ch02 - Wireless# Guide to Wireless Communications Chapter 2...

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1 Wireless# Guide to Wireless Communications Chapter 2 Wireless Data Transmission Jorge Olenewa – jolenewa@georgebrown.ca Office: E425 ext. 6809 Wireless# Guide to Wireless Communications - Jorge Olenewa 2 of 79 Objectives • Explain how network data is represented using binary notation • List and explain the two types of wireless transmission • Illustrate the basic concepts and techniques through which data can be transmitted by radio waves
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2 Wireless# Guide to Wireless Communications - Jorge Olenewa 3 of 79 How Data is Represented • Digital data for wireless communications – Represented using the two binary digits 0 and 1 Wireless# Guide to Wireless Communications - Jorge Olenewa 4 of 79 The Decimal Number System • Decimal or Base 10 number system – There are 10 different symbols • Used to represent each digit – No additional symbols (beyond 0-9) are needed to represent any number in decimal – Example:
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3 Wireless# Guide to Wireless Communications - Jorge Olenewa 5 of 79 The Binary Number System • Binary or Base 2 number system – Computers and data transmission equipment are better suited for a base of 2 – Binary uses a base number of 2 instead of 10 • Two symbols are used to represent a digit, 0 and 1 • The digits 0 and 1 are known as bits (BInary digiTS) – Eight binary digits grouped together form a byte • American Standard Code for Information Interchange (or ASCII code) – Represents letters or symbols in a Base 2 system Wireless# Guide to Wireless Communications - Jorge Olenewa 6 of 79 The Binary Number System (continued) • Decimal digits represented in binary:
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4 Wireless# Guide to Wireless Communications - Jorge Olenewa 7 of 79 The Binary Number System (continued) Wireless# Guide to Wireless Communications - Jorge Olenewa 8 of 79 Wireless Signals • Wireless data signals travel on electromagnetic waves – Through empty space (air or vacuum) at the speed of light – At a speed of 186,000 miles per second (300,000 kilometers per second) • Two basic types of waves used for data transmission – Infrared light –Rad
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5 Wireless# Guide to Wireless Communications - Jorge Olenewa 9 of 79 Wireless Signals (continued) Wireless# Guide to Wireless Communications - Jorge Olenewa 10 of 79 Infrared Light • It is easy to transmit information with light – Because computers and data communication equipment use binary code – A 1 in binary code could result in a light quickly flashing on • Light spectrum – Types of light that travel from the Sun to the Earth • Infrared light – Adjacent to visible light (although invisible) – A much better medium for data transmission – Less susceptible to interference
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6 Wireless# Guide to Wireless Communications - Jorge Olenewa 11 of 79 Infrared Light (continued) Wireless# Guide to Wireless Communications - Jorge Olenewa 12 of 79 Infrared Light (continued) • Infrared wireless systems require: – Emitter that transmits a signal (LED) – Detector that receives the signal
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This note was uploaded on 09/30/2010 for the course SECURITY Cnet-225 taught by Professor Mohmmedkhan during the Spring '10 term at Amity University.

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ch02 - Wireless# Guide to Wireless Communications Chapter 2...

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