1. A method of wireless communication at a base station, comprising:receiving a plurality of precoding matrix indicators (PMIs) from a plurality of user equipment (UEs), each PMI in the plurality of PMIs being received from a different UE;
determining, at the base station, a categorization of PMIs into a plurality of PMI sets, wherein the plurality of PMI sets comprise a first PMI set that includes at least a first PMI and a second PMI that is different than the first PMI, wherein the second PMI is categorized into the first PMI set with the first PMI based on the second PMI being a column permutation of the first PMI;
assigning each UE of the plurality of UEs to a UE group based on at least one PMI received from a corresponding UE, each UE group being associated with a different PMI set in the plurality of PMI sets, wherein at least one UE is assigned to a first UE group associated with the first PMI set that includes at least the first PMI and the second PMI;
assigning a transmission scheme to each UE group; and
transmitting a combined transmission to the first UE group associated with the first PMI set, the combined transmission being based at least in part on the transmission scheme assigned to the first UE group.