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Open Access

Iterative List Decoding of Concatenated Source-Channel Codes

EURASIP Journal on Advances in Signal Processing20052005:267126

Received: 6 October 2003

Published: 15 May 2005


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.

Keywords and phrases

joint source-channel codingvariable length codeslist decodingiterative decoding

Authors’ Affiliations

Multimedia Communications Laboratory, The University of Texas at Dallas, USA


© Hedayat and Nosratinia 2005