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Planning WiFi Networks

Planning WiFi Networks. Narayan Mandayam. Planning WiFi Networks ?. Goals Estimate radio coverage area Estimate performance/throughput Estimate network design parameters Placement of Access Points Transmit power assignment Channel Assignment. Interesting Scenarios.

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Planning WiFi Networks

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  1. Planning WiFi Networks Narayan Mandayam

  2. Planning WiFi Networks ? • Goals • Estimate radio coverage area • Estimate performance/throughput • Estimate network design parameters • Placement of Access Points • Transmit power assignment • Channel Assignment

  3. Interesting Scenarios At which locations will network performance be optimized ? What frequencies ? What Powers ?

  4. Modeling Approach Stochastic approach (wide-area cellular) Deterministic approach (indoor wireless) Ray-tracing (Valenzuela, Rappaport, ...) Measurements (Greenstein, COST, Rappaport, Hata, ...) Deterministic-plus-stochastic approach Ray-tracing AND Measurements • Predictable user behavior (trajectory) • Short-range • No shadowing

  5. Ray Tracing Isotropic power density Power density along the direction of maximum radiation Power received by Antenna PR d PT Model path loss as “free space loss” between any 2 points that have line-of-sight path between them Also known as Friis free space formula Model penetration, absorption and reflection losses through materials Power/Intensity at each point in space is sum of all rays through it

  6. Indoor Signal Measurement

  7. Project 1: WiFi Planning using SpectraPlan • Spectraplan* is a Ray-Tracing based interactive visualization tool that provides spectrum, coverage and throughput maps • Requires Floor-plan of building in question with associated information about wall materials etc. • Goal: Optimize Placement of APs in the WINLAB modular building for coverage and/or throughput • Calibrate Spectraplan output with measurements • Design location tracking algorithms using Spectraplan * Wibhu Technologies (www.wibhu.com) proprietary technology

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