Analysis of EMC between Equipment of Wireless Systems and Medical NB IoT Devices

The analysis of EMC between equipment of wireless systems (4G/5G user equipment of cellular communications as well as access points of radio local area network) and medical narrowband Internet-of-things (NB IoT) devices (utilizing LTE carrier in 452.5–457.5 MHz range for uplink and 462.5–467.5 MHz range for downlink) operating inside a hospital building is made. Computer simulation with the use of multipath radiowave propagation model and a 3D model of hospital premises is performed. The integrated interference margin involved as a criterion of EMC is calculated as a result of the analysis. It was concluded that the equipment of considered wireless systems can interfere with medical NB IoT devices (as well as NB IoT devices can interfere with receivers of these wireless systems) if emitters and receptors are located within the same room or in contiguous rooms. In order to reduce the levels of electromagnetic interference, recommendations are given.