Abstract
Various methods for combining codes to obtain new ones have been described by MacWilliams and Sloane [10]. In this paper we present another method for combining algebraic geometric (a.g.) Goppa codes to construct new longer codes using function field extensions. We also prove that if one starts with an a.g. code with minimum distance better than expected, then the new code, obtained by this method, will also have minimum distance better than expected. Furthermore, we give an estimate on the improvement of the minimum distance of the new code.
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