Measurements of millimeter wave indoor propagation and high-speed digital transmission characteristics at 60 GHz

Investigates the effects of antenna radiation patterns at the base station or the remote terminal on the multipath propagation characteristics for the design of millimeter-wave indoor communication systems. These effects were investigated by indoor multipath propagation and BPSK transmission measurements at 60 GHz conducted in a modern office room. Multipath channel characteristics were estimated from impulse responses measured for three types of base-station antennas and for two types of directive terminal antennas with different beam widths. The effects of multipath propagation characteristics on high-speed digital transmission channels were also investigated for almost simultaneously measured bit-error performances at transmission rates of 64, 128, and 256 Mbps. From the results of measurements, the use of directive antennas at the remote terminal and also the use of base station antennas with appropriate radiation patterns were found to be effective for reducing the effect of multipath. It is also found that the reduction of multipath is achieved by the use of circular polarization instead of linear polarization. We also examined the effectiveness of several propagation parameters obtained from multipath propagation measurements for the estimation of the indoor digital transmission characteristics such as bit-error performance