Re: [Discuss-gnuradio] QPSK phase noise

[Paco Garcia]

For the plots I am just using the gr_plot_const.py FILENAME.dat where
FILENAME.dat comes from connnecting the block of interest using
self.connect(self.receiver, gr.file_sink(gr.sizeof_gr_complex,
"FILENAME.dat"))

For the costas loop and BPSK constellations I was using a custom script in
python that reads the output of a text file with the relevant information
after enabling the DEBUG line of the mpsk_receiver.cpp:

cl: phase_error: 0.000000  phase: 0.000000  freq: 0.000000  sample:
0.000000+j0.000000  constellation: 0.000000+j-1.000000
cl: phase_error: 0.000000  phase: 0.000000  freq: 0.000000  sample:
0.000000+j0.000000  constellation: 0.000000+j-1.000000
cl: phase_error: 0.000000  phase: 0.000000  freq: 0.000000  sample:
0.000000+j0.000000  constellation: 0.000000+j-1.000000
cl: phase_error: 0.000000  phase: 0.000000  freq: 0.000000  sample:
0.000000+j0.000000  constellation: 0.000000+j-1.000000

the script is  http://www.nabble.com/file/p23038239/plot_const.py
plot_const.py  for the const and 
http://www.nabble.com/file/p23038239/plot_error.py plot_error.py  for the
costas error.

Bill, have you already found anything wrong in the gr_mpsk_receiver.cc file?
I remember I could get much better constellation figures long time ago.

Cheers,
Paco.

 
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