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Understanding Wireless Measurements: Methods and Tools for Coverage Mapping

This course module focuses on the fundamentals of wireless measurements, emphasizing tools and procedures for effective coverage mapping. Participants will learn about the significance of Signal-to-Noise Ratio (SNR) in various contexts, including distance, performance, and delivery ratio through real measurements. The course includes logistics for indoor and outdoor experiments, group collaborations, and the use of specialized tools such as WiFiFoFum and Netstumbler. Students will conduct hands-on experiments to understand wireless coverage and its implications in different environments.

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Understanding Wireless Measurements: Methods and Tools for Coverage Mapping

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  1. CEN6930: Wireless Experiments Background Wireless Measurements: Shao-Cheng Wang ( shaochew@ufl.edu ) Instructor: Dr. Helmy

  2. Part I: Wireless MeasurementsAgenda • Introduction • Wireless measurement fundamentals • Tools/Procedures • Reference

  3. http://www.ittc.ku.edu/wlan/images.shtml How does a coverage map look like?

  4. coverage maps (cont’d)

  5. Wireless fundamentals: SNR v.s. Distance

  6. Wireless fundamentals: SNR v.s. Performance SNR v.s. Delivery ratio (emulator) SNR v.s. Delivery ratio (real measurement) SNR v.s. TCP Tput (real measurement)

  7. Tools (cont’d) • HP iPAQ: WiFiFoFum

  8. Tools • Site-surveyer: Netstumbler (www.netstumbler.com) • Signal (in –dbm), SNR • AP MAC, SSID

  9. Wireless coverage experiments Indoor measurements Outdoor measurements

  10. Indoor measurements

  11. Outdoor measurements

  12. Logistics • Exp: starts this week (?) • Form groups: 4~5 ppl • Equipment checkout: CSE401 • Bring your ID • 11am~6pm, no overnight checkout • Preparations • Materials • link: http://www.cise.ufl.edu/~sw0/cen6930/ • Software • Wififofum: pocket pc wifi scanner http://www.aspecto-software.com/rw/applications/wififofum/ • Knsgem: convert wifi scanner output to google earth kml • Google earth • Bonus • Outside campus areas!! (e.g. downtown Gainesville) http://www.digitaldowntown.net/

  13. Potential experiment topics • Coverage Map: • Create a coverage map of your choice: • SNR (enhanced with levels, dbm #’s) • SNR variations (weather, day/night) • Performance map • Find holes, additions, tech heterogeneity (11a/b/g/e/n) etc. (please coordinate between groups for the area of interest) • Reason about your choice and the implications of practicability • Observations/Surprises? • AP Hunting/Coverage/Handover • Locate APs in some specific areas/buildings • Create an AP-specific coverage map • AP-coverage/handover map for routes on campus • Observations and discussions about the AP planning (evaluation of planning, tradeoffs, applications, etc.)

  14. Reference • Simon Byers and Dave Kormann, “802.11b access point mapping,” Communications of the ACM, May 2003. • Daniel Aguayo, John Bicket, Sanjit Biswas, Glenn Judd, Robert Morris, “Link-level Measurements from an 802.11b Mesh Network,” SIGCOMM 2004, August 2004 • Hiroto Aidal, Yosuke Tamura2, Yoshito Tobe2, Hideyuki Tokudal, “Wireless Packet Scheduling with Signal-to-Noise Ratio Monitoring,” LCN 2000

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