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This paper presents a calibration method for measuring the channel capacity using a three-dimensional multiple-input multiple-output (MIMO) Over-The-Air (OTA) apparatus. The reference level is calibrated to establish the Gaussian angular power spectra in elevation in consideration of various power losses that exist in the fading emulator. The measured results of MIMO channel capacity agree well with the analytical outcomes calculated by Monte Carlo simulation, demonstrating that the proposed calibration method gives a high degree of accuracy for measuring the channel capacity using the three-dimensional MIMO-OTA apparatus.

Three-dimensional MIMO-OTA calibration to achieve the Gaussian angular power spectra in elevation