SUMMARYDelay profiles at 70 GHz were acquired in a moving train. In measurement with the transmitting and receiving antennas facing with each other, it was found that the correlation between the first arriving wave level and the delay spread is high and the variation width of the first arriving wave level and the delay spread are increased compared to the values in a stationary train due to the effect of vibrations during motion. Next, in measurement with a receiving antenna oriented outward to study the effect of waves reflected from the exterior of the train, the delay spread was found not have a correlation with the first arriving wave level but to vary with the effects of the environment. An environment that affects the delay spread is metallic sign boards placed in tunnels and train stations. For each measurement parameter, the minimum and maximum values, central value, mean, and variance are presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.