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The growing commercial interest in indoor locationbased services (ILBS) has spurred recent development of many indoor positioning techniques. Due to the absence of global positioning system (GPS) signal, many other signals have been proposed for indoor usage. Among them, Wi-Fi (802.11) emerges as a promising one due to the pervasive deployment of wireless LANs (WLANs). In particular, Wi-Fi fingerprinting has been attracting much attention recently because it does not require line-of-sightdoi:10.1109/comst.2015.2464084 fatcat:vgqxvxzrl5ddte7xi4x4rnd5oa