This paper aims to investigate the effect of nonlinear satellite channels as well as multipath fading and CCI on the performance of a MIMO-beamforming system. Simulation results confirm the decrease in system performa...
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ISBN:
(纸本)9781424412754;1424412757;1424412765
This paper aims to investigate the effect of nonlinear satellite channels as well as multipath fading and CCI on the performance of a MIMO-beamforming system. Simulation results confirm the decrease in system performance when both nonlinearity and multipath fading are taken into account.
Many common multimedia signal processing, including cropping, filtering, and perceptual coding, make watermark signal fading-like modification. A scheme that applies transmit diversity technique to improve robustness ...
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Many common multimedia signal processing, including cropping, filtering, and perceptual coding, make watermark signal fading-like modification. A scheme that applies transmit diversity technique to improve robustness of digital watermarking is presented. First, the scheme decomposes the original image using wavelet pyramid algorithm and chooses the middle-frequency band for transmission channel that the watermark will be embedded into. Then the watermark is pseudo-randomly permuted. The scheme makes use of space-time coding and differential detection technique to embed and extract watermark. The extracting process has access to neither the original image nor channel state information. Experimental results demonstrate that the scheme improves the performance of robust watermarking.
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