Further improvements on asymptotic bounds for codes using distinguished divisors

  • Authors:
  • Harald Niederreiter;Ferruh ÖZbudak

  • Affiliations:
  • Department of Mathematics, National University of Singapore, 2 Science Drive 2, Singapore 117543, Republic of Singapore;Department of Mathematics, Middle East Technical University, İnönü Bulvarı, 06531 Ankara, Turkey

  • Venue:
  • Finite Fields and Their Applications
  • Year:
  • 2007

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Abstract

For a prime power q, let @a"q be the standard function in the asymptotic theory of codes, that is, @a"q(@d) is the largest asymptotic information rate that can be achieved for a given asymptotic relative minimum distance @d of q-ary codes. In recent years the Tsfasman-Vladut-Zink lower bound on @a"q(@d) was improved by Elkies, Xing, and Niederreiter and Ozbudak. In this paper we show further improvements on these bounds by using distinguished divisors of global function fields.