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A Joint Iterative Decoding Scheme in Wireless Image Transmission System

A joint source-channel decoding(JSCD) method are designed in real-time wireless image transmission system, JPEG2000 is used to perform source coding with certain error-resilience modes, and a regular low-density parity-check(LDPC) code is selected as the channel error correcting code. During decoding, the error detecting information from source decoder feedback to channel decoder which update the log-likelihood ratio(LLR) of partial codeword bits. Simulation results show that the JSCD scheme can accelerate the iterative procedure, and improve the PSNR of reconstructed images.