Saleh-Valenzuela modelization and clustering information for a mmwave intra-train channel

The connected train is one of the key scenarios for 5G mobile communications. The reason is clear: providing connectivity on an ultra-dense environment in mobility is a double challenge (high-speed trains can go up to 350 km/h and metro trains are able to carry more than 1000 people in a 100 meters-long train). The spectrum below 6 GHz is crowded and the opportunity comes from mmwave band. This paper analyzes the intra-train channel at 26.5-40 GHz using a VNA, taking measurements at 5 different distances, 4 angles and two type of antennas. The outcome of this experiment is the PDP on each scenario, multipath clusters and Saleh-Valenzuela modelization of the channel. Differences between the scenario with and without people are explained as well.