Method and apparatus for secure communication in wireless communication system

A method for receiving a security signal, performed by a first communication node in a communication system, the method comprising:

• estimating a radio channel between the first communication node and a second communication node;
• receiving a first control symbol from the second communication node;
• receiving a plurality of symbols from the second communication node through the radio channel;
• obtaining a first reference value from the first control symbol;
• classifying all subcarriers constituting the radio channel into a first subcarrier group in charge of transmitting a data signal and a second subcarrier group in charge of transmitting a jamming signal based on the first reference value and channel information of the radio channel;
• and
• obtaining the data signal by decoding symbols received through the first subcarrier group among the plurality of symbols.

A first communication node in a communication system, the first 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 first communication node to:
• estimate a radio channel between the first communication node and a second communication node;
• classify all resource elements constituting a resource block into a first resource element group in charge of transmitting a data signal and a second resource element group in charge of transmitting a jamming signal, based on channel information of the estimated radio channel;
• generate at least one data symbol by allocating the data signal to resource elements of the first resource element group;
• generate at least one jamming symbol by allocating the jamming signal to resource elements of the second subcarrier group;
• generate a first control symbol to which a first control signal is mapped, the first control signal including a first reference value used to restore the at least one data symbol at the second communication node;
• and
• transmit the at least one data symbol, the at least one jamming symbol, and the first control symbol to the second communication node.