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A Device-Free Indoor Localization Method Using CSI with Wi-Fi Signals.

Xiaochao Dang^1,2, Xuhao Tang¹, Zhanjun Hao^3,4

¹College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, China.

Sensors (Basel, Switzerland)

|July 26, 2019

Summary

This summary is machine-generated.

This study introduces a new passive indoor positioning system using Channel State Information (CSI). The method achieves high accuracy and stability, offering decimeter-level positioning for wireless communication.

Keywords:

channel state information device-free indoor positioning wavelet domain denoising wireless

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Area of Science:

Wireless Communication and Signal Processing
Indoor Positioning Systems

Background:

Increasing demand for location-based services drives advancements in wireless communication technology.
Passive indoor positioning is gaining attention due to its non-intrusive nature.
Existing methods struggle with environmental vulnerabilities and limited fingerprint accuracy.

Purpose of the Study:

To propose a novel passive indoor positioning method utilizing Channel State Information (CSI).
To enhance positioning accuracy and stability compared to existing techniques.

Main Methods:

Collected CSI amplitude data processed using Wavelet Domain Denoising (WDD).
CSI phase information was unwound and linearly transformed during the offline phase.
Processed amplitude and phase data formed the fingerprint database, correlated with reference points.

Main Results:

The proposed CSI-based method demonstrated lower positioning error in experimental analyses.
The system exhibited higher stability compared to similar indoor positioning methods.
Achieved decimeter-level positioning accuracy in two distinct environments.

Conclusions:

The CSI-based passive indoor positioning method offers a significant improvement in accuracy and stability.
Wavelet Domain Denoising and phase processing effectively enhance fingerprint data for precise localization.
The method provides a viable solution for reliable decimeter-level indoor positioning.