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Decompositions and extremal type II codes over Z4

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1 Author(s)
Huffman, W.C. ; Dept. of Math. Sci., Loyola Univ., Chicago, IL, USA

In previous work by Huffman and by Yorgov (1983), a decomposition theory of self-dual linear codes C over a finite field Fq was given when C has a permutation automorphism of prime order r relatively prime to q. We extend these results to linear codes over the Galois ring Z4 and apply the theory to Z4-codes of length 24. In particular we obtain 42 inequivalent [24,12] Z4-codes of minimum Euclidean weight 16 which lead to 42 constructions of the Leech lattice

Published in:

Information Theory, IEEE Transactions on  (Volume:44 ,  Issue: 2 )

Date of Publication:

Mar 1998

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