System Analysis of Electromagnetic Environment Created by Radiating 4G/5G User Equipment Inside Buildings

Abstract

The technique for estimating an electromagnetic background created by radiating user equipment of mobile communications in buildings is developed. It is based on system analysis of statistical regularities of electromagnetic environment in premises at different radiation power and indoor spatial density of sources, using the known empirical models of radio wave propagation in buildings. Results of analysis are the probability distribution density and mathematical expectation of power flux densities of electromagnetic fields generated by their sources from various parts of the building's interior space: from the near zone with radio wave propagation similar to free space conditions; and from the far zone, for which, along with attenuation of radio waves due to internal obstacles (walls, ceilings, etc.), a “quasi-waveguide” propagation of radio waves along corridors and industrial premises is also possible in certain directions. An essential regularities in the creation of statistical characteristics of the ensemble of these electromagnetic fields have also been discovered and described. Results obtained can be used at EMC analysis of systems using corresponding frequency bands on a primary and secondary basis and at estimation of electromagnetic safety of population at the full-scale implementation of 4G/5G wireless services.