 is not suitable for mobile applications. The results here show the possibility of using these high frequencies for mobile communications by employ- ing beamforming and beam tracking techniques to facilitate connections through reflected paths. 11.5 Summary In this chapter, Section 11.2 presented the propagation characteristics of frequency bands above 6 GHz based on measurements. First, fundamental experimental results for the 20 (or 26) GHz band were shown, where the characteristics of the path loss open space, building corner diffraction loss, building penetration loss, scattering effects on rough surface, and human blockage effects were clarified. These are useful for under- standing the basic characteristics of the above 6 GHz bands. Next, the measurement results of frequency bands above 6 GHz (mainly the 20 GHz band) were shown, where the path loss characteristics and channel model parameters in the UMi, InH, and O2I scenarios were clarified. Note that in the UMi and O2I scenarios, frequency-dependent characteristics of the path loss were also discussed based on the measurement results from the 0.8 to 37 GHz band. These are helpful for understanding the characteristics in the environment where 5G will actually be deployed. Section 11.3 presented field experiments on the downlink throughput performance of a 5G centimeter wave radio access system at 4.5 GHz with 400 MHz bandwidth employing higher rank MIMO in a shopping mall environment and a long corridor References environment. The shopping mall has complex reflection paths within its NLOS areas. The long corridor environment exhibits LOS propagation with many reflection paths. The results show that a maximum throughput of more than 4.8 Gbps in the downlink is achieved in 20% of the course in the shopping mall environment using patch antenna in both the BTS and the UE when configuring the MCS as Rank-4 64QAM R = 0.8. However, Rank-8 transmission is not effective in this environment, since it achieved only up to 4.5 Gbps instantaneously because of the spatia