Wireless Technology Presentation

8/8/2019 Wireless Technology Presentation

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Presentation on

WIRELESS

TECHNOLOGY

By:

Ankit Agrawal


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Introduction


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Introduction

The term Wireless.

Wireless & Cordless Are they same?

Wireless Networks


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The Beginning

Most important discovery in Wireless history

made in 1888 by Rudolf Hertz.

First radio factory called Wireless Telegraphand Signal Companyset up by G. Marconi

in 1896.

The first commercially available radio

telephone network made available by Bell

Telephone Company in early 1950s.


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Types Of Radiations

Radiowaves Wireless transmission of signals, by modulation.

It uses two methods:a)AM(.3 3 MHz) b)FM (3-30 MHz)

Microwaves

Easily passes through the earth's. Less Interference.

More bandwidth than Radio transmission.

Used in Bluetooth


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Types Of Radiations

Infrared

Do not penetrate walls.

Is used in Remote controls.

It is used in Night-Mode

photography.


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Cellular Networks

A cellular networkis a radio network made up of a number

ofradio cells.

Cellular networks offer a number of advantages over

alternative solutions: increased capacity

reduced power usage

better coverage

Primary Feature FDMA

CDMA


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Cellular Telephony

0G

Generally old private mobilenetworks

PushTo Talk

1G

Using Analog Signal

Listen to Handset Frequency typically 150MHz and above


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Cellular Telephony

2G

Uses Digital Signal

Not only voice but now data also likeSMS,GPRS,E- mail, EGPRS

Increased capacity Emitted radio power decreased

Allowed digital error checking

Steep Dropout

Do not support cloned handset


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Cellular Telephony

3G

simultaneously both voice data and non-voice data

capacity to support greater numbers of

voice and data customers Lack of coverage because it is still new

service

Expense of 3G phones

High prices of 3G mobile services in somecountries, including Internet access


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Cellular Telephony

4G

No set definition to what 4G is

Wireless World ResearchForum (WWRF)defines 4G as a network that operates onInternet technology i.e. fully IP based

Smoothhandover across heterogeneousnetwork

Interoperable with the existing wirelessstandards

High quality of service for next generation

multimedia support


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Short Range P-to -P

Wireless Microphones

Handheld

Large enoughHeavy

Body pack

Separate housing

Wired Microphone


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Wireless Microphone

Advantages

Freedom OfMovement

Avoids Cabling Problem

Limitations

Limited Range

Limited Time period

Interference With Nearby Radio Equipment

Cost


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Remote Control

First wired Remote-control was Developed by Zenith

Radio Corporation in early 1950s

Flashmatic- wireless remote control in 1955

Remote Control as seen

by digital camera.


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Wireless LAN

Ad-hoc network uses no access point


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Wireless LAN

Advantages

Convenience and mobility

Less complex and Low Cost

Expandable

Limitations

Security Range

Speed(1-54 Mbps)


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Wi-Fi

Uses A Wi-Fi enabled device such as a computer or cell phone can connect to

the Internet when in proximity of an access point.

Wi-Fi also allows connectivity in peer-to-peer (wireless ad-hoc network)

mode, which enables devices to connect directly with each other.

More standards are in development that will allow Wi-Fi to be used by

cars inh

igh

ways in support of an IntelligentTransportation System toincrease safety, gather statistics, and enable mobile commerce.


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Wi-Fi

How ItWorks?In fact, communication across a wireless network

is a lot like two-way radio communication.

Here's what happens: A computer's wireless adapter translates data

into a radio signal and transmits it using an

antenna.

A wireless router receives the signal and decodes it.

It sends th

e information to th

e Internet using a ph

ysical,wired Ethernet connection.

This process also works in reverse.


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Wi-Fi

Advantages ofWi-Fi Allows LANs to be deployed without cabling, typically reducing the costs of

network deployment and expansion.

Wi-Fi chipset pricing continues to come down.

Wi-Fi products are widely available in the market.

Wi-Fi is a global set of standards. Unlike cellular carriers, the same Wi-Fi

client works in different countries around the world.

As of 2006, WPA and WPA2 encryption are not easily crackable if strong

passwords are used. New protocols for Quality of Service (WMM) and power saving

mechanisms (WMM Power Save) makes Wi-Fi even more suitable for

applications relating to audio and video.


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Wi-Fi

Limitations ofWi-Fi

Power consumption is fairly high.

Many 2.4 GHz 802.11b and 802.11g access points default to the same

channel, contributing to congestion on certain channels. Wi-Fi pollution, meaning interference of a closed or encrypted access

point with other open access points in the area.

A typical Wi-Fi home router using 802.11b or 802.11g with a stock antenna

might have a range of 45 m indoors and 90 m outdoors.

Wi-Fi networks can be monitored and used to read and copy data

(including personal information) transmitted over the network.

The speed and reliability of the wired connection might be worth the

hassle of running the wire, versus the cost of buying a wireless adapter.


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Wi-Fi

Standard Devices

Wireless Adapter

A wireless adapter allows a device to connect to a wireless network.

Wireless Access Point (WAP)

A wireless access point connects a group of wireless devices to an

adjacent wired LAN. An access point is similar to an Ethernet hub, relaying

data between connected wireless devices in addition to a (usually) single

connected wired device.


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Wi-Fi

Standard Devices

Wireless Ethernet Bridge

A wireless Ethernet bridge connects a wired network to a wireless

network. This is different from an access point in the sense that an access

point connects wireless devices to a wired network at the data-link layer.

Range ExtenderA wireless range extender or wireless repeater can extend the range

of an existing wireless network.


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Personal Area Network

Definition: computer network used for

communication

Bluetooth: industrial specification for

wireless personal area networks

Bluetooth PAN: piconet


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Personal Area Network

Bluetooth vs. Wi-Fi in networking

Bluetooth 2.0

Three times faster transmission speed.

Lower power consumption.

Simplification of multi-link scenarios due to more available

bandwidth.

Future of Bluetooth Automatic encryption change

Extended inquiry response

Sniff subrating

Simple pairing


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Personal Area NetworkCommunication and connection : A master

Bluetooth device can communicate with up to seven

devices.

Setting up connectionsPairing : Pairs of devices may establish a trusted

relationship by learning a shared secret

Healt

hconcern: cause irreversible damage to

human tissue.

Origin of the name : Harald Bluetooth King ofDenmark and Norway


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WiMAX

Worldwide Interoperability for Microwave

Access

Uses

Connecting Wi-Fi hotspots

Providing a wireless alternative

Providing high-speed

Providing a diverse source of Internet connectivity

Broadband Access


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WiMAX

Limitation : Decreases with distance

Mobile applications


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WiMAX

Advantages over WiFi :

Has less interference and broader range.

Better upload speed than Wi-Fi.

No need for direct line of sight.

It is the last mile solution for ISPs

Covers a big area while Wi-Fi is mainly suitable for

home or office network.


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The Future

DSL or Cable

High DefinitionDisplay

Standard

Definition

Display

Gateway /Router

MultimediaServer

VoWLANHandset /

PDA

Computer

Printer

Ethernet; Cat5 Cable and/or Home Plug

GameConsole

Desktop PC or MACHD/SD Tuners,

DVD, DVR, Etc. 11g+11e2.4 GHz

Video/AudioSource

Computer

Internet

Source: Bermai

11a+11e5 GHz


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Qs & As

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Wireless Technology Presentation

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