Adaptive equalizer for removing nonlinear distortions from digit

Details Adaptive equalizer for removing nonlinear distortions from digit Adaptive equalizer for removing nonlinear distortions from digit

1992-05-29

1994-09-06

Canney, Vincent P.

Excavating

360 45, 371 44, G06F 1110

Patent

active

053454529

ABSTRACT:
An adaptive equalizer of the present invention equalizes a data symbol sequence containing intersymbol interference and nonlinear distortions extending over several symbols, e.g., a digital signal from the read head of a high density magnetic recording and playback apparatus, thereby producing an equalized output free from such distortions. Presumed value storing means stores a plurality of presumed value signals read out of the combinations of an equalization address signal and a Viterbi transition symbol sequence signal. Error calculating means outputs a plurality of error signals representative of differences between the plurality of presumed value signals and an input data symbol. Viterbi algorithm equalizing means executes equalization according to a Viterbi algorithm and by using the plurality of error signals as branch metrics, thereby producing a presumed symbol associated with the input data symbol, the equalization address signal, and a correction address signal. Correcting means updates the presumed value signal of the presumed value signal storing means designated by the correction address signal with the input data symbol.

REFERENCES:
patent: 5089917 (1992-02-01), Kanota et al.
patent: 5220570 (1993-06-01), Lou et al.
patent: 5263033 (1993-11-01), Seshadri
G. David Forney, Jr., "Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference," IEEE Trans. Inform. Theory, vol. IT-18, No. 3, May, 1972.
Alexandra Duel--Hallen et al, "Delayed Decision-Feedback Sequence Estimation", IEEE Tran. commu. pp. 428, vol. 37, May 1989.
Kevin Fisher, John Cioffi, and C. M. Melas, "An Adaptive DFE for Storage Channels Suffering from Nonlinear ISI", Globalcom 1989, 53.7.1.

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