Wi-Fi Based Multi Target Device-Free Sensing Using Joint TX-RX Beamforming

对于fy2021，我们开发了一个能够4x4多输入多输出（MIMO）以及具有2个用户的多用户平台，该平台将用于实施拟议的多目标WiFi传感项目。该平台使用多个ADRV9009 FGPA和通过以太网连接的ZCU102 RF子板进行板对板通信。使用该平台的传输和接收是通过运行Matlab并连接到FPGA板以太网络的主机PC完成的。使用该平台，我们测试了其执行实时WiFi传感的能力。目前，测试是在单一发射装置和单一接收装置上完成的。通过这种设置，可以准确地感知单个WiFi目标。在MIMO处理中，我们使用来自接收机的多根天线，测量MIMO信道特征值的变化，以检测人体运动。人类的检测是使用Matlab工具箱提供的常规人工智能辅助系统完成的。初步结果表明，利用所开发的平台可以很容易地对单个WiFi目标进行传感。未来，该项目的目标是提供一种改进的系统，该系统允许Wi-Fi感应多个目标，其精度与单个目标相似。

For the F.Y. 2021, we have developed a platform capable of 4x4 Multiple Input Multiple Output (MIMO) as well as Multi-user with 2 users which will be used to implement the proposed Multi-target WiFi sensing project . The platform was built using multiple ADRV9009 FGPA with a ZCU102 RF daughterboards connected via Ethernet for board to board communication. Transmissions and receptions using the platform is done using a host PC running Matlab and connected to the FPGA board ethernet network.Using the platform, we have tested its capability to perform real time WiFi sensing. Currently, the tests were done with a single transmitting device and a single receiving device. With this setup, a single WiFi target is sensed accurately. Using MIMO processing, we used multiple antennas from the receiver and measure the changes in the eigenvalues of the MIMO channel in order to detect human beings movement. The detection of the human beings were done using conventional artificial intelligence aided systems provided by a Matlab Toolbox. Our preliminary results show that single WiFi target can be easily sensed using the developed platform. In the future, the goal of this project is to provide a modified system that allows Wi-Fi sensing of multiple targets with similar accuracy as the single target one.