traceback length in convolutional coding

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pinkyvidya

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How is traceback length determined in convolutional coding?Is it 5 times the constraint length.Are there any other parameters to define it?
plz help
 

Sir i went through the paper......but still.................Can it be concluded as traceback length depends only on constraint length.
so if constraint length is 7 then traceback length is 35..................but then the BER will be zero which is not practicable right?

please help
 

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