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Re: [Discuss-gnuradio] QAM demodulation state

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] QAM demodulation state
Date: Tue, 2 Aug 2011 19:53:02 -0400

On Mon, Aug 1, 2011 at 9:46 AM, Daniel Bartel
<address@hidden> wrote:
> Hi.
> I would like to use the Python package "packet_utils" for packet-oriented 
> transmission in combination with a QAM modulation scheme.
> I figured out, that currently in GNU Radio no QAM demodulation is 
> implemented. However I read in this mailing list, that a few people are 
> working on it or did so in the past.
> So my question is, what is the current state of QAM demodulation blocks for 
> GNU Radio?
> Thanks and best regards,
> Daniel

I'm working on redoing our digital modulation work in GNU Radio. All
digital modulation blocks (both C++ and Python) are getting moved to
gr-digital. I'm also making more use of Ben Reynwar's work that he did
a while ago on using constellation objects that provide a nice object
representation of constellation and operations for how to handle them.
I believe that this _should_ help in using QAM signals, although the
code could probably use a lot of  optimization work to support these

You can view my progress at git://github.com/trondeau/gnuradio.git in
the branch "digital." It's a work-in-progress, so nothing is
guaranteed to work right now (like I've broken all of the digital
examples). I hope to finish this up over the next few weeks and get it
into or master branch.


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