基于LLRBP算法的LDPC译码研究

Research on LDPC Decoding Based on LLRBP Algorithm

本文在译码性能损失较小的条件下,提出一种改进型的LLRBP译码算法,在低信噪比条件下可将每次迭代的计算复杂度和译码迭代次数大幅降低,本文方法在低信噪比低于1. 51 dB的条件下,可将译码迭代次数大幅降低,在信噪比高于1. 51 dB时,与经典LLRBP算法相比,本文方法的迭代次数与其相差非常小,原因是在信噪比较高时,无需对检验因子是否达到稳定进行判决。

In this paper,an improved LLRBP decoding algoritlim is proposed under the condition of low decoding performance loss.In the condition of low SNR,the complexity of each iteration and the number of decoding iterations can be reduced greatly.In this paper,the number of decoding iterations can be reduced greatly when the low signal to noise ratio is lower than 1.51 dB,and the signal noise can be reduced in the signal to noise.Compared with the classical LLRBP algorithm,the number of iterations of this method is very small compared with the classic 1.51 dB.The reason is that when the signal-to-noise ratio is high,it is not necessary to decide whetiier tiie test factor is stable or not.