Modified Jaccard index analysis and adaptive feature selection for location fingerprinting with limited computational complexity

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2019-01-10 DOI:10.1080/17489725.2019.1577505
Caifa Zhou, A. Wieser
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引用次数: 8

Abstract

ABSTRACT We propose an approach for fingerprinting-based positioning which reduces the data requirements and computational complexity of the online positioning stage. It is based on a segmentation of the entire region of interest into subregions, identification of candidate subregions during the online-stage, and position estimation using a preselected subset of relevant features. The subregion selection uses a modified Jaccard which quantifies the similarity between the features observed by the user and those available within the reference fingerprint map. The adaptive feature selection is achieved using an adaptive forward-backward greedy search which determines a subset of features for each subregion, relevant with respect to a given fingerprinting-based positioning method. In an empirical study using signals of opportunity for fingerprinting the proposed subregion and feature selection reduce the processing time during the online-stage by a factor of about 10 while the positioning accuracy does not deteriorate significantly. In fact, in one of the two study cases, the 90th percentile of the circular error increased by 7.5% while in the other study case we even found a reduction of the corresponding circular error by 30%.
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有限计算复杂度的位置指纹的改进Jaccard索引分析和自适应特征选择
提出了一种基于指纹的定位方法,降低了在线定位阶段的数据要求和计算复杂度。它基于将整个感兴趣的区域分割成子区域,在在线阶段识别候选子区域,并使用预先选择的相关特征子集进行位置估计。子区域选择使用改进的Jaccard,量化用户观察到的特征与参考指纹图谱中可用特征之间的相似性。自适应特征选择是使用自适应前向后贪婪搜索来实现的,该搜索确定每个子区域的特征子集,这些特征子集与给定的基于指纹的定位方法相关。在一项使用机会信号进行指纹识别的实证研究中,所提出的子区域和特征选择将在线阶段的处理时间减少了约10倍,而定位精度没有显著下降。事实上,在其中一个研究案例中,第90百分位的圆误差增加了7.5%,而在另一个研究案例中,我们甚至发现相应的圆误差减少了30%。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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