I've added two of my projects to CGRAN: simple_ra and gr_iqtx
simple_ra is intended as an ultimate replacement for
gr-radio-astronomy--it's based on GRC.
https://www.cgran.org/wiki/simple_ra
gr_iqtx is conceptually similar to the UHD 'tx_samples_from_file'
example, but with graphical bits, and it also does things on the receive
path, to act as a kind of engineering monitor. I developed this as a
"quicky" for someone in Denmark who's running a DAB+ broadcasting
service, and was having some problems. It grew to the point where it
was a real project, so I put it up on CGRAN. Among other things,
the RX-side baseband is copied to an external FIFO, and there's a C
program, "cadence" that is used to measure the timing cadence of
the DAB/DAB+ "frames". The stats computed by "cadence" are fed-back
into the flow-graph and displayed in an "analysis" pane. It also
includes a coarse "premphasis" equalizer to compensate for the
band-shape produced by the interpolator on the USRP hardware--it can
be turned on or off. It also includes the ability to inject a pair
of narrowband tones, offset from either band edge, to aid in transmitter
diagnosis. The idea behind the structure is that one might "plug in"
different types of analysis tools (even another Gnu Radio flow-graph)
to provide signal-quality statistics for whatever
modulation/packetizing/etc scheme is in use. Very much geared towards
the broadcast
industry, but who knows how it might evolve?
https://www.cgran.org/wiki/gr_iqtx
Cheers
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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