Effect of vertical angle spread of propagation channel on MIMO OTA measurement method

Various OTA (over-the-air) measurement systems have been proposed and discussed for the evaluation of MIMO wireless communication devices. The spatial channel emulators, which is a typical MIMO OTA measurement method, usually assume only the horizontal angle spread of multipath radio propagation channel. In this report, the effect of vertical angle spread of propagation channel on MIMO OTA measurement is evaluated by the simulation based on the model of vertical and horizontal angle spread. The simulation result shows that the vertical angle spread has a substantial effect on antenna correlation and thus MIMO transmission performance. The need of emulation of vertical angle spread in the typical spatial channel emulators for MIMO OTA measurement is obviously inferred from the result.

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