Forum: GNU Radio DAB, RDS, DRM, HDradio and OFDM

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Martin D. (Guest)
on 2007-06-04 03:48
(Received via mailing list)
Hi all,
Is anybody working on DAB, RDS,DRM, HDradio or OFDM at the moment.
I will probably be working on all of these in the near future and was
wondering what the status is of these and where to find what.

I know there is some OFDM stuff in svn.
Can anybody tell me about the status of it.

There were some RDF implementations on the list a while back.
people working on it: Ronnie Gaensli, and later adapted
by Ryan Shoff and later by matteo Campanella
http://digilander.libero.it/iz2eeq/#rds
The FMradio guts in gnuradio-core ( wfm_rcv_pll.py) also makes  a
reference to RDS but the above implementation seems to not use this.
I don't think there is actual RDS code in svn is there?

There is some DAB work done by Jens Elzner on:
http://www.1c3.de/dab/
But I don't know if anything is in gnuradio svn yet.

The only thing I could find on hdradio and gnuradio is a spectrum
screenshot by Chuck Swiger.

I know you can connect DReam and Gnuradio, but has anybody tried to
extract the DRM algorithms out of Dream and put it into gnuradio.

Greetings,
Martin
Matt E. (Guest)
on 2007-06-04 20:14
(Received via mailing list)
Martin D. wrote:
> Hi all,
> Is anybody working on DAB, RDS,DRM, HDradio or OFDM at the moment.

Actually, Tom, Eric, George, Thibaud, Bob, and myself are all at
Virginia Tech this week, and we're working on OFDM.  We just checked in
some working OFDM code in the trunk.  You can play with
benchmark_ofdm.py in gnuradio-examples/python/ofdm

Work continues of course, but there is plenty there to play with.

Matt
Martin D. (Guest)
on 2007-06-04 21:24
(Received via mailing list)
Matt E. wrote:
>
> Work continues of course, but there is plenty there to play with.
Thanks,
I will have a look at it.

greetings,
Martin
Eric A. Cottrell (Guest)
on 2007-06-06 02:21
(Received via mailing list)
Martin D. wrote:
> Hi all,
> Is anybody working on DAB, RDS,DRM, HDradio or OFDM at the moment.
> I will probably be working on all of these in the near future and was wondering what the 
status is of these and where to find what.
Hello,

I have some interest in IBOC.  iBiquity has some information on the
waveforms used.  Maybe a person like Bob can figure out the parameters.
http://www.ibiquity.com/i/pdfs/Waveforms_AM.pdf
http://www.ibiquity.com/i/pdfs/Waveforms_FM.pdf

The AM waveform seems a lot simpler to tackle.  The real fun will be
figuring out the data formats.  I assume that an IBOC receiver first
locks on the IDS data stream, or maybe a Reference since it is BPSK
modulated.  I have seen weak signals where a IBOC receiver can get the
call but can not go into full IBOC mode.  This makes me suspect that you
could receive the callsign without using OFDM.  After it gets the
service mode it then configures the receiver for OFDM.

I was thinking of doing a receiver that phase-locks to the AM carrier so
I can look at the I/Q output of a IBOC signal.  You can also use it as
the basis for a AM Stereo radio receiver.

73 Eric
Eric A. Cottrell (Guest)
on 2007-06-10 04:48
(Received via mailing list)
Matt E. wrote:
>
> Matt
Hello,

I was following the commit activity as I am learning SVN.  I do not want
to be drummed out of GNURadio for destroying a repository :).

I spent the week down in Chattanooga on a business trip.  Last time I
drove from Boston so I went near VT on I-81.  This time I went by train
so I was over near Danville/Lynchburg area.  I usually take some
vacation along with my trips but this one was a vacation just on the
train.  I did not do as much radio listening or USRP work on this trip
as I planned.

Since the train goes near Newark Airport I was trying to capture some
TIS-B frames.  One advantage of a train over a airplane is I can sit
there in Business Class with my laptop, a USRP box, and a 1090 MHz
Ground Plane without being bothered.  I did not log any TIS-B. :(

After I get the Mode Select stuff checked in, I want to look at the OFDM
code and see if I can figure out some AM IBOC.

73 Eric
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