Transitive and Self-dual Codes Attaining the Tsfasman-Vladut-Zink Bound

Details Transitive and Self-dual Codes Attaining the Tsfasman-Vladut-Zink Bound Transitive and Self-dual Codes Attaining the Tsfasman-Vladut-Zink Bound

2005-06-14

arxiv.org/abs/math/0506264v1

Mathematics

Algebraic Geometry

17 pages

Scientific paper

We introduce - as a generalization of cyclic codes - the notion of transitive codes, and we show that the class of transitive codes is asymptotically good. Even more, transitive codes attain the Tsfasman-Vladut-Zink bound over F_q, for all aquares q=l^2. We also show that self-orthogonal and self-dual codes attain the Tsfasman-Vladut-Zink bound, thus improving previous results about self-dual codes attaining the Gilbert-Varshamov bound. The main tool is a new asymptotically optimal tower (E_n) of function fields over F_q where all extensions E_n/E_0 are Galois.

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