This document discusses wireless technology and wireless communications. It describes how wireless communications can transfer information over short or long distances using electromagnetic waves or radio frequency instead of wires. It provides examples of different types of wireless technologies like Wi-Fi, cellular networks, Bluetooth, and discusses how wireless networks can be used without wires to connect devices over distances or in situations where cabling is not practical. The document also briefly introduces wireless energy transfer as a way to charge devices without wired chargers.

1. WWW: World Without Wires
Manasvee Saraf
SakshiShetty
ShreyaPatrawala
SnehaShastri

2. Wireless World!
The term "wireless" has
become a generic and all encompassing
word used to describe communications
in which ectromagneticwaves or
Radio Frequency (rather than
some form of wire) carries a
signal over part or the entire
communication path.

3. Wireless
Communications
o Wireless communication
may be used to transfer
information over:
• short distances (a few meters as in
television remote control)
• or long distances (thousands or
millions of kilometers for radio
communications).
o It includes various types of
• fixed,
• mobile,
• and portable
two-way radios, cellular
telephones, personal digital
assistants (PDAs), and
wireless networking.

4. Wireless Technology
o Other examples of wireless
technologyinclude
• GPS units,
• garage door openers,
• wireless computer mice,
keyboards and headsets,
• satellite television and
• cordless telephones.

5. How is the information transferred?
 Wireless operations permits services, such as long range
communications, that are impossible or impractical to implement with
the use of wires.
 Telecommunications systems:
• radio transmitters and
receivers,
• remote controls,
• computer networks,
• network terminals, etc.
 They use some form of energy
• Radio frequency (RF),
• Infrared light,
• Microwave communication,
• Laser light,
• Visible light,
• Acoustic energy, etc.
to transfer information without the
use of wires.

6. Microwave
communication =>
Infrared
communication =>Radio Frequency
communication =>

7. Types of Wireless Communications:
• point-to-point communication:
from one location to the other
• point-to-multipoint
communication: from a single
location to multiple locations
• Broadcasting: from one location
to all locations simultaneously
• cellular networks: this networks
allows the user to wander about
any where in the country and
stay connected
• other wireless networks.
Broadcasting Antenna

8. The use of a wireless network:
• To span a distance beyond the capabilities of typical cabling,
• To provide a backup communications link in case of normal
network failure,
• To link portable or temporary workstations,
• To overcome situations where normal cabling is difficult or
financially impractical,
• to remotely connect mobile users or networks.
• to connect laptop users who travel from location to location.
• for mobile networks that connect via satellite.
• to network a LAN segment that must frequently change locations
• Wireless technology may supplement or replace hard wired
implementations in security systems for homes or office
buildings.

9. • Wi-Fi is a wireless local area network that enables
portable computing devices to connect easily to the
Internet.
• Cell phones use radio waves to enable the operator
to make phone calls from many locations
worldwide

10. Wireless Local Area
Network
Wireless LAN
A wireless local area
network (WLAN)
links two or more
devices using some
wireless distribution
method, and usually
providing a connection
through an access point
to the wider internet.
This gives users the
mobility to move
around within a local
coverage area and still
be connected to the
network.

11. Bluetooth
Bluetoothis a
proprietary open
wireless technology
standard for exchanging
data over short
distances (using short
wavelength radio
transmissions) from
fixed and mobile
devices, creating
personal area networks
(PANs) with high levels
of security.

12. What can we use instead of our device
chargers?
Wireless energy
transfer
Wireless energy transfer
is a process whereby
electrical energy is
transmitted from a
power source to an
electrical load that does
not have a built-in
power source, without
the use of
interconnecting wires.