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Basic Concepts - 复旦大学精品课程.ppt

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Basic Concepts - 复旦大学精品课程.ppt

Chapter 5 Updated January 2009 Panko’sBusiness Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-HallMay only be used by adopters of the book;Orientation;Figure 5-1: Local Wireless Technologies, Continued;Figure 5-2: Wireless LAN (WLAN) Access Point;Figure 5-3: Access Router with Wireless Access Point and Wireless NICs;Figure 5-1: Local Wireless Technologies, Continued;Test Your understanding;Radio Propagation;Figure 5-5: Frequency Measurement;Figure 5-5: Frequency Measurement, Continued;Figure 5-6: Omnidirectional and Dish Antennas;Test Your understanding;Figure 5-7: Wireless Propagation Problems;Figure 5-7: Wireless Propagation Problems;Inverse Square Law Attenuation;Frequently-Depended Propagation Problem;Test Your understanding;;Figure 5-8: The Frequency Spectrum, Service Bands, and Channels;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Figure 5-9: Channel Bandwidth and Transmission Speed (Study Figure) ;Test Your understanding;Spread Spectrum Transmission;Figure 5-11: Spread Spectrum Transmission (Study Figure) ;Test Your understanding;Figure 5-11: Spread Spectrum Transmission, Continued;Figure 5-11: Spread Spectrum Transmission, Continued;Figure 5-13: Spread Spectrum Transmission Methods;Figure 5-13: Spread Spectrum Transmission Methods;Figure 5-13: Spread Spectrum Transmission Methods;Figure 5-20: Multiple Input/Multiple Output (MIMO) Transmission;;802.11 WLAN Operation;Figure 5-14: Typical 802.11 WLAN Operation ;Figure 5-14: Typical 802.11 WLAN Operation, Continued ;Figure 5-15: Stations and Access Points Transmit in a Single Channel;Test Your understanding;Media Access