  In this paper, the indoor dense space (IDS) channel at 28 GHz is
characterized through extensive Ray-Tracing (RT) simulations. We consider IDS
as a specific type of indoor environment with confined geometry and packed with
humans, such as aircraft cabins and train wagons. Based on RT simulations, we
characterize path loss, shadow fading, root-mean-square delay spread, Rician
K-factor, azimuth/elevation angular spread of arrival/departure considering
different RT simulation scenarios of the fuselage geometry, material, and human
presence. While the large-scale fading parameters are similar to the
state-of-the-art channel models, the small-scale fading parameters demonstrate
richer multipath scattering in IDS, resulting in poorer bit error rate
performance in comparison to the 3GPP indoor channel model.
