Wi-Fi at a glance
Wireless Fidelity, commonly known as Wi-Fi is defined under the IEEE 802.11x standards. WiMAX, on the other hand, stands for worldwide interoperability for microwave access. Defined under IEEE 802.16 standards, these protocols may work in the industrial, scientific and medical (ISM) bands or they might use a licensed frequency. Wi-Fi networks have a bandwidth of 20MHz, whereas WiMAX networks have a flexible bandwidth option which ranges from 1.25MHz to 20MHz.
Wi-Fi is a certification applied to products tested by the Wi-Fi Alliance, an industry consortium that promotes interoperability in heterogeneous WLANs. For example, all 802.11g products implement standard orthogonal frequency division multiplexing (OFDM) and direct sequence spread spectrum (DSSS), but only Wi-Fi certified products have proven that they correctly support a mandatory subset of features and options.
And here’s WiMax
WiMax is a certification tested by the WiMAX Forum. Carriers build and operate wide metropolitan area networks (WMANs) by purchasing licensed spectrum and then deploying WiMax base stations throughout a city, region, or other designated coverage area. To use WMAN, subscribers must purchase wireless services from a carrier.
WiMax Vs WiFi
The WiMax Vs Wi-Fi table below provides the differences at a glance between the two. Or three, since there are differences in various version as well.
|Features||WiMax (802.16a)||Wi-Fi (802.11b)||Wi-Fi (802.11a/g)|
|Wireless LAN||Wireless LAN|
2 G to 11 GHz
|2.4 GHz ISM||2.4 GHz ISM (g)
5 GHz U-NII (a)
1.25 M to 20 MHz
|25 MHz||20 MHz|
|<=5 bps/Hz||<=0.44 bps/Hz||<=2.7 bps/Hz|
16-, 64-, 256-QAM
|Forward error correction (FEC)||Convolutional Code
(AES in 802.11i)
(AES in 802.11i)
|In development||In development|
|Mesh||Yes||Vendor Proprietary||Vendor Proprietary|
What is WiMax exactly?