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IEEE Wireless Communications and Networking Conference

作者： Xie Tingjun Wang Xuan Lu Jianhua Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)9781424406586

In this paper, we propose a novel joint source-channel coding (JSCC) scheme that combines error resilient arithmetic codes (ERAC) and low-density parity-check (LDPC) codes. In the proposed scheme, the error detection capability of ERAC is exploited by the bit-interleaving technique to improve the performance of LDPC decoder, and the overall decoding performance. Simulation results show that the proposed approach achieves significant performance gains with respect to the separated decoding techniques, with additional advantage of high scalability and flexibility.

关键词： error resilient arithmetic coding joint source-channel coding (JSCC) low-density parity-check (LDPC) codes

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A syntax-preserving error resilience tool for JPEG 2000 based on error correcting arithmetic coding

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IEEE TRANSACTIONS ON IMAGE PROCESSING 2006年第4期15卷 807-818页

作者： Grangetto, M Magli, E Olmo, G Politecn Torino Dipartimento Elettron Ctr Multimedia Radio Commun I-10129 Turin Italy

JPEG 2000 is the novel ISO standard for image and video coding. Besides its improved coding efficiency, it also provides a few error resilience tools in order to limit the effect of errors in the codestream, which can occur when the compressed image or video data are transmitted over an error-prone channel, as typically occurs in wireless communication scenarios. However, for very harsh channels, these tools often do not provide an adequate degree of error protection. In this paper, we propose a novel error-resilience tool for JPEG 2000, based on the concept of ternary arithmetic coders employing a forbidden symbol. Such coders introduce a controlled degree of redundancy during the encoding process, which can be exploited at the decoder side in order to detect and correct errors. We propose a maximum likelihood and a maximum a posteriori context-based decoder, specifically tailored to the JPEG 2000 arithmetic coder, which are able to carry out both hard and soft decoding of a corrupted codestream. The proposed decoder extends the JPEG 2000 capabilities in error-prone scenarios, without violating the standard syntax. Extensive simulations on video sequences show that the proposed decoders largely outperform the standard in terms of PSNR and visual quality.

关键词： error resilient arithmetic coding JPEG 2000 wireless multimedia communications

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