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1998 Vol. 20, No. 1
Display Method:
1998, 20(1): 1-6.
Abstract:
In recent years, M-band orthonormal wavelet bases, due to their good characteristics, have attracted attention. The ability of 2-band wavelet packets to decompose high frequency channels can be employed to improve the properpty of wavelet for time-fr...
In recent years, M-band orthonormal wavelet bases, due to their good characteristics, have attracted attention. The ability of 2-band wavelet packets to decompose high frequency channels can be employed to improve the properpty of wavelet for time-fr...
1998, 20(1): 7-13.
Abstract:
Wavelet transform, especially the multiresolution representation, is a very effective tool for analyzing the information contents of a signal. Based on Mallat s multiresolution analysis, this paper discusses the theoretical analysis of M-band multire...
Wavelet transform, especially the multiresolution representation, is a very effective tool for analyzing the information contents of a signal. Based on Mallat s multiresolution analysis, this paper discusses the theoretical analysis of M-band multire...
1998, 20(1): 14-19.
Abstract:
A novel method to estimate DOAs of coherent sources impinging on an uniform circular array(UCA) is presented in this paper. A virtual uniform linear array(VULA) is first derived by DFT preprocessing, transforming the UCA from element space to phase m...
A novel method to estimate DOAs of coherent sources impinging on an uniform circular array(UCA) is presented in this paper. A virtual uniform linear array(VULA) is first derived by DFT preprocessing, transforming the UCA from element space to phase m...
1998, 20(1): 20-25.
Abstract:
Estimation of model parameter for transient signal is very important in many aspects. This paper presents a new Markov ARMA model Q-slice estimation algorithm of transient signal based on bispectrum. Simulation results show that this new method has s...
Estimation of model parameter for transient signal is very important in many aspects. This paper presents a new Markov ARMA model Q-slice estimation algorithm of transient signal based on bispectrum. Simulation results show that this new method has s...
1998, 20(1): 26-32.
Abstract:
The paper provides the high dimensional optimal problem from which the RELAX algorithm is derived, and compares the RELAX algorithm with the alternating projection algorithm from some aspects. Based on the discussion, an improved RELAX algorithm is p...
The paper provides the high dimensional optimal problem from which the RELAX algorithm is derived, and compares the RELAX algorithm with the alternating projection algorithm from some aspects. Based on the discussion, an improved RELAX algorithm is p...
1998, 20(1): 33-37.
Abstract:
Some shortcomings of common fractal image coding methods are studied, then they are corrected with a new method. The new method is improved further in DCT domain. Coding results show the advantage of the new method.
Some shortcomings of common fractal image coding methods are studied, then they are corrected with a new method. The new method is improved further in DCT domain. Coding results show the advantage of the new method.
1998, 20(1): 38-43.
Abstract:
Based on the Hopfield network a new method of binarization processing for blurring edge image is proposed. First, the binarization processing problem is turned into the optimization problem, then correspondent Hopfield network model and its parameter...
Based on the Hopfield network a new method of binarization processing for blurring edge image is proposed. First, the binarization processing problem is turned into the optimization problem, then correspondent Hopfield network model and its parameter...
1998, 20(1): 44-49.
Abstract:
In this paper, by using the biorthogonal quadrature niters, the biorthogonal mul-tiresolution of finite dimension space equipped with inner product and the fast discrete wavelet transform (FDWT) are constructed. The dual transform method is proposed ...
In this paper, by using the biorthogonal quadrature niters, the biorthogonal mul-tiresolution of finite dimension space equipped with inner product and the fast discrete wavelet transform (FDWT) are constructed. The dual transform method is proposed ...
1998, 20(1): 50-55.
Abstract:
Sparse-array Synthetic Impulse and Aperture Radar (SIAR) can isotropically radiate by employing multiple frequencies (synthetic pulse) and multiple antennas (synthetic antenna). The range resolution only depends on bandwidth of transmitting signals. ...
Sparse-array Synthetic Impulse and Aperture Radar (SIAR) can isotropically radiate by employing multiple frequencies (synthetic pulse) and multiple antennas (synthetic antenna). The range resolution only depends on bandwidth of transmitting signals. ...
1998, 20(1): 56-61.
Abstract:
In this paper, a new maximum likelihood (ML) classification algorithm is proposed to classify the multi-look polarimetric synthetic aperture radar (SAR) imagery. Experimental results with the NASA/JPL airborne L-band 4-look polarimetric SAR data demo...
In this paper, a new maximum likelihood (ML) classification algorithm is proposed to classify the multi-look polarimetric synthetic aperture radar (SAR) imagery. Experimental results with the NASA/JPL airborne L-band 4-look polarimetric SAR data demo...
1998, 20(1): 62-67.
Abstract:
With a multiplicative speckle model, the unconditional density function of the mutli-look polarimetric synthetic aperture radar (SAR) data is derived, and the result is shown to be a generalized K-distribution. The multi-look intensity K-distribution...
With a multiplicative speckle model, the unconditional density function of the mutli-look polarimetric synthetic aperture radar (SAR) data is derived, and the result is shown to be a generalized K-distribution. The multi-look intensity K-distribution...
1998, 20(1): 68-74.
Abstract:
In this paper, the signal decomposition and synthesis technique based on FIR filters have been studied, the different data extension methods included in convolution procession have been investigated in detail, the problem involved in conventional sym...
In this paper, the signal decomposition and synthesis technique based on FIR filters have been studied, the different data extension methods included in convolution procession have been investigated in detail, the problem involved in conventional sym...
1998, 20(1): 75-81.
Abstract:
Based on the generalized open-closing and close-opening operations in mathematical morphology, a class of generalized parallel complex morphological filters is constructed by using multiple structuring elements in this paper. These filters possess so...
Based on the generalized open-closing and close-opening operations in mathematical morphology, a class of generalized parallel complex morphological filters is constructed by using multiple structuring elements in this paper. These filters possess so...
1998, 20(1): 82-86.
Abstract:
The requirement of electromagnetic compatibility (EMC) is a very important network performance index for organizing and planning mobile telecommunication network. The paper put emphasis on researching the ideal network topographical structure which c...
The requirement of electromagnetic compatibility (EMC) is a very important network performance index for organizing and planning mobile telecommunication network. The paper put emphasis on researching the ideal network topographical structure which c...
1998, 20(1): 87-92.
Abstract:
The performance of leaky bucket policer with priority management (PLB) in ATM networks is ananlyzed using extended fluid flow method. This PLB scheme introduces PBS selective discarding priority management into service policing. It guranties lower lo...
The performance of leaky bucket policer with priority management (PLB) in ATM networks is ananlyzed using extended fluid flow method. This PLB scheme introduces PBS selective discarding priority management into service policing. It guranties lower lo...
1998, 20(1): 93-97.
Abstract:
In this paper the bifurcation, chaos and synchronization of the modified Chua s circuit are experimentally studied. On the basis of this research the chaotic secure communication has been successfully demostrated.
In this paper the bifurcation, chaos and synchronization of the modified Chua s circuit are experimentally studied. On the basis of this research the chaotic secure communication has been successfully demostrated.
1998, 20(1): 98-102.
Abstract:
In this paper an optimum design method for high gain microstrip antenna covered with dielectric layers is proposed. In the method, the moment method and optimization for the gain of a point source model are used to find the optimum thickness for ever...
In this paper an optimum design method for high gain microstrip antenna covered with dielectric layers is proposed. In the method, the moment method and optimization for the gain of a point source model are used to find the optimum thickness for ever...
1998, 20(1): 103-108.
Abstract:
The finite element method is combined with the mode-matching method and the multi-mode network theory to analyze the scattering and radiation characteristics of a class of planar dielectric waveguide discontinuities. Unlike the conventional method to...
The finite element method is combined with the mode-matching method and the multi-mode network theory to analyze the scattering and radiation characteristics of a class of planar dielectric waveguide discontinuities. Unlike the conventional method to...
1998, 20(1): 109-113.
Abstract:
An efficient method to calculate the quasi-static capacitance of the via hole structure embedded in a multilayered dielectric media named Dimension Reduction Technique(DRT) is presented. Since the method takes full advantage of the characteristics of...
An efficient method to calculate the quasi-static capacitance of the via hole structure embedded in a multilayered dielectric media named Dimension Reduction Technique(DRT) is presented. Since the method takes full advantage of the characteristics of...
1998, 20(1): 114-119.
Abstract:
One of the crucial technologies for developing high resolution field emitter displays and vacuum microelectronic devices in microwave and millimeter-wave bands is the design and fabrication of field emitter arrays which can provide with focused elect...
One of the crucial technologies for developing high resolution field emitter displays and vacuum microelectronic devices in microwave and millimeter-wave bands is the design and fabrication of field emitter arrays which can provide with focused elect...
1998, 20(1): 120-124.
Abstract:
The expansions of MVL functions in prime field based on Modulo operations are analysed and the concept of modulo relativity is proposed. Then the canonical expansions of any quarternary logic function are presented.
The expansions of MVL functions in prime field based on Modulo operations are analysed and the concept of modulo relativity is proposed. Then the canonical expansions of any quarternary logic function are presented.
1998, 20(1): 125-131.
Abstract:
In this paper, the models of canonical piecewise-linear devices are constructed by the controlled-switch and controlled-source of multidimensions, which are supported by PSpice. So that, the general canonical piecewise-linear network can be analyzed ...
In this paper, the models of canonical piecewise-linear devices are constructed by the controlled-switch and controlled-source of multidimensions, which are supported by PSpice. So that, the general canonical piecewise-linear network can be analyzed ...
1998, 20(1): 132-135.
Abstract:
Chakradhar, et al(1988, 1990) represent the combinational circuit as a Hopfield neural network and formulate the test generation problem as an optimization problem. In this paper, a heuristic genetic algorithms is proposed based on traditional GA and...
Chakradhar, et al(1988, 1990) represent the combinational circuit as a Hopfield neural network and formulate the test generation problem as an optimization problem. In this paper, a heuristic genetic algorithms is proposed based on traditional GA and...
1998, 20(1): 136-140.
Abstract:
To settle the contradiction of noise-filtering and image detail-preserving in image filtering, a combination median filter based on Bayes-decision is proposed. The main contributions are: (1) deriving the union conditional density function of a defin...
To settle the contradiction of noise-filtering and image detail-preserving in image filtering, a combination median filter based on Bayes-decision is proposed. The main contributions are: (1) deriving the union conditional density function of a defin...
1998, 20(1): 141-144.
Abstract:
In this paper, using the component of the impulse response of target, a time-domain bispectrum estimating algorithm based on complex target is presented, this algorithm can estimate the scattering centers of target. The experimtental data of the comp...
In this paper, using the component of the impulse response of target, a time-domain bispectrum estimating algorithm based on complex target is presented, this algorithm can estimate the scattering centers of target. The experimtental data of the comp...
