Abstract
This paper addresses the important issue of position estimation in indoor environments. Starting point of the research is positioning techniques that exploit the knowledge of power levels of RF signals from multiple 802.11 WLAN APs (Access Points). In particular, the key idea in this paper is to enhance the performance of a WLAN fingerprinting approach by coupling it to a RFID-based procedure. WLAN and RFID technologies are synergistically used to provide a platform for a more performing positioning process, in which the very strong identification capabilities of the RFID technology allow to increase the accuracy of positioning systems via WLAN fingerprinting. The algorithm performance is assessed through general and repeatable experimental campaigns, during which the main algorithm parameters are dimensioned. The results testify both to the feasibility of the solution and to its higher accuracy (attainable at very reduced costs) compared to traditional positioning techniques.
Highlights
The wireless telecommunications market has increased its interest towards so-called “location-based” applications, which are proposed to the end-user attention as the most promising response to their need of personalized communications in fields such as Infomobility, mobile entertainment and gaming, Intelligent Transportation Systems, assisted driving, and so forth
The good level of performance significantly improves when thickening the grid of reference points and increasing the number of WLAN Access Points (APs), as Figure 4 shows
In this paper we investigated the feasibility of a new approach to positioning, which exploits WLAN and Radio Frequency IDentification (RFID) Integration to enhance the performance of a localization algorithm in indoor scenarios
Summary
The wireless telecommunications market has increased its interest towards so-called “location-based” applications, which are proposed to the end-user attention as the most promising response to their need of personalized communications in fields such as Infomobility, mobile entertainment and gaming, Intelligent Transportation Systems, assisted driving, and so forth. In order to achieve accurate position estimation inside the buildings, several solutions have been proposed, which differ from each other in the used technology, positioning accuracy, offered coverage, frequency of updates, and costs of installation and maintenance As it will be shown in the following, several comparative studies on competing positioning systems are available from the literature; most of them are based on Radio Frequency (RF) technologies (e.g., Wi-Fi, Bluetooth) [2,3,4,5,6,7]. Potentials and limitations of the proposed hybrid WLAN-RFID positioning technique will be highlighted, and its effectiveness validated by a comprehensive measurement campaign This latter will testify that the emerging synergies between a typical communication system (like Wi-Fi) and a typical identification technology (like RFID) are able to implement low complexity solutions to enhance performance of location sensing mechanism.
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