Construction of isodual codes from polycirculant matrices
Résumé
Double polycirculant codes are introduced here as a generalization of double circulant codes. When the matrix of the polyshift is a companion matrix of a trinomial, we show that such a code is isodual, hence formally self-dual. Numerical examples show that the codes constructed have optimal or quasi-optimal parameters amongst formally self-dual codes. Self-duality, the trivial case of isoduality, can only occur over F 2 in the double circulant case. Building on an explicit infinite sequence of irreducible trinomials over F 2 , we show that binary double polycirculant codes are asymptotically good.
Domaines
Mathématiques [math]
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Shi2020_Article_ConstructionOfIsodualCodesFrom.pdf (308.11 Ko)
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