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On the Residue Codes of Extremal Type II Z4-Codes of Lengths 32 and 40

In this paper, we determine the dimensions of the residue codes of extremal Type II Z4-codes for lengths 32 and 40. We demonstrate that every binary doubly even self-dual code of length 32 can be realized as the residue code of some extremal Type II Z4-code. It is also shown that there is a unique extremal Type II Z4-code of length 32 whose residue code has the smallest dimension 6 up to equivalence. As a consequence, many new extremal Type II Z4-codes of lengths 32 and 40 are constructed.

preprint2011arXivOpen access
Masaaki Harada
math.COmath.ITInformation Theory
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Masaaki Harada

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