Method for transmitting/receiving reference signal in wireless communication system, and device therefor

1. A method for demodulating, by a terminal, data in a wireless communication system, the method comprising:

receiving, from a base station, configuration information related to a configuration of a demodulation reference signal (DMRS);

receiving, from the base station, the DMRS transmitted through a plurality of antenna ports based on the configuration information; and

demodulating the data by using the received DMRS,

wherein the DMRS is mapped to an Orthogonal Frequency Division Multiplexing (OFDM) symbol according to a specific pattern and multiplexed through a Code Division Multiplexing scheme,

wherein, based on the Code Division Multiplexing scheme, a cyclic shift code is applied in a frequency domain and an orthogonal cover code is applied in a time domain, and

wherein a bit number of the configuration information is determined based on a number of codewords related to the DMRS and the configuration information includes at least one of the number of a plurality of antenna ports, the number of symbols to which the DMRS is mapped, or a number of layers related to the DMRS.

2. The method of claim 1 , wherein the specific pattern is one of a first pattern in which the DMRS is mapped to one OFDM symbol or a second pattern in which the DMRS is mapped to two OFDM symbols.

3. The method of claim 1 , wherein the DMRS is transmitted on a specific antenna port among the plurality of antenna ports and positioned on one or two time axis symbols which are the same as at least one another DMRS transmitted on another antenna port among the plurality of antenna ports.

4. The method of claim 1 , wherein a DMRS sequence for generating the DMRS is generated by the cyclic shift code, the orthogonal cover code, and a base sequence.

5. The method of claim 4 , wherein, based on the cyclic shift code being w freq,p (k′), the orthogonal cover code being w time,p (l′), and the base sequence being r(k″), the DMRS sequence a k,l (p) is generated by one of two following equations:

a k,l (p) =w time,p ( l ′)· w freq,p ( k ′)· r ( k ″) or

a k,l (p) =w time,p ( l ′)· w freq,p ( k ′)· r ( k″,l ″).

6. The method of claim 4 , wherein the base sequence is generated in units of one OFDM symbol.

7. The method of claim 4 , wherein the base sequence is initialized by an index of the OFDM symbol.

8. The method of claim 1 , further comprising:

performing a channel estimation procedure for estimating a channel for receiving the data by using the DMRS,

wherein the channel estimation procedure is performed by using a cyclic shift characteristic by the cyclic shift code.

9. The method of claim 1 ,

wherein the cyclic shift code is a Discrete Fourier Transform (DFT) code, and

wherein the orthogonal cover code is a Walsh-Hadamard code.

10. A terminal demodulating data in a wireless communication system, the terminal comprising:

a radio frequency (RF) unit including a transceiver configured to transmit and receive a radio signal; and

a processor functionally coupled with the RF unit,

wherein the processor is configured to

receive, from a base station, configuration information related to a configuration of a demodulation reference signal (DMRS),

receive, from the base station, the DMRS transmitted through a plurality of antenna ports based on the configuration information, and

demodulate the data by using the received DMRS,

wherein the DMRS is mapped to an Orthogonal Frequency Division Multiplexing (OFDM) symbol according to a specific pattern and multiplexed through a Code Division Multiplexing scheme,

wherein, based on the Code Division Multiplexing scheme, a cyclic shift code is applied in a frequency domain and an orthogonal cover code is applied in a time domain, and

wherein a bit number of the configuration information is determined based on a number of codewords related to the DMRS and the configuration information includes at least one of the number of a plurality of antenna ports, the number of symbols to which the DMRS is mapped, or a number of layers related to the DMRS.

11. The terminal of claim 10 , wherein the specific pattern is one of a first pattern in which the DMRS is mapped to one OFDM symbol or a second pattern in which the DMRS is mapped to two OFDM symbols.

12. The terminal of claim 10 , wherein the DMRS is transmitted on a specific antenna port among the plurality of antenna ports and positioned on one or two time axis symbols which are the same as at least one another DMRS transmitted on another antenna port among the plurality of antenna ports.

13. The terminal of claim 10 , wherein a DMRS sequence for generating the DMRS is generated by the cyclic shift code, the orthogonal cover code, and a base sequence.

14. The terminal of claim 13 , wherein, based on the cyclic shift code being w freq,p (k′), the orthogonal cover code being w time,p (l′), and the base sequence being r(k″), the DMRS sequence a k,l (p) is generated by one of two following equations:

a k,l (p) =w time,p ( l ′)· w freq,p ( k ′)· r ( k ″), or

a k,l (p) =w time,p ( l ′)· w freq,p ( k ′)· r ( k″,l ″).

15. The terminal of claim 13 , wherein the base sequence is generated in units of one OFDM symbol.

16. The terminal of claim 13 , wherein the base sequence is initialized by an index of the OFDM symbol.

17. The terminal of claim 10 ,

wherein the processor performs a channel estimation procedure for estimating a channel for receiving the data by using the DMRS, and

wherein the channel estimation procedure is performed by using a cyclic shift characteristic by the cyclic shift code.

18. The terminal of claim 10 ,

wherein the cyclic shift code is a Discrete Fourier Transform (DFT) code, and

wherein the orthogonal cover code is a Walsh-Hadamard code.