Device for synchronizing branches of a Viterbi decoder included in a multidimensional trellis coded digital data receiver
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United States of America Patent
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May 26, 1998
Grant Date -
N/A
app pub date -
Sep 20, 1995
filing date -
Sep 27, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A branch synchronization device for multidimensional trellis coded digital data receivers using convolutional encoders includes a Viterbi decoder receiving two streams of symbols and supplying coded sequences and a time shifter for time shifting the symbol streams fed to the Viterbi decoder. The time shifter is controlled by a branch synchronization decision device generating a time shift control signal. The branch synchronization decision device cooperates with a calculator circuit receiving the coded sequences and supplying to the synchronization decision device an output signal of a first type if the coded sequences correspond to sequences such as would be obtained directly from the convolutional encoder and supplying an output signal of a second type if the coded sequences do not correspond to sequences that could have been obtained from the convolutional encoder. This output signal is fed to the branch synchronization device.
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