Effective Puncturing Schemes for Block-type Low-Density Parity-Check Codes

In this paper, a puncturing method for block-type rate-compatible low-density parity-check (LDPC) codes with ´good´ performance is proposed. Puncturing is a scheme to obtain a series of higher rate codes from a low rate mother code. It is widely used in channel coding but it causes performance loss compared with non-punctured error correcting codes at the same rate. There have been many researches about puncturing to reduce the performance loss. However, these researches are not optimized for specific types such as block-type LDPC (B-LDPC) codes adopted in IEEE 802.16e standards. B-LDPC codes are constructed as irregular quasi-cyclic LDPC (QC-LDPC) codes for reduced required memory size and efficient encoding. In this paper, we suggest a modified puncturing scheme which is optimized for B-LDPC codes and compare the performance with previous scheme.