Abstract
Wireless local area network (WLAN) based indoor localization is expanding its fast-paced adoption to facilitate a variety of indoor location-based services (ILBS). Unfortunately, the performance of current WLAN localization systems relying on fixed access points (APs) deployment is constrained by the spatial localizability variance (SLV) problem that different locations may exhibit significantly distinct localization resolution. Prior approaches tackle this problem through nomadic APs with favorable mobility to dynamically adjust the network topology. However, the lack of prior knowledge of nomadic AP’s position has been a challenge for location distinction and will lead to prohibitive performance degradation. In this paper, we propose and develop CNLoc, a novel CSI-based (Channel State Information) indoor WLAN localization framework to overcome the location uncertainty of nomadic APs. Our implementation and evaluation show that CNLoc can improve the accuracy with unknown location information of nomadic APs. We also discuss some open issues and new possibilities in future nomadic AP based indoor localization.
Highlights
The rapid proliferation of indoor location-based services (ILBS) has spurred the indoor location market [9], leading to a rash of proposals for developing new localization systems [21]
An important issue is the placement of Wireless local area network (WLAN) access points (APs), which is very difficult since most APs are deployed for wireless communications
In this paper, we propose a new design of CNLoc, to tackle the challenges brought by nomadic APs in indoor WLAN localization
Summary
The rapid proliferation of indoor location-based services (ILBS) has spurred the indoor location market [9], leading to a rash of proposals for developing new localization systems [21]. WLAN-based indoor localization is one of the most efficient methodologies, which applies general WiFi devices in position analysis. In the deployment of WLAN-based indoor localization services, there are some issues which affect the localization accuracy. An important issue is the placement of WLAN access points (APs), which is very difficult since most APs are deployed for wireless communications. Nomadic APs are those mobile devices that can provide localization services, which brings an opportunity for deployment of WLAN-based indoor localization. We have proposed an indoor localization method based on the nomadic APs, which shows good efficiency in providing localization services
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