Codes Associated with $O^+(2n,2^r)$ and Power Moments of Kloosterman Sums

Details Codes Associated with $O^+(2n,2^r)$ and Power Moments of Kloosterman Sums Codes Associated with $O^+(2n,2^r)$ and Power Moments of Kloosterman Sums

2008-07-29

arxiv.org/abs/0807.4671v1

Mathematics

Number Theory

Scientific paper

In this paper, we construct three binary linear codes $C(SO^+(2,q))$, $C(O^+(2,q))$, $C(SO^+(4,q))$, respectively associated with the orthogonal groups $SO^+(2,q)$, $O^+(2,q)$, $SO^+(4,q)$, with $q$ powers of two. Then we obtain recursive formulas for the power moments of Kloosterman and 2-dimensional Kloosterman sums in terms of the frequencies of weights in the codes. This is done via Pless power moment identity and by utilizing the explicit expressions of Gauss sums for the orthogonal groups. We emphasize that, when the recursive formulas for the power moments of Kloosterman sums are compared, the present one is computationally more effective than the previous one constructed from the special linear group $SL(2,q)$. We illustrate our results with some examples.

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