线性码的数学基础 Theorem 8.7 Let H E Mmxn(Z2)be a canonical parity-check matrix.Then Null(H)consists of all x EZ3 whose first n-m bits are arbitrary but whose last m bits are determined by Hx=0.Each of the last m bits serves as an even parity check bit for some of the first n-m bits.Hence,H gives rise to an (n,n -mh)-block code. Codeword Gx Codeword 这n-m位可以表达什么？ 000000 Gx 00101 000000 001h01 这m位如何进行奇偶校验的？ 01d110 011011 010110 011011 取决于A矩阵和待编码信息！ 100011 101h10 100011 11d101 101h10 111000 11h01 111000线性码的数学基础 这n-m位可以表达什么？ 这m位如何进行奇偶校验的？ 取决于A矩阵和待编码信息！