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This paper puts the emphasis on symbol timing issues in DC-OFDM based UWB systems. We divide the synchronization process into four modules by functionality: packet detection, coarse timing, TFC detection and fine timing. In the aspect of algorithm development, we adopt the joint auto-correlation and cross-correlation method to meet the requirements of UWB system in different indoor multi-path environments,...
We apply a method of image quality assessment based on structure similarity (SSIM) to images including regions of interest (ROIs). A gradient-based SSIM model that takes the gradient as the main structural information is used among ROIs, while the classical SSIM model is followed in other regions. Then the final image quality index is evaluated after weights-taxed averaging of indexes in every region...
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