Over-the-Air Verification of Angle-of-Arrival Estimation in Millimeter-Wave Channel Sounders

In this paper, we discuss a controlled environment over-the-air verification approach for directional channel sounder receivers at millimeter-wave frequencies. The presented verification setup uses a benchtop compact antenna test range comprising two feed-reflector systems with overlapping quiet zones, thus creating two primary multipath components with well-defined angles of incidence at the receiver under test. We discuss possible verification scenarios and present initial measurement results for a virtual array/synthetic aperture-type SIMO channel sounder at 29 GHz.