LDPC码是Low Density Parity-check Codes的缩写，一个长为N的LDPC码由它的校验矩阵H来定义，该矩阵的特点是其中的元素0特别多，1特别少——即所谓的“低密度”。一个参数为（N，i，j）的H表示该矩阵中每列有i个1，每行有j个1，矩阵大小为N×K，N代表码字长度，K代表校验子的个数。 -LDPC code is the ab. of Low Density Parity-check Codes. A Length N LDPC is defined by its

In this example we show OFDM system perform over fading channel. The simulation results will be checked with ones we obtain through theoretical analysis. Full channel state information is used to detect data.-In this example we show how OFDM system p