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

An operation method of a first communication node in a communication system, the operation method comprising:

• generating a first sequence;
• generating a second sequence;
• generating a first signal sequence based on the first sequence and the second sequence;
• and
• transmitting a first signal generated by modulating the first signal sequence,
• wherein even-numbered elements and odd-numbered elements among elements corresponding to a first range in the first signal sequence are classified as a first element group and a second element group, respectively, even-numbered elements and odd-numbered elements among elements corresponding to a second range in the first signal sequence are classified as a third element group and a fourth element group, respectively, the first sequence is mapped in ascending and descending order in the first and fourth element groups, and the second sequence is mapped in ascending and descending order in the third and fourth element groups.

A first communication node in a communication system, comprising a processor, wherein the processor causes the first communication to perform:

• generating a first sequence;
• generating a second sequence;
• generating a first signal sequence based on the first sequence and the second sequence;
• and
• transmitting a first signal generated by modulating the first signal sequence,
• wherein even-numbered elements and odd-numbered elements among elements corresponding to a first range in the first signal sequence are classified as a first element group and a second element group, respectively, even-numbered elements and odd-numbered elements among elements corresponding to a second range in the first signal sequence are classified as a third element group and a fourth element group, respectively, the first sequence is mapped in ascending and descending order in the first and fourth element groups, and the second sequence is mapped in ascending and descending order in the third and fourth element groups.