Massive MIMO, 5G, and IoT
Massive MIMO is the term used by the Wireless-Communication community to describe large antenna arrays (together with the accompanying RF front-end and digital signal processing) that are essentially used by base stations to simultaneously communicate with multiple mobile and/or stationary units. It is expected that massive MIMO will play a key role in 5G and the tightly related Internet of Things (IoT) and Internet of Space (IoS) in terms of the target data rates (up to 10 Gb/s), latency (less than 1 ms), and energy consumption per transmitted bit (less than 1/1000 of the current one). In this research, the subject is lighted up from both deterministic and stochastic perspectives. Deterministic coverage includes issues related to the design and optimization of large antenna arrays and their feed networks, mutual coupling between array elements, multi-band and multi-polarization operation, trade-off between digital beamforming and hardware phase shifters, and packaging of the RF front end and the antenna array. Channel modelling and issues related to diversity, data multiplexing, and information capacity highlight the stochastic coverage.