QAM demodulation state

GNU Radio
1

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

2

On Mon, Aug 1, 2011 at 9:46 AM, Daniel Bartel
[email protected] 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 R.'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
signals.

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.

Tom

3

On Tue, Aug 2, 2011 at 7:53 PM, Tom R. [email protected]
wrote:

Daniel

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.

Tom

And by master branch, I meant next branch.

Tom