Ch.10 - Wireless Communications

Ch.10 - Wireless Communications - 3/25/2010 CIS 3003...

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3/25/2010 1 CIS 3003 Information Technology Concepts CHAPTER 10 WIRELESS COMMUNICATIONS CIS 3003 Information Technology Concepts Objectives 2 ± Understand the various applications that use radio waves ± Learn about satellite components and satellite orbits ± Understand the effects of the atmosphere on radio waves Information Technology in Theory
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3/25/2010 2 CIS 3003 Information Technology Concepts Objectives (continued) 3 ± Learn about the underlying principles of the global ± Learn about the underlying principles of the global positioning system ± Gain exposure to satellite-based Internet services and radio frequency identification Information Technology in Theory CIS 3003 Information Technology Concepts Applications of Radio Frequency 4 ± Ever since Guglielmo Marconi first demonstrated how to communicate using long distance radio how to communicate using long-distance radio waves, people have used them for information exchange ± The frequency of radio waves ranges from a few hertz to hundreds of billions of hertz ± Most of our daily activities involve some form of Information Technology in Theory wireless communication, such as listening to the radio or talking on a cellular phone
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3/25/2010 3 CIS 3003 Information Technology Concepts Applications of Radio Frequency (continued) Information Technology in Theory 5 CIS 3003 Information Technology Concepts Digital Radio and TV Broadcasting 6 ± The traditional AM and FM techniques are still used extensively for radio broadcasting ± Analog radio is vulnerable to unwanted effects such as interference from other sources, which cannot be removed effectively ± Digital radio, which uses effective error-control techniques was developed as a highe quality Information Technology in Theory techniques, was developed as a higher-quality alternative for radio listeners
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3/25/2010 4 CIS 3003 Information Technology Concepts Digital Radio and TV Broadcasting (continued) 7 ± Such services, which use digital signals to transmit information are also called digital audio information, are also called digital audio broadcasting (DAB) and high-definition radio (HD radio) ± These technologies offer high-fidelity music that is close to CD quality, as well as digital broadcasting that enables receivers to display moving pictures Information Technology in Theory that enables receivers to display moving pictures, other multimedia, and text CIS 3003 Information Technology Concepts Digital Radio and TV Broadcasting (continued) 8 ± Because terrestrial radio broadcasting has a limited reach satellite radio has become an attractive reach, satellite radio has become an attractive alternative ± Satellite television providers broadcast signals via satellite to customers over a large area ± Digital television (DTV) broadcasting enables the transmission of many high quality channels high Information Technology in Theory transmission of many high-quality channels, high- fidelity audio, and such features as pay-per-view and video on demand
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Ch.10 - Wireless Communications - 3/25/2010 CIS 3003...

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