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中国科学院大学学报 ›› 2009, Vol. 26 ›› Issue (5): 663-669.DOI: 10.7523/j.issn.2095-6134.2009.5.012

• 论文 • 上一篇    下一篇

面向空间通信不平等差错保护的联合信源信道编解码方法

刘晓敏, 涂国防   

  1. 中国科学院研究生院信息科学与工程学院, 北京 100049
  • 收稿日期:2009-03-11 修回日期:2009-04-03 发布日期:2009-09-15
  • 通讯作者: 刘晓敏
  • 基金资助:

    国家"863"计划项目(2007AA0Z297)和国家自然科学基金项目(60773137)共同资助 

Joint source-channel coding/decoding based on unequal error protection in space communication

LIU Xiao-Min, TU Guo-Fang   

  1. School of Information Science and Engineering, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-03-11 Revised:2009-04-03 Published:2009-09-15

摘要:

提出了一种面向空间通信不平等差错保护的联合信源信道编解码方法. 该方法采用一种可逆编解码方法对直流系数进行重点保护,即对直流系数编码输出码流进行二进制游程编码,并采用可逆变长码对游程长度进行编码. 对重要性较低的交流(AC)系数采用可变长编解码. 仿真实验结果和分析表明,该方法有效地解决了错误扩散,提高了直流系数的抗差错性能,改善了图像传输质量.

关键词: 不平等差错保护, 信源信道编解码, 可逆编解码, 错误扩散

Abstract:

In this paper we proposed a joint source-channel coding/decoding approach based on unequal error protection in space communication since the DC coefficients are especially significant for image quality in CCSDS IDC. A reversible coding/decoding scheme was adopted for the DC coefficients for special protection, in which the output bit stream of the DC coefficients was encoded by using alternating run-length encoding and then the run-lengths were encoded by reversible variable length codes (RVLC). Meanwhile, variable length coding/decoding scheme was adopted for the AC coefficients. The experiment showed that this approach could greatly alleviate error propagation and improve the error-resilient performance of the DC coefficients,and the approach thereby could improve transmitted image quality.

Key words: unequal error protection, source-channel coding/decoding, reversible coding/decoding, error propagation

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