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

A method for receiving, by a base station (BS), channel state information (CSI) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), a channel state information reference signal (CSI-RS) on multi-antenna ports;
• and
• receiving CSI from the UE, wherein:
• the CSI comprises first information related to a codebook and second information related to the codebook,
• the codebook comprises a plurality of precoding matrices, each of the plurality of precoding matrices generated based on a first matrix for a first-dimensional antenna port and a second matrix for a second-dimensional antenna port,
• the first matrix is determined based on a first-dimensional related index of each of the plurality of precoding matrices, the second matrix is determined based on a second-dimensional related index of each of the plurality of precoding matrices,
• a pair of first-dimensional related index and second-dimensional related index for a precoding matrix of the plurality of precoding matrices consists of (x,y), (x+1,y), (x,y+1), and (x+1,y+1), and the x and y are integers other than a negative number, and
• the first-dimensional related index and the second-dimensional related index of each of the plurality of precoding matrices are based on the first information.

A terminal of reporting channel state information (CSI) in a wireless communication system, the terminal comprising:

• a transmitter and a receiver;
• and
• a processor, operatively coupled to the transmitter and the receiver, wherein the processor is configured to:
• control the receiver to receive, from a base station, a channel state information reference signal (CSI-RS) on multi-antenna ports;
• and
• control the transmitter to transmit, to the base station, CSI, wherein:
• the CSI comprises first information related to a codebook and second information related to the codebook,
• the codebook comprises a plurality of precoding matrices, each of the plurality of precoding matrices generated based on a first matrix for a first-dimensional antenna port and a second matrix for a second-dimensional antenna port,
• the first matrix is determined based on a first-dimensional related index of each of the plurality of precoding matrices, the second matrix is determined based on a second-dimensional related index of each of the plurality of precoding matrices,
• a pair of first-dimensional related index and second-dimensional related index for a precoding matrix of the plurality of precoding matrices consists of (x,y), (x+1,y), (x,y+1), and (x+1,y+1), and the x and y are integers other than a negative number, and
• the first-dimensional related index and the second-dimensional related index of each of the plurality of precoding matrices are based on the first information.