Abstract: A method for hybrid digital-analog beamforming a communication system. The method includes obtaining a plurality of transmit phase shifted signals by obtaining a hybrid precoding matrix FH. The hybrid precoding matrix FH is obtained based on a plurality of dominant right eigenvectors of a first effective channel matrix associated with a set of wireless channels. The hybrid precoding matrix FH includes a product of a digital precoding matrix F B ? B ( 1 ) and an analog precoding matrix FRF. Each entry of the analog precoding matrix FRF includes one of zero or a respective complex value with unit magnitude. Obtaining the plurality of transmit phase shifted signals further includes obtaining a digital precoding matrix F B ? B ( 2 ) based on the hybrid precoding matrix FH. Each wireless channel in the set of wireless channels is associated with a base station and a respective user equipment (UE) in a set of UEs.

Abstract: A method for hybrid digital-analog beamforming a communication system. The method includes obtaining a plurality of transmit phase shifted signals by obtaining a hybrid precoding matrix FH. The hybrid precoding matrix FH is obtained based on a plurality of dominant right eigenvectors of a first effective channel matrix associated with a set of wireless channels. The hybrid precoding matrix FH includes a product of a digital precoding matrix F B ? B ( 1 ) and an analog precoding matrix FRF. Each entry of the analog precoding matrix FRF includes one of zero or a respective complex value with unit magnitude. Obtaining the plurality of transmit phase shifted signals further includes obtaining a digital precoding matrix F B ? B ( 2 ) based on the hybrid precoding matrix FH. Each wireless channel in the set of wireless channels is associated with a base station and a respective user equipment (UE) in a set of UEs.