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This paper presents LuMaMi28, a real-time 28 GHz massive multiple-inputmultiple-output (MIMO) testbed. In this testbed, the base station has 16transceiver chains with a fully-digital beamforming architecture (withdifferent pre-coding algorithms) and simultaneously supports multiple userequipments (UEs) with spatial multiplexing. The UEs are equipped with abeam-switchable antenna array for real-time antenna selection where the onewith the highest channel magnitude, out of four pre-defined beams, is selected.For the beam-switchable antenna array, we consider two kinds of UE antennas,with different beam-width and different peak-gain. Based on this testbed, weprovide measurement results for millimeter-wave (mmWave) massive MIMOperformance in different real-life scenarios with static and mobile UEs. Weexplore the potential benefit of the mmWave massive MIMO systems with antennaselection based on measured channel data, and discuss the performance resultsthrough real-time measurements.

LuMaMi28: Real-Time Millimeter-Wave Massive MIMO Systems with Antenna Selection