It's not just an offset problem. Even though in the output file, there is a delayed sequence, it doesn't have the right bits. As it has exactly the same period it leads me to believe that it's just a problem of phase sync.
Attached is a minimal grc file. Cheers, Fabián On Wed, Oct 3, 2012 at 12:23 AM, Ben Reynwar <[email protected]> wrote: > 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 > > >
QAMMod.grc
Description: Binary data
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