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Construction of Rate-Compatible LDPC Codes Utilizing Information Shortening and Parity Puncturing

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Abstract

This paper proposes a method for constructing rate-compatible low-density parity-check (LDPC) codes. The construction considers the problem of optimizing a family of rate-compatible degree distributions as well as the placement of bipartite graph edges. A hybrid approach that combines information shortening and parity puncturing is proposed. Local graph conditioning techniques for the suppression of error floors are also included in the construction methodology.

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Correspondence to Tao Tian.

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Keywords

  • rate compatibility
  • shortened codes
  • punctured codes
  • irregular low-density parity-check codes
  • density evolution
  • extrinsic message degree