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Help for Viterbi Decoder(URGENT!!)

Question asked by johnny on Jan 25, 2010
Latest reply on Jan 26, 2010 by johnny

I'm in last year of engineering studies. I've got a project in wich i have to simulate a satellite communication, with the DVB-S norm. I don't want to use the DVB-S library, the idea is to understand each part of the norm and evaluate its performances.
I'm trying to integrate the convolutional coder and his decoder, with the Viterbi algorithm. And this is with the ViterbiDecoder that I've got a problem, the output is always zero. I tried many types and it's always the same result. That's why I'm asking your help, I think I haven't really understood how it works on ADS. So if you've got advices it would be really helpful!!