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SEMINAR ON Wi-Fi

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Presented By

Somya Kumawat

ECE 3rd year V Sem

(Electronics Department)

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Wireless Fidelity (Wi-Fi)

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INDEX Introduction

Wi-Fi technologies and its Components

Working of Wi-Fi

Topologies of Wi-Fi

Wi-Fi v/s Bluetooth

Advantages and Disadvantages

Application

Wi-Fi Security Techniques

Scope of Wi-Fi

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Wi-Fi

Welcome to world ofwireless

A radio technology that networks the devices. Refers to wireless LAN product based on IEEE 802.11

specification

Provide easy connections to internet and business

networks while travelling.

The main attraction feature of this technology is that it

can provide wireless broadband connection within a

specific geographic boundaries 4

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The Wi-Fi TechnologyThe Wi-Fi technology uses radio technologies to

transmit and receive data at high speed .

IEEE 802.11a

IEEE 802.11b

IEEE 802.11g

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IEEE 802.11b In late 1999

Operates at 2.4 GHz

4.6 Mbps (actual speed)

100-150 feet range

Most popular ,least expensive

Interference from mobile phones and bluetooth

devices which can reduce the transmission speed.

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IEEE 802.11a In 2001

Operates at 5 GHz

15-20 Mbps (actual speed)

50-75 feet range

More expensive

Not compatible with 802.11b

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IEEE 802.11g In 2003

Combine the features of both standards (a,b)

100-150 feet range

54 Mbps speed

2.4 GHz radio frequency

Compatible with b

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Components of Wi-Fi

Access point

Adapters

Wi-Fi antenna Wi-Fi bridge

External USB

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How Wi-Fi Works

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How Wi-Fi Works(continue) Basic concept is same as walkie talkie.

A Wi-Fi hotspots is created by installing an access

point to an internet connection. An access point act as base station .

When Wi-Fi enabled device encounters a hotspots the

device can then connect to that network wirelessly.

A single access point can support upto 30 users.

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Topologies of Wi-Fi

AP based topology

Peer to Peer topology

Point to Multipoint Bridge

topology12

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AP based topology Clients communicate through access point.

BSA-RF coverage provided by an AP

It connects PCs by an AP

It consists of 2 or more base stations.

It includes 10-15% overlapping to allow roaming.

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Peer to Peer topology

AP is not required Client devices within a cell can communicate directly

with each.

It is useful for setting up of a wireless network quicklyand easily

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Point to multipoint bridge

topology Use line-of-sight(LOS) Used to connect a LAN between buildings rich are miles

apart

Range varies based on the type of wireless bridge and

antenna used as well as the environmental conditions.

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Wi-Fi v/s Bluetooth

Wi-Fi uses a lot of power and has a much larger

range, whereas Bluetooth has a very small range and

uses very little power.

Wi-Fi has a considerable speed advantage overBluetooth

Wi-Fi has a maximum data rate of 54 mbps whereas

Bluetooth technology, which has a maximum data rateof 3 mbps.

Wi-Fi is the name for the 802.11 wireless LAN

whereas Bluetooth is the name for 802.15 PAN.

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Advantage Wi-Fi uses unlicensed radio spectrum

Allows LANs to be setup with cabling.

Reduce associated costs of network connection Products are extensively available in the market

Prices are considerably lower

Wi-Fi networks can support roaming. Allows mobile users to move from one access point to

another.

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Disadvantage1.Wi-Fi include interference which causes the users

device to no longer function.

2.Operational limitations are not consistent worldwide.3.Power consumption is fairly high

4.Degradation in performance.

5.Wi-Fi networks have limited range.

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Application Home

Small business

Large corporations and computers Health care centres

WISP

Travellers

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Wi-Fi Security Techniques

Wired Equivalent Privacy

Wireless Protected Access

IEEE 802.11i

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Scope of Wi-Fi

1.Provide greater and longer connection ranges with faster

transfer speeds.

2.Allows users to freely surf on the web, check and send

email

3.Not only used around internet cafes, coffee houses/shops,

and airports around the world .

4.In the futures we would also see better securities measuresin protecting data.

5.Better anti-virus and firewall protections

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THANK YOU

QUERIES

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