首先介绍了LDPC码的校验矩阵和其因子表示方法，然后利用二分图对和积解码算法进行了详细的描述，最后给出了信度传播概率译码算法详细步骤，并对关键公式作了证明-This paper,first introduces the check matrix and the factor graph of LDPC,then describes the sum-product algorithm by using the factor graph,and finally presents the deta

采用全流水线结构，供初学者参考，附有仿真波形图，代码中上有可以改进之处，如蝶形单元中可以将4次乘法简化为3次乘法，不过要预先对旋转因子做处理，第一次上传，如有不妥之处，还请大家指正，谢谢。 -With full pipeline structure, reference for beginners, with a simulation waveform diagram, the code can be on improvements, such as the butterfly unit

1024点FFT的VHDL程序，含碟形图，旋转因子存储及产生代码，最后是VHDL整体设计，quartus ii编译环境-1024-point FFT VHDL program, including dish-shaped figure, twiddle factor , last VHDL overall design, Quartus ii compile environment