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Monday, February 9, 2015

Difference Between Wi-Fi and Wi-Max


Parameter
Wi-Fi
Wi-Max
Acronym for
Wireless Fidelity
World Interoperability for Microwave Access
Description
It is a wireless technology that allows any electronic device to exchange and transfer data wirelessly.
It a wireless technology which delivers carrier class, high speed wireless broadband at low cost and covering large distance than Wi-Fi.
IEEE Standard
IEEE 802.11
IEEE 802.16
Implementation
It is basically an implementation of wireless Local Area Connection within a small building, a college, or an institutional building.
It is a wireless broadband metropolitan technology whose objective is to interconnect houses, buildings, or even hot spots to allow communication between them or with other networks.
Cost
Can be implemented by using low cost access pints.
Wi-Max technology requires costly infrastructure.
Frequency band
2.4 GHz to 5 GHz
Licensed/Unlicensed 2 GHz to 11 GHz
Channel Bandwidth
Wi-Fi 802.11b= 25 MHz
Wi-Fi 802.11 a/g=20 MHz
Adjustable 1.25 M to 20
MHz
Full/Half Duplex
Half Duplex
Full Duplex

Radio Technology
Wi-Fi 802.11b= Direct Sequence Spread Spectrum
Wi-Fi 802.11 a/g= OFDM (64-channels)
OFDM (256-channels)
Bandwidth Efficiency
Wi-Fi 802.11b= <=0.44 bps/Hz
Wi-Fi 802.11 a/g= <=2.7 bps/Hz
<=5 bps/Hz

Modulation
BPSK, QPSK, 16-, 64- QAM
BPSK, QPSK, 16-, 64-,
256-QAM

Encryption
Optional- RC4 (AES in 802.11i)
Mandatory- 3DES Optional-
AES
Mobility
In Development
Mobile Wi-MAX (802.16e)
Mesh
Vendor Proprietary
Yes
Access Protocol
CSMA/CA
Request/Grant
Coverage
< 100 feet indoor
<1000 feet Outdoor
Fixed Wi-Max=3-5 Miles
Mobile Wi-Max=<2 Miles
Multiplexing
CSMA
TDD,FDD


Terms Used:
IEEE:
Institution of Electrical and Electronics Engineering
ISM: Industrial, Scientific and Medical
U-NII:
Unlicensed National Information Infrastructure
OFDM: Orthogonal Frequency Division Multiplexing
CSMA/CA: Carrier Sense Multiple Access with Collision Avoidance
BPSK:
Binary Phase Shift Keying
QPSK: Quadrature Phase Shift Keying
RC4:
Rivest Cipher 4(Software Steam Cipher)
3DES:
Triple Data Encryption Algorithm
AES:
Advance Encryption Standard
TDD:
Time Division Duplex
FDD:
Frequency Division Duplex
QAM:
Quadrature Amplitude Modulation
Alternate Titles
Difference between Wifi and Wimax
Difference between Wi-Fi and Wi-Max
Wi-Fi vs Wi-Max
Comapare Wi-Fi with Wi-Max