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A Material Identification Approach Based on Wi-Fi Signal

Chao Li1, Fan Li1,2, Wei Du3, Lihua Yin1,*, Bin Wang4, Chonghua Wang5, Tianjie Luo1

1 Cyberspace Institute of Advanced Technology, Guangzhou University, Guangzhou, 510700, China
2 PCL Research Center of Cyberspace Security, Peng Cheng Laboratory, Shenzhen, 518052, China
3 Department of Computer Science and Computer Engineering, University of Arkansas, Fayetteville, 72701, USA
4 College of Electrical Engineering, Zhejiang University, Hangzhou, 310058, China
5 China Industrial Control Systems Cyber Emergency Response Team, Beijing, 100040, China

* Corresponding Author: Lihua Yin. Email: email

Computers, Materials & Continua 2021, 69(3), 3383-3397.


Material identification is a technology that can help to identify the type of target material. Existing approaches depend on expensive instruments, complicated pre-treatments and professional users. It is difficult to find a substantial yet effective material identification method to meet the daily use demands. In this paper, we introduce a Wi-Fi-signal based material identification approach by measuring the amplitude ratio and phase difference as the key features in the material classifier, which can significantly reduce the cost and guarantee a high level accuracy. In practical measurement of Wi-Fi based material identification, these two features are commonly interrupted by the software/hardware noise of the channel state information (CSI). To eliminate the inherent noise of CSI, we design a denoising method based on the antenna array of the commercial off-the-shelf (COTS) Wi-Fi device. After that, the amplitude ratios and phase differences can be more stably utilized to classify the materials. We implement our system and evaluate its ability to identify materials in indoor environment. The result shows that our system can identify 10 commonly seen liquids with an average accuracy of 98.8%. It can also identify similar liquids with an overall accuracy higher than 95%, such as various concentrations of salt water.


Cite This Article

APA Style
Li, C., Li, F., Du, W., Yin, L., Wang, B. et al. (2021). A material identification approach based on wi-fi signal. Computers, Materials & Continua, 69(3), 3383-3397.
Vancouver Style
Li C, Li F, Du W, Yin L, Wang B, Wang C, et al. A material identification approach based on wi-fi signal. Comput Mater Contin. 2021;69(3):3383-3397
IEEE Style
C. Li et al., "A Material Identification Approach Based on Wi-Fi Signal," Comput. Mater. Contin., vol. 69, no. 3, pp. 3383-3397. 2021.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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