Presentation on wireless technology

The presentation gives brief information about various wireless technologies that helped human civilization a lot.

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Preseted by Dipjyoti Deka

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Introduction
History
Modes of wireless technology
Application of Wireless technology
Cellular Generations
Computer Networks

3. The term wireless communication refers to the transfer of information using
electromagnetic (EM)/Radio or acoustic waves over the atmosphere rather
than using any propagation medium that employs wires. Not requiring an
explicit network of wires and permitting communication while on the move.
Radio wave: The wireless transmission through space of electromagnetic
waves in the approximate frequency range from 10 kilohertz to 300,000
megahertz.
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4. In 1819, the Danish physicist Hans Christian Oersted noted that a compass needle would
move in the presence of an electric field, thus establishing the fundamental relationship
between electricity and magnetism.
The next big leap forward was the result of theoretical work by James Clerk Maxwell, He
published "On a Dynamical Theory of the Electromagnetic Field" in 1865, and in 1873 "A
Treatise on Electricity and Magnetism," which became what are known Maxwell's Equations.
These are a series of very difficult differential equations which describe the movement of
electromagnetic waves through space.
Building on Maxwell's work, Heinrich Hertz in 1887 invented the oscillator (an alternating-
current generator) and created radio waves.
It was Nikola Tesla who first sent information through the air.
Guglielmo Marconi, who in 1895 sent a radio telegraph transmission across the English
Channel, and in 1901 a transmission across the Atlantic.
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Satellite:
Communications satellites bounce signals from one side of Earth to the other, a bit like
giant mirrors in space. A ground-based satellite transmitter dish (red) beams a signal to the
satellite's receiving dish (yellow). The satellite boosts the signal and sends it back down to
Earth from its transmitter dish (red) to a receiving dish somewhere else on Earth (yellow).

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WiMAX(WorldwideInteroperabilityforMicrowaveAccess)
TherearewirelessbroadbandsystemsthatofferfastWebsurfingwithoutbeinggetting
connectedthroughcableorDSL(ExampleofwirelessbroadbandisWiMAX).Although
WiMAXcanpotentiallydeliverdataratesofmorethan30Megabitspersecond,yetthe
providersofferaverage0dataratesof6Mbpsandoftendeliverless,makingtheservice
significantlyslowerthanthehard-wiredbroadband.

7. WirelessNetworking
WirelessNetworkingtechnologiesconnectmultiplecomputers,systemsanddevicestogether
withoutrequiringwiresorcables:awirelesslocalareanetworkorWLANcomesunderWi-Fi.
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Wi-Fi
Wi-Fiisaformoflow-powerwirelesscommunicationusedbymanyelectronicdevicessuch
aslaptops,systems,smartphones,etc.InaWi-Fisetup,awirelessrouterservesasthe
communicationhub.Thesenetworksareextremelylimitedinrangeduetolowpowerof
transmissionsallowinguserstoconnectonlywithincloseproximitytoarouterorsignal
repeater.Wi-Finetworksneedtobesecuredwithpasswordsforsecuritypurposesinordernot
tobeaccessedbyothers

9. Bluetooth Technology:
Bluetooth technology allows user to connect a variety of different electronic devices
wirelessly to a system for the transfer and sharing of data.
Cell phones are connected to hands free earpieces, wireless keyboard, mouse and mike
to laptops with the help of Bluetooth as it transmits information from one device to other
device.
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WiMAX GPSCar alarms
Cordless phones Walkie-talkies Amateur radio and
television
Wi-Fi based on
IEEE 802.11a devices
802.11n devices
IEEE 802.11ac devices

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First
Analog, circuit-switched (AMPS, TACS)
Second
Digital, circuit-switched (GSM) 10 Kbps
Advanced second
Digital, circuit switched (HSCSD High-Speed Circuit Switched Data), Internet-enabled (WAP)
10 Kbps
2.5
Digital, packet-switched, TDMA (GPRS, EDGE) 40-400 Kbps
Third
Digital, packet-switched, Wideband CDMA (UMTS) 0.4 –2 Mbps
Fourth
Data rate 100 Mbps; achieves “telepresence”

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A computer network is two or more computers connected together using a
telecommunication system for the purpose of communicating and sharing resources
Why wireless technology is used in computer networking ?
Overcome geographic limits
Access remote data
Separate clients and server

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Internet websites
www.cisco.com
www.efxkits.us
www.wordinfo.info
www.explainthatstuff.com
Book
Wireless Networking Technology by Steve Rackley
E-Book
1.Wireless Technology byprof. Jochen Schiller
2.Internetworking Technologies Handbook