Patent ID: 8891651
Filing Date: 2014-11-18
Classification: H04B

Abstract:
1. A method of reporting channel state information in a wireless communication system, the method performed by a transmitter and comprising: selecting a Mt×R precoding matrix in a codebook according to a rank indicating a number of layers; and reporting precoding matrix indication information indicating the selected Mt×R precoding matrix to a base station, wherein Mt denotes a number of antenna ports of the transmitter and R denotes the rank, wherein the codebook includes K Mt×R matrices, where K>1, wherein each of the K Mt×R matrices in the codebook is defined by wherein P(k) denotes a k-th matrix in the codebook, k=1, ..., K, Q wherein w wherein each of the first, second, third, and fourth element matrices has Nt rows, where Nt=Mt/2.