Delay Spread Estimation in Presence of Obstruction Medium for 6G Channels

This work obtains a relation between the root mean square (RMS) delay spread, permittivity, and thickness of obstructing dielectric in 6G spectrum for OLoS (Obstructing Line of sight) based measurement setup. Different dielectric materials are used as obstructing surfaces placed in front of the transmitter antenna in this scenario. Channel Impulse Response of the specified OLoS case is theoretically analyzed using the multipath model, followed by studying the impact of varying separation between transmitter and receiver and the permittivity and thickness of the obstructing dielectric medium on RMS delay spread. A mathematical relation between RMS delay spread and the mentioned parameters is established based on the obtained theoretical model. This relation is experimentally validated through measurements using polystyrene, PMMA, and plywood as obstructing dielectric materials. The unique placement of the obstructing dielectric material adjacent to the antenna finds its application in propagation channel modeling for flat radome-based antennas.