Adaptive viterbi detector

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

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371 43, H04L 2706

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active

054616441

ABSTRACT:
Viterbi detector for a channel having a memory length 1, where no more than two survivors with an associated difference metric are updated. In the prior-art Viterbi detector of this type the new difference metric is from the previous difference metric by use of a saturation function. If the channel parameters differ from the values assumed for the calculation of the difference metric, the performance of the prior-art detector will rapidly degrade. In the detector according to the invention the new difference metric is derived from a combination of the saturation function of the previous difference metric and a correction signal which is a measure for the channel parameter difference.

REFERENCES:
patent: 4847871 (1989-07-01), Matsushita et al.
patent: 5131011 (1992-07-01), Bergmans et al.
patent: 5285480 (1994-02-01), Chennakeshu et al.
patent: 5332402 (1994-06-01), Ushirokawa
Wood et al., "Viterbi Detection of Class IV Partial Response on a Magnetic Recording Channel", IEEE Transactions on Communications, vol. COM-34, No. 5, May 1986, pp. 454-461.
Bellanger et al., Adaptive Digital Filters & Signal Analysis, Chap. 4: Gradient Adaptive Filters, pp. 97-130.
Bergmans et al., "On the Use of Decision Feedback for Simplifying The Viterbi Detector", Philips J. Res. Vo. 42, No. 39, 1987, pp. 399-428.

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