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Wi-Fi IEEE Standards

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The 802.11 standard is defined through several specifications of WLANs. It defines an over-the-air interface between a wireless client and a base station or between two wireless clients.

There are several specifications in the 802.11 family:

Here is the technical camparsion between the three major Wi-Fi standards.

FreatureWi-Fi
(802.11b)
Wi-Fi
(802.11a/g)
Primary
Application
Wireless LANWireless LAN
Frequency Band2.4 GHz ISM2.4 GHz ISM (g)
5 GHz U-NII (a)
Channel
Bandwidth
25 MHz20 MHz
Half/Full DuplexHalfHalf
Radio TechnologyDirect Sequence
Spread Spectrum
OFDM
(64-channels)
Bandwidth
Efficiency
<=0.44 bps/Hz<=2.7 bps/Hz
ModulationQPSKBPSK, QPSK,
16-, 64-QAM
FECNoneConvolutional Code
EncryptionOptional- RC4
(AES in 802.11i)
Optional- RC4
(AES in 802.11i)
MobilityIn developmentIn development
MeshVendor
Proprietary
Vendor Proprietary
Access ProtocolCSMA/CACSMA/CA

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