利用大衍数列构造QC-LDPC码的方法

提出了一种基于大衍数列构造准循环低密度校验码的方法.该方法利用大衍数列固定项差对应的值单调递增的特点,构造出的校验矩阵不含有长度为4的环,具有准循环结构,节省了校验矩阵的存储空间.仿真表明,取10-5误码率,在高斯白噪声信道和瑞利衰落信道下,基于大衍数列构造的准循环低密度奇偶校验(QC-LDPC)码比基于斐波那契数列构造的QC-LDPC码有接近1dB的增益;在高斯白噪声信道下,基于大衍数列构造的QC-LDPC码比阵列低密度奇偶校验码有接近3dB的增益.

Method for constructing QC-LDPC codes using the dayan sequence

For the purpose of constructing a channel coding solution with excellent performance,we present a method to construct Quasi-Cyclic Low-Density Parity-Check Codes based on the Dayan Sequence by analysing its characteristic.By making use of the feature that the fixed sequence difference in the Dayan Sequence has a steady increase value,this method is used to construct a parity check matrix that has no circle of length four,with the structure of quasi cyclic,and needs little storage space.Simulation results show that,under 10-5BER,in the Additive White Gaussian Noise channel and Rayleigh fading channel,QC-LDPC based on the Dayan Sequence has a gain nearly 1 dB more than that by QC-LDPC based on the Fibonacci Sequence.Also,in the Additive White Gaussian Noise channel,it has a gain almost 3 dB more than that by array LDPC.