Method for transmitting channel state information reference signal

A method performed by a terminal in a wireless communication system, the method comprising:

• receiving, from a base station, channel state information-reference signal (CSI-RS) transmission configuration information including one or more code-division multiplexing (CDM) groups with uniform frequency distribution of resource elements (RE) in each CDM group;
• receiving, from the base station, CSI-RS based on the CSI-RS transmission configuration, wherein the CSI-RS is modulated by an orthogonal cover code (OCC) in frequency domain (FD) across resource elements based on discrete Fourier transform (DFT) vector and in time domain (TD) across one or more orthogonal frequency-division multiplexing (OFDM) symbols based on Walsh-Hadamard (WH) code;
• and
• transmitting, to the base station, channel state information based on a measurement for the CSI-RS.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller configured to:
• control the transceiver to transmit, to a terminal, channel state information-reference signal (CSI-RS) transmission configuration information including one or more code-division multiplexing (CDM) groups with uniform frequency distribution of resource elements (RE) in each CDM group,
• control the transceiver to transmit, to the terminal, CSI-RS generated for each antenna port of the base station based on the CSI-RS transmission configuration, wherein the CSI-RS is modulated by an orthogonal cover code (OCC) in frequency domain (FD) across resource elements based on discrete Fourier transform (DFT) vector and in time domain (TD) across one or more orthogonal frequency-division multiplexing (OFDM) symbols based on Walsh-Hadamard (WH) code, and
• control the transceiver to receive, from the terminal, channel state information based on the CSI-RS.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• control the transceiver to receive, from a base station, channel state information-reference signal (CSI-RS) transmission configuration information including one or more code-division multiplexing (CDM) groups with uniform frequency distribution of resource elements (RE) in each CDM group,
• control the transceiver to receive, from the base station, CSI-RS based on the CSI-RS transmission configuration, wherein the CSI-RS is modulated by an orthogonal cover code (OCC) in frequency domain (FD) across resource elements based on discrete Fourier transform (DFT) vector and in time domain (TD) across one or more orthogonal frequency-division multiplexing (OFDM) symbols based on Walsh-Hadamard (WH) code, and
• control the transceiver to transmit, to the base station, channel state information based on a measurement for the CSI-RS.