Viterbi decoder and viterbi decoding method

Details Viterbi decoder and viterbi decoding method Viterbi decoder and viterbi decoding method

1997-11-18

2000-11-14

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, H04L 2706

Patent

active

061480436

ABSTRACT:
In a branch metric calculating circuit, using a sample value `y` input from an A/D converter and reference levels {-1, -1/2, 1/2, 1}, branch metric calculation is performed by squaring a difference between the sample value `y` and each of the reference levels and subtracting the square of the sample value `y` from the resultant value of squaring the difference. Since actual calculation is carried out for values 2y, y-3/4, -y-3/4 and -2y in this arrangement, square operation circuits can be eliminated, thereby making it possible to simplify a configuration of a Viterbi decoder.

REFERENCES:
patent: 5287385 (1994-02-01), Sugawara et al.
patent: 5608737 (1997-03-01), Kimura et al.
patent: 5781590 (1998-07-01), Shiokawa et al.
patent: 5907586 (1999-05-01), Katsuragawa et al.

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