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为了简化中国数字电视地面广播(DTTB)标准的信道解码,提出了一种三码率合一的准循环低密度奇偶校验(QC-LDPC)译码器,利用了3种码率QC-LDPC码的结构和参数特点。该译码器采用简化的译码流程、新颖的多码率复用模式和半并行的译码结构,已成功应用于符合中国DTTB标准的接收机芯片设计。仿真和测试结果表明,该译码器在加性白色G auss噪声信道下的误码性能与单码率译码器误码性能相当。硬件实现结果表明,该译码器的资源利用率远远超过了传统的单码率译码器。该译码器结构适用于各种QC-LDPC译码器的简化设计。
In order to simplify the channel decoding of the DTTB standard in China, a quasi-cyclic low-density parity-check (QC-LDPC) decoder with three codes rate is proposed. Three kinds of code rate QC-LDPC Code structure and parameters of the characteristics. The decoder uses a simplified decoding process, a novel multi-rate multiplexing mode and a semi-parallel decoding structure, has been successfully applied to meet China DTTB standard receiver chip design. The simulation and test results show that the error performance of this decoder under the additive white G auss noise channel is equivalent to that of the single code rate decoder. The hardware implementation results show that the decoder’s resource utilization far exceeds the traditional single-rate decoder. The decoder architecture is suitable for the simplified design of various QC-LDPC decoders.