Achilleas, great. I'll then focus for now on implementing time/frequency synchronization. Does the decoder support puncturing? Did you publish you code already?
Concerning my "jitter" problem: I sampled another DAB source with the DBSRX daughterboard and implemented a correlation based frequency synchronization algorithm. That pretty much solved the problem (although a little jitter is still there). Jens On Sat, May 06, 2006 at 12:51:50PM -0400, Achilleas Anastasopoulos wrote: > Jens, > > I already have implemented generic blocks for > > - convolutional encoder / Viterbi decoder > > also, with this it is straightforward to implement > > - Differential coding > > Finally, I am currently implementing a generic > > - interleaver/deinterleaver. > > > Achilleas > > > >Message: 2 > >Date: Sat, 6 May 2006 14:30:52 +0200 > >From: Jens Elsner <[EMAIL PROTECTED]> > >Subject: [Discuss-gnuradio] GNURadio OFDM receiver design > >To: [email protected] > >Message-ID: <[EMAIL PROTECTED]> > >Content-Type: text/plain; charset=us-ascii > > > >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 > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
