The dataset serves to investigate the impact of human body blockage on WiFi channel quality information (CQI) obtained by a multiple input multiple output device. The experimental activities have been conducted inside an indoor lab environment having size 6 × 4 sqm.

As shown in the figure above, a single MIMO WiFi device is acting as TX and being equipped with 3 antennas, the RX is also equipped with 3 antennas. Distance between the TX and RX is 210 cm. The TX is located 61 cm above ground. The RX is located 74 cm above ground. Devices are deployed in the monitored area to capture the target (human body) presence and its activity inside the room environment.

Funding

Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or European Innovation Council and SMEs Executive Agency (EISMEA). Neither the European Union nor the granting authority can be held responsible for them. Grant Agreement No: 101099491. Project HOLDEN.

WiFi devices and Channel Quality Information

All MIMO WiFi devices are configured in monitor mode and working in the 5.32 GHz band (i.e., WiFi band 2, channel 64, OFDM symbol sub-carrier spacing 312.5 kHz and nominal bandwidth equal to 20 MHz). The monitor mode allows the receivers to observe the CSI values on the considered channel without explicit IP handshaking procedures. The TX device is programmed to inject (i.e., transmit) custom IEEE 802.11n PHY Protocol Data Units (PPDU) structured as standard High-Throughput (HT) greenfield WiFi format including preamble, MAC addresses, header and payload: injected frames are sent at regular time intervals of 10 ms. In our tests, the TX device acts as an access point while the RX devices are collecting and measuring CQI reports. For each transmitter-receiver pair we obtain the CQI reports of 30 pilot SUBCARRIERS. The adopted chipset is the Intel Wireless Link 5300 working as a MIMO-OFDM baseband modem. CQI reports are organized into several CSV files as described in the following. Each CSV file tracks the CQI data set, organized by frequency, antenna and time frames.

Folders and CSV files

Each folder corresponds to a different body activity. In particular:
1) CQI_dB.csv contains dB converted power measurements,
2) CQI_i.csv contains the corresponding imaginary components of the channel state information after phase unwrapping
3) CQI_r.csv contains the corresponding real components of the channel state information after phase unwrapping

File and columns descriptions

Each CSV file has dimension 270 x T,
The T columns represent the (variable) number of consecutive WiFi frames (time series).
The 270 rows represent the CQI samples obtained for each WiFi frame. Rows i identify the TX antenna, the RX antenna and the specific pilot SUBCARRIER and are organized as follows:

** Notebook and supporting code **

The attached code provides an example for the evaluation of MUSIC spectrum (see figure below)