Method of receiving phase tracking reference signal by user equipment in wireless communication system and device for supporting same

A user equipment (UE) of receiving a phase tracking reference signal (PT-RS) in a wireless communication system, the UE comprising:

• a receiver;
• and
• a processor connected to the receiver,
• wherein the processor is configured to:
• determine one or more resource blocks to which the PT-RS is mapped among N resource blocks allocated to the UE;
• and
• receive the PT-RS via the one or more resource blocks,
• wherein the N resource blocks are consecutively indexed as second resource block indices from a resource block having a lowest index of first resource block indices to a resource block having a highest index of the first resource block indices,
• wherein the PT-RS is mapped to the one or more resource blocks having indices of the second resource block indices and the indices are determined based on a first value related to a frequency density of the PT-RS and a second value related to a resource block offset,
• wherein the first value is determined based on a scheduled bandwidth related with the N resource blocks allocated to the UE, and
• wherein N is a natural number.