9781423901402_PPT_Ch10 - Information Technology in Theory...

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Chapter 10 Wireless Communications Information Technology in Theory By Pelin Aksoy and Laura DeNardis
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2 Objectives 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 Objectives (continued) 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
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4 Applications of Radio Frequency Ever since Guglielmo Marconi first demonstrated 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 wireless communication, such as listening to the radio or talking on a cellular phone Information Technology in Theory
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5 Applications of Radio Frequency (continued) Information Technology in Theory
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6 Digital Radio and TV Broadcasting 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 higher-quality alternative for radio listeners Information Technology in Theory
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7 Digital Radio and TV Broadcasting (continued) Such services, which use digital signals to transmit 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, other multimedia, and text Information Technology in Theory
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8 Digital Radio and TV Broadcasting (continued) Because terrestrial radio broadcasting has a limited 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- fidelity audio, and such features as pay-per-view and video on demand Information Technology in Theory
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9 Digital Radio and TV Broadcasting (continued) Many cable companies provide digital broadcast services to consumers in the form of digital cable High-definition television (HDTV) is also in demand for its superior picture and sound quality Information Technology in Theory
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10 National Defense and Emergency Services Military ships, aircraft, and terrestrial units are in constant communication via designated radio frequencies One major difference between civilian and military communications is the level of security Another critical application of radio waves is in emergency dispatch services Information Technology in Theory
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9781423901402_PPT_Ch10 - Information Technology in Theory...

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