1. Extraction of Timing Error Parameters From Readback Waveforms.
- Author
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Zeng, Wei, Kavcic, Aleksandar, and Motwani, Ravi
- Subjects
MAGNETIC recorders & recording ,RECORDING instruments ,MARKOV processes ,ALGORITHMS ,STOCHASTIC processes ,ALGEBRA - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2006
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