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Its very easy. Find some good Digital Electronics book. You will understand sequence detectors.
1. Draw a state machine.
2. Draw the state transition tables.
3. Draw K maps and get equations.
4. Draw Circuit.
In Viterbi decoding algorithm we use traceback mechanism. To start the traceback, you need to select the node with minimum path metric.
Now question is, what to do if minimum path metric value is available at more than 1 node? From which node shall I start traceback? Is it a random process...
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