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This paper considers millimeter-wave access network systems using a hybrid beamforming structure, which is a combination of digital and analog beamformers. To multiplex mobile stations in the frequency domain along with the space and time domain improves a system capacity for the following reasons: it exploits frequency diversity, accommodates mobile stations that can only use a limited bandwidth...
Millimeter-wave communication is one way to alleviate the spectrum gridlock at lower frequencies while simultaneously providing high-bandwidth communication channels. MmWave makes use of MIMO through large antenna arrays at both the base station and the mobile station to provide sufficient received signal power. This article explains how beamforming and precoding are different in MIMO mmWave systems...
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