Effect for Jitter Noise with NPML Detector in Perpendicular Recording Channels

Abstract

Jitter noise was the noise that is intrinsic to the data. Due to the location of the transition process in writing. This is not a general effect on the circuit. Generally, magnetic recording channel detectors has reading signal of transition position and suffer from jitter noise. In general, a partial-response maximum-likelihood (PRML) detector works reliably well when a magnetic recording channel experienced additive white Gaussian noise (AWGN). At ultra high recording densities, the recording channel will face with both colored noise and jitter noise. Thus, lowering the performance of the PRML detector. Therefore, in this case, the PRML detector has been replaced by a noise-predictive maximum-likelihood (NPML) detector. it is well-known that NPML detector embeds the noise predictor in the PRML detector has  been proposed to combat the colored noise. Nonetheless, the conventional NPML detector cannot combat the jitter noise. As a result, this paper presents a method of designing a new NPML detector that can deal with the jitter noise. Simulations show that the new NPML detector performs better than the conventional NPML detector, especially at high media jitter noise levels and high signal-to-noise ratio (SNR).