Study of propagation mechanisms and identification of scattering objects in indoor multipath channels at 11 GHz

This paper investigates the dominant propagation mechanisms in indoor line-of-sight (LOS) environments from channel measurement and ray tracing simulation. Double-directional channel sounding was performed using 24×24 multiple-input multiple-output (MIMO) channel sounder at 11 GHz with 400 MHz bandwidth to get the MIMO channel transfer function. Path parameters from ray tracing simulation and antenna array response were used to reconstruct the ray tracing based channel transfer function. Beamforming was applied to both channel transfer functions to get angle resolved power spectrum. Then the angular and delay power spectra were used to identify the dominant propagation mechanisms. Along with LOS component, walls and window reflected paths were found to be the dominant propagation mechanisms observed in both measurement and simulation. But ray tracing failed to predict the scattering power from the long and thin metal objects such as window frame and metal pillar edge which are the significant objects observed in measurement.