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Compressive sensing (CS) can be applied to fast wavelet-encoded MRI in order to reconstruct images from sparse sampling at sub-Nyquist sampling rates. In this paper, sparse MRI is achieved by a well-designed sampling matrix that satisfies the restricted isometry property (RIP) in CS. The wavelet-tree structure in k-space is utilized in order to reduce the RIP constant. The undersampling of k-space...
This paper proposes a novel iterative channel estimator for orthogonal wavelet packet modulation (OWPM) systems over frequency-selective fading channels. The channel estimation algorithm herein designed introduces linear interpolation to compensate the original value offered by expectation-maximization (EM) algorithm for iterative step. With the utilization of the coherence among both subcarriers...
As one of the main rivers in Hunan Province, Zi River is rich in water quantity. With rainstorm and serious waterlogging disaster, the study on water quantity periodicity of Zi River has great practical significance. In this paper, water resources situation of Zi River valley is introduced. Using the method of Wavelet Analysis, Peak Discharge periodicity of Zi River is studied. By studying, the Peak...
A new de-noising method based on wavelet transform and modified Hampel filter is proposed considering the different features of the wavelet transform coefficients of useful signal and the white noise. It is applied to reduce the white noise in the observed data series. This method has two adjustable parameters and has better adaptability and de-noising performance when the signal or the SNR of signal...
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