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Altera_Forum
Honored Contributor
Honored ContributorFSK adding I&Q correctly in phase and amplitude
I've done an FSK decoder that already works very well but there is a request to enhance the sideband surpression. the transmitting part encodes its binary stream with fsk, where it sends out tw...
Altera_ForumHonored Contributor
Honored Contributorone more note...
we need that fsk decoder with sin cos f0 f1 multiplication, because this is also a very smal band filtering of the input signal the fsk decoder is very imune to additional noise close to f0 and f1. in fact the noise can have a higher amplitude than the transmitted fsk signal and is decoded perfercly as long as the lsb of the adc has the information the noise as big as the adc full resolution won't disturb the decoded binary stream. we "hear a pin drop" if it drops.
