Patent ID: 8619894

Claim:
A method comprising: creating a set of associations between codebook antenna ports and physical sub-elements of an antenna array, wherein each of the set of associations associates an antenna port specified by a codebook accessible to a base station with one of a set of physical sub-elements of an antenna array of the base station, wherein the physical sub-elements are arranged in cross-polarized pairs, and wherein the pairs are arranged at least in according to elevation; interpreting feedback information from a user device to select from the codebook an entry comprising a vector of weighting values, wherein each of the weighting values defines a relative weighting for a signal component to be input to an antenna port specified by an entry of the codebook; applying the vector of weighting values to a signal configured for transmission to a user device to form a signal vector comprising a vector of weighted signal components; and mapping each component of the vector of weighted signal components to a physical sub-element of the antenna array according to the set of associations.