Wireless communication systems-classifications

classifications

Suryaan Kaushikeyan

Venkatesh pulugurtha

by

The wireless communication systems actually an idea emerged in 1980’s and it is developed

In the view of user(application or company) to make data portable,mobile and accessible then wireless communication is the better answer

In order to avoid complete cable problems(expenses on installing lot of cables)

To save time and money

Used in public places(library,cafetaries,institutions,Govt.officesetc)

Electromagnetic radiation

Emitted by sinusoidal current running

through a wire (transmitting antenna)

Creates propagating sinusoidal magnetic

and electric fields according to Maxwell’s

equations:

Fields induce current in receiving antenna

electric

field

magnetic

field

propagation direction

The wireless communication System

(WCS)

A network protocol that enables online

content to be viewed via devices and

Electonic gadgets like

cellphones,laptops and tablets and

handhelds is called a wireless network.

The communication made possible by

this wireless network is called as wireless

communication system. Wireless

data communication technologies

includes:

Wireless local area network

satellite and cellular networksBluetooth and ultra wide

band

Wireless

describes devices and technologies,that are not connected by wire.

Wireless communications

Transmission of user data without the use of wires

Wireless data communication technologies include:

bluetooth

Wireless LAN and WAN

Satellite

cellular

Used to transmit data over very long distance

Repeater

Located in 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

Modern cellular telephone networkbuilt around the concept of

local power transmitters. with each “cell’’ handling a

number of users.

Trasmission towers are spread through out a geographical area.

The same radio channel can be used by another tower.

o Located a few miles away to avoid interference.

3G(third generation) technology

Uses 100% digital transmission for both voice and data.

Tranmission speed

Up to 2Mbps when stationary

384 Kbps for slow-moving pedestrains.

Up to 144 Kbps from a moving vehicle.

2.5G has a maximum data transmission rate of up to 384 Kbps.

BLUETOOTH:

Distance:300 feet(90 mts)

Bandwidth:54Mbps

Can also include voice over

IP(VOIP)

ULTRAWIDEBAND:

Distance:150 feet(50 mts)

Bandwidth:100 Mbps to 2

Gbps

Wireless Local Area Network(WLAN):

Extension of a wired LAN.

• Connecting to it through a device called a wireless access point.

Access point(AP):

Relays data signals between all of the devices in the network.

• Each computer on the WLAN has a wireless network interface card(NIC)

With an antenna built into it.

Wireless Applications:

Government and Military

Travel

Environmental research and education

Industrial control

Advantages:

Mobility

Easier and less expensive installation

Disaster recovery

Disadvantages:

Radio signal interference

Security

Health risks

Wireless networks and devices are

found in all circles of life today

Wireless communications have

become commonplace

Enable companies of all sizes to

interconnect their offices

WLAN applications are found in

wide variety of industries and

organizations.

Used as remote sensors