构造CDR标准中LDPC码的偏移矩阵法  

Construction of Parity Check Matrix of Low Density Parity Check Codes Based on CDR

作　　者：陈冬英[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《电声技术》2015年第9期87-90,共4页Audio Engineering

摘　　要：为构造调频频段数字音频广播(CDR)标准中LDPC码,提出了一种偏移矩阵构造法。该方法根据CDR标准中LDPC码的码长和码率有限,及其校验矩阵有准双对角线的特性,在高斯消元的基础上生成偏移因子构造LDPC码。该方法不仅加快搜索速度,并使其具有准循环与随机的特性。理论分析及仿真的结果表明:降低了构造LDPC码校验矩阵时计算的内存需求,计算复杂度也大大低于高斯消元构造法,且在10-4误码率下比高斯消元法有大约1.5 d B的编码增益,3 d B信噪比误码率达10-6级。To construct the structure of LDPC code in Frequency Modulation - China Digital Radio （CDR） , a new construction method based on excursion matrix is proposed. This method generates offset factor in Gaussian elimination basis due to the code lengths and code rates of LDPC codes are limited, and has dual - diagonal parity structure, which accelerates the speed of the search, and has quasi - cyclic with random characteristic. The simulation results show that the memory requirement and complexity is reduced, which is significantly lower than the Gaussian elimination construction method. Contrasted with Gaussian elimination construction method, it achieves about 1.5 dB coding gained at 10 -4 bits error rate and 10-6bits error rate at 3 dB.

关 键 词：调频频段数字音频广播 低密度奇偶校验码 偏移矩阵 准双对角线 

分 类 号：TN911.22[电子电信—通信与信息系统]