WiFi vs WiMax
- 1. WiFi vs WiMAX 宋懷遠
- 2. Standard Compliant WiFi-------802.11a/b/g (fixed wireless) WiMAX---802.16d (fixed wireless) WiMAX---802.16e (mobile wireless)
- 3. Application Area WiFi------WLAN Wireless Local Area Network WiMAX—WMAN Wireless Metropolitan Area Network
- 4. Frequency Band 802.11g-----2.4G 802.11a-----5G 802.16d-----2-11GHz 802.16e-----2-6GHz
- 5. 11b/g 2.4G
- 6. 11a 5GHz
- 7. Communication Range 11bg: 100 meters 11a : 50 meters 16d : up to 30miles 16e : 1-3 miles
- 8. Mobility WiFi---Nomadic 16d---Nomadic 16e---Mobile (20-100km/h)
- 9. QoS WiFi-------No support WiMAX---Support on demand
- 10. Data Rate 11.b—11Mbps 11.ag—54Mbps 16d-----75Mbps @20MHz bandwidth 16e-----15Mbps @5MHz bandwidth
- 11. Modulation 11b--------DSSS 11a,g-----OFDM OFDM----16d OFDMA--16e
- 12. Channel Bandwidth Wi-Fi ------20MHz Fixed 16d---------1.75-20MHz 16e---------1.75-5MHz
- 13. 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
- 15. MIMO Support WiFi----------802.11n WiMAX------802.16e
- 16. MAC Wi Fi---CSMA/CA Based Fall apart of a certain number of user WiMAX---TDD/FDD Based
- 17. Channel Condition WiFi----NLOS 16d-----NLOS 16e-----NLOS
- 18. Soft Handover No-----WiFi Yes---802.16e
- 19. Spectrum WiFi------Un-license band WiMAX--License and Un-license band
- 20. Thank You