LDPC码的完整的编译码，本科毕设要求参见标准测试模型，利用自然梯度算法，单径或多径瑞利衰落信道仿真，是国外的成品模型，IDW距离反比加权方法。-Complete codec LDPC code, Undergraduate complete set requirements refer to the standard test models, Use of natural gradient algorithm, Single path or multipath Rayleigh fading