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Robust transmission of progressive image bitstreams based on DCT over broadband wireless channels

Journal of Harbin Institute of Technology(New Series) 2006年第2期13卷 219-225页

作者：王东华周源华马曾栋 Institute of Image Communication & Information Processing Shanghai Jiaotong University Shanghai 200030 China Research Institute of Communication Technology Harbin Institute of Technology Harbin 150001 China

A robust progressive image transmission scheme over broadband wireless fading channels is developed for 4th generation wireless communication systems （4G） in this paper. The proposed scheme is based on space-time block coded orthogonal frequency-division multiplexing （OFDM） with 4 transmit antennas and 2 receive antennas and uses a simplified minimum mean square error （MMSE） detector instead of maximum likelihood （ML） detectors. Considering DCT is simpler and more widely applied in the industry than wavelet transforms, a progressive image compression method based on DCT called mean-subtract embedded DCT （MSEDCT） is developed, with a simple mean-subtract method for the redundancy of reorganized DC blocks in addition to a structure similar to the embedded zerotree wavelet coding （EZW） method. Then after analyzing and testing bit importance of the progressive MSEDCT bitstreams, the layered unequal error protection method of joint source-channels coding based on Reed-Solomon （RS） codes is used to protect different parts of bitstreams, providing different QoS assurances and good flexibility. Simulation experiments show our proposed scheme can effectively degrade fading effects and obtain better image transmission effects with 10 -20 dB average peak-sig- nal-noise-ratio （PSNR） gains at the median Eb/No than those schemes without space-time coded OFDM or equal error protections with space-time coded OFDM.

关键词： broadband communication embedded source coding image transmission joint source-channel coding

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Robust Progressive Image Transmission Over Rayleigh Fading Channels

Robust Progressive Image Transmission Over Rayleigh Fading C...

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2003 International Conference on Communication Technology

作者： Donghua Wang,Yuanhua Zhou,Pengcheng Su and Jia Wang Institute of Image Communication & Information Processing,Dept.of Electronic Engr.,Shanghai Jiao Tong Univ.,Shanghai 200030,China

Based on the structure of wavelet zerotree coding algorithm, a predictive embedded DCT coding method called PEDCT is developed, removing residual information in the block of reorganized DC coefficient

关键词： wireless image transmission embedded source coding space-time block code unequal error protection

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