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Thu, 07 Feb 2008 10:08:37 +0200Thu, 07 Feb 2008 10:08:37 +0200Double and bordered alpha-circulant self-dual codes over finite commutative chain rings
http://opus4.kobv.de/opus4-ubbayreuth/frontdoor/index/index/docId/395
In this paper we investigate codes over finite commutative rings R, whose generator matrices are built from alpha-circulant matrices. For a non-trivial ideal I < R we give a method to lift such codes over R/I to codes over R, such that some isomorphic copies are avoided. For the case where I is the minimal ideal of a finite chain ring we refine this lifting method: We impose the additional restriction that lifting preserves self-duality. It will be shown that this can be achieved by solving a linear system of equations over a finite field. Finally we apply this technique to Z_4-linear double nega-circulant and bordered circulant self-dual codes. We determine the best minimum Lee distance of these codes up to length 64.Michael Kiermaier; Alfred Wassermannarticlehttp://opus4.kobv.de/opus4-ubbayreuth/frontdoor/index/index/docId/395Wed, 02 Jul 2008 10:08:37 +0200