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Iterative List Decoding of Concatenated Source-Channel Codes


Whenever variable-length entropy codes are used in the presence of a noisy channel, any channel errors will propagate and cause significant harm. Despite using channel codes, some residual errors always remain, whose effect will get magnified by error propagation. Mitigating this undesirable effect is of great practical interest. One approach is to use the residual redundancy of variable length codes for joint source-channel decoding. In this paper, we improve the performance of residual redundancy source-channel decoding via an iterative list decoder made possible by a nonbinary outer CRC code. We show that the list decoding of VLC's is beneficial for entropy codes that contain redundancy. Such codes are used in state-of-the-art video coders, for example. The proposed list decoder improves the overall performance significantly in AWGN and fully interleaved Rayleigh fading channels.

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Correspondence to Ahmadreza Hedayat.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hedayat, A., Nosratinia, A. Iterative List Decoding of Concatenated Source-Channel Codes. EURASIP J. Adv. Signal Process. 2005, 267126 (2005).

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Keywords and phrases

  • joint source-channel coding
  • variable length codes
  • list decoding
  • iterative decoding