# COMPUTER FUNDAMENTALS

## COMPUTER NETWORKS AND COMMUNICATIONS

### WIRELESS COMMUNICATION TECHNOLOGIES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Doppler shift is directly proportional to ____
 A Velocity of the mobile device B Height of antenna C Power of receiving antenna D Power of transmitter
Explanation:

Detailed explanation-1: -The Doppler effect is the phenomenon whereby a monochromatic wave reflected by a moving target undergoes a frequency shift which is proportional to the target velocity, namely = o(1 − v · n/c), where v is the target velocity, c is the wave velocity and n is the unit vector in the direction of the reflected ray.

Detailed explanation-2: -Explanation: The shift in received signal frequency due to motion is called Doppler shift. It is directly proportional to the velocity and direction of motion of mobile with respect to the direction of arrival of the received multipath wave.

Detailed explanation-3: -In a mobile communication system, signals which are transmitted from mobile stations moving relative to a base station are subject to the well-known Doppler effect, which causes a frequency shift in the frequency received at the base station relative to that which was transmitted by the mobile station.

Detailed explanation-4: -Communications System When wave energy like sound or radio waves travels from two objects, the wavelength can seem to be changed if one or both of them are moving. This is called the Doppler effect.

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