Nexmon CSI is an open-source firmware patching framework developed for Broadcom and Cypress Wi-Fi chipsets (commonly found in devices such as the Raspberry Pi and Nexus smartphones) that enables extraction of raw Channel State Information (CSI) from commercial off-the-shelf hardware, including support for wide-channel configurations such as 80 MHz bandwidth under the IEEE 802.11ac standard. It matters significantly for the Wi-Fi sensing field because it democratizes access to fine-grained CSI data without requiring specialized or proprietary hardware, lowering the barrier to reproducible and large-scale sensing research. Key variants and extensions include support for different chipset generations (e.g., BCM4339, BCM4358, BCM43455c0) and configurations that vary in the number of extractable subcarriers, spatial streams, and supported bandwidths, with the 80 MHz variant being particularly notable for providing up to 256 subcarriers per packet and thus enabling higher-resolution sensing compared to earlier 20 or 40 MHz implementations.
Source Papers
- A CSI Dataset for Wireless Human Sensing on 80 MHz Wi-Fi Channels ↗ — A CSI Dataset for Wireless Human Sensing on 80 MHz Wi-Fi Cha
- A Survey on Wi-Fi Sensing Generalizability: Taxonomy, Techniques, Datasets, and Future Research Prospects ↗ — A Survey on Wi-Fi Sensing Generalizability: Taxonomy, Techni
- A survey on CSI-based Wi-Fi sensing datasets and models with a focus on reproducibility ↗ — A survey on CSI-based Wi-Fi sensing datasets and models with
- CSI-Based NTC Using Ambient WiFi: Channel Selection, Topology Control and Traffic Interference ↗ — CSI-Based NTC Using Ambient WiFi: Channel Selection, Topolog
- Deep Learning-Enhanced Human Sensing with Channel State Information: A Survey ↗ — Deep Learning-Enhanced Human Sensing with Channel State Info
- Exposing the CSI: A Systematic Investigation of CSI-based Wi-Fi Sensing Capabilities and Limitations ↗ — Exposing the CSI: A Systematic Investigation of CSI-based Wi
- RSSI-Assisted CSI-Based Passenger Counting with Multiple Wi-Fi Receivers ↗ — RSSI-Assisted CSI-Based Passenger Counting with Multiple Wi-