Iterative Symbol Decoding of Variable-Length Codes with Convolutional Codes

作者：Wu Hung Tsai^*; Wu Chun Feng^*; Chang Wen Whei^*

来源：Journal of Communications and Networks, 2016, 18(1): 40-49.

DOI：10.1109/JCN.2016.000007

• Extrinsic information
• iterative source-channel decoding (ISCD)
• three-dimensional joint trellis
• variable-length code (VLC)

In this paper, we present a symbol-level iterative sourcechannel decoding (ISCD) algorithm for reliable transmission of variable-length codes (VLCs). Firstly, an improved source a posteriori probability (APP) decoding approach is proposed for packetized variable-length encoded Markov sources. Also proposed is a recursive implementation based on a three-dimensional joint trellis for symbol decoding of binary convolutional codes. APP channel decoding on this joint trellis is realized by modification of the Bahl-Cocke-Jelinek-Raviv algorithm and adaptation to the non-stationary VLC trellis. Simulation results indicate that the proposed ISCD scheme allows to exchange between its constituent decoders the symbol-level extrinsic information and achieves high robustness against channel noises.

• 出版日期2016-2-29