A Lightweight Deep Learning Algorithm for WiFi-Based Identity Recognition

Yangjie Cao, Zhiyi Zhou, Chenxi Zhu, Pengsong Duan, Xianfu Chen, Jie Li

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)


WiFi-based identity recognition is predominant because of its noninvasive and ubiquitous advantages. However, existing approaches show slow training speed and limited applicability. In this paper, we propose a lightweight deep learning model, named as LightWeight WiFi-based Identification (LW-WiID), to address these technical challenges. LW-WiID reconstructs original data of channel state information into frequency energy graph, which contains not only the temporal feature of the gait but also the spatial feature among subcarriers, ensuring the accuracy of identity recognition. Furthermore, a novel Balloon mechanism is designed to achieve the lightweight. Through information integration crossing both layers and channels, the Balloon mechanism effectively reduces the number of model parameters. Experimental results demonstrate that LW-WiID achieves an accuracy of 99.7% on a 50-person gait dataset while the model size is compressed to 5.53% of the existing identity recognition approaches with the same accuracy.

Original languageEnglish
Pages (from-to)17449-17459
Number of pages11
JournalIEEE Internet of Things Journal
Issue number24
Early online date10 May 2021
Publication statusPublished - 15 Dec 2021
MoE publication typeA1 Journal article-refereed


  • Band-pass filters
  • channel state information
  • Deep learning
  • deep learning.
  • Feature extraction
  • Filtering
  • Identity recognition
  • Internet of Things
  • lightweight
  • Support vector machines
  • Wireless fidelity


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