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WIRELESS TRANSMISSION MEDIUMS
A typical radio communication system is composed of a transmitter and a receiver, which use antennas to convert electric signals into electromagnetic waves and vice versa. Those electromagnetic waves are propagated over the air.
In case the communication system is digital, a modem needs to be added at each end of the link. The modem is responsible for modulating and demodulating the bits using a certain modulation scheme (e.g., amplitude shift keying, frequency shift keying, phase shift keying, quadrature amplitude modulation). In addition, the modem is normally responsible for the implementation of error correction techniques and bit and frame synchronization. The output of the modem in the transmission chain ...
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