Affiliations: [a] Department of Electrical Engineering, Yuan Ze University, Taoyuan, Taiwan
| [b] School of Mechanical and Electrical Engineering, Sanming University, Fujian, China
Correspondence:
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Corresponding author. Chien-Cheng Lee, Department of Electrical Engineering, Yuan Ze University, Taoyuan 320, Taiwan. E-mail: cclee@saturn.yzu.edu.tw.
Abstract: This paper proposes a Wi-Fi-based indoor human detection system using a deep convolutional neural network. The system detects different human states in various situations, including different environments and propagation paths. The main improvements proposed by the system is that there is no cameras overhead and no sensors are mounted. This system captures useful amplitude information from the channel state information and converts this information into an image-like two-dimensional matrix. Next, the two-dimensional matrix is used as an input to a deep convolutional neural network (CNN) to distinguish human states. In this work, a deep residual network (ResNet) architecture is used to perform human state classification with hierarchical topological feature extraction. Several combinations of datasets for different environments and propagation paths are used in this study. ResNet’s powerful inference simplifies feature extraction and improves the accuracy of human state classification. The experimental results show that the fine-tuned ResNet-18 model has good performance in indoor human detection, including people not present, people still, and people moving. Compared with traditional machine learning using handcrafted features, this method is simple and effective.
Keywords: Human movement detection, Wi-Fi, CNN, ResNet, channel state information
