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Design WLAN
Politeknik Telkom 2008
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Design WLAN
Step to design WLAN :1. Location Survey2. Topology3. Distance calculating4. Antenna design5. Towering6. Power calculation7. Radio choosing
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Location survey
Tools :Spectrum analyzerGPSMapLaptopNetstumbler (www.netstumbler.com)
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Netstumbler
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Coverage area vs number acces point
AP = C Total C(AP) dimana :AP : Number of Access PointC(AP) : coverage area of AP (maximum
power)C Total : total of coverage area
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Antenna design
Parameter of antenna quality :ImpedanceSWRGainS/N
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Antenna design
Software :
MMANA-GAL
http://mmhamsoft.amateur-radio.ca/
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MMANA-GAL
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MMANA-GAL vertical lobe
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MMANA-GAL horisontal lobe
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MMANA-GAL impedance vs frequency
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MMANA-GAL SWR vs frequency
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Towering
Model of tower :
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Power calculation
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Power calculation
Parameter of power calculation :RX signal level (dBm)Free Space Loss (dB)SOM (dB)
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Power calculation
Input parameter Free Space Loss :Frequency (MHz)Distance
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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
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Power calculation
Input parameter SOM :Rx signal levelRx sensitivity
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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
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Power calculation
Calculate :a. Free Space Lossb. Rx Signal levelc. SOM (System Operating Margin)
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Reuse frequency
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EIRP
EIRP (Effective Isotropic Radiated Power)
EIRP (dBm) = TX Power (dBm) – TX Cable Loss (dB) + TX Antena Gain (dBi)
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EIRP
TX Power
Power Gain / Loss
Resulting
Power
Antenna gain
Resulting EIRP
Legal ?
1 Watt(+30 dBm)
-1 dB loss via 1 m coax
+ 29 dBm
+6 dBi
+35 dBm Yes
100 mW(+20 dBm)
+14 dB Amplifier
+34 dBm
+8 dBi
+42 dBm No
25 mW(+14 dBm)
+14 dB Amplifier
+28 dBm
+8 dBi
+36 dBm Yes
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EIRP
Example :A directional antenna 24 dBi has EIRP 36
dBm, cable loss 3 dB. Tx Power?
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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
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Channel of Wifi IEEE 802.11b
Channel ID
Channel Frekuensi F(t) MHz
Alokasi Frekuensi Tiap Pancar (MHz)
F(t )- 11MHz F(t) + 11 MHz
1 2412 2401 24232 2417 2406 24283 2422 2411 24334 2427 2416 24385 2432 2421 24436 2437 2426 24487 2442 2431 2453
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Channel of Wifi IEEE 802.11b
8 2447 2436 2458
9 2452 2441 2463
10 2457 2446 2468
11 2462 2451 2473
12 2467 2456 2478
13 2472 2461 2483
14 2477 2466 2488
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WiFi 802.11b
Modulation : DSSSWidth of spectrum : 22 MHz
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802.11b spectrum
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Overlapping channel
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Overlapping channel
3 non overlapping channel :Channel 1 = 2412 MHzChannel 6 = 2437 MHzChannel 11 = 2462 MHz
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Overlapping channel
4 non overlapping channel :Channel 1 = 2412 MHzChannel 5 = 2432 MHzChannel 9 = 2452 MHzChannel 13 = 2472 MHz