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2003 Vol. 25, No. 2
Display Method:
2003, 25(2): 145-151.
Abstract:
The 3G mobile communication systems based on CDMA technique are expected to provide multi-services to mobile users. An efficient call admission control scheme is essential to provide QoS guarantees of different services to as many users as possible. ...
The 3G mobile communication systems based on CDMA technique are expected to provide multi-services to mobile users. An efficient call admission control scheme is essential to provide QoS guarantees of different services to as many users as possible. ...
2003, 25(2): 152-157.
Abstract:
In a Code Division Multiple Access (CDMA) mobile communication system which supports multiple services, such as voice, and data, the variation degree of the cell load after adding a connection is different for the services with different data, rates ...
In a Code Division Multiple Access (CDMA) mobile communication system which supports multiple services, such as voice, and data, the variation degree of the cell load after adding a connection is different for the services with different data, rates ...
2003, 25(2): 158-163.
Abstract:
This paper presents a new implementation mechanism of RED, Cooperative Adjusted RED (CARED), for the DiffServ network. It, deduces first, the quantitative relationship between the actual rate and the committed rate of services on the basis of the mar...
This paper presents a new implementation mechanism of RED, Cooperative Adjusted RED (CARED), for the DiffServ network. It, deduces first, the quantitative relationship between the actual rate and the committed rate of services on the basis of the mar...
2003, 25(2): 164-170.
Abstract:
This paper presents a new scheme of wavelet image coding, X-tree. An X-tree is a spatial hierarchical tree whose all nodes are 0 except the root node. It is the generalization of the zero tree. Based on the X-tree scheme, two new coding algorithms, t...
This paper presents a new scheme of wavelet image coding, X-tree. An X-tree is a spatial hierarchical tree whose all nodes are 0 except the root node. It is the generalization of the zero tree. Based on the X-tree scheme, two new coding algorithms, t...
2003, 25(2): 171-179.
Abstract:
Quantum cryptography is best known for key distribution. However, previous proposed proofs of security of Quantum Key Distribution (QKD) contain various technical subtleties. In this paper, a conceptually simpler proof of security of QKD is proposed....
Quantum cryptography is best known for key distribution. However, previous proposed proofs of security of Quantum Key Distribution (QKD) contain various technical subtleties. In this paper, a conceptually simpler proof of security of QKD is proposed....
2003, 25(2): 180-186.
Abstract:
Most watermarking schemes focus on the robustness and invisibility with the problem of copyright protection remained unresolved, which are their initial motivation. In this paper, a watermarking scheme is proposed to provide effective copyright prote...
Most watermarking schemes focus on the robustness and invisibility with the problem of copyright protection remained unresolved, which are their initial motivation. In this paper, a watermarking scheme is proposed to provide effective copyright prote...
2003, 25(2): 187-194.
Abstract:
One source blind extraction can be used to blind beamfonning for underwater acoustic arrays. Among existing candidate approaches such as the simple constant modulus Algorithm (CMA), Kurtosis Maximization Algorithm (KMA), etc., KMA can separate both n...
One source blind extraction can be used to blind beamfonning for underwater acoustic arrays. Among existing candidate approaches such as the simple constant modulus Algorithm (CMA), Kurtosis Maximization Algorithm (KMA), etc., KMA can separate both n...
2003, 25(2): 195-199.
Abstract:
This paper introduces weak periodic pulse signal into given chaotic system, and uses the change of system phase track which leaps from chaotic status to periodic status as the detection criterion. The given chaotic system is used to realize weak peri...
This paper introduces weak periodic pulse signal into given chaotic system, and uses the change of system phase track which leaps from chaotic status to periodic status as the detection criterion. The given chaotic system is used to realize weak peri...
2003, 25(2): 200-205.
Abstract:
In this paper, an adaptive quasi-Newton algorithm for eigensubspace estimation is analysed and proved. This algorithm is similar to power method, but its transient performance is poor than power method. Assuming one iteration to be done between snaps...
In this paper, an adaptive quasi-Newton algorithm for eigensubspace estimation is analysed and proved. This algorithm is similar to power method, but its transient performance is poor than power method. Assuming one iteration to be done between snaps...
2003, 25(2): 206-211.
Abstract:
In the paper, the method to estimate instantaneous frequency of AM-FM signals using the peak of the WVD and its performances are studied. Analysis results show that the estimation on amplitude time-varying and frequency linear modulating signals will...
In the paper, the method to estimate instantaneous frequency of AM-FM signals using the peak of the WVD and its performances are studied. Analysis results show that the estimation on amplitude time-varying and frequency linear modulating signals will...
2003, 25(2): 212-217.
Abstract:
In stretching processing system of linear FM, the frequency is in proportion to range and the delay of returns are different in different ranges. The single frequency pulses occupy different time intervals indicating the variation in time delay as a ...
In stretching processing system of linear FM, the frequency is in proportion to range and the delay of returns are different in different ranges. The single frequency pulses occupy different time intervals indicating the variation in time delay as a ...
2003, 25(2): 218-223.
Abstract:
An improved method is presented on the base of the study for the discrete-amplitude multi-resolution speech coding. New coding format is adopted through statistical analysis for signal amplitude. Then the indented adapting bit allocation is employed....
An improved method is presented on the base of the study for the discrete-amplitude multi-resolution speech coding. New coding format is adopted through statistical analysis for signal amplitude. Then the indented adapting bit allocation is employed....
2003, 25(2): 224-228.
Abstract:
This paper describes the coronary arteries of human being macroscopically and locally, and proposes a method named parameter co-restriction of spherical coordinate to model the heart, which is used to control the spatial configuration of coronary art...
This paper describes the coronary arteries of human being macroscopically and locally, and proposes a method named parameter co-restriction of spherical coordinate to model the heart, which is used to control the spatial configuration of coronary art...
2003, 25(2): 229-234.
Abstract:
The definition of frequency linearity of LFM(Lincar Frequency Modulation) is discussed in this paper. The causes for frequency linearity, phase error and spectrum unevenness during the process of generation with digital method are analyzed. The effec...
The definition of frequency linearity of LFM(Lincar Frequency Modulation) is discussed in this paper. The causes for frequency linearity, phase error and spectrum unevenness during the process of generation with digital method are analyzed. The effec...
2003, 25(2): 235-241.
Abstract:
Generalized impedance boundary conditions are employed to simulate the effect of the earths surface on electromagnetic fields. The Sommerfeld type integrals contained in the electromagnetic fields of a horizontal electric dipole over the ground plane...
Generalized impedance boundary conditions are employed to simulate the effect of the earths surface on electromagnetic fields. The Sommerfeld type integrals contained in the electromagnetic fields of a horizontal electric dipole over the ground plane...
2003, 25(2): 242-246.
Abstract:
The double-crossover Genetic Algorithm (GA) extending the basic idea of conventional Genetic Algorithms(GAs) is presented. The double-crossover GA with the double-crossover reproduction operation and parametric chromosomes gets rid of the dependence ...
The double-crossover Genetic Algorithm (GA) extending the basic idea of conventional Genetic Algorithms(GAs) is presented. The double-crossover GA with the double-crossover reproduction operation and parametric chromosomes gets rid of the dependence ...
2003, 25(2): 247-253.
Abstract:
In this paper, a novel hybrid approach is proposed in which Iterative Physical Optics (IPO)subdomain splicing technique is combined with edge-based finite element method. It is applied to the analyses of electromagnetic scattering characteristics of ...
In this paper, a novel hybrid approach is proposed in which Iterative Physical Optics (IPO)subdomain splicing technique is combined with edge-based finite element method. It is applied to the analyses of electromagnetic scattering characteristics of ...
2003, 25(2): 254-258.
Abstract:
The rapid increase in IC design complexity and greater time-to-market pressures require reuse of complex pre-defined design blocks to improve design productivity. By analyzing the communication between modules, this paper draws a conclusion that inte...
The rapid increase in IC design complexity and greater time-to-market pressures require reuse of complex pre-defined design blocks to improve design productivity. By analyzing the communication between modules, this paper draws a conclusion that inte...
2003, 25(2): 259-262.
Abstract:
Large-scale amorphous Si nanowires are prepared by heating the Si substrate at 950-1000C under the ambient of Ar/H2 (2.5104Pa) using Ni (or Au) catalyst. The nanowires have a length up to several tens micron and a diameter of 10-40 nm. A solid-liquid...
Large-scale amorphous Si nanowires are prepared by heating the Si substrate at 950-1000C under the ambient of Ar/H2 (2.5104Pa) using Ni (or Au) catalyst. The nanowires have a length up to several tens micron and a diameter of 10-40 nm. A solid-liquid...
2003, 25(2): 263-269.
Abstract:
Employing the synthetic technology with the Doppler shift, the high resolution image has been achieved by the observation of the space- or air-bome SAR (Syiitlietic. Aperture R.adar). However, unexpected Doppler shift caused by the high speed moving ...
Employing the synthetic technology with the Doppler shift, the high resolution image has been achieved by the observation of the space- or air-bome SAR (Syiitlietic. Aperture R.adar). However, unexpected Doppler shift caused by the high speed moving ...
2003, 25(2): 270-274.
Abstract:
An underwater acoustic channel blind equalization method via the blind source separation theory is presented. Constructing source signal by oversampling of the received signal, an on-line separation algorithm based on infoniax principle is employed t...
An underwater acoustic channel blind equalization method via the blind source separation theory is presented. Constructing source signal by oversampling of the received signal, an on-line separation algorithm based on infoniax principle is employed t...
2003, 25(2): 275-278.
Abstract:
In this paper, a new fast algorithm for the numerical multiplication of the points on elliptic curves is presented. By introducing 2k sequence representation for number, the length of numerical multiplication is shortened, so that the number of addit...
In this paper, a new fast algorithm for the numerical multiplication of the points on elliptic curves is presented. By introducing 2k sequence representation for number, the length of numerical multiplication is shortened, so that the number of addit...
2003, 25(2): 279-283.
Abstract:
An equivalent circuit model of micromachined gyroscope s oscillating properties is derived according to its dynamics equation. The model is implemented with the circuit simulation tool PSPICE, and can be used to analyse oscillating properties, includ...
An equivalent circuit model of micromachined gyroscope s oscillating properties is derived according to its dynamics equation. The model is implemented with the circuit simulation tool PSPICE, and can be used to analyse oscillating properties, includ...
2003, 25(2): 284-288.
Abstract:
The effective microwave refractive index (Nm) of traveling wave electrode is an important parameter in the designing of LiNbO3 electro-optic modulator. A method for mea-kiring Nm is proposed in this paper. The probe frames, microwave probe and three ...
The effective microwave refractive index (Nm) of traveling wave electrode is an important parameter in the designing of LiNbO3 electro-optic modulator. A method for mea-kiring Nm is proposed in this paper. The probe frames, microwave probe and three ...
