Viterbi decoder for decoding depunctured code

Details Viterbi decoder for decoding depunctured code Viterbi decoder for decoding depunctured code

1997-07-01

1999-07-27

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375261, 375265, 371 43, 371 436, H04L 512

Patent

active

059302984

ABSTRACT:
A Viterbi decoder for decoding depunctured code comprises a branch metric calculation unit; an add/ comparison/ selection unit; a path metric network; a survivor memory unit; a decoding depth control unit; and a decoded symbol selection unit. The decoding depth control unit outputs a decoding depth control signal by determining a decoding depth having the least bit error rate according to code rates of punctured codes. The decoding depth having the least bit error rate is set to a maximum value of integer times or integer+1 times of each code rate's numerators of the punctured codes within a range of a predetermined decoding depth. Accordingly, the Viterbi decoder recovers the original information without the need to expand the conventional survivor memory required for a trace back process in the system using the puncturing technique.

REFERENCES:
patent: 5418795 (1995-05-01), Itakura et al.
patent: 5432803 (1995-07-01), Liu et al.
patent: 5509020 (1996-04-01), Iwajiri et al.
patent: 5548684 (1996-08-01), Wang et al.
patent: 5717471 (1998-02-01), Stewart

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