Methods, systems, and devices are described for mapping, by a UE, uplink transmissions to one or more antennas of the UE. In one aspect, a UE may receive an uplink resource allocation identifying a set of resource blocks (RBs) from a base station. The UE may map subsets of the set of RBs to one or more of a plurality of antennas of the UE and transmit one or more uplink transmissions, using the subsets of the set of resource blocks, on the one or more antennas based at least in part on the mapping. Additionally, in some aspects, the UE may determine channel characteristics or CSI associated with the downlink from the base station and base the mapping of subsets of RBs to one or more antennas of the UE on the determined channel characteristics/CSI.