Data decoding method and device in communication and broadcast system

A first device of a communication system comprising:

• at least one processor;
• and
• memory storing instructions that, when executed by the at least one processor, cause the first device to:
• obtain an estimated bit sequence based on signals received from a second device,
• based on a decoding of the estimated bit sequence being unsuccessful, determine whether a specified condition for a code dimension is satisfied or not, the code dimension indicating a length of the estimated bit sequence,
• based on the specified condition being satisfied, obtain a modified bit sequence by inverting one bit in the estimated bit sequence, wherein a position of the one bit in the estimated bit sequence to be inverted is determined by the code dimension, and
• perform a cyclic redundancy check (CRC) for the modified bit sequence.

A non-transitory computer-readable storage medium comprising memory storing instructions that, when executed by a processor, cause a first electronic device to perform operations including:

• obtaining an estimated bit sequence based on signals received from a second device,
• based on a decoding of the estimated bit sequence being unsuccessful, determining whether a specified condition for a code dimension is satisfied or not, the code dimension indicating a length of the estimated bit sequence,
• based on the specified condition being satisfied, obtaining a modified bit sequence by inverting one bit in the estimated bit sequence, and
• performing a cyclic redundancy check (CRC) for the modified bit sequence,
• wherein a position of the one bit in the estimated bit sequence to be inverted is determined by the code dimension.