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• W2519504401 abstract "Wi-Fi fingerprinting has been extensively studied for indoor localization due to its deployability under pervasive indoor WLAN. As the signals from access points (APs) may change due to, for example, AP movement or power adjustment, the traditional approach is to conduct site survey regularly in order to maintain localization accuracy, which is costly and time-consuming. Here, we study how to accurately locate a target and automatically update fingerprints in the presence of altered AP signals (or simply, “altered APs”). We propose Localization with Altered APs and Fingerprint Updating (LAAFU) system, employing implicit crowdsourced signals for fingerprint update and survey reduction. Using novel subset sampling, LAAFU identifies any altered APs and filter them out before a location decision is made, hence maintaining localization accuracy under altered AP signals. With client locations anywhere in the region, fingerprint signals can be adaptively and transparently updated using non-parametric Gaussian process regression. We have conducted extensive experiments in our campus hall, an international airport, and a premium shopping mall. Compared with traditional weighted nearest neighbors and probabilistic algorithms, results show that LAAFU is robust against altered APs, achieving 20 percent localization error reduction with the fingerprints adaptive to environmental signal changes." @default.
• W2519504401 created "2016-09-23" @default.
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• W2519504401 date "2017-07-01" @default.
• W2519504401 modified "2023-09-30" @default.
• W2519504401 title "Indoor Localization and Automatic Fingerprint Update with Altered AP Signals" @default.
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• W2519504401 doi "https://doi.org/10.1109/tmc.2016.2608946" @default.
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