Edge transitive ramanujan graphs and symmetric LDPC good codes

  • Authors:
  • Tali Kaufman;Alexander Lubotzky

  • Affiliations:
  • BIU, Ramat-Gan, Israel;HUJI, Jerusalem, Israel

  • Venue:
  • STOC '12 Proceedings of the forty-fourth annual ACM symposium on Theory of computing
  • Year:
  • 2012

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Abstract

We present the first explicit construction of a binary symmetric code with constant rate and constant distance (i.e., good code). Moreover, the code is LDPC and its constraint space is generated by the orbit of one constant weight constraint under the group action. Our construction provides the first symmetric LDPC good codes. In particular, it solves the main open problem raised by Kaufman and Wigderson {8}.