Trace-back method and apparatus for use in a viterbi decoder

Details Trace-back method and apparatus for use in a viterbi decoder Trace-back method and apparatus for use in a viterbi decoder

1997-06-16

1999-03-02

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 436, 371 437, H03M 1312

Patent

active

058780920

ABSTRACT:
A trace-back apparatus to select a most likely path for use in a Viterbi decoder comprises one or more processing elements to carry out tracing-back based on a sequence of decision vectors coupled among themselves in a pipeline fashion. In each processing element, N number of decision vectors are delayed during a predetermined period to generate 1-step to N-step delayed decision vectors; and an input state is stored during the predetermined period to generate an 1-step delayed state; and multiplexing means multiplexs sequentially the 1-step to N-step delayed decision vectors based on the 1-step delayed state to provide an N-step trace-back state to the next processing element.

REFERENCES:
patent: 4571734 (1986-02-01), Dolivo et al.
patent: 5329537 (1994-07-01), Alard et al.
patent: 5511080 (1996-04-01), Itoi et al.
patent: 5712880 (1998-01-01), Rim et al.

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