Jeffrey Karrels wrote: > Hello everyone. > > I am looking at the frequency correction burst of a GSM signal. > According to spec the original data defines 148 bits of 0 that are > differentially encoded and GMSK modulated. After the data goes > through the differential encoder it ends up as [-1,1,1, (142 1s), > 1,1,1]. I have taken this burst and plotted I vs Q (which is > attached). I was expecting to see the amplitude ramp up followed by a > negative pi/2 phase shift, followed by 147 positive pi/2 phase shifts, > and a ramp down. I never see the initial negative phase shift though. > Am I missing something in my sanity? Any thoughts or ideas?
Its hard to read the graph like that. Plot angle vs time or even better, derivative of angle vs. time. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
