Novel soft-feedback equalization method for multilevel magnetic recording

Conference paper


Shah, P., Ahmed, M., Ambroze, M., Tjhai, C. and Davey, P.J. 2007. Novel soft-feedback equalization method for multilevel magnetic recording. Tenth joint Magnetism and Magnetic Materials - International Magentics (MMM–INTERMAG) conference. Baltimore, Maryland, USA 07 - 11 Jan 2007 IEEE. https://doi.org/10.1109/TMAG.2007.894010
TypeConference paper
TitleNovel soft-feedback equalization method for multilevel magnetic recording
AuthorsShah, P., Ahmed, M., Ambroze, M., Tjhai, C. and Davey, P.J.
Abstract

This paper investigates the use of multilevel modulation for magnetic recording using a novel soft-feedback equalization (SFE) approach. Different aspects of investigation are 1)multilevel recording, 2) SFE, and 3) application of turbo codes. The SFE scheme is a model in which the partial response (PR) equalizer and maximum a posteriori (MAP) decoder are replaced by a linear filter with an iterative MAP decoder. Error correction codes (ECCs) are applied to the multilevel recording system in order to achieve very low error rates. Implementation of the SFE scheme for multilevel recording shows a reduction in complexity in comparison to various PRML schemes. The simulation results show a clear performance gain of multi-level-coded against binary-coded recording systems. At higher signal-to-noise ratio (SNR), the coded multilevel SFE scheme overcomes the error floor effect produced in the coded multilevel PRML scheme, which is caused by minimum distance error events. Overall, this paper proposes the use of coded multilevel recording with SFE scheme at lower rates rather than coded binary recording at higher densities in order to achieve similar performance

Keywordserror correction codes (ECCs); longitudinal recording; magnetic recording; multilevel; maximum a posteriori (MAP); noise coloration; PRML; soft feedback equalization (SFE)
Research GroupSensoLab group
LanguageEnglish
ConferenceTenth joint Magnetism and Magnetic Materials - International Magentics (MMM–INTERMAG) conference
Proceedings TitleIEEE Transactions on Magnetics
ISSN0018-9464
Electronic1941-0069
PublisherIEEE
Publication dates
Online21 May 2007
PrintJun 2007
Publication process dates
Deposited03 May 2011
Output statusPublished
Copyright Statement

Post refereed version as permitted by publisher.
© 2007 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Digital Object Identifier (DOI)https://doi.org/10.1109/TMAG.2007.894010
Scopus EID2-s2.0-34249101839
Web of Science identifierWOS:000246706200066
Web address (URL) of conference proceedingshttps://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=4202640&punumber=20
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