Chapter 2
Contemporary Wireless Technologies
Wireless Technologies
Today, there are many wireless technologies that are used for a variety of applications. Wireless radio communications are based on transmission of radio waves through the air. Radio waves between 30 MHz and 20 GHz are used for data communications. The range lower than 30 MHz could support data communication; however, it is typically used for frequency modulation (FM) and amplitude modulation (AM) radio broadcasting because these waves reflect on the Earth’s ionosphere to extend the communication. Radio waves over 20 GHz may be absorbed by water vapor and, therefore, they are not suitable for long-distance communication.
Microwave transmission is based on the same principles ...
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