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Dynamic Channel Emulation in a Cost-Effective MPAC Setup for mmWave Devices Over-The-Air Testing with Dominant Cluster Concept

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Document pages: 13 pages

Abstract: Millimeter-Wave (mmWave) has been considered as the key enabler for the fifthgeneration (5G) communications. The link budget and spectral efficiency ofmmWave communications can be further enhanced by adopting the massivemultiple-input-multiple-output (MIMO) exploiting beamforming. Nevertheless, itis essential to design and test mmWave 5G devices under various realisticscenarios, since the uncontrollable radio propagation channels pose intrinsiclimitations on system performance. This requires emulating the realisticdynamic mmWave channels in a reproducible manner in laboratories, hence thegoal of this paper. In this contribution, the beamforming effect is firstlyinvestigated, showing that the non-dominant clusters existing in the mmWavechannels are insignificant with beamforming operations applied in mmWave 5Gdevices. Thus, an over-the-air (OTA) emulation strategy for dynamic mmWavechannels is then proposed based on a dominant-cluster concept using a sectoredmultiprobe anechoic chamber (SMPAC) setup. The key design parameters includingthe probe number and the angular spacing of probes are investigated throughcomprehensive simulations. A cost-effective switch circuit is also designed forthis purpose and validated in the simulation. Furthermore, a dynamic mmWavechannel measured in an indoor scenario at 28-30 GHz is presented, where theproposed emulation strategy is also validated by reproducing the measuredreality.

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