Flexible antenna deployment for 5G distributed Massive MIMO in low SHF bands

In order to tackle rapidly increasing traffic, distributed Massive MIMO (DM-MIMO) has been proposed for fifth-generation (5G) mobile communication systems. DM-MIMO coordinates lots of distributed transmission points (TPs) that are located in ultra-high density (UHD) and use various numbers of antenna elements for each TP. It can achieve drastic improvement of areal spectrum efficiency for 5G. It can also dynamically create user-centric virtual cells corresponding to user mobility. To design flexible antenna deployment of DM-MIMO that is applicable to various use cases in 5G, some key parameters such as the number of the distributed TPs, the number of antenna elements for each TP, and proper distance between TPs should be determined. This paper provides such discussion for 5G DM-MIMO with the flexible antenna deployment under fixed total transmission power and constant total number of antenna elements. Computer simulations show that DM-MIMO can achieve more than 2.5 times system throughput in comparison with a Massive MIMO system using 128 antenna elements.

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