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

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 fullydigital 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.

On the Road to 6G: Visions, Requirements, Key Technologies, and Testbeds

“…Another real-time millimeter-wave massive MIMO testbed named LuMaMi28 was presented in [559] by groups from Lund University. LuMaMi28 consists of a base station with 16 transceiver chains and multiple users equipped with a beamswitchable antenna array.…”

Beyond 5G: A Comprehensive Exploration of 6G Wireless Communication Technologies

“…FORMAT demonstrated a 4.8-Gbps downlink speed with 64 QAM modulation at 28.5 GHz. Lund University's real-time mmWave massive MIMO testbed, LuMaMi28, showcased performance in various scenarios [228]. Addressing mmWave's limited coverage due to atmospheric attenuation, researchers presented a real-time photonics-assisted mm-Wave communication technology in [229].…”