CPC H04B 7/0456 (2013.01) | 25 Claims |
1. A method performed by a network node, the method comprising:
receiving channel state information, CSI, from each of a plurality of wireless devices;
determining at least one null space based on the received CSI from each of the plurality of wireless devices;
determining a common precoding matrix index, PMI, the common PMI comprising a common beamforming vector which is not in the at least one null space of any one of individual beamforming vectors of the plurality of wireless devices; and
causing a multicast broadcast transmission to the plurality of wireless devices using at least the common PMI.
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