A reverberation chamber is a convenient tool for over-the-air testing of MIMO devices in isotropic environments. Isotropy is\r\ntypically achieved in the chamber through the use of a mode stirrer and a turntable on which the device under test (DUT) rides.\r\nThe quality of the isotropic environment depends on the number of plane waves produced by the chamber and on their spatial\r\ndistribution. This paper investigates how the required sampling rate for the DUT pattern is related to the plane-wave density\r\nthreshold in the isotropic environment required to accurately compute antenna correlations. Once the plane-wave density is above\r\nthe threshold, the antenna correlation obtained through isotropic experiments agrees with the antenna correlation obtained from\r\nthe classical definition, as has been proven theoretically. This fact is verified for the good, nominal, and bad reference antennas\r\nproduced by CTIA. MIMO channel capacity simulations are performed with a standard base station model and the DUT placed\r\nin a single-tap plane-wave reverberation chamber model. The capacity curves obtained with the good, nominal, and bad reference\r\nantennas are clearly distinguishable.
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