Effect of cutoff frequency of lowpass filter on the performance of perpendicular magnetic recording channel

Abstract

In this paper, the effect of cutoff frequency of the front-end low-pass filter on the performance of
perpendicular recording channel is investigated. With positive and negative deviation from the nominal value,
the partial –response maximum–likelihood (PRML) system shows more degradation by the positive deviation
than the negative one. The noise-predictive maximum–likelihood (NPML) system shows the results otherwise.