1. A method for computing precoder matrix indicators (PMIs) in a wireless communication system, the wireless communication system including a base station (eNB) which is operable to communicate with one or more user equipments (UEs) and a set of multiple transmit antennas associated with the eNB that are partitioned into multiple transmit antenna subsets with one of the subsets designated as a reference subset, wherein the UE(s) are operable to compute multiple PMIs for the respective multiple subsets and to report the multiple PMIs to the eNB for the eNB to use in precoding, the method comprising: computing a PMI for a given subset based on or using the PMI for the reference subset.