RE: [Discuss-gnuradio] Capturing data from various stages of modulationand demodulation

[Tom Rondeau]

> -----Original Message-----
> From: address@hidden [mailto:discuss-
> address@hidden On Behalf Of Naveen Manicka
> Sent: Sunday, January 14, 2007 8:01 PM
> To: address@hidden
> Subject: [Discuss-gnuradio] Capturing data from various stages of
> modulationand demodulation
> 
> Hi,
> 
> What would be the best way to capture the raw data as it is passed from
> each
> block within GNURadio and represent in a GUI form?
> Basically, if I send a "Hello World" from one machine to another, I can
> see
> it at the other end, but I am interested in somehow capturing and viewing
> the data as it passes through each stage in GNURadio, after I generate in
> the tunnel.py example.
> 
> Any views on how I could do this?
> I was exploring into representing the captured data as constellations, but
> didn't know if I was proceeding in the right path.
> 
> Thanks in advance,
> Naveen

Naveen,

All of the digital modulators have a 'log' flag you can enable, which will
drive every part of the modulator and demodulator to its own data file. If
you want to see the constellation, you can look at "rx_mpsk_receiver.dat" (I
think that's what it's called) using MATLAB/Octave and the
read_complex_binary function provided in the gnuradio-core/src/utils. This
returns a complex number, so plot(real(dat), imag(dat)).

Tom