Impact of amplitude asymmetry on partial response (PR4 and EPR4) channels

Author

Stupp, Steven E.

Author_Institution

Quantum Corp., Milpitas, CA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2313

Lastpage

2315

Abstract

The dependence of MSE and marginalized BER on amplitude asymmetry for two partial response channels is reported. To eliminate the impact of variations in other head parameters, we varied the bias point of a given head using an external magnetic field. We find that the MSE degrades continuously as the magnitude of the amplitude asymmetry is increased; the marginalized BER is at most weakly dependant on amplitude asymmetry for magnitudes less than 15%. At larger magnitudes the channel performance is more severely impacted, Finally, we were able to simulate these results using a simplified model of the read channel

Keywords

magnetic heads; magnetic recording; magnetoresistive devices; mean square error methods; partial response channels; EPR4 channel; MSE; PR4 channel; amplitude asymmetry; bias point; channel performance; external magnetic field; head parameters; marginalized BER; partial response channels; read channel; simplified model; Anisotropic magnetoresistance; Bit error rate; Degradation; Gain; Magnetic fields; Magnetic heads; Partial response channels; Performance evaluation; Pulse measurements; Solenoids;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800810

Filename

800810