Patent ID: 8331255
Filing Date: 2012-12-11
Classification: H04B

Abstract:
1. A beamforming method for use in a base station for transmitting a plurality of streams through a plurality of antennas, the method comprising: receiving feedback information including information on a first codeword selected from a codebook including a plurality of codewords from each of a plurality of user terminals; grouping the plurality of user terminals by use of the feedback information from each user terminal; determining a user terminal to which the plurality of streams will be assigned of the plurality of user terminals and determining a second codeword to be used for beamforming from the codebook, by use of the feedback information of each user terminal and grouping information; multiplying data to be transmitted through the plurality of steams by the second codeword; and multiplying the data, having been multiplied by the second codeword, by a unitary matrix.