Hello,
So I've been working on writing the QAM demodulation blocks.
What I have so far works in a simulation, but fails between two
actual USRPs: the constellation spins and spins, occasionally locking
when the frequencies get close enough and then breaking again.
I was wondering if anyone knew better constants to use for the
alpha/beta/mu/omega greek alphabet soup, because otherwise it's pretty
much a six-dimensional optimization problem.
The latest version of the patch is available at
http://www.cae.wisc.edu/~masond/gr-qam-patch-rev3.diff
(the changes I made to gr_feedforward_agc.cc *may* affect other blocks,
but the way it was working before was too much like hard compression.)
--Mason
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