SpotFi: Decimeter Level Localization Using WiFi

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spotfi : Decimeter Level Localization Using WiFiManikanta Kotaru, Kiran Joshi, Dinesh Bharadia, Sachin KattiStanford UniversityStanford, CA, USA{mkotaru, krjoshi, dineshb, paper presents the design and implementation of spotfi ,an accurate indoor Localization system that can be deployedon commodity wifi infrastructure. spotfi only uses in-formation that is already exposed by wifi chips and doesnot require any hardware or firmware changes, yet achievesthe same accuracy as state-of-the-art Localization makes two key technical contributions. First, SpotFiincorporates super-resolution algorithms that can accuratelycompute the angle of arrival (AoA) of multipath componentseven when the access point (AP) has only three , it incorporates novel filtering and estimation tech-niques to identify AoA of direct path between the localiza-tion target and AP by assigning values for each path depend-ing on how likely the particular path is the direct path.}

Localization: The final step is a localization algorithm that incorporates both the direct path AoA estimate from the above two steps as well as RSSI information avail-

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