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ROI Analysis of WiFi Offloading PowerPoint Presentation

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About This Presentation

Slide 1 - Spatial Analysis of WiFi Networks
Slide 2 - Spatial Extent Greater Fremont Parts of Mountain View for comparison
Slide 3 - The Network Mostly made up of personal APs Restaurants, etc. offer free WiFi Municipal Networks
Slide 4 - The Network IEEE 802.11b/g 84.5Mc @ 2.4Gc :: 2.401Gc – 2.495Gc c = Hz Amateur Overlap 13cm band :: 2.310Gc – 2.450Gc Why 2.4Gc? Unlicensed spectrum Potential Problems
Slide 5 - IEEE 802.11b/g Spectrum
Slide 6 - Municipal Networks
Slide 7 - Method Used Hardware Software Issues Ideas
Slide 8 - Hardware Laptop Orinoco 802.11g/b cardbus /w antenna “patch” Power inverter for extended logging periods NMEA-0183 GPS + WAAS WGS84 datum / Albert Equal Area projection 1 pps
Slide 9 - Software Commercial NONE Open Source Kismet – WiFi probe GPSd – GPS data logger Kismet reads from GRASS GIS – Data analysis and visualization software Python - Scripting
Slide 10 - Issues Kismet generates bad data until a GPS lock is acquired Some Windows drivers leak memory into the SSID, rendering them useless for naming Assumes isotropic radiator given the bounds of GPS coordinates GPS can “wander” DGPS preferred
Slide 11 - Ideas Use external gain antenna for improved reception Must have card with antenna “patch” or willingness to destroy card Must use high quality, extremely low loss coax with shortest runs possible And/or mount AP in vehicle trunk and mount antenna directly above Difficult, but can be done
Slide 12 - Interesting Facts Number of AP Manufacturers: 17 Number of APs: 3575 Number of public APs: 44 :: 1.2% Number of open APs: 1129 :: 32% “Seven Words”: 3 Number of amusing SSIDs: Not enough
Slide 13 - AP Types
Slide 14 - AP Manufacturers
Slide 15 - South Bay AP Density
Slide 16 - Fremont AP Density
Slide 17 - 3D View – Fremont APs
Slide 18 - What's Next? Log more data Trending Time-series analysis Better AP spatial approximation Make more maps with reasonable resolution Mount external gain omni antenna Extrude AP range to 3D for visualization
Slide 19 - References Kismet – http://kismetwireless.net GRASS GIS - http://grass.itc.it Dylan Beaudette - http://casoilresource.lawr.ucdavis.net Matt Perry - http://perrygeo.net/wordpress FCC - http://fcc.gov
 

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