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2002 Vol. 24, No. 7
Display Method:
2002, 24(7): 865-871.
Abstract:
A novel method based on orthogonal redundancy sampling is proposed for har-monies estimation, which utilizes orthogonal redundancy sampling to obtain a signal with the information of its frequency range, and decomposes signal s auto-correlation matri...
A novel method based on orthogonal redundancy sampling is proposed for har-monies estimation, which utilizes orthogonal redundancy sampling to obtain a signal with the information of its frequency range, and decomposes signal s auto-correlation matri...
2002, 24(7): 872-878.
Abstract:
Under the condition of spatial subsampling, with flexible definition of fourth-order cumulant matrix of L-shaped array antennas output, utilizing the blind Gaussian and aperture extension properties of high-order cumulant, the estimation of frequency...
Under the condition of spatial subsampling, with flexible definition of fourth-order cumulant matrix of L-shaped array antennas output, utilizing the blind Gaussian and aperture extension properties of high-order cumulant, the estimation of frequency...
2002, 24(7): 879-886.
Abstract:
The key problem of eigen-subspace methods is the estimation of signal or noise subspace. In practical situations, there exist signals whose statistic characteristics always change over time. To obtain the real-time estimates of signal parameters, it ...
The key problem of eigen-subspace methods is the estimation of signal or noise subspace. In practical situations, there exist signals whose statistic characteristics always change over time. To obtain the real-time estimates of signal parameters, it ...
2002, 24(7): 887-893.
Abstract:
Cyclostationarity of AM signals is analyzed and time-difference extraction method based on Cycle Cross-Correlation(CCC) is presented in this paper. An Extended CCC method AM-ECCC method for moving targets is given also. Simulation results show that t...
Cyclostationarity of AM signals is analyzed and time-difference extraction method based on Cycle Cross-Correlation(CCC) is presented in this paper. An Extended CCC method AM-ECCC method for moving targets is given also. Simulation results show that t...
2002, 24(7): 894-899.
Abstract:
A modified DS evidence combination method based on evidence classification is introduced. Such a method imitates human s behavior in classification to solve the problem of combing evidences with high degree of conflict. When a sequence of beliefs is ...
A modified DS evidence combination method based on evidence classification is introduced. Such a method imitates human s behavior in classification to solve the problem of combing evidences with high degree of conflict. When a sequence of beliefs is ...
2002, 24(7): 900-904.
Abstract:
A novel wavelet-based vector quantization (VQ) algorithm is presented in this paper. In this algorithm, first, 9/7 biorthogonal wavelet transform decomposes the original image, then the correlation of the three directions wavelet coefficients is used...
A novel wavelet-based vector quantization (VQ) algorithm is presented in this paper. In this algorithm, first, 9/7 biorthogonal wavelet transform decomposes the original image, then the correlation of the three directions wavelet coefficients is used...
2002, 24(7): 905-909.
Abstract:
In this paper, an automatic algorithm of image enhancement based on fuzzy sets is proposed by defining a new membership function. This algorithm is performed through extracting the fuzzy property plane from the spatial domain firstly, executing the f...
In this paper, an automatic algorithm of image enhancement based on fuzzy sets is proposed by defining a new membership function. This algorithm is performed through extracting the fuzzy property plane from the spatial domain firstly, executing the f...
2002, 24(7): 910-915.
Abstract:
Euclidean algorithm can be used to design Perfect Reconstruction (PR) filter banks. An algorithm of Euclidean polynomial factorization and the theory of two-channel filter banks with low delay are discussed in this paper. A major problem of Euclidean...
Euclidean algorithm can be used to design Perfect Reconstruction (PR) filter banks. An algorithm of Euclidean polynomial factorization and the theory of two-channel filter banks with low delay are discussed in this paper. A major problem of Euclidean...
2002, 24(7): 916-920.
Abstract:
An Artificial Neural Network (ANN) is proposed which is implemented through Pulse Width Modulation (PWM) technique. The weight of the neural network is stored in digital memory, while the synapse circuits are composed of switches. The capacitor integ...
An Artificial Neural Network (ANN) is proposed which is implemented through Pulse Width Modulation (PWM) technique. The weight of the neural network is stored in digital memory, while the synapse circuits are composed of switches. The capacitor integ...
2002, 24(7): 921-928.
Abstract:
In this paper, the characteristics of B-spline basis functions are first introduced, and the universal approximation properties of hierarchical fuzzy systems based on B-spline basis functions are verified, and then, another new proof on approximation...
In this paper, the characteristics of B-spline basis functions are first introduced, and the universal approximation properties of hierarchical fuzzy systems based on B-spline basis functions are verified, and then, another new proof on approximation...
2002, 24(7): 929-934.
Abstract:
The problem of detecting targets in the cluttered circumstance with wide-band high-resolution radar is studied. A way of improving SCR(Signal-to-Clutter-Ratio) is cited by linear integration filtering in polarization domain. With the intrinsic high r...
The problem of detecting targets in the cluttered circumstance with wide-band high-resolution radar is studied. A way of improving SCR(Signal-to-Clutter-Ratio) is cited by linear integration filtering in polarization domain. With the intrinsic high r...
2002, 24(7): 935-943.
Abstract:
Based on the principles of the space-borne ScanSAR, some important parameters to define the position of sub-swathes, the timing sequence of the system, the choice of the PRFs, the number of the samples of each burst and the SNR are investigated. Some...
Based on the principles of the space-borne ScanSAR, some important parameters to define the position of sub-swathes, the timing sequence of the system, the choice of the PRFs, the number of the samples of each burst and the SNR are investigated. Some...
2002, 24(7): 944-947.
Abstract:
In this paper a mandarin continuous speech recognition system is implemented based on classical Hidden Markov Model (HMM). The performance of classical HMM is quantitatively analyzed and evaluated.
In this paper a mandarin continuous speech recognition system is implemented based on classical Hidden Markov Model (HMM). The performance of classical HMM is quantitatively analyzed and evaluated.
2002, 24(7): 948-953.
Abstract:
In multimedia communication networks, the multicasting is increasingly important. Nodes in the networks will likely vary in their abilities to support multicasting. Some nodes do not have multicasting ability, other nodes may be limited in the number...
In multimedia communication networks, the multicasting is increasingly important. Nodes in the networks will likely vary in their abilities to support multicasting. Some nodes do not have multicasting ability, other nodes may be limited in the number...
2002, 24(7): 954-960.
Abstract:
The scheduling algorithms of routers in the Internet are very important to the QoS (Quality of Service) which can be derived by users flows. A new scheduling algorithmLogarithmic Proportional Fair queueing (LPFQ) scheduling algorithm is presented, an...
The scheduling algorithms of routers in the Internet are very important to the QoS (Quality of Service) which can be derived by users flows. A new scheduling algorithmLogarithmic Proportional Fair queueing (LPFQ) scheduling algorithm is presented, an...
2002, 24(7): 961-967.
Abstract:
In this paper, the approach to produce the complex wavelet packet basis function is given. A complex wavelet packet function based frequency-hopping multiple access communication system, which employs antenna diversity and decision feedback equalizat...
In this paper, the approach to produce the complex wavelet packet basis function is given. A complex wavelet packet function based frequency-hopping multiple access communication system, which employs antenna diversity and decision feedback equalizat...
2002, 24(7): 968-975.
Abstract:
In order to analyze the subharmonic load pull characteristic of MESFET power amplifier driven by CDMA type wide band signal, a set of Volterra transfer funcion expressions are deducted with the MESFET nonlinear model. With these expressions, the rela...
In order to analyze the subharmonic load pull characteristic of MESFET power amplifier driven by CDMA type wide band signal, a set of Volterra transfer funcion expressions are deducted with the MESFET nonlinear model. With these expressions, the rela...
2002, 24(7): 976-981.
Abstract:
Analytical solutions of electromagnetic fields in the elliptical chirowaveguide have been studied. The model fields distribution and modal characteristic equations are obtained. The numerical solutions for the modal characteristic equations of low-or...
Analytical solutions of electromagnetic fields in the elliptical chirowaveguide have been studied. The model fields distribution and modal characteristic equations are obtained. The numerical solutions for the modal characteristic equations of low-or...
2002, 24(7): 982-986.
Abstract:
The roles of hot electrons and holes in dielectric breakdown of the thin gate oxide have been quantitatively investigated in this paper, The changes of threshold voltage have been discussed under different stress conditions. This paper is the first r...
The roles of hot electrons and holes in dielectric breakdown of the thin gate oxide have been quantitatively investigated in this paper, The changes of threshold voltage have been discussed under different stress conditions. This paper is the first r...
2002, 24(7): 987-991.
Abstract:
A new approach for continuous speech recognition based on neurocomputer CASS-ANDRA-I and syntactic analysis based on key words is proposed. By using CASSANDRA-I, the speed of the recognition is so rapid that recognition can be at real time. By using ...
A new approach for continuous speech recognition based on neurocomputer CASS-ANDRA-I and syntactic analysis based on key words is proposed. By using CASSANDRA-I, the speed of the recognition is so rapid that recognition can be at real time. By using ...
2002, 24(7): 992-996.
Abstract:
In this paper, a new method for time-varying ARM A model is introduced. It includes two procedures. First, using one method of signal decomposition, a signal is decomposed into some basic components; second, time-varying ARMA model is established in ...
In this paper, a new method for time-varying ARM A model is introduced. It includes two procedures. First, using one method of signal decomposition, a signal is decomposed into some basic components; second, time-varying ARMA model is established in ...
2002, 24(7): 997-999.
Abstract:
An improved protocol of electrical auction with sealed bids is presented by using nested interval theorem, bit commitment protocol and millionaire protocol. With the advantages of anonymity, privacy, efficiency, the improved protocol supports the sec...
An improved protocol of electrical auction with sealed bids is presented by using nested interval theorem, bit commitment protocol and millionaire protocol. With the advantages of anonymity, privacy, efficiency, the improved protocol supports the sec...
2002, 24(7): 1000-1004.
Abstract:
In this paper, the operating principle of UWB spread spectrum communication technique is described first, then the receiver signal processing is analyzed, the multiple access performance: BER and the number of users that system can support is evaluat...
In this paper, the operating principle of UWB spread spectrum communication technique is described first, then the receiver signal processing is analyzed, the multiple access performance: BER and the number of users that system can support is evaluat...
2002, 24(7): 1005-1008.
Abstract:
Hf film is coated on the surface of Mo-grids by vacuum ion beam aided deposition technology. The SEM, XRD and RBS analyses are performed on modified Mo-grids. Life-span tests of this modified Mo-grid are carried out by diode experiment. When the temp...
Hf film is coated on the surface of Mo-grids by vacuum ion beam aided deposition technology. The SEM, XRD and RBS analyses are performed on modified Mo-grids. Life-span tests of this modified Mo-grid are carried out by diode experiment. When the temp...
