FingerDraw: sub-wavelength level finger motion tracking with WiFi signals

Dan Wu, Ruiyang Gao, Youwei Zeng, Jinyi Liu, Leye Wang, Tao Gu, Daqing Zhang

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


This paper explores the possibility of tracking finger drawings in the air leveraging WiFi signals from commodity devices. Prior solutions typically require user to hold a wireless transmitter, or need proprietary wireless hardware. They can only recognize a small set of pre-defined hand gestures. This paper introduces FingerDraw, the first sub-wavelength level finger motion tracking system using commodity WiFi devices, without attaching any sensor to finger. FingerDraw can reconstruct finger drawing trajectory such as digits, alphabets, and symbols with the setting of one WiFi transmitter and two WiFi receivers. It uses a two-antenna receiver to sense the sub-wavelength scale displacement of finger motion in each direction. The theoretical underpinning of FingerDraw is our proposed CSI-quotient model, which uses the channel quotient between two antennas of the receiver to cancel out the noise in CSI amplitude and the random offsets in CSI phase, and quantifies the correlation between CSI value dynamics and object displacement. This channel quotient is sensitive to and enables us to detect small changes in In-phase and Quadrature parts of channel state information due to finger movement. Our experimental results show that the overall median tracking accuracy is 1.27 cm, and the recognition of drawing ten digits in the air achieves an average accuracy of over 93.0%.

Original languageEnglish
Article number31
Number of pages27
JournalACM Proceedings on Interactive, Mobile, Wearable and Ubiquitous Technologies
Issue number1
Publication statusPublished - Mar 2020
Externally publishedYes


  • Channel Quotient
  • Channel state information (CSI)
  • Finger-draw gesture
  • WiFi


Dive into the research topics of 'FingerDraw: sub-wavelength level finger motion tracking with WiFi signals'. Together they form a unique fingerprint.

Cite this