Fixed sample rate Bayesian detector in a variable speed magnetic channel

Author

Smith, Daniel F. ; Donnelly, T. ; Mapps, D.J.

Author_Institution

Centre for Res. in Inf. Storage Technol., Plymouth Univ., UK

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

2797

Lastpage

2799

Abstract

A new design of blind equalizer is proposed that can decode a magnetic binary channel whose bit-rate is unknown. It is shown that the velocity can be estimated from information already known from a fixed delay tree search (FDTS) decision feedback equalizer (DFE) structure. Converting this detector to a Bayesian scheme with an appreciation of non-linear distortion in the read head modestly improves the velocity stability. The acquisition time for the channel speed is linear and rapid: a 50% change in velocity can be accommodated in fewer than 150 magnetic flux transitions. Results with real signals from a high-density magnetic credit card are provided

Keywords

Bayes methods; decision feedback equalisers; magnetic recording; signal detection; blind equalizer; decision feedback equalizer; decoder; fixed delay tree search; fixed sample rate Bayesian detector; magnetic credit card; magnetic flux transition; nonlinear distortion; read head; variable speed magnetic binary channel; velocity stability; Bayesian methods; Blind equalizers; Decision feedback equalizers; Decoding; Delay estimation; Detectors; Magnetic flux; Magnetic heads; Nonlinear distortion; Stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617734

Filename

617734