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

TL;DR

This paper introduces LuMaMi28, a real-time 28 GHz massive MIMO testbed with antenna selection, demonstrating its performance in various real-world scenarios with static and mobile users.

Contribution

The paper presents a novel real-time mmWave massive MIMO testbed with antenna selection capabilities and provides empirical measurement results in diverse scenarios.

Findings

Antenna selection improves mmWave MIMO performance.

Real-time beamforming achieves effective spatial multiplexing.

Performance varies with user mobility and antenna configurations.

Abstract

This paper presents LuMaMi28, a real-time 28 GHz massive multiple-input multiple-output (MIMO) testbed. In this testbed, the base station has 16 transceiver chains with a fully-digital beamforming architecture (with different pre-coding algorithms) and simultaneously supports multiple user equipments (UEs) with spatial multiplexing. The UEs are equipped with a beam-switchable antenna array for real-time antenna selection where the one with 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, we provide measurement results for millimeter-wave (mmWave) massive MIMO performance in different real-life scenarios with static and mobile UEs. We explore the potential benefit of the mmWave massive MIMO systems with antenna selection based on measured channel data, and discuss the performance results through real-time measurements.