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第十一届中国卫星导航年会

作者： Chengxi Zeng Zhongliang Deng Jingyao Wang Yao Zhang Zhixia Xi Beijing University of Posts and Telecommunications China Academy of information and communication Technology Beijing Automotive Technology Center

With the improvement of location technology,the demand for location-based application services *** commonly used global navigation satellite system has a poor performance in the center of the ci

关键词： fingerprint location ap selection information theory self-adaptive

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Spatially localized and joint access point selection for Wi-Fi indoor positioning

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Journal of Harbin Institute of Technology(New Series) 2012年第6期19卷 27-33页

作者：邓志安马琳徐玉滨 Communication Research Center Harbin Institute of Technology

Wi-Fi indoor positioning system has received increasing interest in pervasive computing applications due to its low cost and satisfactory accuracy. To obtain high positioning accuracy based on source limited devices, various ap selection strategies have been proposed to select the most discriminant aps for positioning. In this paper, we propose a spatially localized ap selection method based on joint location information gain. In contrast to traditional ap selection methods which measure the discriminant ability of aps independently, we consider choosing aps jointly. By considering the correlation of the discriminant ability between different aps, more accurate measure of the discriminant ability of aps can be taken. Furthermore, since the optimal ap selection solution varies spatially, we incorporate a location clustering method to localize ap selection and subsequent positioning process. Finally, support vector regression (SVR) algorithm is combined to estimate the location. Experiments are carried in a realistic Wi-Fi indoor environment. Experimental results show that, by using the localized joint ap selection strategy, the proposed positioning method achieves a high-level accuracy while reducing the energy consumption on client devices significantly.

关键词： Wi-Fi ap selection clustering analysis support vector regression indoor positioning

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维普期刊数据库

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An ap handover scheme using vehicular Wi-Fi connectivity

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Journal of Harbin Institute of Technology(New Series) 2012年第5期19卷 80-86页

作者：牛建伟戴彬杜国平童超 School of Computer Science and Engineering Beihang University

With the rapid evolution of Wi-Fi technology and the dramatic increase in Wi-Fi coverage, it has become lot more convenient to transfer data by using roadside ap (Access Point). Previous research has proved the feasibility of using vehicular Wi-Fi infrastructure to deliver data packages. However, the issue of optimization of the ap's selection method under different mobility patterns is still open to research. To tackle this issue, this paper proposes an ap selection scheme that maximizes the potential connection time by using Received Signal Strength Indication (RSSI) to predict the duration of future connection between the specific vehicle and aps. Choosing aps with maximum connection duration guarantees the reduction of disconnection rate and packet loss, while improving the stability of the data traffic. The experimental results show that our strategy improves the average connection time and reduces the number of handovers, thereby significantly enhancing communication quality.

关键词： vehicular Wi-Fi RSSI connection duration ap selection

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维普期刊数据库

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