Performance Evaluation of PRML System Based on Thermal Decay Model

Nobuhiko SHINOHARA  Keiko TAKEUCHI  Hisashi OSAWA  Yoshihiro OKAMOTO  Yasuaki NAKAMURA  Atsushi NAKAMOTO  Kenji MIURA  Hiroaki MURAOKA  Yoshihisa NAKAMURA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.8   pp.1583-1588
Publication Date: 2007/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.8.1583
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress of High-Density Information Storage)
Category: 
Keyword: 
thermal decay,  perpendicular magnetic recording,  adaptive equalization,  long-term BER performance,  

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Summary: 
The long-term bit error rate (BER) performance of partial response maximum likelihood (PRML) system using an adaptive equalizer in a perpendicular magnetic recording (PMR) channel with thermal decay is studied. A thermal decay model based on the experimental data giving the amplitude change of reproducing waveforms with the elapsed time for CoPtCr-SiO2 PMR medium is obtained. The BER performance of PR1ML channel for the 16/17(0,6/6) run-length-limited (RLL) code is evaluated by computer simulation using the model. The relationship between the ratio RJ of the jitter-like media noise power to the total noise power at the reading point and the required SNR to achieve a BER of 10-4 is also obtained and the performance is compared with that of the conventional equalization. The results show that the significant improvement in SNR by utilizing the adaptive equalization is recognized over all RJ compared with the conventional equalization.