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Technical review demonstrates how flexible feedback and configurable antenna arrays enable massive MIMO in 5G NR, highlighting mechanisms to scale beamforming across large arrays.
Massive multiple-input multiple-output (MIMO) is an important technology in fifth generation (5G) cellular networks and beyond. To help design the beamforming at the base station, 5G has introduced new support in the form of flexible feedback and configurable antenna array geometries that allow for arbitrarily massive physical arrays. In this article, we present an overview of MIMO throughout the mobile standards, highlight the new beam-based feedback system in 5G NR, and describe how this feedback system enables massive MIMO through beam management. Finally, we conclude with challenges related to massive MIMO in 5G.
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Dreifuerst et al. (2023) studied this question.
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