A study of PRML systems by write and read equalization

Author

Okamoto, Y. ; Ichihara, K. ; Osawa, H.

Author_Institution

Dept. of Electr. & Electron. Eng., Ehime Univ., Matsuyama, Japan

Volume

31

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

1077

Lastpage

1082

Abstract

A new partial response (PR) channel which contains the write equalizer in addition to conventional PR channel is proposed. Our write equalizer outputs DC-free waveforms of two levels. Our read equalizer can reduce high-frequency noise, and what is more, it has little degradation of eye opening. The PR channels in combination with Viterbi decoder give partial response maximum-likelihood (PRML) systems which exhibit a good performance. The bit error rates for several PRML systems are obtained by computer simulation, where a Lorentzian channel with additive white Gaussian noise is assumed. The results shows that PR(1,1,-1,-1) system has an excellent performance in high density recording for a system in which the small transition spacings required by our write equalization is allowed.<>

Keywords

Gaussian noise; Viterbi decoding; digital magnetic recording; magnetic recording noise; maximum likelihood detection; partial response channels; white noise; DC-free waveforms; Lorentzian channel; PRML systems; Viterbi decoder; additive white Gaussian noise; bit error rates; computer simulation; digital magnetic recording; eye opening degradation; high density recording; high-frequency noise; partial response channel; partial response maximum-likelihood; read equalization; transition spacings; write equalization; Additive white noise; Bit error rate; Computer simulation; Degradation; Equalizers; Magnetic recording; Maximum likelihood decoding; Propagation delay; Space vector pulse width modulation; Viterbi algorithm;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364788

Filename

364788