Adaptive viterbi detector

Details Adaptive viterbi detector Adaptive viterbi detector

1993-06-02

1995-04-18

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375348, 371 43, H04L 100

Patent

active

054085039

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 derived using a saturation function from the previous difference metric. If the amplitude of the received signal differs 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 saturation function of the previous difference metric, with the size of the linear region being dependent on the magnitude of the amplitude of the received signal.

REFERENCES:
patent: 4847871 (1989-07-01), Matsushita et al.
patent: 4885757 (1989-12-01), Provence
patent: 5081651 (1992-01-01), Kubo
patent: 5131011 (1992-07-01), Bergmans et al.
patent: 5263053 (1993-11-01), Wan et al.
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 1985, pp. 454-461.
Bellanger et al., "Gradient Adaptive Filters", Chapter 4, pp. 97-130.
Bergmans et al., "On the use of decision feedback for simplifying the viterbi detector", Philips J. Res., vol. 42, No. 4, 1987, pp. 399-428.

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