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Noise-predictive maximum-likelihood method combined with infinite impulse response equalization

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2 Author(s)
Younggyun Kim ; Dept. of Electr. & Comput. Eng., Minnesota Univ., Minneapolis, MN, USA ; Jaekyun Moon

An infinite impulse response (IIR) can closely approximate the high density magnetic recording channel response with only a single pole and a small number of zeros. As a consequence, a near-optimal performance can be achieved with the Viterbi algorithm (VA) incorporating a single-tap noise predictor. The number of states in the VA trellis is determined by the number of zeros used in the IIR modeling of the channel response. The single noise-predictor tap corresponds to the single pole in the IIR model. The overall complexity for a given level of performance is smaller with this approach than with the noise-predictive maximum-likelihood (NPML) method based on conventional partial response equalization

Published in:

IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 6 )