A sinusoidal signal of the form 
s transmitted from a fixed platform. The signal is received by an antenna which is on a mobile platform that is in motion relative to the transmitter, with a velocity of relative to the direction of signal propagation between the transmitter and receiver. Therefore, the received signal experiences a Doppler shift and (ignoring noise in the receiver) is of the form
Where c is the speed of light. Find the PSD of the received signal if v is uniformly distributed over 
Qualitatively, what does the Doppler effect do to the PSD of the sinusoidal signal