Email alert
2002 Vol. 24, No. 6
Display Method:
2002, 24(6): 721-725.
Abstract:
To support different QoS services in HFC, the CMTS scheduling algorithm should be analyzed carefully. However, in the most important standard-MCNS DOCSIS 1.1, no specific scheduling is prescribed, and many papers have discussed it with modified First...
To support different QoS services in HFC, the CMTS scheduling algorithm should be analyzed carefully. However, in the most important standard-MCNS DOCSIS 1.1, no specific scheduling is prescribed, and many papers have discussed it with modified First...
2002, 24(6): 726-734.
Abstract:
This paper presents an enhancement of flow control mechanism of traditional TCP, which is called as differentiated service Fast-TCP policy. Considering relative flow control, scheduling and queuing mechanisms, an effective implementation scheme of th...
This paper presents an enhancement of flow control mechanism of traditional TCP, which is called as differentiated service Fast-TCP policy. Considering relative flow control, scheduling and queuing mechanisms, an effective implementation scheme of th...
2002, 24(6): 735-743.
Abstract:
In this paper, joint estimation of the number of active users, active users and their timing in asynchronous CDMA systems are discussed. The subspace based method to oversampling received signal model is applied to identify the number of active users...
In this paper, joint estimation of the number of active users, active users and their timing in asynchronous CDMA systems are discussed. The subspace based method to oversampling received signal model is applied to identify the number of active users...
2002, 24(6): 744-750.
Abstract:
This paper focuses on the design of high quality speech coding with variable rate at 0.75～5.4kb/s. The new algorithm classifies input speech signals as noise, unvoiced speech, transitional speech and voiced speech, and it uses different codebooks as ...
This paper focuses on the design of high quality speech coding with variable rate at 0.75～5.4kb/s. The new algorithm classifies input speech signals as noise, unvoiced speech, transitional speech and voiced speech, and it uses different codebooks as ...
2002, 24(6): 751-757.
Abstract:
Throughput performance for Slotted ALOHA DS/CDMA (S-ALOHA-DS/CDMA) and Multicarrier Slotted ALOHA (MC-S-ALOHA) systems is performed and compared in this paper. Theory analysis and computer simulation results of throughput of S-ALOHA-DS/CDMA are obtai...
Throughput performance for Slotted ALOHA DS/CDMA (S-ALOHA-DS/CDMA) and Multicarrier Slotted ALOHA (MC-S-ALOHA) systems is performed and compared in this paper. Theory analysis and computer simulation results of throughput of S-ALOHA-DS/CDMA are obtai...
2002, 24(6): 758-764.
Abstract:
The optimizing design of chaotic synchronization system by combining feedback control with wavelet transformation is presented in this paper. In the transmitter, a part of signals is transformed by wavelet and the detail information is removed. In th...
The optimizing design of chaotic synchronization system by combining feedback control with wavelet transformation is presented in this paper. In the transmitter, a part of signals is transformed by wavelet and the detail information is removed. In th...
2002, 24(6): 765-772.
Abstract:
This paper investigates the optimal packet length for AAL2 packet voice system without bit dropping, which takes into consideration the features and quality of service of AAL2 packet voice. A conclusion is drawn that the optimal packet length is abou...
This paper investigates the optimal packet length for AAL2 packet voice system without bit dropping, which takes into consideration the features and quality of service of AAL2 packet voice. A conclusion is drawn that the optimal packet length is abou...
2002, 24(6): 773-780.
Abstract:
A pilot-based serial multipath interference cancellation method and the corresponding RAKE receiver are proposed. Theoretical analysis and computer simulations are carried out, and comparison with conventional RAKE receiver is performed. It is shown ...
A pilot-based serial multipath interference cancellation method and the corresponding RAKE receiver are proposed. Theoretical analysis and computer simulations are carried out, and comparison with conventional RAKE receiver is performed. It is shown ...
2002, 24(6): 781-788.
Abstract:
The general composition of IC arc prepayment product systems is briefly introduced. Three topics are investigated: the password security of the IC card, encrypting and checking the data on the IC card, and a novel comprehensive data security design s...
The general composition of IC arc prepayment product systems is briefly introduced. Three topics are investigated: the password security of the IC card, encrypting and checking the data on the IC card, and a novel comprehensive data security design s...
2002, 24(6): 789-793.
Abstract:
This paper presents a study on application of regularized Gaussian classifier to Raman spectroscopy signals pattern recognition. Each Raman spectrum is treated as a point in high dimensional vector space. For given samples, the statistical model is u...
This paper presents a study on application of regularized Gaussian classifier to Raman spectroscopy signals pattern recognition. Each Raman spectrum is treated as a point in high dimensional vector space. For given samples, the statistical model is u...
2002, 24(6): 794-799.
Abstract:
To describe contours in digital space and simplify the presentation of computer graphics, a wavelet descriptor is presented, which is suitable for contours constructed with a set of points. According to the fact that contours in digital space is peri...
To describe contours in digital space and simplify the presentation of computer graphics, a wavelet descriptor is presented, which is suitable for contours constructed with a set of points. According to the fact that contours in digital space is peri...
2002, 24(6): 800-804.
Abstract:
MEGs inversion is an important aspect in MEG studies. Generally, global optimization methods are usually used on estimating parameters of multidipole source, but these methods are of low convergence speed. To increase the computing speed, a strategy ...
MEGs inversion is an important aspect in MEG studies. Generally, global optimization methods are usually used on estimating parameters of multidipole source, but these methods are of low convergence speed. To increase the computing speed, a strategy ...
2002, 24(6): 805-810.
Abstract:
A general methodology of key-generation of noise-like by use of chaotic process of tent-map function is described in this paper, a mathematics model of noise-like chaotic coding memory is constructed, meanwhile the basic mechanism of circulant convol...
A general methodology of key-generation of noise-like by use of chaotic process of tent-map function is described in this paper, a mathematics model of noise-like chaotic coding memory is constructed, meanwhile the basic mechanism of circulant convol...
2002, 24(6): 811-815.
Abstract:
In this paper, using the stochastic resonance technique, the detection method of weak signal is simulated, then the increasing of SNR and the detecting of weak signal are investigated. And the signal passing through the stochastic resonator is compar...
In this paper, using the stochastic resonance technique, the detection method of weak signal is simulated, then the increasing of SNR and the detecting of weak signal are investigated. And the signal passing through the stochastic resonator is compar...
2002, 24(6): 816-820.
Abstract:
In this paper, the imaging theories for the squint mode SAR. are discussed. Basing on the discuss of the difference between the centric side-looking and squint mode SAR, a new imaging algorithm for squint mode SAR is presented. By this algorithm, hig...
In this paper, the imaging theories for the squint mode SAR. are discussed. Basing on the discuss of the difference between the centric side-looking and squint mode SAR, a new imaging algorithm for squint mode SAR is presented. By this algorithm, hig...
2002, 24(6): 821-826.
Abstract:
An approximate method is used to analyse the excited fields with a non-symmetrical dipole in lossy media and simple analytical expressions about the fields and joule heat are obtained. These expressions are compared with the formulas of traditional s...
An approximate method is used to analyse the excited fields with a non-symmetrical dipole in lossy media and simple analytical expressions about the fields and joule heat are obtained. These expressions are compared with the formulas of traditional s...
2002, 24(6): 827-832.
Abstract:
It is always the goal of the control systems design that ensuring the system robust stability and satisfying the requirements of the system performance specifications at the same time. In this paper, based on the requirements of stability and perform...
It is always the goal of the control systems design that ensuring the system robust stability and satisfying the requirements of the system performance specifications at the same time. In this paper, based on the requirements of stability and perform...
2002, 24(6): 833-837.
Abstract:
Power penalty of crosstalk in 17 cylindrical mixing-rod plastic optical coupler (17 CMRC) is studied. Theoretical model on the relationship between inter-port crosstalk in 17 CMRC, power penalty and bit error rate (BER) is built. The model indicates ...
Power penalty of crosstalk in 17 cylindrical mixing-rod plastic optical coupler (17 CMRC) is studied. Theoretical model on the relationship between inter-port crosstalk in 17 CMRC, power penalty and bit error rate (BER) is built. The model indicates ...
2002, 24(6): 838-844.
Abstract:
Based on the hydro-dynamics energy transport model, the influence of geometrical structure parameters on hot-carrier-effect immunity in deep-submicron grooved gate PMOSFET is studied and explained in terms of device interior physics mechanism. These ...
Based on the hydro-dynamics energy transport model, the influence of geometrical structure parameters on hot-carrier-effect immunity in deep-submicron grooved gate PMOSFET is studied and explained in terms of device interior physics mechanism. These ...
2002, 24(6): 845-849.
Abstract:
In this paper, an efficient method for speaker recognition-the combination of VQ (Vector-Quantization) algorithm with fuzzy C-mean clustering algorithm is proposed. This algorithm extracts 12th order LPC cepstrum coefficients from speech signals and ...
In this paper, an efficient method for speaker recognition-the combination of VQ (Vector-Quantization) algorithm with fuzzy C-mean clustering algorithm is proposed. This algorithm extracts 12th order LPC cepstrum coefficients from speech signals and ...
2002, 24(6): 850-854.
Abstract:
This paper presents a balancing admission mechanism of wide band and narrow band calls in ATM networks. The combination of the mechanism with CAC can guarantee the fair admission of all kinds of calls. This paper also analyzes the probabilities of wi...
This paper presents a balancing admission mechanism of wide band and narrow band calls in ATM networks. The combination of the mechanism with CAC can guarantee the fair admission of all kinds of calls. This paper also analyzes the probabilities of wi...
2002, 24(6): 855-859.
Abstract:
This paper studies the generalized synchronization of hyperchaotic circuit . Theoretical analysis demonstrates that if a matrix and its commutative matrix can be built, generalized synchronization of driving system and driven system can be realized. ...
This paper studies the generalized synchronization of hyperchaotic circuit . Theoretical analysis demonstrates that if a matrix and its commutative matrix can be built, generalized synchronization of driving system and driven system can be realized. ...
2002, 24(6): 860-864.
Abstract:
The new optical methods for measuring electric energy utilizing the Faradays magneto-optical effect and the Pockel effect of some transparent material with single chip computer technology are proposed in this paper. The principle is discussed compreh...
The new optical methods for measuring electric energy utilizing the Faradays magneto-optical effect and the Pockel effect of some transparent material with single chip computer technology are proposed in this paper. The principle is discussed compreh...
