两种特殊的矩阵 A is the m×(n-m)matrix Im is the m x m identity matrix a11 a12 al,n-m a21 a22 a2.n-m aml am2 am.n-m canonical parity-check matrix standard generator matrix H=(A Im) -( H是mxn矩阵；G是x(m-m矩阵两种特殊的矩阵 H是mn矩阵; G是n(n-m)矩阵