Method and apparatus for transmitting channel state information in wireless communication system
地域：
Seoul
摘要
A method for receiving channel state information (CSI) by a base station, includes transmitting configuration information indicating whether to use a 4 antenna ports codebook, wherein a first codebook index for a first precoding matrix indicator (PMI) and a second codebook index for a second PMI for a specific CSI report mode with 4 antenna ports are determined when the UE is configured to use the 4 antenna ports codebook; and receiving the CSI indicating the first codebook index and the second codebook index, wherein a value of the first codebook index is determined as follows: when a rank indicator (RI) is 1, the value of the first codebook index is determined based on a value of the first PMI multiplied by 4, and when the RI is 2, the value of the first codebook index is determined based on the value of the first PMI multiplied by 4.
說明書
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In Equation 10, a codeword is expressed as a vector of NT×1 (where NT is the number of Tx antennas) and is structured with an upper vector Xi(k) and a lower vector αjXi(k) which show correlation characteristics of a horizontal antenna group and a vertical antenna group, respectively. Xi(k) is preferably expressed as a vector having the characteristics of linear phase increment by reflecting the characteristics of a correlation between antennas of each antenna group and may be a DFT matrix as a representative example.
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