[Discuss-gnuradio] Using OFDM

[Jérémy Skelton]

Hi,

I was trying to use OFDM from gnuradio. I made my own .xml to handle  
it in GRC and it is designed to make a call like this :
        self.blks2_ofdm_mod_0 = blks2.ofdm_mod(
		options=my_utils.make_ofdm_options(mod="qpsk", fft=512, cp=128,  
tones=200, verbose=True, log=False),
                msgq_limit=2,
                pad_for_usrp=True
        )
where make_ofdm_options() builds a namedtuple object containing the  
parameters.

I only obtain this error and I really don't know what I made wrong.

OFDM Modulator:
Modulation Type: qpsk
FFT length:      512
Occupied Tones:  200
CP length:       128
>>> gr_fir_ccf: using SSE
>>> gr_fir_ccc: using SSE
Traceback (most recent call last):
  File "./ofdm_full.py", line 120, in <module>
    tb = ofdm_full()
  File "./ofdm_full.py", line 84, in __init__
    self.connect((self.gr_file_source_0, 0), (self.blks2_ofdm_mod_0,  
0))
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/ 
top_block.py", line 99, in connect
    self._connect(points[i-1], points[i])
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/ 
top_block.py", line 105, in _connect
    dst_block.basic_block(), dst_port)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/ 
gnuradio_swig_py_runtime.py", line 1469, in connect
    return _gnuradio_swig_py_runtime.gr_top_block_sptr_connect(*args)
ValueError: port number 0 exceeds max of (none)


Any idea ?

Jérémy