csi-extractor

Before use

• Based on the Nexmon CSI Extractor (Raspberry Pi, Wi-Fi chip: bcm43455c0), this repository functions to save Channel State Information (CSI) data as a csv file for each TX MAC address
• Therefore, you can use this repo after installing the Nexmon CSI Extractor firmware and activating the monitor mode

Installation

• Clone this repo to Raspberry Pi to use as extractor and install the dependencies

pip3 install -r requirements.txt

Usage

• Run csi_extract.py with monitor mode enabled

sudo python3 csi_extract.py

• To stop collecting, type s on your keyboard
• Before starting CSI extraction, it is recommended to check whether the monitor mode is working well through a real time plot

sudo python3 csi_realTimeAmp.py
or
sudo python3 csi_realTimePhase.py

• If the real time plot does not work, there is a high possibility that there is a firmware installation error or monitor mode setting error
• The extractor configuration can be modified in ./cfg/config.py

Example of generated CSV file

• Number of columns: 2 + N_subcarriers

  • mac: TX MAC address
  • time: Time the CSI was extracted
  • N_subcarriers: Index of each subcarrier

• CSI values are stored in complex type