Wireless Channel Measurement and Modeling in Industrial Environments

The Industrial Internet of Things (IIoT), a typical use case of the Internet of Things, has been a great prospect for development in the near future. In the developing fifth generation mobile communications, the IIoT is an extremely important application case. In this paper, the channel propagation properties are researched and modeled based on the measurement data in an automobile welding factory. The results of the path loss exponent values are around 2.5 and 3.3 in line of sight propagation (LOS) and obstructed line of sight (OLOS) propagation scenarios, respectively. In LOS and OLOS propagation scenarios, K factor values are around 5 dB and 4 dB, respectively. Meanwhile, in these two propagation environment, the amount of multipath components (MPCs) and the root mean squared (RMS) delay are extracted and compared. Particularly, a special case is considered that the sensor/actuator is placed inside the metallic body of a machine, which affects the path loss exponent values and K factor values. These measurement results are of great significance to the development of IIoT