Reducing the Thermal Asperity Effect in Perpendicular Magnetic Recording System

Yupin Suppakhun

doi:10.4028/www.scientific.net/AMR.931-932.1260

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 931-932Reducing the Thermal Asperity Effect in...

Reducing the Thermal Asperity Effect in Perpendicular Magnetic Recording System

Abstract:

In this paper, we propose a new method to estimate and reduce effectively thermal asperity (TA) in the perpendicular recording channels with state trellis. The proposed method comprises of recursively applying a previous noise estimate to a calculation of a current noise estimate to eliminate the effects of TA from the equalized signal. With partial response a maximum-likelihood detector base on partial-response (PR) target with DC-full component can improve the system performance by more than 50% when TA occurs. Unlike previous studies of TA cancellation or suppression, this method is different because we dont use PR targets with non-dc components and high pass filter.

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Periodical:

Advanced Materials Research (Volumes 931-932)

Pages:

1260-1264

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.931-932.1260

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Online since:

May 2014

Authors:

Yupin Suppakhun*

Keywords:

Perpendicular Magnetic Recording, Thermal Asperity Estimate, Trellis, Viterbi Detector

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