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Technologies des réseaux de communication - UVT e-doc ...

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● co<strong>de</strong> Ethernet, polynôme générateur H(z) = z 32 + z 26 + z 23 + z 22 + z 16 + z 12 + z 11 + z 10 + z 8 + z 7 + z 5 +<br />

z 4 + z 2 + z + 1<br />

cas particulier : Un co<strong>de</strong> cyclique est un co<strong>de</strong> polynomial (n,m) tel que son polynôme générateur H(z) divise<br />

z n + 1<br />

z n + 1 = H(z)Ω(z)<br />

où Ω(z) est un polynôme <strong>de</strong> <strong>de</strong>gré n. Les co<strong><strong>de</strong>s</strong> cycliques possè<strong>de</strong>nt la propriété fondamentale suivante : une<br />

permutation circulaire d'un mot du co<strong>de</strong> est un mot du co<strong>de</strong>.<br />

Exercices et tests : Exercice 22, Exercice 23, Exercice 24, Exercice 25, Exercice 26, Exercice 27,<br />

Exercice 28, Exercice 29, Exercice 30, Exercice 31, QCM24, QCM25, QCM26, QCM27, QCM28, QCM29,<br />

QCM30<br />

Gérard-Michel Cochard

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