Method and apparatus for channel encoding and decoding in communication or broadcasting system

A transmitter performing channel encoding in a communication system, the transmitter comprising:

• a controller configured to control to:
• perform low density parity check (LDPC) encoding for a bit sequence based on first information, the first information being identified based on second information and third information, and
• a transceiver configured to transmit the encoded bit sequence to a receiver,
• wherein the second information indicates information on non-zero blocks in the first information, and
• wherein the third information indicates information on values associated with the non-zero blocks.

A receiver performing channel decoding in a communication system, the receiver comprising:

• a transceiver configured to receive a signal from a transmitter;
• and
• a controller configured to:
• perform low density parity check (LDPC) decoding for a demodulated received signal based on first information, the first information being identified based on second information and third information, and
• wherein the second information indicates information on non-zero blocks in the first information, and
• wherein the third information indicates information on values associated with the non-zero blocks.