WiFi vs WiMAX 宋懷遠

Standard Compliant WiFi-------802.11a/b/g (fixed wireless) WiMAX---802.16d (fixed wireless) WiMAX---802.16e (mobile wireless)

WiFi-------802.11a/b/g (fixed wireless)

WiMAX---802.16d (fixed wireless)

WiMAX---802.16e (mobile wireless)

Application Area WiFi------WLAN Wireless Local Area Network WiMAX—WMAN Wireless Metropolitan Area Network

WiFi------WLAN

Wireless Local Area Network

WiMAX—WMAN

Wireless Metropolitan Area Network

Frequency Band 802.11g-----2.4G 802.11a-----5G 802.16d-----2-11GHz 802.16e-----2-6GHz

802.11g-----2.4G

802.11a-----5G

802.16d-----2-11GHz

802.16e-----2-6GHz

11b/g 2.4G

11a 5GHz

Communication Range 11bg: 100 meters 11a : 50 meters 16d : up to 30miles 16e : 1-3 miles

11bg: 100 meters

11a : 50 meters

16d : up to 30miles

16e : 1-3 miles

Mobility WiFi---Nomadic 16d---Nomadic 16e---Mobile (20-100km/h)

WiFi---Nomadic

16d---Nomadic

16e---Mobile (20-100km/h)

QoS WiFi-------No support WiMAX---Support on demand

WiFi-------No support

WiMAX---Support on demand

Data Rate 11.b—11Mbps 11.ag—54Mbps 16d-----75Mbps @20MHz bandwidth 16e-----15Mbps @5MHz bandwidth

11.b—11Mbps

11.ag—54Mbps

16d-----75Mbps @20MHz bandwidth

16e-----15Mbps @5MHz bandwidth

Modulation 11b--------DSSS 11a,g-----OFDM OFDM----16d OFDMA--16e

11b--------DSSS

11a,g-----OFDM

OFDM----16d

OFDMA--16e

Channel Bandwidth Wi-Fi ------20MHz Fixed 16d---------1.75-20MHz 16e---------1.75-5MHz

Wi-Fi ------20MHz Fixed

16d---------1.75-20MHz

16e---------1.75-5MHz

OFDM Tone Number WiFi-----OFDM64 16d------OFDM 256 FFT 16e------Scalable OFDMA128 to 2048 FFT OFDM---All Sub-carrier Tx at once OFDMA—Divided to sub-channels with different modulation type BPSK,QPSK,16QAM and 64QAM

WiFi-----OFDM64

16d------OFDM 256 FFT

16e------Scalable OFDMA128 to 2048 FFT

OFDM---All Sub-carrier Tx at once

OFDMA—Divided to sub-channels with different modulation type BPSK,QPSK,16QAM and 64QAM

OFDM Sub-channels

MIMO Support WiFi----------802.11n WiMAX------802.16e

WiFi----------802.11n

WiMAX------802.16e

MAC Wi Fi---CSMA/CA Based Fall apart of a certain number of user WiMAX---TDD/FDD Based

Wi Fi---CSMA/CA Based

Fall apart of a certain number of user

WiMAX---TDD/FDD Based

Channel Condition WiFi----NLOS 16d-----NLOS 16e-----NLOS

WiFi----NLOS

16d-----NLOS

16e-----NLOS

Soft Handover No-----WiFi Yes---802.16e

No-----WiFi

Yes---802.16e

Spectrum WiFi------Un-license band WiMAX--License and Un-license band

WiFi------Un-license band

WiMAX--License and Un-license band

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