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

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.