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In this paper, a rigorous link performance test for MIMO OTA(multiple-input-multiple-output over-the-air) characterisation with traceablesignal-to-interference-plus-noise ratio (SINR) is presented. Measurements weremade with three different testbeds which represent the 4G (fourth-generation)LTE (long term evolution) SISO (single-input-single-output), 4G LTE MIMO and 5G(fifth-generation) millimetre-wave (mm-wave) MIMO communication systems,respectively, in the small antenna radiated test (SMART) screened fullyanechoic chamber, screened control room and reverberation chamber at the UKNational Physical Laboratory (NPL). The measurement campaign comprised ofautomated data acquisition of channel power, downlink (DL) & uplink (UL) errorvector magnitude (EVM) and throughput. The measurement repeatability has beenassessed with standard deviation plotted as error bars and the uncertaintysources in the OTA test are analysed.

A rigorous link performance and measurement uncertainty assessment for MIMO OTA characterisation