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Design WLAN

Design WLAN. Politeknik Telkom 2008. Design WLAN. Step to design WLAN : Location Survey Topology Distance calculating Antenna design Towering Power calculation Radio choosing. Location survey. Tools : Spectrum analyzer GPS Map Laptop Netstumbler (www.netstumbler.com). Netstumbler.

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Design WLAN

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  1. Design WLAN Politeknik Telkom 2008

  2. Design WLAN Step to design WLAN : • Location Survey • Topology • Distance calculating • Antenna design • Towering • Power calculation • Radio choosing

  3. Location survey Tools : • Spectrum analyzer • GPS • Map • Laptop • Netstumbler (www.netstumbler.com)

  4. Netstumbler

  5. Coverage area vs number acces point  AP = C Total C(AP) dimana : AP : Number of Access Point C(AP) : coverage area of AP (maximum power) C Total : total of coverage area

  6. Antenna design Parameter of antenna quality : • Impedance • SWR • Gain • S/N

  7. Antenna design Software : MMANA-GAL http://mmhamsoft.amateur-radio.ca/

  8. MMANA-GAL

  9. MMANA-GAL  vertical lobe

  10. MMANA-GAL  horisontal lobe

  11. MMANA-GAL  impedance vs frequency

  12. MMANA-GAL  SWR vs frequency

  13. Towering Model of tower :

  14. Power calculation

  15. Power calculation Parameter of power calculation : • RX signal level (dBm) • Free Space Loss (dB) • SOM (dB)

  16. Power calculation Input parameter Free Space Loss : • Frequency (MHz) • Distance

  17. Power calculation Input parameter Rx Signal Level : • TX Power (dBm) • TX Cable Loss (dB) • TX Antena Gain (dBi) • Free Space Loss (FSL) • RX Antena Gain (dBi) • RX Cable Loss (dB

  18. Power calculation Input parameter SOM : • Rx signal level • Rx sensitivity

  19. Power calculation Example : • Frequency = 2,45 GHz • Distance between 2 station = 16 miles • TX Power = 9,9 dBm • TX Cable Loss = 5,1 dB • TX Antena Gain = 24 dBi • RX Antena Gain = 20 dBi • RX Cable Loss = 3 dB • RX Sensitivity = 15 dBm

  20. Power calculation Calculate : • Free Space Loss • Rx Signal level • SOM (System Operating Margin)

  21. Reuse frequency

  22. EIRP • EIRP (Effective Isotropic Radiated Power) • EIRP (dBm) = TX Power (dBm) – TX Cable Loss (dB) + TX Antena Gain (dBi)

  23. EIRP

  24. EIRP Example : A directional antenna 24 dBi has EIRP 36 dBm, cable loss 3 dB. Tx Power?

  25. EIRP Answer : EIRP (dBm)= TX Power (dBm) – TX Cable Loss (dB) + TX Antena Gain (dBi) 36 = TX (dBm) – 3 + 24 TX (dBm) = 36+3-24 = 15 dBm = 30 mW

  26. Channel of Wifi IEEE 802.11b

  27. Channel of Wifi IEEE 802.11b

  28. WiFi 802.11b • Modulation : DSSS • Width of spectrum : 22 MHz

  29. 802.11b spectrum

  30. Overlapping channel

  31. Overlapping channel 3 non overlapping channel : • Channel 1 = 2412 MHz • Channel 6 = 2437 MHz • Channel 11 = 2462 MHz

  32. Overlapping channel 4 non overlapping channel : • Channel 1 = 2412 MHz • Channel 5 = 2432 MHz • Channel 9 = 2452 MHz • Channel 13 = 2472 MHz

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