Development of MIMO over-the-air (OTA) test methodology is ongoing. Several test methods have been proposed. Anechoic\r\nchamber-based multiple-probe technique is one promising candidate for MIMO-OTA testing. The required number of probes for\r\nsynthesizing the desired fields inside the multiprobe system is an important issue as it has a large impact on the cost of the test\r\nsystem. In this paper, we review the existing investigations on this important topic and end up presenting rules for the required\r\nnumber of probes as a function of the test zone size in wavelengths for certain chosen uncertainty levels of the field synthesis.
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