NEW ITERATIVE SUPER-TRELLIS DECODING WITH SOURCE A PRIORI INFORMATION FOR VLCS WITH TURBO CODES  

作　　者：Liu Jianjun Tu Guofang Wu Weiren 

机构地区：[1]The School of Information Science and Engineering, Graduate University of Chinese Academy of Sciences, Beijing 10004P, China

出　　处：《Journal of Electronics(China)》2007年第1期122-127,共6页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.90304003, No.60573112, No.60272056);the Foundation Project of China (No.A1320061262).

摘　　要：A novel Joint Source and Channel Decoding (JSCD) scheme for Variable Length Codes (VLCs) concatenated with turbo codes utilizing a new super-trellis decoding algorithm is presented in this letter. The basic idea of our decoding algorithm is that source a priori information with the form of bit transition probabilities corresponding to the VLC tree can be derived directly from sub-state transitions in new composite-state represented super-trellis. A Maximum Likelihood (ML) decoding algorithm for VLC sequence estimations based on the proposed super-trellis is also described. Simu-lation results show that the new iterative decoding scheme can obtain obvious encoding gain especially for Reversible Variable Length Codes (RVLCs),when compared with the classical separated turbo decoding and the previous joint decoding not considering source statistical characteristics.A novel Joint Source and Channel Decoding （JSCD） scheme for Variable Length Codes （VLCs） concatenated with turbo codes utilizing a new super-trellis decoding algorithm is presented in this letter. The basic idea of our decoding algorithm is that source a priori information with the form of bit transition probabilities corresponding to the VLC tree can be derived directly from sub-state transitions in new composite-state represented super-trellis. A Maximum Likelihood （ML） decoding algorithm for VLC sequence estimations based on the proposed super-trellis is also described. Simulation results show that the new iterative decoding scheme can obtain obvious encoding gain especially for Reversible Variable Length Codes （RVLCs）, when compared with the classical separated turbo decoding and the previous joint decoding not considering source statistical characteristics.

关 键 词：Joint Source and Channel Decoding （JSCD） Variable Length Codes （VLCs） Turbo codes Super-trellis 

分 类 号：TN911.2[电子电信—通信与信息系统]