A method for receiving a Reference Signal, RS, in a wireless communication system, the method performed by a User Equipment, UE, comprising: receiving, from a base station, Downlink Control Information, DCI; receiving, from the base station, a Demodulation RS, DMRS, and downlink data based on the DCI, wherein the DMRS and the downlink data are transmitted, from the base station to the UE, based on one or more antenna ports; and demodulating the downlink data based on the DMRS, characterized in that the downlink data is received in a same Orthogonal Frequency Division Multiplexing, OFDM, symbol as the DMRS or in different OFDM symbols with each other based on a number of OFDM symbols related to the downlink data, wherein the DMRS is multiplexed with the downlink data in the same OFDM symbol based on that the number of OFDM symbols related to the downlink data is equal to or smaller than a certain number, wherein a type of the DMRS is related to a number of combs that represent resource elements related to the one or more antenna ports and is a DMRS type 1 whose the number of combs is two, wherein the DMRS type is related to a specific order for an application of multiplexing methods related to the one or more antenna ports, wherein the specific order is configured such that: a frequency-code division multiplexing, F-CDM, is used first and a frequency division multiplexing, FDM, is used next as a number of antenna ports based on the DMRS type increases, wherein, based on whether the DMRS is multiplexed with the downlink data in the same OFDM symbol, a transmission power of the DMRS is determined to be a power boosted by 0 dB or 3 dB in comparison with a transmission power of the downlink data, wherein the transmission power of the DMRS is determined to be a power boosted by 0 dB in comparison with the transmission power of the downlink data, based on that the DMRS is multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or smaller than two, wherein the transmission power of the DMRS is determined to be a power boosted by 3 dB in comparison with the transmission power of the downlink data, based on that the DMRS is not multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or greater than three. receiving, from a base station, Downlink Control Information, DCI; receiving, from the base station, a Demodulation RS, DMRS, and downlink data based on the DCI, wherein the DMRS and the downlink data are transmitted, from the base station to the UE, based on one or more antenna ports; and demodulating the downlink data based on the DMRS, characterized in that the downlink data is received in a same Orthogonal Frequency Division Multiplexing, OFDM, symbol as the DMRS or in different OFDM symbols with each other based on a number of OFDM symbols related to the downlink data, wherein the DMRS is multiplexed with the downlink data in the same OFDM symbol based on that the number of OFDM symbols related to the downlink data is equal to or smaller than a certain number, wherein a type of the DMRS is related to a number of combs that represent resource elements related to the one or more antenna ports and is a DMRS type 1 whose the number of combs is two, wherein the DMRS type is related to a specific order for an application of multiplexing methods related to the one or more antenna ports, wherein the specific order is configured such that: a frequency-code division multiplexing, F-CDM, is used first and a frequency division multiplexing, FDM, is used next as a number of antenna ports based on the DMRS type increases, wherein, based on whether the DMRS is multiplexed with the downlink data in the same OFDM symbol, a transmission power of the DMRS is determined to be a power boosted by 0 dB or 3 dB in comparison with a transmission power of the downlink data, wherein the transmission power of the DMRS is determined to be a power boosted by 0 dB in comparison with the transmission power of the downlink data, based on that the DMRS is multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or smaller than two, wherein the transmission power of the DMRS is determined to be a power boosted by 3 dB in comparison with the transmission power of the downlink data, based on that the DMRS is not multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or greater than three. a frequency-code division multiplexing, F-CDM, is used first and a frequency division multiplexing, FDM, is used next as a number of antenna ports based on the DMRS type increases, wherein, based on whether the DMRS is multiplexed with the downlink data in the same OFDM symbol, a transmission power of the DMRS is determined to be a power boosted by 0 dB or 3 dB in comparison with a transmission power of the downlink data, wherein the transmission power of the DMRS is determined to be a power boosted by 0 dB in comparison with the transmission power of the downlink data, based on that the DMRS is multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or smaller than two, wherein the transmission power of the DMRS is determined to be a power boosted by 3 dB in comparison with the transmission power of the downlink data, based on that the DMRS is not multiplexed with the downlink data in the same OFDM symbol and the number of the one or more antenna ports is equal to or greater than three.