Multiple Participants’ Discrete Activity Recognition in a Well-Controlled Environment Using Universal Software Radio Peripheral Wireless Sensing

Umer Saeed, Syed Yaseen Shah, Syed Aziz Shah, Haipeng Liu, Abdullah Alhumaidi Alotaibi, Turke Althobaiti, Naeem Ramzan, Sana Ullah Jan, Ahmad Jawad, Qammer H. Abbasi

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Abstract

Wireless sensing is the utmost cutting-edge way of monitoring different health-related activities and, concurrently, preserving most of the privacy of individuals. To meet future needs, multi-subject activity monitoring is in demand, whether it is for smart care centres or homes. In this paper, a smart monitoring system for different human activities is proposed based on radio-frequency sensing integrated with ensemble machine learning models. The ensemble technique can recognise a wide range of activity based on alterations in the wireless signal’s Channel State Information (CSI). The proposed system operates at 3.75 GHz, and up to four subjects participated in the experimental study in order to acquire data on sixteen distinct daily living activities: sitting, standing, and walking. The proposed methodology merges subject count and performed activities, resulting in occupancy count and activity performed being recognised at the same time. To capture alterations owing to concurrent multi-subject motions, the CSI amplitudes collected from 51 subcarriers of the wireless signals were processed and merged. To distinguish multi-subject activity, a machine learning model based on an ensemble learning technique was designed and trained using the acquired CSI data. For maximum activity classes, the proposed approach attained a high average accuracy of up to 98%. The presented system has the ability to fulfil prospective health activity monitoring demands and is a viable solution towards well-being tracking.
Original languageEnglish
Article number809
Number of pages18
JournalSensors
Volume22
Issue number3
DOIs
Publication statusPublished - 21 Jan 2022

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords

  • USRP
  • RF sensing
  • software-defined radio
  • multi-subject monitoring
  • smart healthcare
  • ensemble learning
  • Walking
  • Prospective Studies
  • Humans
  • Human Activities
  • Software
  • Environment, Controlled

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