Weighted Generating Functions for Type II Lattices and Codes
Abstract
We give a new structural development of harmonic polynomials on Hamming space, and harmonic weight enumerators of binary linear codes, that parallels one approach to harmonic polynomials on Euclidean space and weighted theta functions of Euclidean lattices. Namely, we use the finitedimensional representation theory of sl_2 to derive a decomposition theorem for the spaces of discrete homogeneous polynomials in terms of the spaces of discrete harmonic polynomials, and prove a generalized MacWilliams identity for harmonic weight enumerators. We then present several applications of harmonic weight enumerators, corresponding to some uses of weighted theta functions: an equivalent characterization of tdesigns, the AssmusMattson Theorem in the case of extremal Type II codes, and configuration results for extremal Type II codes of lengths 8, 24, 32, 48, 56, 72, and 96.
 Publication:

arXiv eprints
 Pub Date:
 November 2011
 arXiv:
 arXiv:1111.2392
 Bibcode:
 2011arXiv1111.2392E
 Keywords:

 Mathematics  Number Theory;
 Mathematics  Combinatorics;
 94B05 (Primary) 05B05;
 11H71;
 33C50;
 33C55 (Secondary)
 EPrint:
 34 pages