Contactless Human Activity Recognition using Deep Learning with Flexible and Scalable Software Define Radio

Muhammad Zakir Khan, Jawad Ahmad, Wadii Boulila, Matthew Broadbent, Syed Aziz Shah, Anis Koubaa, Qammer H. Abbasi

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

1 Citation (Scopus)


Ambient computing is gaining popularity as a major technological advancement for the future. The modern era has witnessed a surge in the advancement in healthcare systems, with viable radio frequency solutions proposed for remote and unobtrusive human activity recognition (HAR). Specifically, this study investigates the use of Wi-Fi channel state information (CSI) as a novel method of ambient sensing that can be employed as a contactless means of recognizing human activity in indoor environments. These methods avoid additional costly hardware required for vision-based systems, which are privacy-intrusive, by (re)using Wi-Fi CSI for various safety and security applications. During an experiment utilizing universal software-defined radio (USRP) to collect CSI samples, it was observed that a subject engaged in six distinct activities, which included no activity, standing, sitting, and leaning forward, across different areas of the room. Additionally, more CSI samples were collected when the subject walked in two different directions. This study presents a Wi-Fi CSI-based HAR system that assesses and contrasts deep learning approaches, namely convolutional neural network (CNN), long short-term memory (LSTM), and hybrid (LSTM+CNN), employed for accurate activity recognition. The experimental results indicate that LSTM surpasses current models and achieves an average accuracy of 95.3% in multi-activity classification when compared to CNN and hybrid techniques. In the future, research needs to study the significance of resilience in diverse and dynamic environments to identify the activity of multiple users.
Original languageEnglish
Title of host publication2023 International Wireless Communications and Mobile Computing (IWCMC)
Number of pages6
ISBN (Electronic)979-8-3503-3339-8
ISBN (Print)979-8-3503-3340-4
Publication statusPublished - 21 Jul 2023
EventInternational Wireless Communications & Mobile Computing Conference - Marrakesh, Morocco
Duration: 19 Jun 202323 Jun 2023

Publication series

ISSN (Print)2376-6492
ISSN (Electronic)2376-6506


ConferenceInternational Wireless Communications & Mobile Computing Conference
Abbreviated titleIWCMC 2023
Internet address


  • Deep learning
  • Radio frequency
  • Wireless communication
  • Feature extraction
  • Data models
  • Sensors
  • Human activity recognition


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