作　　者： ; ; ;

机构地区： 杭州电子科技大学通信工程学院

出　　处： 《通信学报》 2010年第S1期117-121,共5页

摘　　要： 针对准循环低密度奇偶校验(QC-LDPC)码中准循环子矩阵的循环移位系数确定问题,提出基于Z形结构及等差数列结构的确定方法。该方法中,循环移位系数由简单的数学表达式确定,其对应的校验矩阵中无长度为4的短环。仿真结果显示在经典BP译码算法下,所提方法构造的LDPC码在误比特率为10?4时,信噪比优于DVB-S2中LDPC码接近0.4dB;同时,在相同条件下新方法构造的码字误码性能不亚于Mackay随机码。 For the issue of determining cyclic shift coefficients of the quasi-cyclic sub-matrix in the quasi-cyclic low den-sity parity check,a method was presented based on Z-shape and arithmetic progression sequence to compute the cyclic shift coefficients.By this method,cyclic shift coefficients could be expressed in simple analytic expressions,and cycles of length four in parity matrix were eliminated.Simulations show that,under the classing BP decoding algorithm,the SNR of the LDPC codes with the proposed algorithm is better than the LDPC codes in DVB-S2 close to 0.4dB at the BER performance of 10?4.Futhermore,the BER performance of the new codes is no less than the Mackay random codes under the same conditions.

关 键 词： 码 形 等差数列 循环移位系数

领　　域： [电子电信] [电子电信]