Analog signal processing typically implies that beamforming is carried out on a per-carrier basis. For the downlink transmission, this implies that it is not possible to frequency-multiplex beamformed transmissions to devices located in different directions relative to the base station. In other words, beamformed transmissions to different devices located in different directions must be separated in time.
4.1.9.3.2 Digital Beamforming
While analog beamforming is generally restricted to one RF chain even when using large number of antenna arrays, digital beamforming in theory supports as ...
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