An efficient variable-length code construction foriterative source-channel decoding

  • Authors:

  • Ragnar Thobaben;Jörg Kliewer

  • Affiliations:

  • School of Electrical Engineering, ACCESS Linnaeus Center, Royal Institute of Technology (KTH), Stockholm, Sweden;Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM

  • Venue:
  • IEEE Transactions on Communications
  • Year:
  • 2009

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Abstract

We present a novel variable-length code (VLC) construction which exhibits an inherent error correcting capability due to the exclusive presence of codewords with even Hamming weight. Besides error robustness, the proposed code construction features a similar codeword length distribution as Golomb-Rice codes, and therefore, in particular for sources with exponentially distributed symbols, has good source compression properties at the same time. We show that in a source channel coding framework with outer source encoding, inner channel encoding with a recursive convolutional code, and iterative decoding the proposed VLC construction can lead to significant performance improvements compared to fixed-length source encoding with optimized mappings. In particular, simulation results for the AWGN channel verify that for Gauss-Markov sources a performance close to the theoretical limit can be achieved.