Arrival angle distribution control in MIMO-OTA measurement environment using double-layered reverberation chamber

Two types of methods are used to develop MIMO-OTA (over-the-air) measurement systems. One is a fading emulator based method that involves the arrangement of a number of actual radiation antennas that represent scattering objects. The other involves the use of a radio echoic chamber named “reverberation chamber” (RC) consisting of six metallic walls [1]. An RC has the advantage of being able to easily create a multipath-rich environment with large delay. On the other hand, it is incapable of controlling the propagation parameters and producing fast temporal variations. A pioneering example of an RC system has been presented [2]; however, we consider that this system has limited capability. Therefore, we developed a new RC and suggested approaches to overcome the demerits of the previously proposed RC [3]. In this paper, we have proposed an RC with arrival angle distribution control; further, through an experiment, we demonstrated that channel characteristics corresponding to desired angular distributions can be achieved using this RC.