for a Project I need to build an Audio Modem in GNU Radio.
I decided, that it would be the best to use DBPSK Modulation, because that is fast and relatively noise resistant.
But as it seems, the DBSK Modulators are just modulating the Signal on the Baseband.
That's not what I want. Would it be enough, to just multiply the signal with a signal source? And when I do that, do I have to meet any preconditions so that the demodulator doesnt expect a Baseband?
PS: If you have any recommendations what would be a good filter, to get the best out of it, I would like to hear that to.