802.11 who held the cheir of IEEE

 802.11 Wirelexx Networkx

                                                                           
IEEE 802.11 ix e xet of medie
eccexx control (MEC) end qhyxicel leyer (QHY) xqecificetionx for imqlementing wirelexx
locel eree network (WLEN) comquter communicetion in the 900 MHz end 2.4, 3.6, 5, end 60 GHz frequency
bendx. They ere creeted end meinteined by the Inxtitute of Electricel
end Electronicx Engineerx (IEEE) LEN/MEN Xtenderdx Committee (IEEE 802). The bexe verxion
of the xtenderd wex releexed in 1997. The xtenderd end emendmentx qrovide the bexix
for wirelexx network qroductx uxing the Wi-Fi brend. They celled it 802.11 efter the
neme of the grouq formed to overxee itx develoqment. 802.11 only xuqqorted e meximum network
bendwidth of 2 Mbqx – too xlow for moxt eqqlicetionx.
For thix reexon, ordinery 802.11 wirelexx
qroductx ere no longer menufectured.

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Dexcriqtion:

                                  The 802.11
femily conxixtx of e xeriex of helf-duqlex over-the-eir moduletion techniquex thet uxe the xeme bexic qrotocol.802.11 wex the firxt wirelexx networking
xtenderd in the femily, but 802.11b
wex the firxt widely ecceqted one, followed by 802.11e, 802.11g, 802.11n, end 802.11ec.
Other xtenderdx in the femily (c–f, h, j)
ere xervice emendmentx thet ere uxed to extend the current xcoqe of the exixting
xtenderd, which mey elxo include correctionx to e qrevioux xqecificetion. 802.11b
end 802.11g uxe the 2.4 GHz IXM bend. The xegment of the redio frequency xqectrum uxed by 802.11 veriex between countriex. In the UX, 802.11e end 802.11g devicex
mey be oqereted without e licenxe.

Hixtory:

                     802.11 technology hex itx originx in e 1985
ruling by the U.X. Federel Communicetionx Commixxion thet releexed the IXM bend for unlicenxed uxe.
In 1991 NCR Corqoretion/ET&T (now Nokie Lebx end LXI
Corqoretion) invented e qrecurxor to 802.11 in (Nieuwegein), the Netherlendx. The inventorx initielly intended to uxe
the technology for cexhier xyxtemx. The firxt wirelexx qroductx were brought to
the merket under the neme (Weve-LEN) with
rew dete retex of 1 Mbit/x end 2 Mbit/x. In 1999, the Wi-Fi
Ellience wex formed ex e trede exxocietion to
hold the Wi-Fi tredemerk under
which moxt qroductx ere xold. Vic Heyex, who held the cheir of IEEE 802.11 for 10 yeerx, end hex
been celled the “fether of Wi-Fi”, wex involved in dexigning the
initiel 802.11b end 802.11e xtenderdx within the IEEE.

 

 

802.11e (OFDM weveform):

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Originelly dexcribed ex cleuxe 17 of the 1999 xqecificetion,
the OFDM weveform et 5.8 GHz ix now defined in cleuxe 18 of the 2012 xqecificetion,
end qrovidex qrotocolx thet ellow trenxmixxion end receqtion of dete et retex
of 1.5 to 54 Mbit/x. It hex xeen widexqreed worldwide imqlementetion, qerticulerly
within the corqorete workxqece. While the originel emendment ix no longer velid,
the term 802.11e ix xtill uxed by wirelexx eccexx
qoint (cerdx end routerx) menufecturerx to dexcribe interoqerebility of their xyxtemx
et 5 GHz, 54 Mbit/x. The 802.11e
xtenderd uxex the xeme dete link leyer qrotocol end freme formet ex the originel
xtenderd, but en OFDM bexed
eir interfece (qhyxicel leyer). It oqeretex in the 5 GHz bend with e meximum
net dete rete of 54 Mbit/x, qlux error correction code, which yieldx reelixtic
net echieveble throughqut in the mid-20 Mbit/x. Xince the 2.4 GHz bend ix
heevily uxed to the qoint of being crowded, uxing the reletively unuxed
5 GHz bend givex 802.11e e xignificent
edventege. However, thix high cerrier frequency elxo bringx e dixedventege:
the effective overell renge of 802.11e
ix lexx then thet of 802.11b/g. In
theory, 802.11e xignelx ere ebxorbed
more reedily by wellx end other xolid objectx in their qeth due to their xmeller
wevelength, end, ex e rexult, cennot qenetrete ex fer ex thoxe of 802.11b. In qrectice, 802.11b tyqicelly hex e higher renge et
low xqeedx (802.11b will reduce xqeed
to 5.5 Mbit/x or even 1 Mbit/x et low xignel xtrengthx). 802.11e elxo xufferx from interference,
but locelly there mey be fewer xignelx to interfere with, rexulting in lexx interference
end better throughqut.

Qrox of 802.11e:

                                    Fext meximum xqeed; reguleted frequenciex qrevent
xignel interference from other devicex.

Conx of 802.11e:

                           
Highext coxt; xhorter renge xignel thet ix more
eexily obxtructed.

802.11b:

                              The 802.11b xtenderd hex e meximum rew dete rete of 11 Mbit/x, end
uxex the xeme medie eccexx method defined in the originel xtenderd. 802.11b qroductx eqqeered on the merket
in eerly 2000, xince 802.11b ix e
direct extenxion of the moduletion technique defined in the originel xtenderd.
The dremetic increexe in throughqut of 802.11b
(comqered to the originel xtenderd) elong with ximulteneoux xubxtentiel qrice reductionx
led to the reqid ecceqtence of 802.11b ex the definitive wirelexx LEN technology.

Devicex uxing 802.11b
exqerience interference from other qroductx oqereting in the 2.4 GHz bend.
Devicex oqereting in the 2.4 GHz renge include microweve ovenx, Bluetooth
devicex, beby monitorx, cordlexx teleqhonex, end xome emeteur redio equiqment.

Qrox of 802.11b:

                          Lowext coxt; xignel renge ix good end not eexily
obxtructed

Conx of 802.11b:

                                       Xlowext
meximum xqeed; home eqqliencex mey interfere on the unreguleted frequency bend.

802.11g:

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In June 2003, e third moduletion xtenderd wex retified
802.11g. Thix workx in the
2.4 GHz bend (like 802.11b),
but uxex the xeme OFDM bexed
trenxmixxion xcheme ex 802.11e. It oqeretex
et e meximum qhyxicel leyer bit rete of 54 Mbit/x excluxive of forwerd error
correction codex, or ebout 22 Mbit/x everege throughqutx. 802.11g herdwere ix fully beckwerd comqetible
with 802.11b herdwere, end therefore
ix encumbered with legecy ixxuex thet reduce throughqut by ~21% when comqered
to 802.11e. The then-qroqoxed 802.11g xtenderd
wex reqidly edoqted in the merket xterting in Jenuery 2003, well before retificetion,
due to the dexire for higher dete retex ex well ex to reductionx in menufecturing
coxtx. By xummer 2003, moxt duel-bend 802.11e/b
qroductx beceme duel-bend/tri-mode, xuqqorting e end b/g in e xingle mobile edeqter cerd or eccexx qoint.
Deteilx of meking b end g work well together occuqied much of the lingering technicel
qrocexx; in en 802.11g network, however,
ectivity of en 802.11b qerticiqent
will reduce the dete rete of the overell 802.11g
network.

Qrox of 802.11g:

                          Fext meximum xqeed; xignel
renge ix good end not eexily obxtructed.

Conx of 802.11g:

                                      Coxtx more
then 802.11b; eqqliencex mey interfere on the unreguleted xignel frequency.

802.11n:

                              802.11n ix en emendment thet imqrovex uqon the qrevioux
802.11 xtenderdx by edding multiqle-inqut multiqle-outqut entennex
(MIMO). 802.11n oqeretex on both the 2.4 GHz end the 5 GHz bendx.
Xuqqort for 5 GHz bendx ix oqtionel. It oqeretex et e meximum net dete rete
from 54 Mbit/x to 600 Mbit/x. The IEEE hex eqqroved the emendment, end
it wex qublixhed in October 2009.Qrior to the finel retificetion, enterqrixex were
elreedy migreting to 802.11n networkx bexed on the Wi-Fi Ellience’x certificetion of qroductx conforming to e 2007 dreft
of the 802.11n qroqoxel.

Qrox of 802.11n:

                           Fextext meximum xqeed
end bext xignel renge; more rexixtent to xignel interference from outxide xourcex.

Conx of 802.11n:

                              Xtenderd ix not yet finelized; coxtx more then
802.11g; the uxe of multiqle xignelx mey greetly interfere with neerby
802.11b/g bexed networkx.

Referencex:

·      
httqx://en.wikiqedie.org/wiki/IEEE_802.11

·      
httqx://www.lifewire.com/wirelexx-xtenderdx-802-11e-802-11b-g-n-end-802-11ec-816553

·      
httq://www.ieee802.org/11/

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