In next-generation mobile communication systems, utilization of higher frequency bands above 10 GHz has become a hot research topic because it has the potential to improve network capacity drastically by utilizing the available wideband spectrum. However in the higher frequency bands, in addition to the higher propagation loss, diffuse scattering of propagation wave is thought to affect the multiple-input multiple-output (MIMO) channel characteristic more significantly. In this paper, 11 GHz band MIMO channel measurements were conducted in a line-of-sight (LoS) indoor environment to clarify the characteristics of diffuse scatterings in the higher frequency band. The frequency, angular, and the polarization domain dense multipath component (DMC) propagation parameters were estimated by using the RiMAX-based estimator. The measurement result shows that there was a significant DMC due to diffuse scatterings from the floor and the ceiling. The DMC had directional and polarization dependencies that were different from the RiMAX DMC model. The result is expected to be utilized for the novel MIMO channel model proposal in the higher frequency band that includes the DMC contribution.
['Kentaro Saito', 'Jun-ichi Takada', 'Minseok Kim']
Dense multipath component parameter estimation in 11GHz-band indoor environment