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 (Worldwide Interoperability for Microwave Access)
There are wireless broadband systems that offer fast Web surfing without being getting
connected through cable or DSL (Example of wireless broadband is WiMAX). Although
WiMAX can potentially deliver data rates of more than 30 Megabits per second, yet the
providers offer average 0 data rates of 6 Mbps and often deliver less, making the service
significantly slower than the hard-wired broadband.

7. Wireless Networking
Wireless Networking technologies connect multiple computers, systems and devices together
without requiring wires or cables: a wireless local area network or WLAN comes under Wi-Fi.
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Wi-Fi
Wi-Fi is a form of low-power wireless communication used by many electronic devices such
as laptops, systems, smart phones, etc. In a Wi-Fi setup, a wireless router serves as the
communication hub. These networks are extremely limited in range due to low power of
transmissions allowing users to connect only within close proximity to a router or signal
repeater. Wi-Fi networks need to be secured with passwords for security purposes in order not
to be accessed by others

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 GPS Car 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 by prof. Jochen Schiller
2.Internetworking Technologies Handbook