Recently I was learning the working principle of "constellation modulator". I
read the file "generic_mod_demod.py" and realized that it is a hierarchical
block. I was confused about its working principle, why there is no other action
after it is connected to rrc_filter. What? Shouldn't the general IQ modulation
have "acoswt-bsinwt" or "(a + bi) exp(-jwt)" operation? I haven't seen similar
operations in the code, but the output of the "constellation modulator" is a
baseband complex modulated signal. Is there anything else I can't see?
mod code:
# Connect
self._blocks = [self, self.bytes2chunks]
if self.pre_diff_code:
self._blocks.append(self.symbol_mapper)
if differential:
self._blocks.append(self.diffenc)
self._blocks += [self.chunks2symbols,
self.rrc_filter, self]
self.connect(*self._blocks)
