My question to all of you responding on this question then is: How do I convert the amplitudes of my GMSK signal to probabilities for viterbi based demodulation?
Isaac Steven Clark-2 wrote: > > On Thu, Jun 5, 2008 at 7:45 AM, isaacgerg <[EMAIL PROTECTED]> wrote: >> >> Hi, >> Concerning GSM GMSK demodulation, due to the ISI, I initially thought >> many >> folks were using the Viterbi algorithm on the waveform to demodulate it >> properly. After doing some lit review, I am finding that this is not the >> case and that when most folks talk about Viterbi concerning GSM GMSK >> demodulation, they are referring to undoing the convolution encoding and >> not >> referring to demodultion in the face of ISI. Can anyone please confirm >> this? >> >> I see many demodulators simply just ignoring the ISI and just >> demodulating >> as if it wasnt present. It seems they just rely on the convolutional >> encoding for error correction and therefore dont need to worry about the >> ISI......Is this true? > > What you have said is true in my experience as well. More often than > not, Viterbi decoding is just used as part of the forward error > correction scheme. > > Please look for my next email to the mailing list for an alternate > GMSK demodulator that reduces ISI... > > -Steven > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/gsm-gmsk-demodulation-tp17667993p17731307.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
