Transmitter and puncturing method thereof

A puncturing method of a transmitter, comprising:

• encoding input bits including outer encoded bits and zero bits to generate parity bits;
• and
• puncturing some of the parity bits,
• wherein the puncturing calculates the number of parity bits to be punctured based on Npunc_temp calculated based on a following equation:
• Npunc_temp=└A×(Kldpc−Nouter)┘+B,
• where Npunc_temp represents a temporary number of parity bits to be punctured, Nouter represents the number of the outer-encoded bits, Kldpc represents the number of the LDPC information bits comprising the outer-encoded bits and zero bits, and A and B represent predetermined constants
• at least one of the A and B is determined as different value corresponding to different robustness levels at the same modulation order.

A transmitter, comprising:

• an LDPC encoder configured to encode input bits including zero bits to generate parity bits;
• and
• a puncturer configured to puncture some of the parity bits,
• wherein the puncturer calculates the number of punctured parity bits based on Npunc_temp calculated based on a following equation:
• Npunc_temp=B,
• where the Npunc_temp represents a temporary number of parity bits to be punctured and B represents predetermined constant, and B is determined as different value at different modulation orders.