this an implementation of ldpc encoder and decoder in matlab. generator matrix, parity check matrix and the chennel are implemented seperately. the bit error rate performance is estimated for the ldpc code -this is an implementation of ldpc encoder a

实现ldpc编码仿真和译码仿真，参数有接收码字，解调器输出，信道噪声标准差，校验矩阵，迭代次数-realise the encoder and decoder of ldpc,ceremeters include receiveword,sigma,check parity,IterNum