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The use of millimeter waves for wireless communications is one of the maintechnological innovations of 5G systems with respect to previous generations ofcellular systems. Their consideration, however, has been up to now mainlyrestricted to the case in which analog or, at most, hybrid analog-digitalbeamforming structures were used, thus posing a limitation on the multiplexingcapabilities and peak data rates that could be theoretically achieved at thesefrequencies. Recent progress in the field of electronics, however, has made theenergy consumption of digital beamforming structures at least on par with thatof analog beamforming, thus redeeming them from the ghetto they had been placedin over the last year. Digital beamforming, coupled with the use of largeantenna arrays at both sides of the communication link, promises thus to be oneof the secret weapons of future 6G networks, capable of unleashingunprecedented values of spectral and energy efficiency for ultra-broadbandconnectivity.

The Ultimate Weapon for Ultra-Broadband 6G: Digital Beamforming and Doubly Massive mmWave MIMO