Hi GNURadio community, I'm looking into how the modulation and demodulation blocks work. Specifically the BPSK mod and demod blocks. Here is a list of the files I looked through and the location:
generic_mod_demod.py - */gr-digital/python modulation_utils.py - */gr-digital/python bpsk.py - */gr-digital/python digital_constellation.h - */gr-digital/include digital_constellation.cc - */gr-digital/lib digital_swig.py - */build/gr-digital/swig gr_phase_modulator_fc.h - */gnuradio-core/src/lib/general gr_phase_modulator_fc.cc - */gnuradio-core/src/lib/general digital_gmskmod_bc.h - */gr-digital/include digital_gmskmod_bc.cc - */gr-digital/lib gr_diff_encoder_bb.h - */gnuradio-core/src/lib/general for differntialBPSK gr_diff_encoder_bb.cc - */gnuradio-core/src/lib/general for differntialBPSK gr_unpack_k_bits_bb.h - */gnuradio-core/src/lib/general gr_unpack_k_bits_bb.cc - */gnuradio-core/src/lib/general Are there any other files I should look at the get an understanding what happens to the bits? In the generic_mod_demod.py file, I come across functions like digital.map_bb(mod_codes.invert_code(self._constellation.pre_diff_code())) and I find the function map_bb in the digital_swig.py file. But the only code there is return _digital_swig.map_bb(*args, **kwargs) I can't find anything on _digital_swig no matter where I look. _digital_swig was set to something at the beginning of the file, but I couldn't understand it. Can someone tell me where to look to find the source code for the _digital_swig.maps_bb() and the _digital_swig.pfb_clock_sync_ccf() functions? Also another thing I've been wondering is why is there the DIGITAL_API in some lines. For example, class DIGITAL_API digital_constellation : public boost::enable_shared_from_this<digital_constellation> What is the point of DIGITAL_API? Thanks a lot, Frederick
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