On Thu, Mar 29, 2007 at 03:46:12PM +0100, eenrti wrote:
that is, can you please let me know of a reference or of a webpage or if
someone can tell me how to separate my output data for each channel?Thank you
Rigas
Hi Rigas,
I’m having a little bit of a problem understanding your question.
I think that you are using an external signal generator of some kind,
and then are trying to receive and process the signal using the USRP.
What daughterboard are you using?
Assuming that you are using a single Rx daughterboard, and that you
have connected a single output from your signal generator to that
daugtherboard, you can use the usrp_rx_cfile.py command to capture the
data and write it to a file. The file will contain binary
complex. That is, there will be an 32-bit float I, 32-bit
float Q, 32-bit float I, 32-bit float Q…
[eb@dee usrp]$ ./usrp_rx_cfile.py --help
usage: usrp_rx_cfile.py: [options] output_filename
options:
-h, --help show this help message and exit
-R RX_SUBDEV_SPEC, --rx-subdev-spec=RX_SUBDEV_SPEC
select USRP Rx side A or B (default=A)
-d DECIM, --decim=DECIM
set fgpa decimation rate to DECIM [default=16]
-f FREQ, --freq=FREQ set frequency to FREQ
-g GAIN, --gain=GAIN set gain in dB (default is midpoint)
-8, --width-8 Enable 8-bit samples across USB
–no-hb don’t use halfband filter in usrp
-s, --output-shorts output interleaved shorts in stead of complex
floats
-N NSAMPLES, --nsamples=NSAMPLES
number of samples to collect [default=+inf]
For example,
[eb@dee usrp]$ ./usrp_rx_cfile.py -R a -d 16 -f 2.41G -N 1M complex.dat
Be sure to to specify a frequency with -f that matches the
capabilities of the daughterboard. The signal at that center
frequency will end up at DC in the complex baseband output.
You can import the resulting data into octave or matlab by using the
read_complex_binary.m m-file in gnuradio-core/src/utils
Eric