Performance Improvement System for Perpendicular Magnetic Recording with Thermal Asperity

Yupin SUPPAKHUN; Pornchai SUPNITHI; Yoshihiro OKAMOTO; Yasuaki NAKAMURA; Hisashi OSAWA

doi:10.1587/transele.E94.C.1472

Performance Improvement System for Perpendicular Magnetic Recording with Thermal Asperity

Yupin SUPPAKHUN, Pornchai SUPNITHI, Yoshihiro OKAMOTO, Yasuaki NAKAMURA, Hisashi OSAWA

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In this paper, we propose a new method to estimate and effectively reduce the effect of thermal asperity (TA) in the perpendicular magnetic recording (PMR) channels with the state trellis. The TA is estimated from the state trellis, then its average is used to modify the equalized signal entering the Viterbi detector. For the partial response (PR) targets with DC component, the proposed method with a maximum-likelihood detector can improve the bit error rate performance by more than an order of magnitude when TA occurs and degrades when the giant magneto-resistive (GMR) nonlinearity and base line wander (BLW) effects are present. Unlike the previous studies, this method allows the use of PR targets with DC component under the presence of TA.

Publication: IEICE TRANSACTIONS on Electronics Vol.E94-C No.9 pp.1472-1478

Publication Date: 2011/09/01

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Online ISSN: 1745-1353

DOI: 10.1587/transele.E94.C.1472

Type of Manuscript: PAPER

Category: Storage Technology

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Yupin SUPPAKHUN, Pornchai SUPNITHI, Yoshihiro OKAMOTO, Yasuaki NAKAMURA, Hisashi OSAWA, "Performance Improvement System for Perpendicular Magnetic Recording with Thermal Asperity" in IEICE TRANSACTIONS on Electronics, vol. E94-C, no. 9, pp. 1472-1478, September 2011, doi: 10.1587/transele.E94.C.1472.
Abstract: In this paper, we propose a new method to estimate and effectively reduce the effect of thermal asperity (TA) in the perpendicular magnetic recording (PMR) channels with the state trellis. The TA is estimated from the state trellis, then its average is used to modify the equalized signal entering the Viterbi detector. For the partial response (PR) targets with DC component, the proposed method with a maximum-likelihood detector can improve the bit error rate performance by more than an order of magnitude when TA occurs and degrades when the giant magneto-resistive (GMR) nonlinearity and base line wander (BLW) effects are present. Unlike the previous studies, this method allows the use of PR targets with DC component under the presence of TA.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E94.C.1472/_p

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@ARTICLE{e94-c_9_1472,
author={Yupin SUPPAKHUN, Pornchai SUPNITHI, Yoshihiro OKAMOTO, Yasuaki NAKAMURA, Hisashi OSAWA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Performance Improvement System for Perpendicular Magnetic Recording with Thermal Asperity},
year={2011},
volume={E94-C},
number={9},
pages={1472-1478},
abstract={In this paper, we propose a new method to estimate and effectively reduce the effect of thermal asperity (TA) in the perpendicular magnetic recording (PMR) channels with the state trellis. The TA is estimated from the state trellis, then its average is used to modify the equalized signal entering the Viterbi detector. For the partial response (PR) targets with DC component, the proposed method with a maximum-likelihood detector can improve the bit error rate performance by more than an order of magnitude when TA occurs and degrades when the giant magneto-resistive (GMR) nonlinearity and base line wander (BLW) effects are present. Unlike the previous studies, this method allows the use of PR targets with DC component under the presence of TA.},
keywords={},
doi={10.1587/transele.E94.C.1472},
ISSN={1745-1353},
month={September},}

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TY - JOUR
TI - Performance Improvement System for Perpendicular Magnetic Recording with Thermal Asperity
T2 - IEICE TRANSACTIONS on Electronics
SP - 1472
EP - 1478
AU - Yupin SUPPAKHUN
AU - Pornchai SUPNITHI
AU - Yoshihiro OKAMOTO
AU - Yasuaki NAKAMURA
AU - Hisashi OSAWA
PY - 2011
DO - 10.1587/transele.E94.C.1472
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E94-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2011
AB - In this paper, we propose a new method to estimate and effectively reduce the effect of thermal asperity (TA) in the perpendicular magnetic recording (PMR) channels with the state trellis. The TA is estimated from the state trellis, then its average is used to modify the equalized signal entering the Viterbi detector. For the partial response (PR) targets with DC component, the proposed method with a maximum-likelihood detector can improve the bit error rate performance by more than an order of magnitude when TA occurs and degrades when the giant magneto-resistive (GMR) nonlinearity and base line wander (BLW) effects are present. Unlike the previous studies, this method allows the use of PR targets with DC component under the presence of TA.
ER -