Two new projects on CGRAN

GNU Radio
1

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 L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

2

On Sun, Oct 16, 2011 at 5:52 PM, Marcus D. Leech [email protected]
wrote:

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_rahttps://www.cgran.org/wiki/simple_ra

Great, Marcus, thanks!

If this replaces gr-radio-astronomy, should we take that out of the
tree? We
were going to have to update it for UHD use fore 3.5, anyways.

Tom

3

Tom

I have no concept of who might still be using gr-radio-astronomy. It
hasn’t been updated in years

If nobody is using it then it can be removed

–
Principal Investigator
Shirleys Bay Radio
Astronomy Consortium

4

Thanks. We’ll probably remove it from 3.5, then, and make a note of
where to
find the new version.

I think it makes more sense, anyways, to have applications like this out
of
tree.

Tom

5

Thanks. We’ll probably remove it from 3.5, then, and make a note of
where to find the new version.

I think it makes more sense, anyways, to have applications like this
out of tree.

Tom

Yup, perfectly acceptable to me.

–
Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium