Spatial fading channel emulation for over-the-air testing ofmillimeter-wave radios: concepts and experimental validations
Wei FAN1(), Lassi HENTIL2, Pekka KYTI2,3
1. Antenna Propagation and Millimeter-wave Systems (APMS) Section, Department of Electronic Systems, Aalborg University, Aalborg 9220, Denmark 2. Keysight Technologies Finland Oy, Oulu 90014, Finland 3. Centre for Wireless Communications, University of Oulu, Oulu 90014, Finland
Millimeter-wave (mmWave) communication is regarded as the key enabling component for fifth-generation (5G) cellular systems due to the large available spectrum bandwidth. To make mmWave new radio (NR) a reality, tremendous efforts have been exerted from the industry and academia. Performance evaluation of mmWave NR is a mandatory step and the key to ensuring the success of mmWave 5G deployment. Over-the-air (OTA) radiated method of testing mmWave NR in laboratory conditions is highly attractive, since it facilitates virtual field testing of mmWave devices in realistic propagation conditions. In this paper, we first discuss the need for and challenges in OTA measurement of mmWave 5G NR under fading channel conditions. After that, two promising candidate solutions, i.e., wireless cable and multi-probe anechoic chamber (MPAC), are detailed. Their principles, applicability for mmWave NR, and main challenges are discussed. Furthermore, preliminary experimental validation results in a frequency range 2 anechoic chamber are demonstrated for the wireless cable and MPAC methods at 28 GHz.
