[Discuss-gnuradio] gnuradio-coded-ofdm trellis problem

[souvik.sen]

Hi,

I am trying to run coded_ofdm_loopback.py in gnuradio-coded-ofdm. After two
iterations of packet transmit and receive, the code is facing an assertion
failure at:

python: gr_coded_ofdm_demod.cc:807: virtual int
gr_coded_ofdm_demod::general_work(int, gr_vector_int&,
gr_vector_const_void_star&, gr_vector_void_star&): Assertion `0' failed.

It seems that the queue between gr_coded_ofdm_demod and
gr_coded_ofdm_frame_sink is overflowing. The data is written from
gr_coded_ofdm_demod and is not read from gr_coded_ofdm_frame_sink. It seems
that gr_coded_ofdm_frame_sink block is not being fired ever.

There are certain trellis blocks in between gr_coded_ofdm_demod and
gr_coded_ofdm_frame_sink. I suspect that the problem is with trellis. I ran
make check and it gave me a trellis error:

 File
"/home/souvik/GnuRadio/gnuradio-coded-ofdm/gnuradio-core/src/python/gnuradio/blks2impl/coded_ofdm.py",
line 26, in <module>
    from gnuradio import trellis
ImportError: cannot import name trellis
Segmentation fault

I am running ubuntu 8.04 with gcc version 4.2. I am not sure why trellis is
not being compiled properly. I tried the gnuradio trunk, but in that case
trellis does not give any error. Please help. Any comment will be highly
appreciated.

Thanks,

Souvik

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