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Re: [Discuss-gnuradio] GNURadio OFDM receiver design

From: Brett L Trotter
Subject: Re: [Discuss-gnuradio] GNURadio OFDM receiver design
Date: Sat, 06 May 2006 08:35:27 -0500
User-agent: Thunderbird (Windows/20060308)

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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