Which type of modulation is used for the following: a) Geostationary satellite broadcasting weather-related data. b) UHF in-car CB radio for 4wd drivers. c) Mobile internet services.
Which type of modulation is used for the following:
a) Geostationary satellite broadcasting weather-related data.
b) UHF in-car CB radio for 4wd drivers.
c) Mobile internet services.
a)
Geostationary satellite broadcasting weather-related data:
In this case, a special type of modulation is used which is known as frequency modulation (FM). In this type of modulation, the frequency of a sinusoidal carrier is varied in accordance with the amplitude of the information signal.
Frequency modulation is used because it is somewhat immune to noise interference compared to the other analog modulation schemes and since the amplitude of the modulated signal remains constant, it is easier to design the receiver.
b)
UHF in-car CB radio for 4wd drivers:
In this case, a special type of modulation is used which is known as amplitude modulation (AM). In this type of modulation, the amplitude of a sinusoidal carrier is varied in accordance with the amplitude of the information signal.
It is to be noted that the receiver design in the case of amplitude modulation is easier compared to the other modulation schemes.
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