Hello, If been for a while trying to find information about how Doppler effect affects modulated signals. When a transmitter is moving relative to a receiver, the receiver will have a shift in the carrier frequency that will vary as the transmitter gets closer or moves away from the transmitter. This variation can be calculated so the receiver knows the exact frequency in order to downconvert it to baseband. My question is: Once the signal has been downconverted into baseband, has the modulated signal also been affected by the doppler effect ? If so, is there any way to calculate how about 10kHz of doppler has affected a psk or fsk baseband signal and how to reverse the effect?