Design of decoder for LDPC codes used in CDTTB standard
国数字地面电视标准中LDPC码的半并行译码结构设计*

Quasi-cyclic low-density parity-check codes (QC-LDPC) have been adopted as the inner code of channel codes in Chinese digital terrestrial television broadcasting standard (CDTTB).Based on its systematic circulant form, this paper pre-sented a simplified min-sum decoding algorithm based on aposteriori probabilities and its corresponding decoder with semi-parallel architecture. The decoding of LDPC codes at multiple rates can be achieved in one receiver. With fully multiplexing the hardware resources are reduced on the premises that the payload rates are met. The properties of the decoder are verified on FPGA.