Method and apparatus for generating branch metrics and branch in

Details Method and apparatus for generating branch metrics and branch in Method and apparatus for generating branch metrics and branch in

1997-03-19

1999-10-19

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 30, 371 437, H03D 100

Patent

active

059701048

ABSTRACT:
A Viterbi decoder generates a branch metric table from first and second data signals taken at two sample times and provides selected branch metrics to an add/compare/select circuit in response to branch indices from a branch index generator. The branch metrics in the branch metric table are the sixteen combinations of the sum of the first and second parallel data signals at first and second sample times and the inverse of such signals. The branch index generator generates the branch indices in response to a received state from the add/compare/select circuit, convolutional code polynomials and the possible states of a radix-4 trellis. The add/compare/select generates a survivor path decision based on the selected branch metrics.

REFERENCES:
patent: 4536878 (1985-08-01), Rattlingourd et al.
patent: 4748626 (1988-05-01), Wong
patent: 4757506 (1988-07-01), Heichler
patent: 5390198 (1995-02-01), Higgins
patent: 5594742 (1997-01-01), Hemmati
patent: 5742622 (1998-04-01), Claydon et al.

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