2. 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.offices
etc)
3. 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
5. 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 networks
Bluetooth and ultra wide
band
6. 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
7. 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
8.
9.
10. Modern cellular telephone
network
built 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.
11. 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.
12.
13. 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
14.
15. 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.
16.
17.
18.
19.
20.
21.
22. 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
23. 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