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2004 Vol. 26, No. 3
Display Method:
2004, 26(3): 337-343.
Abstract:
The problem of overdetermined Blind Source Separation (BSS) where there are more mixtures than sources is considered. Beginning with the Singular Value Decompo sition (SVD) of the separation matrix, a cost function is presented based on Independent C...
The problem of overdetermined Blind Source Separation (BSS) where there are more mixtures than sources is considered. Beginning with the Singular Value Decompo sition (SVD) of the separation matrix, a cost function is presented based on Independent C...
2004, 26(3): 344-349.
Abstract:
In allusion to wideband chirp signals with time-varying direction vector, this paper constructs STFD(Spatial Time-Frequency Distribution) by short WVD(Wigner-Ville Distribution). By eigenvalue decomposition to get signal subspace and noise subspace, ...
In allusion to wideband chirp signals with time-varying direction vector, this paper constructs STFD(Spatial Time-Frequency Distribution) by short WVD(Wigner-Ville Distribution). By eigenvalue decomposition to get signal subspace and noise subspace, ...
2004, 26(3): 350-356.
Abstract:
This paper presents a new fractional lower order moment-based 2-D direction finding method-robust covariation DOA matrix method in the presence of impulsive noise which can be modeled as a symmetric alpha-stable(SaS) process. The method extends signa...
This paper presents a new fractional lower order moment-based 2-D direction finding method-robust covariation DOA matrix method in the presence of impulsive noise which can be modeled as a symmetric alpha-stable(SaS) process. The method extends signa...
2004, 26(3): 357-363.
Abstract:
Allowable platform motion error allocation is an important part of system-wide allocation in SAR system. It is a necessary system design procedure to take into account error effects, error sources, and performance-limiting factors to determine more r...
Allowable platform motion error allocation is an important part of system-wide allocation in SAR system. It is a necessary system design procedure to take into account error effects, error sources, and performance-limiting factors to determine more r...
2004, 26(3): 364-369.
Abstract:
The principle of the quadrature coherent detector of the digital Synthetic Aperture Radar (SAR) is introduced in the paper. The imbalance of its I/Q is analyzed, and the uniform index of its imbalance is presented. For the correction of the digital S...
The principle of the quadrature coherent detector of the digital Synthetic Aperture Radar (SAR) is introduced in the paper. The imbalance of its I/Q is analyzed, and the uniform index of its imbalance is presented. For the correction of the digital S...
2004, 26(3): 370-374.
Abstract:
A new 3D noise analysis method is introduced on the basis of analyzing the radiometric performance and noise of optical satellite image. The imaging noise can be divided into seven parts according to temporal and horizontal, vertical dimensions. The ...
A new 3D noise analysis method is introduced on the basis of analyzing the radiometric performance and noise of optical satellite image. The imaging noise can be divided into seven parts according to temporal and horizontal, vertical dimensions. The ...
2004, 26(3): 375-381.
Abstract:
A continuous speech recognition system for a talking head is presented in this paper, which is based on the viseme (the basic speech unit in visual domain) HMMs and segments speech to mouth shape sequences with timing boundaries. The trisemes are for...
A continuous speech recognition system for a talking head is presented in this paper, which is based on the viseme (the basic speech unit in visual domain) HMMs and segments speech to mouth shape sequences with timing boundaries. The trisemes are for...
2004, 26(3): 382-388.
Abstract:
The new pattern recognition method of traditional Chinese medicine based on High Performance Liquid Chromatogram(HPLC) is presented. While a new self-organizing fuzzy neural network is also proposed in order to recognize the traditional Chinese medic...
The new pattern recognition method of traditional Chinese medicine based on High Performance Liquid Chromatogram(HPLC) is presented. While a new self-organizing fuzzy neural network is also proposed in order to recognize the traditional Chinese medic...
2004, 26(3): 389-393.
Abstract:
In this paper, the fractal scale is introduced as a new measure to describe natural physical surfaces. An Intercept And Linearity (IAL) method is proposed to determine the fractal scale automatically. Experiments indicate that the fractal scale, toge...
In this paper, the fractal scale is introduced as a new measure to describe natural physical surfaces. An Intercept And Linearity (IAL) method is proposed to determine the fractal scale automatically. Experiments indicate that the fractal scale, toge...
2004, 26(3): 394-397.
Abstract:
A new appproach to solve numerical integration is developsed in this paper, based on the algorithm of neural networks with triangle basis functions. The convergence theorem of the neural networks algorithm and the theorem of numerical integration sol...
A new appproach to solve numerical integration is developsed in this paper, based on the algorithm of neural networks with triangle basis functions. The convergence theorem of the neural networks algorithm and the theorem of numerical integration sol...
2004, 26(3): 400-404.
Abstract:
In this paper, two methods for the synthesis of the pattern of a linear array, based on Genetic Algorithm(GA), are discussed. The results of the two methods can all ap proximate the results of the Chebyshevs method. Compared with the method of Chebys...
In this paper, two methods for the synthesis of the pattern of a linear array, based on Genetic Algorithm(GA), are discussed. The results of the two methods can all ap proximate the results of the Chebyshevs method. Compared with the method of Chebys...
2004, 26(3): 405-409.
Abstract:
Considering CRT visual display unit and reconnaissance-receiving system as a communication system, this paper sets up two information source models and their corresponding information sink models of informations electromagnetic leakage from CRT visua...
Considering CRT visual display unit and reconnaissance-receiving system as a communication system, this paper sets up two information source models and their corresponding information sink models of informations electromagnetic leakage from CRT visua...
2004, 26(3): 410-415.
Abstract:
Especially for the reliability state detection of space borne EPC, infrared thermal imaging technique, a new non-contact detection method, and its detection principle and the constitution of the detection system are introduced; and then, after plenty...
Especially for the reliability state detection of space borne EPC, infrared thermal imaging technique, a new non-contact detection method, and its detection principle and the constitution of the detection system are introduced; and then, after plenty...
2004, 26(3): 416-420.
Abstract:
The multiple antenna Orthogonal Frequency Division Multiplexing(OFDM) system model is analyzed in this paper. Considering that Multiple-Input Multiple-Output(MIMO) channel can be separated into parallel subchannels by means of the singular value deco...
The multiple antenna Orthogonal Frequency Division Multiplexing(OFDM) system model is analyzed in this paper. Considering that Multiple-Input Multiple-Output(MIMO) channel can be separated into parallel subchannels by means of the singular value deco...
2004, 26(3): 421-426.
Abstract:
In this paper, the capacity of VSG-CDMA system with power control imperfections in the presence of multiplicate types of users is discussed. Admission criterion is derived according to the interference of inter cell Iin and other cell Iother, the adm...
In this paper, the capacity of VSG-CDMA system with power control imperfections in the presence of multiplicate types of users is discussed. Admission criterion is derived according to the interference of inter cell Iin and other cell Iother, the adm...
2004, 26(3): 427-434.
Abstract:
In WCDMA system, the radio resource management entity is usually imple mented in the radio network controller. However, transport format in dedicated channels can be changed frame by frame. This fast format change can be seen as a fast part of the ra...
In WCDMA system, the radio resource management entity is usually imple mented in the radio network controller. However, transport format in dedicated channels can be changed frame by frame. This fast format change can be seen as a fast part of the ra...
2004, 26(3): 435-439.
Abstract:
Techniques which can realize anonymity play an important role in the protection of partners’ privacy. Sign-cryption can sign and encrypt message in one logic step and has lower cost than that of "firstly sign and then encrypt". Based on the thoughts ...
Techniques which can realize anonymity play an important role in the protection of partners’ privacy. Sign-cryption can sign and encrypt message in one logic step and has lower cost than that of "firstly sign and then encrypt". Based on the thoughts ...
2004, 26(3): 440-445.
Abstract:
This article analyses the shortcomings of mobile IPv6 protocol in handoff process first, then puts forward an approach based on active network technology to solve the problems and enhance mobile IPv6. Network simulation proves that this approach has ...
This article analyses the shortcomings of mobile IPv6 protocol in handoff process first, then puts forward an approach based on active network technology to solve the problems and enhance mobile IPv6. Network simulation proves that this approach has ...
2004, 26(3): 446-452.
Abstract:
This paper focuses on measurement of Internet end-to-end delay, which is one of the important characteristics of Internet end-to-end packet dynamics. Measuring the end-to-end delay of Internet can be used in QoS management, SLA management, congestion...
This paper focuses on measurement of Internet end-to-end delay, which is one of the important characteristics of Internet end-to-end packet dynamics. Measuring the end-to-end delay of Internet can be used in QoS management, SLA management, congestion...
2004, 26(3): 453-458.
Abstract:
A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed. The key of the described algorithm leans upon the periodic 2-D time-frequency spectrum structure. By searching the flat regions in the time direction o...
A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed. The key of the described algorithm leans upon the periodic 2-D time-frequency spectrum structure. By searching the flat regions in the time direction o...
2004, 26(3): 459-465.
Abstract:
This paper proposes a new burst assembly technique for supporting QoS in Op tical Burst Switching (OBS) networks. It consists of the adaptive-threshold burst assembly algorithm and QoS-based random offset-time scheme. The algorithm fits well the mult...
This paper proposes a new burst assembly technique for supporting QoS in Op tical Burst Switching (OBS) networks. It consists of the adaptive-threshold burst assembly algorithm and QoS-based random offset-time scheme. The algorithm fits well the mult...
2004, 26(3): 466-472.
Abstract:
Researchers found unfairness in DifFServ network, to solve this problem, a TSW-based marker is proposed, which is called TCP-friendly Fair Packet Marking algo-rithm(TFPlV[). With this marker, proportional fair sharing of excess bandwidth among ag gre...
Researchers found unfairness in DifFServ network, to solve this problem, a TSW-based marker is proposed, which is called TCP-friendly Fair Packet Marking algo-rithm(TFPlV[). With this marker, proportional fair sharing of excess bandwidth among ag gre...
2004, 26(3): 473-478.
Abstract:
This paper presents a new call admission control algorithm. During call admission control period, for a particular call the algorithm admits the call with a certain probability, where the exact probability is based on the control policies decided by ...
This paper presents a new call admission control algorithm. During call admission control period, for a particular call the algorithm admits the call with a certain probability, where the exact probability is based on the control policies decided by ...
2004, 26(3): 479-483.
Abstract:
This paper brings forward a new approach for image shadow processing based on PCNN(Pulse Coupled Neural Network). The results of computer simulation show that by using PCNN shadow removal algorithm image shadow can be removed efficiently so that the ...
This paper brings forward a new approach for image shadow processing based on PCNN(Pulse Coupled Neural Network). The results of computer simulation show that by using PCNN shadow removal algorithm image shadow can be removed efficiently so that the ...
2004, 26(3): 484-488.
Abstract:
A method is proposed to solve the estimation of wideband non-Gaussian 2-D DOA in this paper. Coherent Signal-subspace Method(CSM) is used to focus the higher order statistics signal subspace at different frequency bins into a predefined subspace, the...
A method is proposed to solve the estimation of wideband non-Gaussian 2-D DOA in this paper. Coherent Signal-subspace Method(CSM) is used to focus the higher order statistics signal subspace at different frequency bins into a predefined subspace, the...
2004, 26(3): 489-494.
Abstract:
A quantizaiton method is presented to aim at the fractional saturation Synthetic Aperture Radar (SAR) raw data. Norm distribution is the basis of Block Adaptive Quantization (BAQ) algorithm. But in the application of BAQ, some trouble may encounter, ...
A quantizaiton method is presented to aim at the fractional saturation Synthetic Aperture Radar (SAR) raw data. Norm distribution is the basis of Block Adaptive Quantization (BAQ) algorithm. But in the application of BAQ, some trouble may encounter, ...
2004, 26(3): 495-499.
Abstract:
Based on the analysis of the spurious spectrum introduced by phase truncation which was made by Nicholas, the new simplified algorithm of spurious spectrum in the presence of phase truncation is presented by using the mapping mathematics and number t...
Based on the analysis of the spurious spectrum introduced by phase truncation which was made by Nicholas, the new simplified algorithm of spurious spectrum in the presence of phase truncation is presented by using the mapping mathematics and number t...
2004, 26(3): 500-504.
Abstract:
Edge Based Finite Element Method (EB-FEM) is combined with overlapping or nonoverlapping overrelaxation Domain Decomposition Method (DDM) and Boundary Integral Equation (BIE) for analyzing the electromagnetic (EM) scattering of electrically large ope...
Edge Based Finite Element Method (EB-FEM) is combined with overlapping or nonoverlapping overrelaxation Domain Decomposition Method (DDM) and Boundary Integral Equation (BIE) for analyzing the electromagnetic (EM) scattering of electrically large ope...
