SpotFi: Decimeter Level Localization Using WiFi

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.}

these systems is to calculate the AoAs of the multipath sig-nals received at each AP, find the AoA of the direct path to the target, and then apply triangulation to localize [1, 2, 6, 23, 24, 8, 25]. The best known such systems have demon-strated significant improvements in accuracy with median accuracy on the order of 0.4 m [1, 2].

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