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A Basis for all Solutions of the Key Equation for Gabidulin Codes

We present and prove the correctness of an efficient algorithm that provides a basis for all solutions of a key equation in order to decode Gabidulin (G-) codes up to a given radius tau. This algorithm is based on a symbolic equivalent of the Euclidean Algorithm (EA) and can be applied for decoding of G-codes beyond half the minimum rank distance. If the key equation has a unique solution, our algorithm reduces to Gabidulin's decoding algorithm up to half the minimum distance. If the solution is not unique, we provide a basis for all solutions of the key equation. Our algorithm has time complexity O(tau^2) and is a generalization of the modified EA by Bossert and Bezzateev for Reed-Solomon codes.

preprint2010arXivOpen access
Antonia WachterVladimir SidorenkoMartin Bossert
math.ITInformation Theory
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Antonia WachterVladimir SidorenkoMartin Bossert

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