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Wireless Communication
Technologies
(WIFI ,Bluetooth , NFC )
(Master’s Seminar)
prepared by
LAYTH JASIM
Master's student at the Erciyes University
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Outline
Introduction1
What is WIFI? (Advantages & Disadvantages)4
What is Bluetooth ? (Characteristics Advantages & Disadvantages)2
What is NFC? (Advantages & Disadvantages) 3
Conclusion 5
Questions6
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Introduction
wireless communication is impotent to our life and most new technology
need it . In brief transmission of information over a distance without
requiring wires or any other electrical conductors. Wireless
communication is one of the important mediums of transmission of data
or information to other devices through the air, without requiring any
cables, by using electromagnetic waves like radio frequencies, infrared,
satellite, etc.
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Bluetooth is a short range and low power wireless technology
originally developed for exchanging data over short distances
from fixed and mobile devices, creating personal area network.
What is Bluetooth-
IEEE 802.15.1 ?
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Characteristics of Bluetooth
Bluetooth stands for Short-range transmission of digital
voice and data.
Frequency Range: ISM (Industrial, Scientific and Medical
Radio Bands) 2.4 – 2.48 GHz
Bluetooth used a Radio Technology called Frequency
Hopping Spread Spectrum.
Found in mobile phones, laptops, computer peripherals,
printers, etc
Range of Connection : 10 m – 100 m.
Supports data rate of : 1Mb/s.
There are three classes of Bluetooth devices.
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Advantages
Bluetooth
Low power consumes
battery less
Easy to use
Bluetooth
technology is inexpensiveStationary and mobile
environments
Accessible from
anywhere
Share voice and data
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www.themegallery.com
Disadvantage
Bluetooth
Low security.
Short range.
Interference with
other devices.
Low data rate.
Bluetooth internet connection
gets slow sometimes
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Near Field
Communication
(NFC)
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What is NFC?
The NFC (Near field communication) is a data transfer
technique and is the type of the wireless communication with
short range. The data is transferred in the form of beam by
touching the two things together. A single wave or beam helps to
transfer the data between two devices within the range of
4centimeter and Based on RFID technology at 13.56 MHz .
Possible transfer rates are 106, 212, 424 kbps.
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Operation Of NFC
Passive CommunicationMode : The Initiator deviceprovides a carrier field andthe target device answers bymodulating existing field. Inthis mode , the Target devicemay draw its operatingpower from the Initiator-provided electromagneticfield.
Active CommunicationMode: Both Initiator andTarget device communicateby alternately generatingtheir own field. A devicedeactivated its RF fieldwhile it is waiting for data.In this mode, both devicestypically need to have apower supply.
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Operation Of NFC
NFC devices communicate via magnetic field induction, where two loop
antennas are located within each other's near field, effectively forming an
air-core transformer.
The reader continuously generates an RF carrier sine wave (at 13.56
MHz), watching always for modulation to occur. Detected modulation of
the field would indicate the presence of a tag.
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Pros & Cons
Pros
Convenience
Low cost
Low energy consumption
Better security
No search & pair procedure
Less configuration
Cons
o Low range
o Low data range
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What is Wi-Fi?
Wi-Fi or wireless fidelity, allows you to access the internet while on the
move; you can remain online while moving from one area to another in a
wireless mode.
Wi-Fi enabled computers send and receive data indoors and out
anywhere within the range of a base station.
Its just as fast as cable modem connection.
Wi-Fi is a generic term that refers to the IEEE 802.11 communications
standard for wireless local area networks(WLANs)
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What is 802.11?
A family of wireless LAN (WLAN) specifications
developed by a working group at the Institute of
Electrical and Electronic Engineers (IEEE)
Versions: 802.11a, 802.11b, 802.11g, 802.11n
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WIFI Standard..
802.11a 1999
offers speeds with a theoretically maximum rate of 54Mbps in the 5GHz band
•Pros of 802.11a - fast maximum speed; regulated frequencies prevent signal interference from other devices
•Cons of 802.11a - highest cost; shorter range signal that is more easily obstructed
802.11b July 1999
offers speeds with a theoretically maximum rate of 11Mbps at in the 2.4 GHz spectrum band
• Pros of 802.11b - lowest cost; signal range is good and not easily obstructed
• Cons of 802.11b - slowest maximum speed; home appliances may interfere on the unregulated frequency band
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WIFI Standard..
802.11g 2001 and 2003
is a new standard for data rates of up to a theoretical maximum
of 54 Mbps at 2.4 GHz.
• Pros of 802.11g - fast maximum speed; signal range is good
and not easily obstructed
• Cons of 802.11g - costs more than 802.11b; appliances may
interfere on the unregulated signal frequency
802.11n (Recently)2008
Specifications providing for up to 300 Mbps of network
bandwidth. 802.11n also offers somewhat better range over earlier
Wi-Fi standards due to its increased signal intensity
MIMO technology(Multiple Input Multiple output) MESH
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Wireless Standards Comparison Table
802.11b 802.11g 802.11a 802.11n
IEEE Ratified 1999 2001 1999 2008
2.4GHz 2.4GHz 5GHz 2.4GHz 5GHz
Non-overlapping
Channels
3 3 12 3 12
Baseline Bandwidth
Per Channel
11Mbps 54Mbps 54Mbps 65Mbps 65Mbps
Number of Spatial
Streams
1 1 1 2, 3* or 4* 2, 3* or 4*
Channel Bonding No No No No Yes
Max Bandwidth Per
Channel
11Mbps 54Mbps 54Mbps 130Mbps 270Mbps
Operating Frequency
2.4 GHz
Indoor AP(Access Point) operate 2.4GHz due good penetration power.
5 GHz
Outdoor AP(Access Point) operate on 5GHz for maximum coverage.
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Convenience
Mobility
Productivity
Deployment
Expandability
Cost
Security
Range
Reliability
Speed
Power Consumption
DisadvantagesAdvantages
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Easy to use too
A good medium of communication
Low maintenance
No wires
portable
Conclusion
Conclusion
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Questions
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