Performance Analysis of Wi-Fi Indoor Localization with Channel State Information

Performance Analysis of Wi-Fi Indoor Localization with Channel State Information
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基于信道状态信息的 Wi-Fi 室内定位性能分析

DOI:
10.1109/tmc.2018.2868680
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发表时间:
2019-08
影响因子:
7.9
通讯作者:
Wang Xinbing
Wang Xinbing
中科院分区:
计算机科学2区
文献类型:
--
作者:
Tian Xiaohua;Zhu Sujie;Xiong Sijie;Jiang Binyao;Yang Yucheng;Wang Xinbing

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最近提出的Wi-Fi室内定位系统利用从接收信号导出的信道状态信息(CSI)实现令人钦佩的精度。本文提出了一种信息理论分析,在接收波形的水平,探索的基本限制的方法。特别是,我们执行频域Cram$\acute{e}$e ′ r-Rao界(CRB)分析与CSI的位置估计。我们的分析解决了高秩Fisher信息矩阵的挑战,并建立了内在的连接参数估计本地化和接收到的波形信息与CSI检索工具包观察。我们还分析了发射机和接收机之间的干扰对CSI方法性能界的影响。此外,我们揭示了洞察CSI定位系统的设计。特别是,我们表明,CSI的方法提出了不同的性能定位目标在不同的距离和方向相对于CSI检索锚点(AP),和AP天线的几何分布可能会从根本上影响定位性能。综合实验结果证明,我们的理论分析。
Recently proposed Wi-Fi indoor localization systems utilizing channel state information (CSI) derived from the received signal achieve admirable accuracy. This paper presents an information-theoretical analysis in the received waveform level to explore the fundamental limits of the approach. In particular, we perform frequency domain Cram$\acute{e}$e´r-Rao bound (CRB) analysis for location estimation with CSI. Our analysis resolves the high-rank Fisher information matrix challenge, and establishes intrinsic connection between parameters to be estimated for localization and the received waveform information observable with the CSI retrieving toolkit. We also analyze the influence of the asynchronization between the transmitter and the receiver to the performance bound of the CSI approach. Moreover, we shed light on the insight into the design of the CSI localization systems. In particular, we show that the CSI approach presents varying performance for localizing targets in different distances and directions with respect to the CSI retrieving anchor point (AP), and the geometric distribution of AP antennas could fundamentally influence the localization performance. Comprehensive experimental results are demonstrated to validate our theoretical analysis.
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