The dvbt project im talking about is: https://github.com/gnuradio/gnuradio/tree/master/gr-dtv/lib/dvbt
And the gr-ieee-80211 project is: https://github.com/bastibl/gr-ieee802-11 thanks in advance 2016-01-28 19:11 GMT-03:00 Gonzalo Arcos <gonzaloarco...@gmail.com>: > I am trying to optimize the current performance of gr-iee802-11. Ive done > some profiling and came to the conclusion that there is a lot of work being > put in decoding the convolutional code at the receiver. > > I have done some research, and found out that there exists a viterbi > decoder that was developed for the digital tv branch, that supposedly > outperforms IT++ by a factor of 9x!, IT++ being the library that > gr-iee802-11 uses to decode the convolution. > > When trying to adapt this decoder to gr-iee802-11 ive found some hassles. > First, the constraint length for the viterbi decoder in dvbt is K = 7, > while in gr-ieee802-11 uses a constraint length of K=5. > In addition, the generator polynomials also differ. > > I would appreciate if someone could help me here, i am a beginner in the > matter of convolutional codes, i would like if someone could asses me if it > is possible to adapt this viterbi decoder to gr-iee802-11 at all, and in > case it is indeed possible, if it is very complex task for a non expert on > the matter. > > The source file d_viterbi.c has a comment that says: > That changing the polynomials would need me to "regenerate the BUTTERFLY > macro calls in viterbi()" I am not certain about what should the new > parameters be for the polinomials 0133 0171. > https://github.com/gnuradio/gnuradio/tree/master/gr-dtv/lib/dvbt >
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