Embedded below is a recent paper from IEEE Communications Magazine on the role of various techniques in 5G. The main focus is achieving higher spectral efficiency. From the paper: "From a high-level perspective, there are three main contributors to reaching higher spectral efficiency: advanced interference mitigation, small cells for densification of the network nodes, and massive multiple-input multiple-output (MIMO), that is, a significant increase in the number of antennas at the base station and potentially also at the terminal."
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