LDPC码的错误平层研究

摘要

In order to study LDPC codes error floor phenomenon, this paper proposed a method using importance sampling method. In the AWGN channel, when the bit error rate was very low, compared to the traditional Monte Carlo method, the proposed method achieved higher simulation gain, with the same simulation quality. The method could also simulate the area which could not be simulated using the traditional Monte Carlo method. The simulation results show that, for a code length equal to 2 000, code rate equal to I / 2 LDPC code word, when the bit error rate of 10 -20, the proposed method achieves more than 1014 simulation gain.%为了更好地研究LDPC码的错误平层现象,提出了一种利用重要抽样信息的仿真方法.在AWGN信道下,当误比特率极低时,该方法相比于传统的蒙特卡罗算法在保证仿真质量不变的情况下,取得了极高的仿真增益.利用该方法可以仿真到传统蒙特卡罗方法无法仿真到的仿真区域.仿真结果表明.对于一个码长为2 000,码率为1/2的LDPC码字,当误比特率为10时,该方法取得10以上的仿真增益.