Cluster Intensity and Spread Characteristics in Classroom Scenario at 10 and 28 GHz Bands

This paper discusses the cluster spreads and scattering intensity (SI) characteristics at 10 and 28 GHz band in a typical classroom environment. The multi-path components (MPCs) were calculated from the measurement data using space-alternating generalized expectation-maximization (SAGE) algorithm. Next, the scattering point-based KPowerMeans (SPKPM) algorithm was used to obtain the clusters based on interacting objects (IOs) in the environment. Lastly, the cluster delay spread (DS), angular spread (AS), and SI were computed and their characteristics were discussed. The results showed that the channels at both bands were almost equally directive. Moreover, cluster spreads depended on the number of layers and surfaces of IOs, whereas IO material and propagation mechanism influenced the cluster SI.