小波编码图像联合信源信道解码算法的研究

张晔; 王申

doi:10.3724/SP.J.1146.2009.01145

小波编码图像联合信源信道解码算法的研究

doi: 10.3724/SP.J.1146.2009.01145

张晔,
王申

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- 被引次数: 0
出版历程
- 收稿日期: 2009-08-28
- 修回日期: 2009-12-07
- 刊出日期: 2010-07-19

Study of Joint Source Channel Decoder for Wavelet Coding Images

Zhang Ye,
Wang Shen

摘要

摘要: 为提高图像在噪声信道中传输的可靠性，该文提出了一种图像联合信源信道解码方案。信源图像首先经离散小波变换，压缩编码。编码数据经RCPC(率兼容删余卷积码)信道编码保护，通过噪声信道传输。在接收端的改进的APRI-SOVA (先验信息软输出维特比算法)在信道解码时，不仅利用了信道输出的软判决，而且进一步利用了信源解码器提供的当前解码的比特的可靠性信息。仿真结果显示，有效利用信源数据中遗留的相关性，能够实现图像解码质量的提高。
- 联合信源信道解码; 离散小波变换; 率兼容删余卷积码; 软输出维特比算法
Abstract: A joint source-channel decoding approach is developed to improve the reliability of image transmissions. The source coders used is the discrete wavelet transform coding, and channel coders used is the RCPC (Rate-Compatible Punctured Convolutional) coding. At the receiver, after transmitted through noise channel, a modified APRI-SOVA (a Priori Soft-Output Viterbi Algorithm) is employed which using not only soft output of the channel but reliability of the current bit providing by source decoder. The simulation results show that the approach may be better to exploit the correlation remain in the source data and use it at the receiver side in order to achieve a more reliable decoding.

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参考文献(1)

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