We analyze theoretical distributions of MIMO channel capacity for different antennas in 2D and 3D statistically isotropic\r\nenvironments, which may be generated by multiprobe anechoic and reverberation chambers, respectively.We observe that the two\r\nenvironments yield comparable capacity distributions provided that (1) the 2D statistically isotropic environment�s capacity data\r\nare taken at many different antenna orientations and (2) the radiation elements have a low directivity. When these conditions are\r\nmet, we find that the relative error between the 2D statistically isotropic environment�s orientation-combined capacity distribution\r\nand the 3D statistically isotropic environment�s capacity distribution is typically less than 10% for signal-to-noise ratios greater\r\nthan 5 dB.
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