A deterministic reduction for the gap minimum distance problem: [extended abstract]

  • Authors:
  • Qi Cheng;Daqing Wan

  • Affiliations:
  • The University of Oklahoma, Norman, OK, USA;University of California, Irvine, CA, USA

  • Venue:
  • Proceedings of the forty-first annual ACM symposium on Theory of computing
  • Year:
  • 2009

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Abstract

Determining the minimum distance of a linear code is one of the most important problems in algorithmic coding theory. The exact version of the problem was shown to be NP-complete in [14]. In [8], the gap version of the problem was shown to be NP-hard for any constant factor under a randomized reduction. It was shown in the same paper that the minimum distance problem is not approximable in randomized polynomial time to the factor 2log1-ε n unless NP ⊆ RTIME(2polylog(n)). In this paper, we derandomize the reduction and thus prove that there is no deterministic polynomial time algorithm to approximate the minimum distance to any constant factor unless P=NP. We also prove that the minimum distance is not approximable in deterministic polynomial time to the factor 2log1-εn unless NP ⊆ DTIME(2polylog(n)). As the main technical contribution, for any constant 2/3