A method of receiving, by a user equipment, UE, a phase tracking reference signal, PT-RS, in a wireless communication system, the method comprising: determining, among a plurality of resource blocks that are sequentially numbered according to first indices, N resource blocks that are allocated to the UE, wherein the N resource blocks are sequentially numbered from 0 to N-1 according to second indices that are different from the first indices, where N is a natural number; determining, among the N resource blocks allocated to the UE, one or more resource blocks having subcarriers to which the PT-RS is mapped; and receiving the PT-RS via the one or more resource blocks, characterized in that determining the one or more resource blocks having subcarriers to which the PT-RS is mapped is based on i) a first value related to a frequency density of the PT-RS, ii) a scheduled bandwidth for the UE, and iii) a second value related to a resource block offset representing a lowest resource block to which the PT-RS is mapped, wherein the first value is determined from among different values for a plurality of non-overlapping ranges of scheduled bandwidths based on the scheduled bandwidth including the N resource blocks allocated to the UE, wherein the plurality of non-overlapping ranges of scheduled bandwidths includes a first range of 0 to a first predetermined bandwidth for which no PT-RS is present, wherein the plurality of non-overlapping ranges of scheduled bandwidths includes at least a second range of the first predetermined bandwidth to a second bandwidth for which a value related to the frequency density of the PT-RS is predetermined and a third range of the second bandwidth to a third bandwidth for which a larger value than that for the second range is predetermined for a frequency density of the PT-RS, and wherein determining the one or more resource blocks having subcarriers to which the PT-RS is mapped further comprises: determining, among the second indices, one or more second indices i that correspond to the one or more resource blocks determined based on i) one or more non-negative integer multiples of a third value and ii) the second value, wherein the third value is obtained based on the first value and the scheduled bandwidth. determining, among a plurality of resource blocks that are sequentially numbered according to first indices, N resource blocks that are allocated to the UE, wherein the N resource blocks are sequentially numbered from 0 to N-1 according to second indices that are different from the first indices, where N is a natural number; determining, among the N resource blocks allocated to the UE, one or more resource blocks having subcarriers to which the PT-RS is mapped; and receiving the PT-RS via the one or more resource blocks, characterized in that determining the one or more resource blocks having subcarriers to which the PT-RS is mapped is based on i) a first value related to a frequency density of the PT-RS, ii) a scheduled bandwidth for the UE, and iii) a second value related to a resource block offset representing a lowest resource block to which the PT-RS is mapped, wherein the first value is determined from among different values for a plurality of non-overlapping ranges of scheduled bandwidths based on the scheduled bandwidth including the N resource blocks allocated to the UE, wherein the plurality of non-overlapping ranges of scheduled bandwidths includes a first range of 0 to a first predetermined bandwidth for which no PT-RS is present, wherein the plurality of non-overlapping ranges of scheduled bandwidths includes at least a second range of the first predetermined bandwidth to a second bandwidth for which a value related to the frequency density of the PT-RS is predetermined and a third range of the second bandwidth to a third bandwidth for which a larger value than that for the second range is predetermined for a frequency density of the PT-RS, and wherein determining the one or more resource blocks having subcarriers to which the PT-RS is mapped further comprises: determining, among the second indices, one or more second indices i that correspond to the one or more resource blocks determined based on i) one or more non-negative integer multiples of a third value and ii) the second value, wherein the third value is obtained based on the first value and the scheduled bandwidth. determining, among the second indices, one or more second indices i that correspond to the one or more resource blocks determined based on i) one or more non-negative integer multiples of a third value and ii) the second value, wherein the third value is obtained based on the first value and the scheduled bandwidth.