1. Design a m-MIMO system using large and dense constellations, Nyquist filtering close to the minimum band for high spectral efficiency and non linear amplifiers (NLAs) for high power efficiency, while maintaining low complexity.
2. Design a transmitter able to deal with large constellations by splitting them as sum of Offset Quadrature Phase-Shift Keying (OQPSK)-type signals with a reduced dynamic range leveraged by MM techniques specially designed to control the outer and inner envelope of each OQPSK bandwidth-limited signal, guaranteeing a ring shape (close to an empty circumference) of the final IQ transition diagram allowing for the use of NLAs.
3. Design of low-complexity m-MIMO architectures for joint amplification, BF and/or SM that are compatible with low-cost, power-efficient NLAs.
4. Design of receivers using FDE that tackle the effects of the transmitter’s impairments (e.g. nonlinear amplification and MM distortion, correlation between antenna elements), the multipath characteristics of the mm-Wave channel and, most important, able to separate SM’s data streams.

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