802.11a,b,g, and n Remote.


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There have been 5 noteworthy breakthroughs in remote web correspondence. 802.11 Released in 1997, the first remote convention. 802.11a Released in late 1999 ...
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802.11a,b,g, and n Wireless By Winway Pang

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History There have been 5 noteworthy points of reference in remote web correspondence. 802.11 – Released in 1997, the first remote convention 802.11a – Released in late 1999 802.11b – Released in late 1999 802.11g – Released in mid 2003 802.11n – Released in 2009

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802.11-1997 The ORIGINAL remote convention. Security executed by means of WEP Wired Equivalent Privacy (Legacy) Provided Bandwidth 1 or 2 Mbit/s because of utilization of CSMA/CA Relatively Unpopular Low interoperability because of free details Used DSSS Considered Legacy and didn\'t really utilized

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802.11a One of two alterations to the first 802.11 determination discharged all the while Provided up to 54 Mbit/s transmission capacity Uses OFDM Orthogonal Frequency-Division Multiplexing Transmits a sign more than a few sub signals for higher effectiveness

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OFDM

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802.11b Second of two revisions discharged in 1999 Provided up to 11 Mbit/s data transfer capacity Uses DSSS Direct-Sequence Spread Spectrum Transmits a sign more than a few sub signals for higher productivity

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DSSS

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802.11a and b Both presented in the meantime Both use CSMA/CA 802.11a Faster More costly to make Operated in 5Ghz band Mainly utilized as a part of modern settings 802.11b Slower Cheaper to fabricate Operated in 2.4Ghz band. Chiefly utilized as a part of private settings

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802.11g Pretty much the most widely recognized remote system being used today. Works on 2.4Ghz band Provides up 54Mbit/s transfer speed 108Mbit/s with extraordinary usage Uses OFDM for adjustment Adopted rapidly after discharge for modest and high data transmission

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802.11n Newest individual from the 802.11 family. Has appraised 600Mbit/s transmission capacity Introduces MIMO Multiple-Input Multiple-Output OFDM Modulation Uses higher frequencies for expanded number of bearer waves

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802.11n – New Technologies Beam Forming Takes point of interest of multi-recieving wire setup Makes signals from partitioned reception apparatus land in a state of harmony Out of sync prompts impedance In a state of harmony prompts more noteworthy sign quality

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802.11n – New Technologies Multipath/Spatial Diversity Multiple recieving wire/radios send/get signals Different signs achieve recipients at various times Use math to join signals for more prominent quality Each stream can convey separate information

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802.11n – New Technologies Guard interim diminishment Guard interim is a period of radio quiet Used to stay away from obstruction 802.11n can decrease monitor interim from 800us to 400us.

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802.11n – New Technologies Frame accumulation Aggregate various edges bound for a particular AP and send them together to lessen overhead

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References http://en.wikipedia.org/wiki/IEEE_802.11 http://www.cisco.com/en/US/push/insurance/remote/ps5678/ps6973/ps8382/prod_white_paper0900aecd806b8ce7_ns767_Networking_Solutions_White_Paper.html http://zone.ni.com/devzone/cda/tut/p/id/4450 http://www.proxim.com/learn/library/whitepapers/maximizing_80211g_investment.pdf http://www.proxim.com/learn/library/whitepapers/80211a.pdf http://computer.howstuffworks.com/remote network1.htm http://compnetworking.about.com/cs/wireless80211/an/aa80211standard.htm http://mobilewireless.wordpress.com/2008/03/01/a review of-ofdm/

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