面向中国DTTB标准的多码率LDPC译码器  

Multi-rate LDPC decoder for the Chinese DTTB standard

作　　者：彭克武[1] 牛迪民[2] 宋健[1] 杨知行 

机构地区：[1]清华大学清华信息科学与技术国家实验室,北京100084 [2]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第10期1712-1716,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：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。A three-rate quasi-cyclic LDPC decoder was developed for channel decoding for the Chinese Digital Television Terrestrial Broadcasting （DTTB） standard. The decoder fully exploits the quasi-cyclic property and similarities among the three single-rate LDPC codes. The decoder, which incorporates simplified decoding steps, efficiently reuses storage space and functional units in a semi-parallel structure. The decoder has been successfully deployed in a receiver-chip design for the Chinese DTTB standard. Performance simulations show that there is no difference in the decoding performance between multi-rate and single-rate decoders in terms of bit error rate for various signal to noise ratios over AWGN channels. Hardware implementation results show that the resource efficiency of the multi-rate decoder is much better than that of traditional single-rate decoders. Thus high-efficient LDPC decoder simplifies the multi rate QC-LDPC decoder, as demonstrated by simulations and implementation results.

关 键 词：数字电视地面广播(DTTB) 低密度奇偶校验(LDPC) 多码率译码器 

分 类 号：TN911.22[电子电信—通信与信息系统]