Accurate Indoor Location Estimation by Incorporating the Importance of Access Points in Wireless Local Area Networks
Date Issued
2009
Date
2009
Author(s)
Huang, Hao-Ru
Abstract
This study focuses on indoor localization in Wireless Local Area Networks (WLANs). e investigate the unequal contribution of each access point (AP) on location estimation.he main contribution is two parts. irst, a novel mechanism is proposed to measure the degrees of the AP importance. he importance of each AP is quantified by the signal discrimination between distinct locations. e utilize such numerical relevancies to select important APs to avoid unnecessary calculations. o select the important AP means place the AP in the discriminative positions.ur method can efficiently apply to AP placement.econd, the importance is further embedded into our positioning system. e provide a weighted kernel function where the effect of APs is differentiated. hat is, the larger weights are assigned to the more important APs. oreover, we develop a quasi entropy function to avoid an abrupt change on the weights.ur positioning system is developed in a real-world WLAN environment, where the realistic measurement of receive signal strength (RSS) is collected. xperimental results show that the positioning accuracy is significantly improved by taking theifferent importance into consideration.
Subjects
indoor localization
wireless local area networks
AP selection
location fingerprinting
AP placement
Type
thesis
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