Patent ID: 8787469
Filing Date: 2014-07-22
Classification: H04B,H04L

Abstract:
1. A base station, comprising: a grouping unit configured to group a plurality of data signals into a plurality of data signal groups, each of the data signal groups comprising selected ones of the plurality of data signals; a multiplexer configured to select one of the data signal groups to be transmitted by performing beamforming; a control unit configured to control the grouping unit and the multiplexer to perform beamforming using a codebook to generate a signal, the codebook comprising a plurality of matrices; a multi-antenna configured to transmit the data signal; and a codebook generator configured to generate the codebook, wherein: the codebook is generated by following requirements of: designate a plurality of column vectors as first column vectors of the plurality of matrices, the plurality of column vectors being configured to satisfy a Grassmannian line packing (GLP) criterion; and generate a second column vector of each of the matrices by multiplying the first column vector of each of the matrices by a rotation matrix according to the following equation: