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Coding is an important and a difficult subject of research on genetic algorithm (GA). Float code (FC) is super to other codes in use. But, noise and its influence on GA performance were ignored by researches in genetic operation. Mutation played an important role of improving GA performance. This paper presents a float-coded genetic algorithm (FCGA) with wavelet denoising mutation. They are called...
A novel SAR image denoising scheme based on the quad-tree complex wavelet packets transform (QCWPT) was presented to achieve the tradeoff between details retainment and noise removal. A new threshold method was used in the proposed scheme, and the QCWPT detail coefficients were shrunk via calculating the locally adaptive shrinkage factors with reference to the QCWPT coefficients within the neighborhood...
Post processing of GPS data is one efficient method to solve the multi-path effect on precise positioning with GPS technique. Wavelet analysis is been developing to be used to detect and remove the multi-path effect. A new method based on the adaptive threshold wavelet analysis is put forward to remove the high-frequency noises of multi-path effect in the paper. Then the high-frequency filtering and...
Addressing SAR image speckle denoising, this dissertation proposes a new method based on dual tree complex wavelet transformation combined with modification to them according to significant coefficient rule. In the method, a thresholding method are adapted for each selected subband based on the nonlinear functions. The nonlinear functions are based on sigmoid functions. And then, the wavelet coefficients...
Using usual threshold selection methods, a problem exists in the wavelet denoising of the signal that contains some high frequency components. When the signal is denoised, the effect of the frequency band energy leakage (FBEL) of the wavelet analysis results in the increase of the noise estimate of the wavelet denoising and makes the wavelet threshold denoising exist an error. The useful information...
As a medium of signal transmission, communication using power line offers a convenient and inexpensive solution for multimedia signal transmission and control applications. This paper aims to present a de-noising scheme which is a combination between chaotic parameter modulation and wavelet transform in power line communications (PLC). The proposed communication scheme is based on two key ideas. The...
Based on the digital phase ramp feedback technique and advanced digital signal processing techniques, the digital detection system for closed-loop FOG is developed with digital signal processor (DSP) and field programmable gate array (FPGA). The dynamic model and the simplified linear discrete model of the detection system are established. Digital control algorithm in the closed-loop control is analyzed,...
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