Propagation Characteristics Estimation for Indoor 5G Wireless Environment Including Human Body Shielding Using Parallel FDTD Method

his study aims to investigate the propagation characteristics of private 5th-generation mobile communication system (5G) frequency bands, including the human body shadowing in indoor environments. We conducted a large-scale three-dimensional numerical analysis using the finite-difference time-domain (FDTD) method to model an indoor propagation environment containing humans and evaluate the propagation loss characteristics. The precise electric field distribution excited by a 5G transmitting antenna, which is used as the private-5 G access point, was calculated. Shadowing and scattering effects due to a real human body were evaluated in the full-wave simulations. Our simulation results show that the effect of reflected waves is significant for indoor radio propagation, and multipath fading increases significantly even though the loss due to human shielding is ameliorated.