Re: [Discuss-gnuradio] DRM receive

[Martin Dvh]

Jiri Pittner wrote:
> Hi,
> 
> did somebody try to use gnuradio for receiving DRM (Digital Radio Mondiale)?
> It seems to me that neither M-QAM demodulation nor the apropriate audio codec
> is presently implemented in gnuradio, however, the DRM program "dream" has
> an option --fileio, which should be able to replace the sound card as the 
> source
> of the IF samples. So I think until everything is available in gnuradio, 
> it should be possible to do the RF processing with gnuradio (using basic-rx 
> and some preamplifier) and feed the frequency-translated data to dream, which 
> would do the rest.
> Does anybody know the format of the data which dream --fileio expects?
> Did somebody try this approach before, with/without success?
Yes I tried it.
Yes it works.

I think the format was complex signed 16 bit integer   (complex short)
(every sample is one signed 16 bit I value and one 16 bit signed Q value)

You can make these samples with
gr_complex_to_interleaved_short()

you can connect a gnuradio script to the drm receiver app with a pipe (use 
mkfifo for that)

pseudocode:

mkfifo my_drm_fifo

./usrp_receive_drm_samples_to_file.py --output-filename=my_drm_fifo 
--output-samplerate=samplerate_drm_expects

in another console
./drm --fileio my_drm_fifo


You can also search the gnuradio mailinglist for more info
> 
> Best regards,
> 
> Jiri
> 
> 
> 
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