Device-Free Passive Identity Identification via WiFi Signals
AbstractDevice-free passive identity identification attracts much attention in recent years, and it is a representative application in sensorless sensing. It can be used in many applications such as intrusion detection and smart building. Previous studies show the sensing potential of WiFi signals in a device-free passive manner. It is confirmed that human’s gait is unique from each other similar to fingerprint and iris. However, the identification accuracy of existing approaches is not satisfactory in practice. In this paper, we present Wii, a device-free WiFi-based Identity Identification approach utilizing human’s gait based on Channel State Information (CSI) of WiFi signals. Principle Component Analysis (PCA) and low pass filter are applied to remove the noises in the signals. We then extract several entities’ gait features from both time and frequency domain, and select the most effective features according to information gain. Based on these features, Wii realizes stranger recognition through Gaussian Mixture Model (GMM) and identity identification through a Support Vector Machine (SVM) with Radial Basis Function (RBF) kernel. It is implemented using commercial WiFi devices and evaluated on a dataset with more than 1500 gait instances collected from eight subjects walking in a room. The results indicate that Wii can effectively recognize strangers and can achieves high identification accuracy with low computational cost. As a result, Wii has the potential to work in typical home security systems. View Full-Text
Share & Cite This Article
Lv, J.; Yang, W.; Man, D. Device-Free Passive Identity Identification via WiFi Signals. Sensors 2017, 17, 2520.
Lv J, Yang W, Man D. Device-Free Passive Identity Identification via WiFi Signals. Sensors. 2017; 17(11):2520.Chicago/Turabian Style
Lv, Jiguang; Yang, Wu; Man, Dapeng. 2017. "Device-Free Passive Identity Identification via WiFi Signals." Sensors 17, no. 11: 2520.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.