Method and apparatus for transmitting and receiving signal using polar code in communication system

A method of processing a received signal, performed by a communication node, in a communication system, the method comprising:

• obtaining log likelihood ratio (LLR) value(s) by performing a demodulation operation on a plurality of modulation symbols included in a received signal;
• placing LLR value(s) associated with higher bits among bits constituting each of the plurality of modulation symbols in a first group among a plurality of groups;
• placing LLR value(s) associated with lower bits among the bits constituting each of the plurality of modulation symbols in a second group among the plurality of groups;
• generating an LLR sequence by performing a de-grouping operation on the first group and the second group;
• and
• obtaining a bit sequence by performing a polar decoding operation on the LLR sequence.

A communication node for performing a processing operation of a transmission signal in a communication system, the communication node comprising:

• a processor:
• a memory electronically communicating with the processor;
• and
• instructions stored in the memory,
• wherein when executed by the processor, the instructions cause the communication node to:
• group a coded bit sequence including a plurality of coded bits into a plurality of groups;
• compare indices of code bits belonging to a first group among the plurality of groups and indices of code bits belonging to a second group among the plurality of groups;
• configure the coded bits belonging to the first group as higher bits among bits constituting each modulation symbol based on a result of comparing the indices of the coded bits;
• configure the coded bits belonging to the second group as lower bits among the bits constituting each modulation symbol based on the result of comparing the indices of the code bits;
• and
• generate the each modulation symbol by using the higher bits and the lower bits.