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Altera_Forum's avatar
Altera_Forum
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15 years ago

FSK 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_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

one 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.