Re: [Discuss-gnuradio] OFDM in n4hy's tree

[Robert McGwier]

Like all things in branches, until they are not in branches,  this is 
absolutely development code and here is no guarantee of completeness or 
even correctness.  It is the reason for doing this kind of work in 
branches rather than imposing it on everyone in the trunk.

In the gnuradio-examples/python/ofdm directory, the only functional 
up-to-date file as of this moment is ofdm_benchmark.py.   It does a 
loopback through noise test.

ofdm_benchmark_tx.py calls upon a tx_pick_bitrate  which is missing from 
the single computer where Tom, Matt, and I did the work.  I will make 
sure that this is not an accidental omission that was actually on Tom's 
laptop when he arrives tomorrow.

We are attempting a very difficult thing which requires some delicacy 
and art.  We want to be able to come up with a compact description of 
any kind of constellation,  cyclic prefix size, or complete absence of 
cyclic prefix and then have support for the requirement for sync 
channels of several types.  At the same time,  we have the design goal 
for this to be reasonably efficient and even dynamic.  We have chosen 
not to take the fast road to a single exemplar but to abstract as much 
of this as possible believing this will aid experimentation and serve 
the greatest possible good.

I have been so busy for the last few weeks that all of this slipped out 
of the sieve that is left of my mind ;-).

When Tom and I can get some work done tomorrow, one of the things we 
will be planning is the next big steps in the ofdm tree.  You may expect 
nothing to work until we say it does work.

Bob





Eric Blossom wrote:
> On Fri, Jan 26, 2007 at 07:22:58PM -0800, Eric Blossom wrote:
>   
> > On Fri, Jan 26, 2007 at 06:25:29PM -0800, Brett Trotter wrote:
> >     
> > > I took Dan Halperin's advice and totally deleted my build tree- I also
> > > totally cleaned out all traces of gnuradio and re-checked out everything
> > > from subversion and re-built (n4hy's tree) and am still missing
> > > _gnuradio_swig_python.
> > >       
> > There is no longer a _gnuradio_swig_python file.  It's not supposed to
> > be there.  I believe the problem you are seeing is related to stale
> > swig dependencies left over in the current build tree.
> >
> > See http://gnuradio.org/trac/ticket/130
> >
> > Either of these should fix the problem:
> >
> > (1)
> >     If you start with a fresh checkout -- into an *empty* directory -- I'm
> >     pretty sure that you will not see the message.  By *empty* I mean
> >     *empty*.  That is, no .deps or .libs files, or anything else for
> >     that matter.
> >
> > (2) 
> >     cd gnuradio-core/src/lib/swig
> >     for file in *.d do; cp /dev/null $file; done
> >     make
> >
> > Eric
> >     
>
> I've given you somewhat incorrect info.
>
> Bob's ofdm tree hasn't been updated with the changes that split
> gnuradio_swig_python into 5 pieces.  Thus, there should be an
> _gnuradio_swig_python file.
>
> In any event, a checkout into an empty directory worked for me.
>
> Eric
>
>
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>   


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