CSI-based sensing refers to the use of Channel State Information extracted from WiFi signals to detect, monitor, and interpret physical phenomena — most notably human presence, movement, gestures, and activities — by analyzing how multipath propagation characteristics such as amplitude and phase are perturbed by environmental changes. It matters for the field because CSI provides far richer spatial and frequency-domain detail than simpler metrics like RSSI, enabling more accurate and fine-grained passive sensing without requiring subjects to wear dedicated devices. Key variants include passive sensing (where existing WiFi infrastructure captures CSI without dedicated sensing transmissions), active or standardized sensing as formalized in IEEE 802.11bf (which defines explicit sensing measurement procedures between transmitting and receiving stations), and learning-based approaches that pair raw CSI data with deep learning architectures such as CNNs, RNNs, and transformers to handle the complexity and variability of real-world channels.
Source Papers
- A Robust CSI-Based Scatterer Geometric Reconstruction Method for 6G ISAC System ↗ — A Robust CSI-Based Scatterer Geometric Reconstruction Method
- An Overview on IEEE 802.11bf: WLAN Sensing ↗ — An Overview on IEEE 802.11bf: WLAN Sensing
- Channel State Information from Pure Communication to Sense and Track Human Motion: A Survey ↗ — Channel State Information from Pure Communication to Sense a
- Device-Free Passive Identity Identification via WiFi Signals ↗ — Device-Free Passive Identity Identification via WiFi Signals
- Efficient machine learning for Wi-Fi CSI-based human activity recognition using fast Monte Carlo based feature extraction ↗ — Efficient machine learning for Wi-Fi CSI-based human activit
- Guiding Wi-Fi Sensor Placement for Enhanced CSI-Based Sensing in Stationary Crowd Counting ↗ — Guiding Wi-Fi Sensor Placement for Enhanced CSI-Based Sensin
- IEEE 802.11bf WLAN Sensing Procedure: Enabling the Widespread Adoption of WiFi Sensing ↗ — IEEE 802.11bf WLAN Sensing Procedure: Enabling the Widesprea
- RSSI-Assisted CSI-Based Passenger Counting with Multiple Wi-Fi Receivers ↗ — RSSI-Assisted CSI-Based Passenger Counting with Multiple Wi-
- Tool release ↗ — Tool release
- WiFi-Based Human Sensing With Deep Learning: Recent Advances, Challenges, and Opportunities ↗ — WiFi-Based Human Sensing With Deep Learning: Recent Advances