Analysis of radio wave propagation at millimeter-wave band in tunnels for 5G communications

摘要

In this paper, the simulation and measurement results at millimeter-wave frequency inside three different tunnels are presented. Through the simulation results the impacts of tunnel cross sectional shape and dimension on path loss and delay spread are analyzed. In addition, the antenna radiation pattern, its orientation and wall roughness in small railway tunnel are studied. The results are validated using preliminary measurement carried out in old railway tunnel.