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When contourlet coefficients are directly coded, the benefits from directional representation are discounted by the redundancy of the transform. In this paper, we propose a contourlet-based image coding scheme under the sparse representation framework, in which contourlet coefficients are sparsified by the iterative thresholding method before compression. Dependency analysis is performed to reveal...
In this paper, a new scheme for wireless image transmission is proposed. Firstly, based on wavelet decomposition theory, an image source can be decomposed into different weight levels. Then, the bit streams with different weight are modulated by FH-OFDM system, which can give low frequency bits more protection with help of hop frequency graphic design in FH-OFDM. A joint system combined with source...
In order to solve the shortage of wireless resources in next-generation mobile communications, a wavelet packet multicarrier system is built based on multiple input multiple output(MIMO) antennae, which integrates the advantages of multiple antennae channel capacity and the superiority of the translation orthogonality of the wavelet packet basis function. The bit error rate(BER) performance of the...
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