On Mon, Oct 1, 2012 at 1:27 PM, Fabián Kozynski <[email protected]> wrote: > As sanity check I'm trying a simple flowgraph in GRC with a QAM mod/demod: > > Vector Source ==> Throttle ==> QAM Mod ==> QAM Demod ==> Unpacked to Packed > ==> File Sink > > The parameters in the mod/demod are as default. I also have a File Sink > before the mod. > > In the output I see first a bunch of zeros, then a bunch of random numbers > and after 20 or so bytes I get a sequence with the same period as the > original one, but different numbers. I suppose this is a problem of phase > sync. > > What's the right way to simulate a simple mod/demod? How do I add sync > between mod and demod? > > Thanks, > Fabián
It sounds like you're comparing bytes in the two files. First thing that I'd check is that the two files aren't offset from each other by a few bits so that the bytes don't line up in the same way. If that's not the problem then email me the grc file and I'll have a look. Cheers, Ben > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
