CMMB标准中LDPC码的译码及定点仿真研究  

Study of the LDPC Decoding and the Fixed-point Simulation in CMMB

作　　者：窦戈[1] 朱钢[1] 王尤菁[1] 

机构地区：[1]南京航空航天大学大学电子信息工程学院,江苏南京210016

出　　处：《信息化研究》2011年第5期27-29,33,共4页INFORMATIZATION RESEARCH

摘　　要：针对CMMB标准中的LDPC码进行了译码算法的研究,提出最小的改进算法,同时给出归一化最小和算法的定点仿真。定点仿真结果表明,输入8位量化,中间变量分别9位和10位量化,可获得与浮点相差很小的误码率性能。In this paper, we research the decoding algorithms of the LDPC code in CMMB and propose an im- proved algorithm based on the Min-Sum algorithm. The simulation results indicate that the performance of the improved Min-Sum is much better than the MS algorithm and has a little degradation compared with the NMS algorithm in the case of relatively high SNR. And the improved algorithm is easier to be implemented. Moreover, the fixed-point simulation of the normalized rain-sum algorithm is also studied. The result shows that the BER performance only has a slight decline with the input 8 bit quantized and inner variable respectively 9 bit and 10 bit quantized. 6 bit quantization of the input and 8 bit quantization of the inner variable is also acceptable when the memory is sensitive.

关 键 词：LDPC码 CMMB标准 译码 仿真 定点 

分 类 号：TN911.22[电子电信—通信与信息系统]