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Towards Millimeter-scale Contactless Sensing with Wi-Fi/4G/5G Signals: Theory and Applications
Speaker (s):
ZHANG Daqing
Professor
Département Réseaux et Services Multimédia Mobile
Institut Polytechnique de Paris
| Date: Time: Venue: | | 27 August 2025, Wednesday 2:00pm – 3:00pm School of Computing &
Information Systems 1 (SCIS 1)
Level 2, Seminar Room 2-4
Singapore Management University
80 Stamford Road
Singapore 178902 Please register by 26 August 2025 We look forward to seeing you at this research seminar. 
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About the Talk WiFi/4G/5G based wireless sensing has attracted a lot of attention from both academia and industry in the last decade. However, very few work attempted to explore the fundamental sensing theory and answer fundamental questions such as the sensing boundary and sensing quality of WiFi/4G/5G signals. In this talk, I will first introduce the Fresnel zone model as a generic theoretic basis for device-free and contactless human sensing with WiFi/4G/5G signals, revealing the relationship among the received CSI signal, the distance between the two transceivers, the location and heading of the sensing target with respect to the transceivers, and the environment. Then we propose to define the Sensing Signal to Noise Ratio (SSNR) as a new metric to inform the sensing limit, sensing boundary and sensing signal quality of WiFi/4G/5G-based human sensing systems. Building on the Fresnel zone model and SSNR metric, millimeter-scale human activity sensing could be achieved. I will show a series of WiFi sensing applications to demonstrate the power of the proposed theory and techniques.
About the Speaker Daqing Zhang is a Chair Professor at IP Paris and Peking University. His research interests include ubiquitous computing, mobile computing, big data analytics and AIoT. He has published more than 300 technical papers in leading conferences and journals, with a citation of over 33000 and H-index of 94. He developed the OWL-based context model and Fresnel Zone-based wireless sensing theory, which are widely used by pervasive computing, mobile computing and service computing communities. He was the winner of the Ten Years CoMoRea Impact Paper Award at IEEE PerCom 2013，and the Ten Years Most Influential Paper Award at IEEE UIC 2019 and FCS 2023, the Best Paper Award Runner-up at ACM MobiCom 2022, the Distinguished Paper Award of IMWUT (UbiComp 2021), etc.. He is now in the editorial board of ACM IMWUT, ACM TOSN and CCF TPCI. Daqing Zhang is a Fellow of IEEE and Member of Academy of Europe. |
