28 GHz indoor channel measurements and modelling in laboratory environment using directional antennas

The millimeter-wave band will be one of the key components for the fifth generation (5G) wireless communication systems. A radio channel measurement was conducted at 28 GHz in a laboratory environment. Two horn antennas were used with a vector network analyzer. The transmitter antenna was fixed in one direction while the receiver antenna was rotated 360° in azimuth in the measurement. The space-alternating generalized expectation-maximization algorithm was utilized for the rotated directional antenna scenario to estimate channel parameters of multipath components. Power delay profile, power angle profile and root mean square delay spread were obtained from the measured results. The Saleh-Valenzuela model was used to characterize the measured channel and the intra-cluster parameters were extracted.