One of the challenging issues is the large Doppler spread, which is caused by the high mobility of a wireless terminal and may lead to severe communication per- formance loss. Doppler spread is a measure of spectral broadening of the rate of change in a mobile fading channel which is proportional to the mobile speed.
Moreover, how does a Doppler shift work?
Besides sound and radio waves, the Doppler effect also affects the light emitted by other bodies in space. If a body in space is "blue shifted," its light waves are compacted and it is coming towards us. If it is "red shifted" the light waves are spread apart, and it is traveling away from us.
Is the Doppler shift real?
The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.
What is the Doppler effect red and blue shift?
A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift. In visible light, this shifts the color from the red end of the spectrum to the blue end.