# American Institute of Mathematical Sciences

November  2010, 4(4): 579-596. doi: 10.3934/amc.2010.4.579

## On dual extremal maximal self-orthogonal codes of Type I-IV

 1 Lehrstuhl D für Mathematik, RWTH Aachen University, Templergraben 64, 52062 Aachen, Germany

Received  February 2010 Revised  September 2010 Published  November 2010

For a Type $T \in${I, II, III, IV} of codes over finite fields and length $N$ where there exists no self-dual Type $T$ code of length $N$, upper bounds on the minimum weight of the dual code of a self-orthogonal Type $T$ code of length $N$ are given, allowing the notion of dual extremal codes. It is proven that for $T \in${II, III, IV} the Hamming weight enumerator of a dual extremal maximal self-orthogonal Type $T$ code of a given length is unique.
Citation: Annika Meyer. On dual extremal maximal self-orthogonal codes of Type I-IV. Advances in Mathematics of Communications, 2010, 4 (4) : 579-596. doi: 10.3934/amc.2010.4.579
##### References:
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show all references

##### References:
 [1] C. Bachoc and P. Gaborit, Designs and self-dual codes with long shadows,, J. Combin. Theory, 105 (2004), 15.  doi: 10.1016/j.jcta.2003.09.003.  Google Scholar [2] J. H. Conway and N. J. A. Sloane, A new upper bound on the minimal distance of self-dual codes,, IEEE Trans. Inform. Theory, 36 (1990), 1319.  doi: 10.1109/18.59931.  Google Scholar [3] P. Gaborit, A bound for certain s-extremal lattices and codes,, Arch. Math. (Basel), 89 (2007), 143.   Google Scholar [4] A. M. Gleason, Weight polynomials of self-dual codes and the MacWilliams identites,, in, 3 (1971), 211.   Google Scholar [5] W. C. Huffman and V. Pless, "Fundamentals of Error-Correcting Codes,", Cambridge University Press, (2003).   Google Scholar [6] G. Nebe, E. M. Rains and N. J. A. Sloane, "Self-Dual Codes and Invariant Theory,", Springer, (2006).   Google Scholar [7] M. Ozeki, On intersection properties of extremal ternary codes,, J. Math. Industry, 1 (2009), 105.   Google Scholar [8] V. Pless, W. C. Huffman and R. A. Brualdi (eds.), "Handbook of Coding Theory,", North-Holland, (1998).   Google Scholar [9] V. Pless, N. J. A. Sloane and H. N. Ward, Ternary codes of minimum weight 6, and the classification of length 20,, IEEE Trans. Inform. Theory, 26 (1980), 305.  doi: 10.1109/TIT.1980.1056195.  Google Scholar [10] E. M. Rains, Shadow bounds for self-dual codes,, IEEE Trans. Inform. Theory, 44 (1998), 134.  doi: 10.1109/18.651000.  Google Scholar [11] W. Scharlau, Quadratic and Hermitian forms,, in, (1985).   Google Scholar [12] N. J. A. Sloane, Gleason's Theorem on self-dual codes and its generalizations,, preprint, ().   Google Scholar
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