Thursday, September 04, 2008

WiFi Vs. WiMax


Wireless Compared
WiFi WiMax
Recommended Uses Short-range, LAN-centric Long-range, MAN-centric
Spectrum Unlicensed spectrum
802.11b/g – 2.4 GHz
802.11n – 2.4 GHz, 5 GHz
Unlicensed or licensed spectrum between 2-66 GHz
US: 2.4 GHz
International: 2.3 GHz, 3.5 GHz
Quality of Service Minimal - QoS is relative only between packets/flows Guaranteed - QoS is assured using scheduling algorithms at MAC layer
Cell Footprint < 300 meters maximum
Most implementations about 30 meters
Up to 10 kilometers
Most implementations about 3 km
Bandwidth 802.11b: 11 Mbps max
802.11g: 54 Mbps max
802.11n: at least 100 MbpsAll bandwidth is at short range
Up to 70 Mbps theoretical max
Up to 40 dedicated subscriber channels
Expect 15 Mbps at 3 km range
A comparison of typical WiFi and WiMax performance characteristics