Decoder for convolutionally encoded information

Details Decoder for convolutionally encoded information Decoder for convolutionally encoded information

1991-09-05

1993-07-20

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

341 94, 371 43, H03M 1312

Patent

active

052297675

ABSTRACT:
In a Viterbi Algorithm decoder (204) as used to decode convolutionally encoded information, reliability information is developed for various path discard decisions made within the Viterbi Algorithm. These decisions are made for discard opportunities that impact one or more error detection windows (601). Based upon these metrics, a reliability factor sequence can be provided and compared against a fixed (or varying) threshold. When unreliability appears, appropriate action can be taken. For example, all of the information can be discarded, or only certain portions of the information can be discarded, as appropriate to the particular application.

REFERENCES:
patent: 4110735 (1978-08-01), Maxemchuk
patent: 4119945 (1978-10-01), Lewis, Jr. et al.
patent: 4369512 (1983-01-01), Brossard et al.
patent: 4805174 (1989-02-01), Kubota et al.
patent: 4823346 (1989-04-01), Kobayashi et al.
patent: 5113400 (1992-05-01), Gould et al.

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