On Tue, Dec 3, 2013 at 6:07 AM, kt7 <kartikset...@gmail.com> wrote: > Just a follow up. > I have noticed that data demodulation is intermittent, like if I execute the > same flowgraph a number of times sometimes I get a waveform after > demodulation but most of the time received scope is blank. > > I really have no explanation for this. > Any information regarding this would be really helpful > > Thanks in advance
Are you transmitting and receiving from the same BladeRF board? That could be problematic. Are you connecting them with a cable or using antennas? It's quite likely that the amplitude is way off. It could either be too much or too little for the demodulator. First, make sure you aren't sending in data that is too large, which could cause clipping and other non-linearities in the receiver. Second, make sure the signal is scaled to about +/-1 before going into the QAM demod block (by using an AGC block, for instance, or manually scaling the gain of your low pass filter). Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
