WiFi vs WiMax

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WiFi vs WiMax

  1. 1. WiFi vs WiMAX 宋懷遠
  2. 2. Standard Compliant <ul><li>WiFi-------802.11a/b/g (fixed wireless) </li></ul><ul><li>WiMAX---802.16d (fixed wireless) </li></ul><ul><li>WiMAX---802.16e (mobile wireless) </li></ul>
  3. 3. Application Area <ul><li>WiFi------WLAN </li></ul><ul><li>Wireless Local Area Network </li></ul><ul><li>WiMAX—WMAN </li></ul><ul><li>Wireless Metropolitan Area Network </li></ul>
  4. 4. Frequency Band <ul><li>802.11g-----2.4G </li></ul><ul><li>802.11a-----5G </li></ul><ul><li>802.16d-----2-11GHz </li></ul><ul><li>802.16e-----2-6GHz </li></ul>
  5. 5. 11b/g 2.4G
  6. 6. 11a 5GHz
  7. 7. Communication Range <ul><li>11bg: 100 meters </li></ul><ul><li>11a : 50 meters </li></ul><ul><li>16d : up to 30miles </li></ul><ul><li>16e : 1-3 miles </li></ul>
  8. 8. Mobility <ul><li>WiFi---Nomadic </li></ul><ul><li>16d---Nomadic </li></ul><ul><li>16e---Mobile (20-100km/h) </li></ul>
  9. 9. QoS <ul><li>WiFi-------No support </li></ul><ul><li>WiMAX---Support on demand </li></ul>
  10. 10. Data Rate <ul><li>11.b—11Mbps </li></ul><ul><li>11.ag—54Mbps </li></ul><ul><li>16d-----75Mbps @20MHz bandwidth </li></ul><ul><li>16e-----15Mbps @5MHz bandwidth </li></ul>
  11. 11. Modulation <ul><li>11b--------DSSS </li></ul><ul><li>11a,g-----OFDM </li></ul><ul><li>OFDM----16d </li></ul><ul><li>OFDMA--16e </li></ul>
  12. 12. Channel Bandwidth <ul><li>Wi-Fi ------20MHz Fixed </li></ul><ul><li>16d---------1.75-20MHz </li></ul><ul><li>16e---------1.75-5MHz </li></ul>
  13. 13. OFDM Tone Number <ul><li>WiFi-----OFDM64 </li></ul><ul><li>16d------OFDM 256 FFT </li></ul><ul><li>16e------Scalable OFDMA128 to 2048 FFT </li></ul><ul><li>OFDM---All Sub-carrier Tx at once </li></ul><ul><li>OFDMA—Divided to sub-channels with different modulation type BPSK,QPSK,16QAM and 64QAM </li></ul>
  14. 14. OFDM Sub-channels
  15. 15. MIMO Support <ul><li>WiFi----------802.11n </li></ul><ul><li>WiMAX------802.16e </li></ul>
  16. 16. MAC <ul><li>Wi Fi---CSMA/CA Based </li></ul><ul><li>Fall apart of a certain number of user </li></ul><ul><li>WiMAX---TDD/FDD Based </li></ul>
  17. 17. Channel Condition <ul><li>WiFi----NLOS </li></ul><ul><li>16d-----NLOS </li></ul><ul><li>16e-----NLOS </li></ul>
  18. 18. Soft Handover <ul><li>No-----WiFi </li></ul><ul><li>Yes---802.16e </li></ul>
  19. 19. Spectrum <ul><li>WiFi------Un-license band </li></ul><ul><li>WiMAX--License and Un-license band </li></ul>
  20. 20. <ul><li>Thank You </li></ul>

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