> What I meant was that you plot the result of your timing + phase recovery
> into an XY plot, that would take care of those additional points you're seeing. I have to confess that I don't even know what that means or how to go about accomplishing it. I have to take baby steps because I'm a baby. ;-) If you could point me to an example or some other things to try, that would be helpful. I looked through the examples that ship with GNURadio and didn't see anything obvious. Also, I looked through the GRC block tree to see if I could try something. There's a Synchronizers section. Something from there? You thought maybe it was oversampled. It occurred to me that maybe the X-Y chart rate should be samp_rate/8, but I tried that and the chart still look largely the same. mlist_qam_constellation_xy.grc.png -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Martin Braun Sent: Friday, July 17, 2015 1:20 PM To: [email protected] Subject: Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink On 17.07.2015 12:43, Bill Eaton wrote: > From Martin Braun: > >>My preference is to build the demod/sync chain with it's own blocks, >>and then just output the complex symbols > >> into either an X/Y plot (WX) or the QT Constellation Sink > > Even an X/Y plot ends up looking funny. I've attached a GRC file for > X-Y, and when you turn on persistence, it looks better. But it's very > strange. Maybe my bits_per_symbol is wrong. Or maybe the sample rate > for the X-Y chart should be different than the random sample rate? > Here's the 4 QAM X-Y. Your plot looks fine, it's just oversampled (but perfectly time-synchronized, I'm guessing this is post-pulse shaping + noise?). What I meant was that you plot the result of your timing + phase recovery into an XY plot, that would take care of those additional points you're seeing. M _______________________________________________ Discuss-gnuradio mailing list <mailto:[email protected]> [email protected] <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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