Doppler Sensing Using WiFi Round-Trip Channel State Information

Fangzhan Shi, Wenda Li, Chong Tang, Paul Brennan, Kevin Chetty

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
39 Downloads (Pure)


This paper presents a wireless Doppler sensing system using WiFi round-trip channel state information (RTCSI), which is implemented using the channel state information (CSI) from the Raspberry Pi CM4 onboard WiFi chip and a customized WiFi protocol. Utilizing the CSI phase in WiFi sensing is challenging as hardware asynchronization introduces significant phase errors. Similar to WiFi round-trip time (RTT) ranging, RTCSI was proposed to cancel the adverse effect of asynchronization through two-way communication. However, previous work mainly focuses on measuring RTCSI over frequency (different WiFi channels) to simulate a wide-band ranging. In this work, RTCSI is measured over time and a Doppler sensing prototype is built to detect a moving target in the wireless channel. Our findings show that this RTCSI-based Doppler sensing system is sensitive and effective in the real world. Moreover, it may be integrated with other techniques further to improve the performance in joint communications and sensing.

Original languageEnglish
Title of host publication2023 IEEE Wireless Communications and Networking Conference, WCNC 2023
Subtitle of host publicationProceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781665491228
ISBN (Print)9781665491235
Publication statusPublished - 12 Mar 2023
Event2023 IEEE Wireless Communications and Networking Conference - Scottish Event Campus, Glasgow, United Kingdom
Duration: 26 Mar 202329 Mar 2023

Publication series

ISSN (Print)1525-3511


Conference2023 IEEE Wireless Communications and Networking Conference
Abbreviated titleWCNC 2023
Country/TerritoryUnited Kingdom
Internet address


  • Channel State Information
  • Joint Communication and Sensing
  • WiFi Doppler Sensing

ASJC Scopus subject areas

  • General Engineering


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