B. Halvarsson, Elias Karam, Martin Nystrom, Roger Pirinen, A. Simonsson, Qiang Zhang, Peter Ökvist
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Distributed MIMO demonstrated with 5G radio access prototype
This paper presents measurement results from a distributed 4×4 multiple-input multiple-output (MIMO) trial. The measurements were performed using a 5G radio access prototype including two transmission points (TPs) and a mobile terminal over 200 MHz bandwidth at 15 GHz carrier frequency. The TPs and the mobile terminal each consists of multiple antennas, enabling spatial multiplexing. In the present paper, improvements from using 4×4 MIMO transmission with dual TPs are being assessed and compared with 4×4 MIMO transmission from one single TP. A significant increase in throughput was demonstrated with distributed MIMO where the two TPs were transmitting unique streams in parallel. This significantly improved the spatial multiplexing capacity in line-of-sight and increased the rank significantly beyond the two polarization dimensions. In the performed tests this improved the throughput from 1.1 Gbps (5.7 bps/Hz) to 2.5 Gbps (12.6 bps/Hz).
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