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One of the technologies seen as a key for optimizing the spectral efficiency of 5G networks is massive multiple-input, multiple-output (MIMO) antenna arrays. But before 5G standards are established and base stations are constructed, wireless network operators must determine an effective way to perform over-the-air (OTA) testing of massive MIMO base stations.
Testing massive MIMO arrays poses much more of a problem than the traditional characterization of an antenna's radiation pattern in an anechoic chamber. Massive MIMO arrays consist of potentially hundreds of antennas in one location, such as a base station, to manage the use of frequencies and time slots for many simultaneous users. A great deal of theory...