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A novel algorithm, named Improved Protograph-based EXtrinsic Information Transfer (IP-EXIT), is proposed in this paper. With the proposed algorithm, quite accurate performance evaluations of Quasi-Cyclic LDPC (QC-LDPC) codes with arbitrary puncturing can be provided. LDPC codes combined with IR-HARQ technique have been a hot topic at present and puncturing is definitely one of the most efficient ways to achieve LDPC combined with HARQ. Unlike Turbo codes, different puncturing patterns for the same LDPC code may result in huge performance gap, so researchers are trying to design the puncturing pattern with better performance for LDPC codes.
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