新颖的WIFI接入点(AP)定位技术,使用智能手机.pptxVIP

I Am the Antenna:Accurate Outdoor AP Location using Smartphones;2;Ubiquitous Broadband Access;AP Location: A Critical Function;AP Location: A Critical Function;AP Location: Related Work;Conventional AP Location Methods;Insight: The Body Blocking Effect;Rotation based Measurement;Generality of the Effect;User Rotation based AP Location;Directional Analysis Is Non-Trivial;Signal degradation occurs at a range of directions ;Find the sector with the largest RSS degradation Sliding window Sin: average RSS inside the sliding sector Sout: average RSS outside the sliding sector degradation = Sout - Sin ;Navigation;Application layer Leveraging WiFi scan to read RSS Default scan is very slow Scanning all channels each time OS layer Modified WiFi driver Scanning the interested channel only Accelerate the process: 10 seconds per rotation (10 times faster) Save power: WiFi’s energy consumption is 14 times less;Testing Scenarios;We compared Borealis to Offline Analysis: clustering-based ML method Optimized by training set, can be upper bound of directional analysis GUIDE: RSS gradient based(Online算法) Min RSS: minimum RSS direction based(基准算法);Navigation Efficiency;Most APs are mounted inside buildings We mounted the AP on a table in our lab Try to locate it outside in Complex LOS/NLOS environment ;Conclusion