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Data-Aided Timing Recovery for Recording Channels With Data-Dependent Noise

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4 Author(s)
Riani, J. ; Eindhoven Univ. of Technol. ; Bergmans, J.W.M. ; van Beneden, S. ; Immink, A.

In high-density data storage systems, noise becomes highly correlated and data dependent as a result of media noise, channel nonlinearities, and front-end filters. In such environments, conventional timing recovery schemes will exhibit large residual timing jitter and, especially, data-dependent timing jitter. This paper presents a new data-aided timing recovery algorithm for data storage systems with data-dependent noise. We derive a maximum-likelihood timing recovery scheme based on a data-dependent Gauss-Markov model of the noise. The timing recovery algorithm incorporates data-dependent noise prediction parameters in the form of linear prediction filters and prediction error variances. Moreover, because noise can be nonstationary in practice, we propose an adaptive algorithm to estimate and track the noise prediction parameters. Simulation results, for an idealized optical storage channel incorporating a simple model of media noise, illustrate the merits of our algorithm

Published in:

Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 11 )

Date of Publication:

Nov. 2006

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