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Extraction of timing error parameters from readback waveforms

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3 Author(s)
Wei Zeng ; DEAS, Harvard Univ., Cambridge, MA, USA ; Kavcic, A. ; Motwani, R.

In this paper, we consider the problem of modeling the timing error process in magnetic recording systems. We propose a discrete-valued Markov model for the timing error process, and design two methods (data-aided and nondata-aided), based on the Baum-Welch algorithm, to extract the model parameters from the readback waveforms. The channel model we consider is an intersymbol interference (ISI) channel with additive Gaussian noise. The continuous-time readback signal at the output of the channel is sampled at baud-rate. Simulation results show that the estimated parameters are close to the actual values and the convergence is attained in a few iterations of the Baum-Welch algorithm. We also demonstrate the usefulness of the accurate model extraction by comparing a fine-tuned Markov timing recovery loop to the standard Mueller and Muller detector with a tuned second-order loop filter.

Published in:

Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 2 )

Date of Publication:

Feb. 2006

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