Method and apparatus for Viterbi synchronization

Details Method and apparatus for Viterbi synchronization Method and apparatus for Viterbi synchronization

2007-01-09

2007-01-09

Burd, Kevin (Department: 2631)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S262000

Reexamination Certificate

active

10098282

ABSTRACT:
Method and apparatus are described for determining when a convolution decoder is out of synchronization. Normalizations from a convolutional decoder are counted to provide a normalization count, and errors from the convolutional decoder are counted to provide an error count. One of the normalization count and the error count is compared to a first threshold associated with the selected one of the normalization count and the error count. The other of the normalization count and the error count is compared to a second threshold in response to meeting the first threshold, such as bit errors per X normalizations or normalizations per Y bit errors. From this latter comparison, an indicator is generated as to whether the convolutional decoder is synchronized or not.

REFERENCES:
patent: 5463403 (1995-10-01), Walker et al.
patent: 6546524 (2003-04-01), Chankramath et al.
patent: 2002/0191716 (2002-12-01), Xia et al.
patent: 2003/0142728 (2003-07-01), Lin
Qualcomm ASIC Products; “Forward Error Correction Data Book”; 80/24128-1; Feb. 1997; Available from QUALCOMM Incorporated; pp. 1-4 through 1-22.

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