Grangetto Marco, Scanavino Bartolo, Olmo Gabriella, Benedetto Sergio
Center for Multimedia Radio Communica- qans (CERCOM), Department of Electronics, Politecnico di Torino, 10129 Torino, Italy.
IEEE Trans Image Process. 2007 Jun;16(6):1557-67. doi: 10.1109/tip.2007.896612.
In this paper, an innovative joint-source channel coding scheme is presented. The proposed approach enables iterative soft decoding of arithmetic codes by means of a soft-in soft- out decoder based on suboptimal search and pruning of a binary tree. An error-resilient arithmetic coder with a forbidden symbol is used in order to improve the performance of the joint source/channel scheme. The performance in the case of transmission across the AWGN channel is evaluated in terms of word error probability and compared to a traditional separated approach. The interleaver gain, the convergence property of the system, and the optimal source/channel rate allocation are investigated. Finally, the practical relevance of the proposed joint decoding approach is demonstrated within the JPEG 2000 coding standard. In particular, an iterative channel and JPEG 2000 decoder is designed and tested in the case of image transmission across the AWGN channel.
本文提出了一种创新的联合信源信道编码方案。所提出的方法通过基于二叉树的次优搜索和剪枝的软输入软输出解码器实现算术码的迭代软解码。为了提高联合信源/信道方案的性能，使用了带有禁用符号的抗误码算术编码器。通过误码概率评估在加性高斯白噪声（AWGN）信道上传输时的性能，并与传统的分离方法进行比较。研究了交织增益、系统的收敛特性以及最优信源/信道速率分配。最后，在JPEG 2000编码标准中展示了所提出的联合解码方法的实际相关性。特别是，设计并测试了一种在通过AWGN信道进行图像传输时的迭代信道和JPEG 2000解码器。
