Parity check for decoding QC-LDPC codes with all-diagonal parity-check structure

A parity-check method is proposed for decoding a class of quasi-cyclic low-density parity-check (QC-LDPC) codes with all-diagonal parity-check structure. Through Chinese Digital Terrestrial Television Multimedia Broadcasting (DTMB) standard, we show that the proposed method has high speed and is easy to implement.