On Mon, May 23, 2011 at 10:37 PM, Ben Reynwar <b...@reynwar.net> wrote:
> On Mon, May 23, 2011 at 12:09 PM, Josh Blum <j...@joshknows.com> wrote: > > > > > > On 05/23/2011 03:29 AM, Vlad Stoianovici wrote: > >> > >> Dear Marcus and Bob, > >> I did understand that the block was hollow, but this thread is kindda > old, > >> so I thought that in the mean time maybe someone implemented the code > and > >> functionality you are referring to. > >> I'm using GRC, but I don't have time to start learning python with the > sole > >> purpose of being able to write the QAM block. > >> It would probably be easier to use Simulink, which I'd rather not do. > >> > > > > This is a motivating example for a new gr-digital component that can > > make use of tags: the QAM deframer block. :-) > > > > -josh > > In the psk8 branch of my github repo > (www.github.com/benreynwar/gnuradio/) there is QAM modulation and > demodulation within the "digital" category of GRC. I haven't tested > it recently though. Let me know if you try it and it doesn't work. > > Cheers, > Ben Ben's branch is based off of my 8psk branch in github, too. I still need to pull in his changes. I have a feeling we might be going back and forth a bit in the development of the gr-digital top-level directory. This will make it into the upcoming 'next' branch for the 3.5 release. Currently, it includes a more robust version of the Costas loop (you specify the natural freq and damping factor instead of the gains; it sets the gains properly so that the system is more tolerant and locks better) as well as a reworking of the CMA equalizer. I have yet to use this equalizer on a real signal, only simulated multipath channels, so more experience would be good. Note that if you are using this branch you should --disable-gr-trellis. I banged up the API that is used in gr-trellis and haven't got back to fix it, yet. Tom
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
