Method and apparatus for transmitting and receiving reference signals in a wireless communication system

A user equipment performing phase tracking in a wireless communication system, the user equipment comprising:

• a communication unit transmitting and receiving radio signals to and from an outside;
• and
• a processor functionally coupled to the communication unit,
• wherein the processor is configured to:
• receive a first demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS) from a base station,
• wherein the phase tracking reference signal is mapped to at least one OFDM symbol at constant symbol intervals based on a specific pattern;
• and
• perform the phase tracking for demodulation of data based on at least one of the first demodulation reference signal or the phase tracking reference signal,
• wherein the PTRS is mapped to symbols between the first OFDM symbol and the second OFDM symbols with reference to the first OFDM symbol and mapped to symbols after the second OFDM symbol with reference to the second OFDM symbol, when a first OFDM symbol with the first DMRS mapped thereto is positioned ahead of a second OFDM symbol with a second DMRS mapped thereto on the time axis.