Data Augmentation and Dense-LSTM for Human Activity Recognition Using WiFi Signal

Zhang, Jin, Wu, Fuxiang, Wei, Bo, Zhang, Qieshi, Huang, Hui, Shah, Syed W. and Cheng, Jun (2021) Data Augmentation and Dense-LSTM for Human Activity Recognition Using WiFi Signal. IEEE Internet of Things Journal, 8 (6). pp. 4628-4641. ISSN 2372-2541

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Recent research has devoted significant efforts on the utilization of WiFi signals to recognize various human activities. An individual’s limb motions in the WiFi coverage area could interfere with wireless signal propagation, that manifested as unique patterns for activity recognition. Existing approaches though yielding reasonable performance in certain cases, are ignorant of two major challenges. The performed activities of the individual normally have inconsistent speed in different situations and time. Besides that the wireless signal reflected by human bodies normally carries substantial information that is specific to that subject. The activity recognition model trained on a certain individual may not work well when being applied to predict another individual’s activities. Since only recording activities of limited subjects in a certain speed and scale, recent works commonly have a moderate amount of activity data for training the recognition model. The small-size data could often incur the overfitting issue that negative affect the traditional classification model. To address these challenges, we propose a WiFi-based human activity recognition system that synthesizes variant activities data through eight channel state information (CSI) transformation methods to mitigate the impact of activity inconsistency and subject-specific issues, and also design a novel deep-learning model that caters to the small-size WiFi activity data. We conduct extensive experiments and show synthetic data improve performance by up to 34.6% and our system achieves around 90% of accuracy with well robustness in adapting to small-size CSI data.

Item Type: Article
Uncontrolled Keywords: Channel state information (CSI), data augmentation, human activity recognition, neural network, WiFi
Subjects: G500 Information Systems
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User: John Coen
Date Deposited: 10 Mar 2021 14:01
Last Modified: 31 Jul 2021 15:21

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