Email alert
1999 Vol. 21, No. 2
Display Method:
1999, 21(2): 145-151.
Abstract:
A new digital modulation recognition method is proposed which is based on the features extracted from generalized autoregressive (GAR) model parameters and the use of neural network classifier. Because of the better noise suppression capacity of the ...
A new digital modulation recognition method is proposed which is based on the features extracted from generalized autoregressive (GAR) model parameters and the use of neural network classifier. Because of the better noise suppression capacity of the ...
1999, 21(2): 152-157.
Abstract:
In this paper a frame-based packet reservation multi-access method is presented for data transmission in CDMA cellular system. Assumed that the number of arriving data packets follows a Poisson distribution, this paper analyzes the throughput and mea...
In this paper a frame-based packet reservation multi-access method is presented for data transmission in CDMA cellular system. Assumed that the number of arriving data packets follows a Poisson distribution, this paper analyzes the throughput and mea...
1999, 21(2): 158-167.
Abstract:
Recent measurements show that the traditional traffic models cannot be success on kinds of long-range dependent traffic which has great influences on the network performance. Fractal or self-similar models are found to be more suitable for describing...
Recent measurements show that the traditional traffic models cannot be success on kinds of long-range dependent traffic which has great influences on the network performance. Fractal or self-similar models are found to be more suitable for describing...
1999, 21(2): 168-174.
Abstract:
A new approach for image restoration based on Cellular Neural Network(CNN) is proposed. The physical meaning of Maximum Entropy (ME) is analyzed and a new template is proposed for ME binary image restoration. The result of computer simulation proves ...
A new approach for image restoration based on Cellular Neural Network(CNN) is proposed. The physical meaning of Maximum Entropy (ME) is analyzed and a new template is proposed for ME binary image restoration. The result of computer simulation proves ...
1999, 21(2): 175-181.
Abstract:
An Expectation-Maximization(EM) training algorithm for estimating the parameters of a special Probability Mapping Network (PMN) structure which forms a multicatolog Bayes classifier is proposed in this paper. The structure of PMN is a four-layer Feed...
An Expectation-Maximization(EM) training algorithm for estimating the parameters of a special Probability Mapping Network (PMN) structure which forms a multicatolog Bayes classifier is proposed in this paper. The structure of PMN is a four-layer Feed...
1999, 21(2): 182-185.
Abstract:
In this paper, the fully-connected higher-order neuron and sparsed higher-order neuron are introduced, the mapping capabilities of the fully-connected higher-order neural networks are investigated, and that arbitrary Boolean function defined from {0,...
In this paper, the fully-connected higher-order neuron and sparsed higher-order neuron are introduced, the mapping capabilities of the fully-connected higher-order neural networks are investigated, and that arbitrary Boolean function defined from {0,...
1999, 21(2): 186-191.
Abstract:
After briefly interoducing the characteristics of 1/f noise in millimeter wave focal plane array detectors, the paper analyses the relation of the wavelet transform and 1/f noise in detail and suggests the fashion of decorrelating 1/f noise using the...
After briefly interoducing the characteristics of 1/f noise in millimeter wave focal plane array detectors, the paper analyses the relation of the wavelet transform and 1/f noise in detail and suggests the fashion of decorrelating 1/f noise using the...
1999, 21(2): 192-196.
Abstract:
This paper consider blind equalization of QAM systems, a new blind equalization criteria based on second and fourth order moments is presented, and a new blind equalization algorithm is derived, it also improved the understanding of blind equalizatio...
This paper consider blind equalization of QAM systems, a new blind equalization criteria based on second and fourth order moments is presented, and a new blind equalization algorithm is derived, it also improved the understanding of blind equalizatio...
1999, 21(2): 197-201.
Abstract:
This paper proposes a multipart key escrow scheme, based on ElGamal public key cryptosystem and Simmons multipart secret-sharing protocol, which not only effectually prevents subliminal channels attack in fair public key cryptosystem, but also suits ...
This paper proposes a multipart key escrow scheme, based on ElGamal public key cryptosystem and Simmons multipart secret-sharing protocol, which not only effectually prevents subliminal channels attack in fair public key cryptosystem, but also suits ...
1999, 21(2): 202-205.
Abstract:
Double-loop network has been one of the most populular topologies used in the distribution systwms. An important problem is to find the shortest path between any two nodes in this kind of networks. This paper gives an O(△) time algorithm for finding ...
Double-loop network has been one of the most populular topologies used in the distribution systwms. An important problem is to find the shortest path between any two nodes in this kind of networks. This paper gives an O(△) time algorithm for finding ...
1999, 21(2): 206-211.
Abstract:
In this paper, the vectors set called complete set is presented. A class of second order ergodic matrix is constructed by using the complete set, and a class of third order ergodic matrix is also constructed by using the partial set of complete set. ...
In this paper, the vectors set called complete set is presented. A class of second order ergodic matrix is constructed by using the complete set, and a class of third order ergodic matrix is also constructed by using the partial set of complete set. ...
1999, 21(2): 212-218.
Abstract:
Based on the scale function representation for a function in L2(R), a new wavelet transform based adaptive system identification scheme used for acoustic echo cancellation is proposed. It can reduce the amount of computation by exploiting the decimat...
Based on the scale function representation for a function in L2(R), a new wavelet transform based adaptive system identification scheme used for acoustic echo cancellation is proposed. It can reduce the amount of computation by exploiting the decimat...
1999, 21(2): 219-225.
Abstract:
This paper presents a minimum error thresholding algorithm under the hypothesis that the gray level histogram of SAR image fitting to a mixture model of shifted Rayleigh distribution. This algorithm is applied to real SAR images and compared with tra...
This paper presents a minimum error thresholding algorithm under the hypothesis that the gray level histogram of SAR image fitting to a mixture model of shifted Rayleigh distribution. This algorithm is applied to real SAR images and compared with tra...
1999, 21(2): 226-231.
Abstract:
A new type of genetic algorithm combined the parallel simulated annealing with the advantages of guaranteeing convergence and deciding convergence easily was proposed to the synthesis of unequally spaced arrays. The position and the weighted coeffici...
A new type of genetic algorithm combined the parallel simulated annealing with the advantages of guaranteeing convergence and deciding convergence easily was proposed to the synthesis of unequally spaced arrays. The position and the weighted coeffici...
1999, 21(2): 232-237.
Abstract:
A new offset elliptic Presnel Zone Plate Antenna (FZPA) has been suggested based on the Fresnel principle. Simulation of the focusing property of this FZPA and that of the regular one showns that the one suggested here can give better focusing charac...
A new offset elliptic Presnel Zone Plate Antenna (FZPA) has been suggested based on the Fresnel principle. Simulation of the focusing property of this FZPA and that of the regular one showns that the one suggested here can give better focusing charac...
1999, 21(2): 238-245.
Abstract:
When a dipole source(electric dipole or magnetic dipole) is located at arbitrary point in circularly multilayered conductive medium,the electromagnetic fields excited by the source contain both TE and TM waves.The series solutions of the fields in ve...
When a dipole source(electric dipole or magnetic dipole) is located at arbitrary point in circularly multilayered conductive medium,the electromagnetic fields excited by the source contain both TE and TM waves.The series solutions of the fields in ve...
1999, 21(2): 246-251.
Abstract:
A novel numerical modeling technique, based on FD-TD and the intrinsic characteristic of spatial periodic structure, is used to analyze the high frequency characteristics of the slow wave structure of arbitrary geometry. The method was sucessfully ap...
A novel numerical modeling technique, based on FD-TD and the intrinsic characteristic of spatial periodic structure, is used to analyze the high frequency characteristics of the slow wave structure of arbitrary geometry. The method was sucessfully ap...
1999, 21(2): 252-257.
Abstract:
The space-wave method, suitable for extended surface targets, is a preferable method for permittivity measurement of ground materials at microwave frequencies. The inversion of permittivity from the measured data, which is established on using the Fr...
The space-wave method, suitable for extended surface targets, is a preferable method for permittivity measurement of ground materials at microwave frequencies. The inversion of permittivity from the measured data, which is established on using the Fr...
1999, 21(2): 258-261.
Abstract:
Taking account of the complexity, delay and realistic, this paper has discussed the realization arragement of the trellis-coded modulaiton applied to the multi-carrier modulation system. The simulation analysis has been taken in the ADSL DMT environm...
Taking account of the complexity, delay and realistic, this paper has discussed the realization arragement of the trellis-coded modulaiton applied to the multi-carrier modulation system. The simulation analysis has been taken in the ADSL DMT environm...
1999, 21(2): 262-266.
Abstract:
This paper presents the analysis of a continuous-time model of the asymmetric polling system with exhaustive service. Compared with the discrete-time model of the polling system with exhaustive service(by Zhao Dongfeng, 1994), the results of two poll...
This paper presents the analysis of a continuous-time model of the asymmetric polling system with exhaustive service. Compared with the discrete-time model of the polling system with exhaustive service(by Zhao Dongfeng, 1994), the results of two poll...
1999, 21(2): 267-272.
Abstract:
In this paper, generalized Hamming weights for Goppa codes and BCH codes are studied. Lower bounds of generalized Hamming weights for Goppa codes are obtained and an algorithm to find the lower bounds is given. Moreover, the last few generalized Hamm...
In this paper, generalized Hamming weights for Goppa codes and BCH codes are studied. Lower bounds of generalized Hamming weights for Goppa codes are obtained and an algorithm to find the lower bounds is given. Moreover, the last few generalized Hamm...
1999, 21(2): 273-274.
Abstract:
The stability ot correlation-immune functions is discussed in tins paper.The correlation-immunity is not stable and generalized Correlation-immunity is stable.
The stability ot correlation-immune functions is discussed in tins paper.The correlation-immunity is not stable and generalized Correlation-immunity is stable.
1999, 21(2): 275-279.
Abstract:
This paper reviews the current status of High Definition Television (HDTV) briefly and sets forth brilliant application perspective of non-broadcasting HDTV. The design and developement of high definition image processing sub-system, and relative sof...
This paper reviews the current status of High Definition Television (HDTV) briefly and sets forth brilliant application perspective of non-broadcasting HDTV. The design and developement of high definition image processing sub-system, and relative sof...
1999, 21(2): 280-284.
Abstract:
A key problem of permutation filters is its too many parameters. In this paper, modified permutation filters called self-dual permutation filters are proposed. The new class filters need half of the permutation filters parameters, but they give almos...
A key problem of permutation filters is its too many parameters. In this paper, modified permutation filters called self-dual permutation filters are proposed. The new class filters need half of the permutation filters parameters, but they give almos...
1999, 21(2): 285-288.
Abstract:
By applying symmetric transmission current-switch theory, the symmetric ternary current-mode CMOS Schmitt inverter which can have multiple outputs is proposed, and its width of hystersis can be adjusted as needed. The result of computer simulation sh...
By applying symmetric transmission current-switch theory, the symmetric ternary current-mode CMOS Schmitt inverter which can have multiple outputs is proposed, and its width of hystersis can be adjusted as needed. The result of computer simulation sh...
