Abstract

A construction of cyclic codes in which an "inner" cyclic code is concatenated with appropriately chosen "outer" cyclic codes is presented. An example of the construction that improves on BCH codes of low rate is provided. Conversely, any cyclic code of length <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n_1 n_2</tex> can be constructed by this construction, where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n_1</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n_2</tex> are relatively prime.

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