ch01_itc 254 - ITC254 Wireless Network Wireless# Guide to...

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ITC254 Wireless Network Wireless# Guide to Wireless Communications Chapter 1 Introduction to Wireless Communications
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2 Objectives Explain how the major wireless technologies are used today Describe various applications of wireless communications technology Explain the advantages and disadvantages of wireless communications technology List several different wireless technologies
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3 How Wireless Technology is Used Wireless Describes devices and technologies that are not connected by a wire Wireless communications Transmission of user data without the use of wires Wireless data communications technologies include: Bluetooth Wireless LAN and WAN Satellite Cellular
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4 A Wireless World Wireless devices Distance: 300 feet (90 meters) Bandwidth: 54 Mbps Can also include Voice over IP (VoIP) Wireless network interface card (Wireless NIC) Sends and receives data over radio waves Smartphone Combination mobile phone and personal digital assistant (PDA)
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5 A Wireless World (continued)
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6 Bluetooth and Ultra Wide Band Radio frequency identification device (RFID) tags Small chips containing radio transponders Can be used to track inventory Bluetooth and Ultra Wide Band (UWB) Wireless standards designed for very short ranges Communicate using small, low-power transceivers Link manager Special software that helps identify other Bluetooth devices
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7 Bluetooth and Ultra Wide Band (cont. .)
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8 Bluetooth and Ultra Wide Band (cont. .) Bluetooth Distance: up to 33 feet (10 meters) Bandwidth: 1 Mbps Ultra Wide Band Distance: 150 feet (50 meters) Bandwidth: 100 Mbps to 2 Gbps Piconet Wireless personal area network (WPAN) Consists of two or more Bluetooth devices that are exchanging data with each other
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9 Bluetooth and Ultra Wide Band (cont. .)
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10 Satellite Networks Used to transmit data over very long distance Repeater Located in the satellite itself Simply “repeats” the same signal to another location Used to transmit data from one earth station to another Transmission time is approximately 250 milliseconds
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11 Satellite Networks (continued)
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12 Satellite Networks (cont. .)
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13 Cellular Networks Modern cellular telephone network Built around the concept of low power transmitters With each “cell” handling a number of users Transmission towers are spread throughout a geographical area The same radio frequency channels can be reused by another tower Located a few miles away to avoid interference Maximises the use of a limited range of frequency channels
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14 Cellular Networks (cont. .)
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15 Cellular Networks (cont…) 3G (third generation) technology Uses 100% digital transmission for both voice and data Transmission speed Up to 2 Mbps when stationary 384 Kbps for slow-moving pedestrians Up to 144 Kbps from a moving vehicle 2.5G has a maximum data transmission rate of up to 384 Kbps
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16 Cellular Networks (cont. .)
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ch01_itc 254 - ITC254 Wireless Network Wireless# Guide to...

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