Codebook-based signal transmission/reception method in multi-antenna wireless communication system, and device for same

A method for transmitting and receiving, by an evolved NodeB (eNB), a signal based on a codebook in a 2-dimensional multi-antenna wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), a channel state information-reference signal (CSI-RS) on multiple antenna ports;
• and
• receiving, from the UE, a channel state information (CSI) report, wherein:
• the CSI report includes a precoding matrix indicator (PMI) for representing a precoding matrix of a codebook related to a rank-1 transmission,
• the PMI includes a first PMI comprising a codebook index pair including a first dimensional index and a second dimensional index and a second PMI related to co-phasing,
• four precoding matrices of the codebook are determined by the codebook index pair,
• a precoding matrix of any one of the four precoding matrices is determined by the second PMI,
• the four precoding matrices are generated by a Kronecker product of a first matrix and a second matrix,
• the first matrix comprises one or more columns of a first discrete Fourier transform (DFT) matrix selected based on a number of antenna ports of a first dimension and a first oversampling factor related to the first dimension, and
• the second matrix comprises one or more columns of a second DFT matrix selected based on a number of antenna ports of a second dimension and a second oversampling factor related to the second dimension.

A user equipment (UE) for transmitting and receiving a signal based on a codebook in a 2-dimensional multi-antenna wireless communication system and comprising:

• a radio frequency (RF) module configured to transmit and receive a wireless signal;
• and
• a processor functionally connected to the RF module and configured to:
• receive, from an evolved NodeB (eNB), a channel state information-reference signal (CSI-RS) on multiple antenna ports;
• and
• transmitting, to the eNB, a channel state information (CSI) report, wherein:
• the CSI report includes a precoding matrix indicator (PMI) for representing a precoding matrix of a codebook related to a rank-1 transmission,
• the PMI includes a first PMI comprising a codebook index pair including a first dimensional index and a second dimensional index and a second PMI related a co-phasing,
• four precoding matrices of the codebook are determined by the codebook index pair,
• a precoding matrix of any one of the four precoding matrices is determined by the second PMI,
• the four precoding matrices are generated by a Kronecker product of a first matrix and a second matrix,
• the first matrix comprises one or more columns of a first discrete Fourier transform (DFT) matrix selected based on a number of antenna ports of a first dimension and a first oversampling factor related to the first dimension, and
• the second matrix comprises one or more columns of a second DFT matrix selected based on a number of antenna ports of a second dimension and a second oversampling factor related to the second dimension.