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

From: Robert McGwier
Subject: Re: [Discuss-gnuradio] OFDM in n4hy's tree
Date: Fri, 26 Jan 2007 23:14:09 -0500
User-agent: Thunderbird (Windows/20061207)

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.


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
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:

    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


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.


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