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›› 2009, Vol. 26 ›› Issue (5): 663-669.DOI: 10.7523/j.issn.2095-6134.2009.5.012

• Research Articles • Previous Articles     Next Articles

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 Online:2009-09-15

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

CLC Number: