WiFi vs WiMax

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  • + josebohemio PUCMM 4 months ago
    Gracias. esto es de mucha ayuda.
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WiFi vs WiMax - Presentation Transcript

  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
  14. OFDM Sub-channels
  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
    • Thank You

+ hysunghysung, 3 years ago

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