Patent ID: 8831126

Claim:
A method, in a network apparatus, of obtaining a precoding matrix, the network apparatus comprising a plurality of groups of cross-polarized linear array antennas, wherein the method comprises: obtaining first channel indicating information indicating a first code word; obtaining second channel indicating information indicating a second code word; and determining the precoding matrix, according to the first channel indicating information and the second channel indicating information, wherein the first code word and/or the second code word comprises phase shifts and amplitude differences among the plurality of groups of cross-polarized linear array antennas, the first code word is obtained via a formula including a third code word which does not comprise the phase shifts and amplitude differences among the plurality of groups of cross-polarized linear array antennas, and the second code word is obtained via a formula including a fourth code word which does not comprise the phase shifts and amplitude differences among the plurality of groups of cross-polarized linear array antennas.