DTMB标准LDPC码译码算法分析与改进  

Analysis and improvement of LDPC decoding algorithm in DTMB

作　　者：龚莹莹[1] 聂明新[1] 焦金良[2] 

机构地区：[1]武汉理工大学信息学院,湖北武汉430070 [2]上海明波通信技术有限公司,上海201203

出　　处：《电视技术》2008年第z1期4-5,24,共3页Video Engineering

摘　　要：在置信传播算法的基础上提出了一种新LDPC译码算法,采用串行消息传递机制,且对校验节点更新运算进行了简化,提高了译码收敛速度,并降低了译码复杂度。通过对应用于DTMB标准中的LDPC码进行性能仿真,结果表明改进后的译码算法在BER=3×10-6处译码性能比传统的BP算法劣化不到0.1dB,而译码的平均迭代次数要减少50%。A new LDPC decoding algorithm based on BP is present algorithm. The new algorithm uses Serial Schedule Message Passing and reduces the complexity of the Check-Node Update operation, not only improve convergence property but also reduces the decoding complexity. This paper simulates the performance of different algorithm of LDPC codes in DTMB, simulation results show that the new algorithm performs less than 0.1 dB worse than BP algorithm at the BER=3×10-6, and its average iteration number can be reduced to 50%.

关 键 词：低密度校验码 GB 0600-2006 消息传递机制 校验节点更新 

分 类 号：TN919.3+2[电子电信—通信与信息系统]