Patent ID: 8781009

Claim:
A user Equipment (UE), comprising: a storage unit configured to store a codebook for an eight-antenna configuration, the codebook for the eight-antenna configuration comprising at least one rank-8 codeword for the eight-antenna configuration, the rank-8 codeword for the eight-antenna being obtained by extending rank-4 codewords for the eight-antenna configuration, wherein the rank-4 codeword for the eight-antenna configuration is generated by creating a matrix by multiplying a rank-4 codeword for a four-antenna configuration with a diagonal matrix and concatenating the rank-4 codeword for the four-antenna configuration with the matrix; a selecting unit configured to select a codeword in the codebook for the eight-antenna configuration stored by the storage unit; and a transmitting unit configured to send a label of the codeword selected by the selecting unit in the codebook for the eight-antenna configuration to a network node.