收稿日期: 2009-03-11
修回日期: 2009-04-03
网络出版日期: 2009-09-15
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
Received date: 2009-03-11
Revised date: 2009-04-03
Online published: 2009-09-15
刘晓敏 , 涂国防 . 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[J]. 中国科学院大学学报, 2009 , 26(5) : 663 -669 . DOI: 10.7523/j.issn.2095-6134.2009.5.012
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.
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