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Long Distance Links Ermanno Pietrosemoli Fundación EsLaRed University of Los Andes
Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What do we need for long distance links? ,[object Object],[object Object],[object Object]
[object Object],[object Object],How de we improve the power budget? ,[object Object],[object Object],Threshold Rx Gr Tx Gt At Ar Pr Pt Free Space Loss dBm km L= 92,4 +20 log(d/km)+20 log(f/GHz)   Margin
[object Object],[object Object],[object Object],How do we improve the power budget?
Antenna Alignment ,[object Object],[object Object],[object Object],[object Object]
[object Object],Antenna Alignment
[object Object],[object Object],[object Object],[object Object],Antenna Alignment Suggested tools: Network Stumbler is a very useful program for measuring both the  received  signal level and the noise
[object Object],[object Object],[object Object],Antenna Alignment Suggested tools: ,[object Object],clinometer
[object Object],[object Object],Antenna Alignment Preparation:
Antenna Alignment Field Work: ,[object Object],[object Object],[object Object],Visual Alignment Marco Zennaro and Tomas Krag
Antenna Alignment ,[object Object],[object Object],[object Object],[object Object]
Antenna Alignment ,[object Object],[object Object],[object Object],Visual alignment. Javier Triviño
Antenna Alignment False Maximum: ,[object Object],Antenna radiation pattern
Vertical Antenna Alignment AA Elevation adjustment ,[object Object]
Antenna Alignment ,[object Object],[object Object],[object Object]
Antenna Alignment ,[object Object],[object Object],[object Object]
Magnetic and geographic bearing ,[object Object]
Magnetic Declination ,[object Object],[object Object],[object Object],[object Object],[object Object],C Compass and geographic north landmark El Baúl, Venezuela
Antenna Alignment ,[object Object],[object Object],[object Object],Google Earth map:  www.google.com
[object Object],[object Object],Antenna Alignment
Antenna Alignment When the remote end is NOT visible: ,[object Object],[object Object],[object Object]
Antenna Alignment ,[object Object],Antenna Alignment using instruments   30 dBi  Antenna 30 dBi Antenna  FSL= 149 dB @ 279 km HP 8594E S. Analyzer EIRP= 56 dBm HP 8648C Signal Gen. Fc= 2400 MHz Amp. 500 mW  Pr = -66 dBm Span = 10 MHz 1 dB cable loss 1 dB cable loss
[object Object],[object Object],Antenna Alignment ,[object Object],Received tone at 382 km
Antenna Alignment: Low cost analyzer ,[object Object],[object Object],[object Object]
Antenna Alignment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Antenna Alignment ,[object Object],[object Object],[object Object],[object Object]
Media access techniques ,[object Object],[object Object],[object Object],[object Object]
Antenna Alignment Software for antenna alignment
Medium Access Mechanism ,[object Object],[object Object],Source:  WiLDNet: High performance WiFi-based Long Distance (WiLD) Networks, Sonesh SuranaTIER, UC Berkeley , 2007.Community Wireless Summit , May 18, 2007 , Loyola College, Columbia, MD
Medium access mechanism ,[object Object],Source:  WiLDNet: High performance WiFi-based Long Distance (WiLD) Networks, Sonesh SuranaTIER, UC Berkeley , 2007. Community Wireless Summit , May 18, 2007 , Loyola College, Columbia, MD  Throughput Vs distance for a point to point WiFi link. Note that eliminating the waiting  for ACKs the throughput becomes independent of distance.
Medium acces mechanism ,[object Object],[object Object],[object Object]
Medium acces mechanism ,[object Object],[object Object],[object Object]
Medium acces mechanism ,[object Object],[object Object],[object Object]
79 km link Profile of the 79 km link. The throughput with radios using the TIER modification was as predicted
280 km link ,[object Object],Profile for the 280 km. Propagation time is  2 ms.
382 km link ,[object Object]
The 5 GHz band ,[object Object],[object Object],[object Object]
The 5 GHz band ,[object Object],[object Object]
The 5 Ghz band ,[object Object],[object Object],[object Object],[object Object]
The 5 GHz band I do not know of any low cost device for antenna alignment in this frequency band  Please let me know if you find any suitable device
The 5 GHz band 5,8 GHz link. Although only 16 kilometers long, one of the ends is at  4765 m altitude and transmits the output of a webcam pointed at Pico Bolívar, at 5000 m  altitude. Operational since 2002 http://www.eslared.org.ve
Conclusions ,[object Object],[object Object],[object Object],[object Object]
Conclusions (cont.) ,[object Object],[object Object]

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Long distance wireless link

  • 1. Long Distance Links Ermanno Pietrosemoli Fundación EsLaRed University of Los Andes
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  • 30. Antenna Alignment Software for antenna alignment
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  • 36. 79 km link Profile of the 79 km link. The throughput with radios using the TIER modification was as predicted
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  • 42. The 5 GHz band I do not know of any low cost device for antenna alignment in this frequency band Please let me know if you find any suitable device
  • 43. The 5 GHz band 5,8 GHz link. Although only 16 kilometers long, one of the ends is at 4765 m altitude and transmits the output of a webcam pointed at Pico Bolívar, at 5000 m altitude. Operational since 2002 http://www.eslared.org.ve
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