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Evolution of Wireless Network

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Jeremiah Htet

on 30 September 2013

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Transcript of Evolution of Wireless Network

Evolution of Wireless Network

Wi-Fi
-The Wi-Fi Alliance defines Wi-Fi as any WLAN products that are based on the IEEE 802.11 standards.
-WiFi Isn't Short for Wireless Fidelity although many thinks it is.
-Many devices can use Wi-Fi, e.g. personal computers, video-game consoles, smartphones, some digital cameras, tablet computers and digital audio players.
-These can connect to a network resource such as the Internet via a wireless network access point.
-Such an access point (or hotspot) has a range of about 20 meters indoors and a greater range outdoors.

WLAN:Brief History Lesson
-Origin traced back to late 1980s
-When we referring to WLAN we direct referring to IEEE 802.11
-Allowed for the use of an unlicensed transmission frequency band(ISM band: Industrial, Scientific, Medical Band)

WLAN:Brief History Lesson
1G:First Generation Wireless Technology
-Analog signals were being used for 1G.
-The speed of 1G networks vary between 28 kbps and 56 kbps (using a 28k modem and 56k modem).
-In 1979 , the first cellular network was launched in Japan by Nippon Telegraph and Telephone (NTT) .
-And became the first nationwide 1G network to cover the population of Japan.

3G:Third Generation Wireless Technology
-Don’t have the same radio frequency as 2G.
-3G can transfer at a rate of 200kbps.
-3G network and HSDPA (High Speed Download Package Access) were operating in the end of 2007.
-Further development were seen as 3.5G and 3.75G.


Advantages and Disadvantages
Advantages
-Convenience
-Mobility
-Productivity
-Deployment
-Expandability
-Cost

First radio waves
-The discovery of the first radio waves was in 1888 by Heinrich Herz.
-Until 1986 by Guglielmo Marconi (a.k.a. Father of Radio), wireless transmission only was discovered when he send received signals beyond the human vision.

Wireless?
-Wireless networking is a form of communication between computers using microwaves and/or radio waves.
-The backbone network usually uses cables.
-The last received of the users is wireless, to give a network connection to all users.


What is 802.11
-A family of wireless LAN(WLAN) specifications developed by a working group at the IEEE.
-Defines standard for WLANs using the following four technology
-Frequency Hopping Spread Spectrum(FHSS)
-Direct Sequence Spread Spectrum(DSSS)
-Infrared (IR)
-Orthogonal Frequency Division Multiplexing(OFDM)
Versions:
802.11a
802.11b
802.11g
802.11e
802.11f
802.11i

Physical Layer:FHSS,DSSS,Infrared,OFDM
-Origin traced back to late 1980s
-When we referring to WLAN we direct referring to IEEE 802.11
-Allowed for the use of an unlicensed transmission frequency band(ISM band: Industrial, Scientific, Medical Band)

802.11
-Most wireless LAN products operate in unlicensed radio bands
-2.4GHz is most popular
-Available in most parts of the world
-No need for user licensing
-Most wireless LANs use Spread-Spectrum radio(SS)
-Resistance to interference, secure
-Two popular methods
-Frequency Hopping
-Direct Sequence


Wireless Wide Area Network WWAN
1G:Analog signal
2G:Digital Voice
3G:Digital Voice and Data
4G:LTE and WiMAX

ALOHAnet
-In 1971, a group of researchers from University of Hawaii created the very first packed based radio communication network called ALOHAnet.
-ALOHAnet was a WLAN that consists of 7 computers in a star topology.

Motorola DynaTAC 8000X(1983)
Started the wireless communication revolution.

First wireless phone with a 4 line LCD display:Siemens S1(1992)
2G:Second Generation Wireless Technology
-Introduced in 1991 GSM (Global System for Mobile Communications) in Finland.
-The release of 2G started with SMS (Short Message System).
Digital signal were being used.
-The main 2G standards are GSM (TDMA), IS-95 (CDMA), PDC (TDMA), iDEN (TDMA), and IS-136 (TDMA).



Advantages & disdvantages compare to 1G
-Data can be compressed and multiplexed more effectively compared to analog which allows more calls to be transmitted in the same bandwidth.

-The disadvantages of 2G were that in some area, digital signal tend to be weak. Signals can drop and if conditions get worst, the system will fail.

Basic Service as 3G network
-High quality voice tramission
-Messaging
-Replace email,fax, SMS ,etc
-Multimedia
-Music,video,film,TV etc
-Upgraded:Mobile TV, Video Conferencing, GPS, etc.
-Internet access
-Web surfing


4G:Fourth Generation Wireless Technology
-New services to the world such as 3D Television, Cloud Computing, Gaming services
-Two systems were introduced for the release of 4G, WiMAX and LTE ( Long Term Evolution).
-The speed can range from 100Mbps to 1Gbps.
-Compared to earlier generations of “circuit-switched” service, 4G uses an all-IP based services.
-New devices are being developed such as IEEE 82.16 or WirelessMAN-Advanced

Disadvantages
-Security
-Reliability
-Speed

References

computernetworkingnotes.com/wireless-networking-on-sisco-router/types-of-wireless-networks.html

www.arp.sprnet.org/defauly/inserv/trends/history wireless.html

www.pbs.org/wgbh/aso/databank/entries/btmarc.html

www.pbs.org/wgbh/aso/databank/enteries/dt01ma.html

en.wikipedia.org/wiki/1G

en.wikipedia.org/wiki/2G

en.wikipedia.org/wiki/3G

en.wikipedia.org/wiki/4G

ipoint-tech.com/wireless-networking-wi-fi-advantages-and-disadvantages-to-wireless-networking/
Created by :
Jeremiah Htet Thu Htwe 4633817
Goh Chee Yong 4540232

Before 2G evolved into 3G, 2.5G (GPRS) and 2.75G (EDGE) technologies were used2.5G speed 56kbps up to 115kps.
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