Study of Channel Model Validation in Millimeter Wave MIMO OTA Test

Millimeter wave (mmWave) technology is one of the key technologies introduced in 5G new radio(NR). Abundance of spectrum resource allows the mmWave 5G NR to achieve higher rates, greater capacity and lower latency. Performance test is a powerful means to help develop mmWave technology. Particularly, over-the-air (OTA) test is the only practical method for mmWave technology due to the lack of accessible antenna port on mmWave devices. The Third Generation Partnership Project (3GPP) has started the studies on mmWave MIMO OTA performance test methodology for which channel model validation is crucial. This paper investigates the impact of test antenna pattern under near-field condition on mmWave channel model validation. Simulation shows that different models have different requirements for the test antennas of which omnidirectional antennas are not always needed.