  Wireless communication in millimetre wave bands, namely above 20 GHz and up
to 300 GHz, is foreseen as a key enabler technology for the next generation of
wireless systems. The huge available bandwidth is contemplated to achieve high
data-rate wireless communications, and hence, to fulfil the requirements of
future wireless networks. In this paper, we discuss and illustrate new
paradigms for the sub-THz physical layer, which either aim at maximizing the
spectral efficiency, minimizing the device complexity, or finding good
tradeoff. The solutions offered by appropriate modulation schemes and
multi-antenna systems are assessed based on various potential scenarios.
