March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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3
CHAPTER THREE
Modulation
Radio signals can be used to carry information. The information, which may be audio, data
or other forms, is used to modify (modulate) a single frequency known as the carrier. The information
superimposed onto the carrier forms a radio signal which is transmitted to the receiver.
Here, the information is removed from the radio signal and reconstituted in its original format
in a process known as demodulation. It is worth noting at this stage that the carrier itself does
not convey any information.
There are many different varieties of modulation but they all fall into three basic categories, namely
amplitude modulation, frequency modulation and phase modulation, although frequency and
phase modulation are essentially the
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