood with autoregressive (GPRML-AR) channel model system in perpendicular magnetic recording (PMR) channel with thermal decay is obtained. The 128/130(0,16/8) run-length-limited (RLL) code is used as a recording code. The GPR channel consists of the PR1 channel followed by the reduction circuit of predicted noise. The BER performance is evaluated by computer simulation using a thermal decay model. The model has been obtained by using an approximate equation that represents amplitude degradation of the reproducing waveform with elapsed time based on the experimental data for CoPtCr-SiO2 PMR media. The Viterbi detector with an AR channel model is employed. Furthermore, long-term degradation of the required SNR to achieve a BER of 10-4 with elapsed time is obtained and the performance is compared with that of PR1ML system. The results show that the poorer the thermal stability of the medium becomes, the larger the SNR gain of the GPR1ML-AR system over the PR1ML system becomes. The SNR gain also increases with elapsed time.

Original languageEnglish
Pages (from-to)3136-3139
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume320
Issue number22
DOIs
Publication statusPublished - 2008 Nov 1

Keywords

  • GPRML-AR system
  • Perpendicular magnetic recording
  • RLL code
  • Thermal decay

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Shinohara, N., Osawa, H., Okamoto, Y., Nakamura, Y., Miura, K., Muraoka, H., & Nakamura, Y. (2008). Performance of GPRML-AR system in perpendicular magnetic recording channel with thermal decay. Journal of Magnetism and Magnetic Materials, 320(22), 3136-3139. https://doi.org/10.1016/j.jmmm.2008.08.025