资料介绍
wirelessC H A P T E R
20
Chapter Goals
Identify different types of wireless technologies. Identify different wireless solutions. Introduce quadrature amplitude modulation. Explain wireless systems. Discuss the benefits of using wireless technologies for communications.
Wireless Technologies
Types of Wireless Technology
Eighteen major types of wireless technologies exist, containing a large number of subset technologies that range from ATM-protocol based (which sells at approximately $200,000 per data link, to wireless local-area network (WLAN, which sells at less than $500,000 per data link). Frequencies of the different technologies travel between several hundred feet (wireless LAN) and 25 miles (MMDS). The process by which radio waves are propagated through the air, the amount of data c
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