Research Of Joint Source-channel Coding Technique Based On Unequal Error Protected

This paper is mainly about my research on joint source-channel coding (JSCC). This thesis puts importance on designing joint source-channel coding scheme based on layered coding and unequal error protected.Firstly, the paper gives a brief overview of the necessary background knowledge involved in designing JSCC scheme.Then, the following two chapters investigate the unequal error protection-based JSCC schemes in depth. Chapter 4 presents a joint source-channel coding approach based on layered coding and unequal error protected. Source coding in this paper adopts image coding based on wavelet. According to the property of source coding, this part proposes unequal error protect using RCPC (rate compatible punctured coding) for the progressive compressed data according to error sensitiveness. Studies show that the method can improves the limitation of compressed data to error sensitivity.Chapter 5 presents a JSCC approach based on SPECK source coder and revises Turbo-codes channel coder according to the characteristic of source and channel coding to perform unequal error protected for the source data. This part puts important on Turbo-codes. The performance of Turbo-codes can approach within 0.7 dB of the Shannon bound. Source coding in this scheme also adopts image coding based on wavelet. This part proposes unequal error protect utilizing the property of rate compatible Turbo-codes for the progressive compressed data according to error sensitiveness. This scheme utilizes the property of compressed data which generated in order of importance and gets better balance between bit error rate and code length. The experimental results show that the proposed scheme can get high PSNR(peak signal noise ratio) in high compression ratio and provide the strong robustness to the image in low SNR because of the superior performance of Turbo-codes.