Hi,
I’m new to gnu radio. I was trying to transmit a continuous phase fsk
signal using benchmark_tx.py.
When I call the benchmark_tx.py with a default gmsk, it works fine.
However, when I set the modulation to be cpfsk (cpm) it does not work.
Below is what I am entering and the output.
Input:
./benchmark_tx.py -m cpm -f 1.8G
Output:
Traceback (most recent call last):
File “./benchmark_tx.py”, line 134, in
main()
File “./benchmark_tx.py”, line 98, in main
tb = my_top_block(mods[options.modulation], options)
File “./benchmark_tx.py”, line 43, in init
self.txpath = transmit_path(modulator, options)
File
“/home/tamara/gnuradio-3.1.2/gnuradio-examples/python/digital/transmit_path.py”,
line 65, in init
self._setup_usrp_sink()
File
“/home/tamara/gnuradio-3.1.2/gnuradio-examples/python/digital/transmit_path.py”,
line 123, in _setup_usrp_sink
pick_tx_bitrate(self._bitrate,
self._modulator_class.bits_per_symbol(),
AttributeError: type object ‘cpm_mod’ has no attribute ‘bits_per_symbol’
I looked into the cpm.py and noticed that the function to return
‘bits_per_symbol’ was commented out. I then uncommented it but when I
call
the benchmark script it still doesn’t recognize the function. I was
thinking it may have to do with recompiling or rebuilding the cpm.py
script
because code in cpm.py that was not commented out previously is being
recognized. I am new to python and mostly have a C++ background so I
may be
using the wrong terminology. Just wondering if anyone had any ideas
into
how to make the bits_per_symbol function “seen”.
Thanks,
Tamara