无线通信原理应用-概述.ppt

Introduction Chapter 1 Wireless Comes of Age Guglielmo Marconi invented the wireless telegraph in 1896 Communication by encoding alphanumeric characters in analog signal Sent telegraphic signals across the Atlantic Ocean Communications satellites launched in 1960s Advances in wireless technology Radio, television, mobile telephone, communication satellites More recently Satellite communications, wireless networking, cellular technology Broadband Wireless Technology Higher data rates obtainable with broadband wireless technology Graphics, video, audio Shares same advantages of all wireless services: convenience and reduced cost Service can be deployed faster than fixed service No cost of cable plant Service is mobile, deployed almost anywhere Limitations and Difficulties of Wireless Technologies Wireless is convenient and less expensive Limitations and political and technical difficulties inhibit wireless technologies Lack of an industry-wide standard Device limitations E.g., small LCD on a mobile telephone can only displaying a few lines of text E.g., browsers of most mobile wireless devices use wireless markup language (WML) instead of HTML Part One: Background Provides preview and context for rest of book Covers basic topics Data Communications TCP/IP Chapter 2: Transmission Fundamentals Basic overview of transmission topics Data communications concepts Includes techniques of analog and digital data transmission Channel capacity Transmission media Multiplexing Chapter 3: Communication Networks Comparison of basic communication network technologies Circuit switching Packet switching Frame relay ATM Chapter 4: Protocols and the TCP/IP Protocol Suite Protocol architecture Overview of TCP/IP Open systems interconnection (OSI) reference model Internetworking Part Two: Wireless Communication Technology Underlying technology of wireless transmission Encoding of analog and digital data for wireless transmission Chapter 5: Antennas and Propagation Principles of radio and