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Re: [Discuss-gnuradio] GNURadio OFDM receiver design
From: |
Jens Elsner |
Subject: |
Re: [Discuss-gnuradio] GNURadio OFDM receiver design |
Date: |
Sat, 6 May 2006 20:30:03 +0200 |
User-agent: |
Mutt/1.3.28i |
Some links, in case you didn't read them yet:
http://www.nt.tu-darmstadt.de/uet/fguet/mitarbeiter/vf/
http://www.nt.tu-darmstadt.de/uet/fguet/mitarbeiter/vf/papers/Talk_HFRadio2003.pdf
Jens
On Sat, May 06, 2006 at 08:35:27AM -0500, Brett L Trotter wrote:
> I've been working in a similar vein, but like you, I lack the GNURadio
> specific knowledge.
>
> I seek a DRM (Digital Radio Mundial) implementation and have some
> serious time pressure to come up with one.
>
> I've reduced worked on the DRM (drm.sourceforge.net) code to get it to
> compile properly without a GUI- it's not a far step from there to get it
> down into just a library we might be able to link in.
>
> It includes many/all of the components you spoke of.
>
> I haven't investigated license compatibility, but a double blind rewrite
> could escape any of that (EG someone reads the code and writes detailed
> documentation then another person writes the code based on the
> documentation only without seeing the original code).
>
> In any case, perhaps if we could answer the license question, our goals
> are one in the same and could work with Eric Blossom (who has offered
> lending some advice) to get this completed.
>
> What is your timeframe?
>
> Jens Elsner wrote:
> > Hello everybody,
> >
> > I'd like to implement the physical layer of the DAB standard in GNURadio.
> > The resulting code of should be as versatile as possible since the basic
> > basic OFDM concept is the same for a lot of standards.
> >
> > Blocks that should be reusalbe are
> >
> > - OFDM time and frequency synchronization
> > -> should be based *only* on cyclic prefix correlation
> > Performance is worse but standard independend.
> > - carrier-to-symbol mapping
> > - frequency (de)interleaver
> >
> > Apart from OFDM:
> > - matrix time (de)interleaver
> > - symbol mapping
> > - QAM decoder
> > - Differential coding
> > - (de)scrambling
> > - Viterbi decoder / convolutional encoder
> >
> > All these tasks are very common. I'd like to write a general version
> > first and then adapt these blocks through inheritance for DAB.
> >
> > Some of the functionality exists already in the ATSC implementation. But I
> > feel
> > there should be a general concept about how to integrate these blocks
> > into GNURadio.
> >
> > So far I'm not familiar with the details of GNURadio. Is someone working
> > in this direction? What could be adapted from other free software
> > projects?
> >
> > Jens
> >
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
>
>
>
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