Tom,
Thank you for the help. But, even that didn't work. I tried a different approach. I configured the "Constellation Object" block with the* symbol map *and the *constellation points*. Then, I called it in the argument of the "Constellation Decoder" block. And it worked. I am still wondering what is the right way to define a* 'digital_constellation_sptr' *type in the "Constellation Decoder" argument without passing by the "Constellation Object" block. Regards, Azza On Tue, Mar 4, 2014 at 5:16 PM, Tom Rondeau <t...@trondeau.com> wrote: > On Tue, Mar 4, 2014 at 4:17 PM, Azza Ben Mosbah > <azza.ben.mos...@gmail.com> wrote: > > Hi All, > > > > I am manipulating GNU Radio Companion. > > While using the "Constellation Decoder" block, I have put > > digital.constellation_qpsk as a "Constellation Object" argument. But, I > have > > found an error when I have executed the flow graph: > > > > Traceback (most recent call last): > > File "/users/anb10/metrics/error_rate.py", line 342, in <module> > > tb = error_rate() > > File "/users/anb10/metrics/error_rate.py", line 225, in __init__ > > self.digital_constellation_decoder_cb_0 = > > digital.constellation_decoder_cb(digital.constellation_qpsk) > > File > > "/usr/lib64/python2.6/site-packages/gnuradio/digital/digital_swig.py", > line > > 3096, in constellation_decoder_cb > > return _digital_swig.constellation_decoder_cb(*args, **kwargs) > > TypeError: in method 'constellation_decoder_cb', argument 1 of type > > 'digital_constellation_sptr' > > > > I don't know what went wrong. I have even tried > > digital.psk.psk_constellation(m=4,mod_code='gray'), > > digital.constellation_8psk and > > digital.psk.psk_constellation(m=8,mod_code='gray') as a "Constellation > > Object" argument. > > > > So, what is the proper way to define the argument (Constellation Object) > in > > the "Constellation Decoder" block? > > > > I hope you can give me some ideas. Any help is appreciated. Thank you. > > > > Regards, > > Azza > > Azza, > > Check out the documentation page: > > http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1constellation__decoder__cb.html > > It's not entirely clear (unless you know to look for it). You want to > pass the constellation object using the base() parameter to get to the > parent class. Basically, you'd call it: > > digital.constellation_decoder_cb(digital.constellation_qpsk.base()) > > Tom >
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