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List-decoding of variable-length codes with application in joint source-channel coding

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2 Author(s)
Hedayat, A. ; Multimedia Commun. Lab., Texas Univ. at Dallas, Richardson, TX, USA ; Nosratinia, A.

The residual redundancy that remains, intentionally or unintentionally, in source-coded systems can be exploited by joint source-channel coding. This principle has been recently applied to variable-length encoded sequences via iterative decoding. This work improved on past results by proposing list-decoding for variable-length codes (VLCs) with the help of a non-binary outer CRC code. We show that the list Viterbi decoding of VLCs is beneficial, particularly for the redundant ones used in state-of-art video coding standards. For a concatenated VLC and channel code, we propose an approximated list-decoder. Since the feasible decoders for concatenated codes are iterative, this proposed list-decoder has as a subset the recently proposed iterative decoder of VLCs and channel codes. The introduced list-decoder improved the overall performance significantly in AWGN and Rayleigh fading channels even with a short list of L=2.

Published in:

Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on  (Volume:1 )

Date of Conference:

3-6 Nov. 2002