Re: [Discuss-gnuradio] GNURadio OFDM receiver design

[Jens Elsner]

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
> > 
> > 
> > 
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> > 
> 
> 
> 
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