Traceback stage for a viterbi decoder
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Feb 18, 1997
filing date -
Oct 30, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a traceback unit for an M-step Viterbi decoder for a convolutionally encoded data stream, each of the traceback stages has a group of K input wires representing K possible candidate states. A bank of K multiplexers selects one of 2.sup.M of the input wires according to M bits of traceback data. The K multiplexer outputs feed a succeeding traceback stage. M groups of K wires carry the traceback data, with each wire being connected to a selection line of each multiplexer. At the output of the traceback unit an identification circuit identifies a subgroup of the K possibilities which has a maximum number of candidate states remaining therein. The arrangement obviates the need for retiming between every traceback stage.
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