Abstract: MIMO technology has been studied in textbooks for several decades, and it has been adopted in 4G and 5G systems. Due to the recent evolution in 5G and beyond networks, designed to cover a wide range of use cases with every time more complex applications, it is essential to have network simulation tools (such as ns-3) to evaluate MIMO performance from the network perspective, before real implementation. Up to date, the well-known ns-3 simulator has been missing the inclusion of single-user MIMO (SU-MIMO) models for 5G. In this paper, we detail the implementation models and provide an exhaustive evaluation of SU-MIMO in the 5G-LENA module of ns-3. As per 3GPP 5G, we adopt a hybrid beamforming architecture and a closed-loop MIMO mechanism and follow all 3GPP specifications for MIMO implementation, including channel state information feedback with precoding matrix indicator and rank indicator reports, and codebook-based precoding following Precoding Type-I (used for SU-MIMO). The simulation models are released in open-source and currently support up to 32 antenna ports and 4 streams per user. The simulation results presented in this paper help in testing and verifying the simulated models, for different multi-antenna array and antenna ports configurations. Biljana Bojovic Improving the Efficiency of MIMO Simulations in ns-3 (2023) ns-3 and 5G-LENA Extensions to Support Dual-Polarized MIMO (2022) Implementation of A Spatial Channel Model for ns-3 (2020) ns-3 Implementation of the 3GPP MIMO Channel Model for Frequency Spectrum above 6 GHz (2017) A Comparison of MIMO Techniques in Downlink Millimeter Wave Cellular Networks with Hybrid Beamforming (2015) J. Bach Andersen, Antenna arrays in mobile communications: Gain, diversity, and channel capacity, IEEE Antennas and Propagation Magazine 42 (2000) 12–16. Z. Pi, F. Khan, An introduction to millimeter-wave mobile broadband systems, IEEE Communications Magazine 49 (2011) 101–107. Modeling and analyzing millimeter wave cellular systems, IEEE Transactions on Communications 65 (2017) 403–430. New radio beam-based access to unlicensed spectrum: Design challenges and solutions, IEEE Communications Surveys Tutorials 22 (2020) 8–37. A survey on hybrid beamforming techniques in 5g: Architecture and system model perspectives, IEEE Communications Surveys & Tutorials 20 (2018) 3060–3097. Network simulations with the ns-3 simulator, SIGCOMM demonstration 14 (2008). Enhancing 5g qos management for xr traffic through xr loopback mechanism, IEEE Journal on Selected Areas in Communications 41 (2023) 1772–1786. An E2E Simulator for 5G NR Networks, Simulation Modelling Practice and Theory 96 (2019) 101933. End-to-End Simulation of 5G mmWave Networks, IEEE Communications Surveys & Tutorials 20 (2018) 2237–2263.

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