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In this work, we present a 2x2 near-field multi-input multiple-output (MIMO)prototype for bit-error-rate (BER) and error vector magnitude (EVM)measurements in a metal enclosure. The near-field MIMO prototype is developedusing software-defined-radios (SDRs) for over-the-air transmission of QPSKmodulated baseband waveforms. We check the near-field MIMO BER and EVMmeasurements in three different scenarios in a highly reflecting metalenclosure environment. In the first scenario, the line-of-sight (LOS)communication link is investigated when the mode-stirrer is stationary. Instationary channel conditions near-field MIMO BER and EVM measurements areperformed. In the second scenario, BER and EVM measurements are performed indynamic channel conditions when the mode-stirrer is set to move continuously.In the third scenario, LOS communication near-field MIMO BER and EVMmeasurements are performed in stationary channel conditions but now in thepresence of MIMO interference. In three different scenarios, near-field MIMOBER and EVM measurements are investigated at different Tx USRP gain values andin the presence of varying levels of MIMO interference.

2x2 MIMO Prototype for BER and EVM Measurements in Metal Enclosure