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1999 Vol. 21, No. 3
Display Method:
1999, 21(3): 289-295.
Abstract:
The concern here is retrieval of multiple tone harmonics observed in complex-valued multiplicative noises with nonzero mean. Cyclic mean statistics have proved to be useful for harmonic retrieval in the presence of complex-valued multiplicative noise...
The concern here is retrieval of multiple tone harmonics observed in complex-valued multiplicative noises with nonzero mean. Cyclic mean statistics have proved to be useful for harmonic retrieval in the presence of complex-valued multiplicative noise...
1999, 21(3): 296-301.
Abstract:
A new quadrature sampling technique for arbitrary bandpass signal within baseband sampling rate is presented. The input bandpass signal whose carrier frequency lies in the A/D baseband sampling rate is first decimated by factor 2 and modulated by (-1...
A new quadrature sampling technique for arbitrary bandpass signal within baseband sampling rate is presented. The input bandpass signal whose carrier frequency lies in the A/D baseband sampling rate is first decimated by factor 2 and modulated by (-1...
1999, 21(3): 302-306.
Abstract:
A method is presented for real-time estimation of the frequency, azimuth and elevation angles of the signal incident on uniform circular arrays(UCA) over a very wide frequency band(1~18GHz) in DFT beamspace. The method provides unambiguous frequency ...
A method is presented for real-time estimation of the frequency, azimuth and elevation angles of the signal incident on uniform circular arrays(UCA) over a very wide frequency band(1~18GHz) in DFT beamspace. The method provides unambiguous frequency ...
1999, 21(3): 307-310.
Abstract:
The sampling theorem for bandpass signal is the theoretical basis for design of all digital quadrature detectors. There are various expressions for this theorem in previous references, which has greatly affected the optimum design of all digital quad...
The sampling theorem for bandpass signal is the theoretical basis for design of all digital quadrature detectors. There are various expressions for this theorem in previous references, which has greatly affected the optimum design of all digital quad...
1999, 21(3): 311-314.
Abstract:
This paper describes the implementation of the corrector of I Q errors in coherent processor. The correcting network consists of combination logic circuit and it can correct the gain and phase imbalances and the bias errors of the in-phase and quadra...
This paper describes the implementation of the corrector of I Q errors in coherent processor. The correcting network consists of combination logic circuit and it can correct the gain and phase imbalances and the bias errors of the in-phase and quadra...
1999, 21(3): 315-319.
Abstract:
Potential is an important conception in Gibbs random field (GRF) model. In this paper, an approach for texture analysis based on maximum potential is presented. Experimental results prove that this approach can be an effective means for texture analy...
Potential is an important conception in Gibbs random field (GRF) model. In this paper, an approach for texture analysis based on maximum potential is presented. Experimental results prove that this approach can be an effective means for texture analy...
1999, 21(3): 320-325.
Abstract:
The problems of parameter selections for potential function used to initialize cluster centers are discussed, and two methods are given for determining these parameters. Then a new density function to initialize cluster centers is also given which is...
The problems of parameter selections for potential function used to initialize cluster centers are discussed, and two methods are given for determining these parameters. Then a new density function to initialize cluster centers is also given which is...
1999, 21(3): 326-331.
Abstract:
In this paper, an efficient engineering classification of ship noises based on a local adaptive wavelet and Gauss neural network synthesis classification system is presented. The classification systems combine two methods of feature extraction and cl...
In this paper, an efficient engineering classification of ship noises based on a local adaptive wavelet and Gauss neural network synthesis classification system is presented. The classification systems combine two methods of feature extraction and cl...
1999, 21(3): 332-336.
Abstract:
Some new results about estimation of attraction domain of memory patterns and exponential convergence rate of the network trajectories to memory patterns for Hopfield continuous associative memory are obtained by using of some new technics and Lyapun...
Some new results about estimation of attraction domain of memory patterns and exponential convergence rate of the network trajectories to memory patterns for Hopfield continuous associative memory are obtained by using of some new technics and Lyapun...
1999, 21(3): 337-342.
Abstract:
A new method of adaptively controlling the sampling rate of tracking is proposed in this paper. The analytic relationship between the sampling interval and the accuracy and model parameters of filter is applied.The problem of deciding the amount of t...
A new method of adaptively controlling the sampling rate of tracking is proposed in this paper. The analytic relationship between the sampling interval and the accuracy and model parameters of filter is applied.The problem of deciding the amount of t...
1999, 21(3): 343-348.
Abstract:
The designing of step frequency signal is concerned.Stochastic sequence step frequency signal is advanced to overcome the ordered step frequency signal s default of range-velocity coupling. The advanced signal is better than the ordered step frequenc...
The designing of step frequency signal is concerned.Stochastic sequence step frequency signal is advanced to overcome the ordered step frequency signal s default of range-velocity coupling. The advanced signal is better than the ordered step frequenc...
1999, 21(3): 349-354.
Abstract:
A new motion estimation algorithm based on spatio-temporal cohenence is presented. In this proposed algorithm, an initial motion vector of the block which has good coherence with its neighbors or that of the previous frame is directly predicated. A m...
A new motion estimation algorithm based on spatio-temporal cohenence is presented. In this proposed algorithm, an initial motion vector of the block which has good coherence with its neighbors or that of the previous frame is directly predicated. A m...
1999, 21(3): 355-359.
Abstract:
Aiming at the problems existing in the present frequency planing, this article proposes a method to overcome the obstacle of handwork frequency planning and high demand of electronic map, using expert system and genetic algorithm. So that it gives a ...
Aiming at the problems existing in the present frequency planing, this article proposes a method to overcome the obstacle of handwork frequency planning and high demand of electronic map, using expert system and genetic algorithm. So that it gives a ...
1999, 21(3): 360-365.
Abstract:
A method (VP-PRMA) based on the users demand to improve the performance of voice service in PRMA system is proposed. In the paper, a new system measurement based on relative penalty factor is used. After the analysis of PRMA, the new method, using va...
A method (VP-PRMA) based on the users demand to improve the performance of voice service in PRMA system is proposed. In the paper, a new system measurement based on relative penalty factor is used. After the analysis of PRMA, the new method, using va...
1999, 21(3): 366-373.
Abstract:
The principle of synchronization in FD/SSMA (Frequency Diversity/Spread Spectrum Multiple Access) system with DFT (Discrete Fourier Transform) implementation is studied. It is shown that both byte-timing synchronization (i.e. the time-window of DFT t...
The principle of synchronization in FD/SSMA (Frequency Diversity/Spread Spectrum Multiple Access) system with DFT (Discrete Fourier Transform) implementation is studied. It is shown that both byte-timing synchronization (i.e. the time-window of DFT t...
1999, 21(3): 374-378.
Abstract:
In this paper, Malvar wavelet transform is implemented in MCM (Multicarrier Modulation) system. It is proposed that assigning the bandwidth nonuniformly using Malvar wavelet transforming is to combat with the multi-tone noises existing simultaneously...
In this paper, Malvar wavelet transform is implemented in MCM (Multicarrier Modulation) system. It is proposed that assigning the bandwidth nonuniformly using Malvar wavelet transforming is to combat with the multi-tone noises existing simultaneously...
1999, 21(3): 379-383.
Abstract:
This paper uses factoring method for computing rooted communication reliability of networks, i.e., the proability that there are operating paths from the root vertex to all other vertices. Two new reliability-preserving reductions and an edge-selecti...
This paper uses factoring method for computing rooted communication reliability of networks, i.e., the proability that there are operating paths from the root vertex to all other vertices. Two new reliability-preserving reductions and an edge-selecti...
1999, 21(3): 384-390.
Abstract:
This paper presents a synthesis methodology for ECL circuits based on a mixed voltage-current signal representation and operation denned on the voltage and current signals. The ideas presented in this paper are then demonstrated on the design of an E...
This paper presents a synthesis methodology for ECL circuits based on a mixed voltage-current signal representation and operation denned on the voltage and current signals. The ideas presented in this paper are then demonstrated on the design of an E...
1999, 21(3): 391-396.
Abstract:
The determination of the current distribution on the dipoles of microstrip antennas and the coupling between elements of arrays are especially important for the analysis of microstip antennas and arrays.Unfortunately,the calculation is tedious and ti...
The determination of the current distribution on the dipoles of microstrip antennas and the coupling between elements of arrays are especially important for the analysis of microstip antennas and arrays.Unfortunately,the calculation is tedious and ti...
1999, 21(3): 397-403.
Abstract:
A new method of truncation MR artifact reduction is proposed in this paper. In the method, any digital signal spectrum can be expressed as the weighted sum of spectrum functions related to the signal singularity locations. The singularity locations a...
A new method of truncation MR artifact reduction is proposed in this paper. In the method, any digital signal spectrum can be expressed as the weighted sum of spectrum functions related to the signal singularity locations. The singularity locations a...
1999, 21(3): 404-407.
Abstract:
This paper describes the characterization of texture properties at multiple scales and orientations using the wavelet transform, and introduces a new wavelet feature suitable for textured image classification. It is pointed out that the new feature i...
This paper describes the characterization of texture properties at multiple scales and orientations using the wavelet transform, and introduces a new wavelet feature suitable for textured image classification. It is pointed out that the new feature i...
1999, 21(3): 408-411.
Abstract:
A new method for choosing biorthogonal wavelet bases which is suitable for image coding is presented. A thoroughly comparative study is made and biorthogonal wavelet bases suitable for image coding are selected by using several criteria of evaluation...
A new method for choosing biorthogonal wavelet bases which is suitable for image coding is presented. A thoroughly comparative study is made and biorthogonal wavelet bases suitable for image coding are selected by using several criteria of evaluation...
1999, 21(3): 412-415.
Abstract:
This paper analyzes the reason for low convergence rate of BP network standard backpropagation algorithm to nonblanced training set, researches how to improve the learning algorithm in order to increase training speed, and through two experiments tes...
This paper analyzes the reason for low convergence rate of BP network standard backpropagation algorithm to nonblanced training set, researches how to improve the learning algorithm in order to increase training speed, and through two experiments tes...
1999, 21(3): 416-419.
Abstract:
In this paper, a new method of communications using chaotic signal is presented. This method is that the slope of the non-linear resistance in Chua s circuit is modulated with the input signal. At the receiving end, the signal is demodulated using th...
In this paper, a new method of communications using chaotic signal is presented. This method is that the slope of the non-linear resistance in Chua s circuit is modulated with the input signal. At the receiving end, the signal is demodulated using th...
1999, 21(3): 420-423.
Abstract:
The paper presents an algorithm for detecting interference in adaptive filter, because interference can deteriorate adaptive filter performance. The algorithm can improve the performance of adaptive filter under interference environment. The computer...
The paper presents an algorithm for detecting interference in adaptive filter, because interference can deteriorate adaptive filter performance. The algorithm can improve the performance of adaptive filter under interference environment. The computer...
1999, 21(3): 424-427.
Abstract:
FDTD coupled with Matrix Pencil method was applied for computation of the resonant frequency and external quality factor of waveguide loaded cavities. With the new method, the computing time is reduced considerably and the accuracy of numerical resul...
FDTD coupled with Matrix Pencil method was applied for computation of the resonant frequency and external quality factor of waveguide loaded cavities. With the new method, the computing time is reduced considerably and the accuracy of numerical resul...
1999, 21(3): 428-432.
Abstract:
A scheme of FDTD near to far zone transformation for ground wave scattering from objects above a flat earth is presented in this paper. With the equivalent principle, the equivalent electric and magnetic currents can be obtained from FDTD near field ...
A scheme of FDTD near to far zone transformation for ground wave scattering from objects above a flat earth is presented in this paper. With the equivalent principle, the equivalent electric and magnetic currents can be obtained from FDTD near field ...
