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2004 Vol. 26, No. 7
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2004, 26(7): 1009-1016.
Abstract:
In order to improve the spectral efficiency, this paper proposes a new framework for designing a modulation consisting of more than one modulation method. The new modulation method is able to provide better spectral efficiency while preserving the me...
In order to improve the spectral efficiency, this paper proposes a new framework for designing a modulation consisting of more than one modulation method. The new modulation method is able to provide better spectral efficiency while preserving the me...
2004, 26(7): 1017-1023.
Abstract:
Signal-to-Noise SKew Ratio (SNSKR) is defined and its mathematical formula is obtained. A novel analysis based on the SNSKR is presented. When ambient noise is asymmetrical distributed noise, the SNSKR is equal to or greater than the original Signal-...
Signal-to-Noise SKew Ratio (SNSKR) is defined and its mathematical formula is obtained. A novel analysis based on the SNSKR is presented. When ambient noise is asymmetrical distributed noise, the SNSKR is equal to or greater than the original Signal-...
2004, 26(7): 1024-1029.
Abstract:
This paper does more research on families of dyadic complementary codes pairs. Firstly, a new block design(dyadic addition set pairs) is presented. Secondly, the equivalent relationship between families of dyadic complementary code pairs and the new ...
This paper does more research on families of dyadic complementary codes pairs. Firstly, a new block design(dyadic addition set pairs) is presented. Secondly, the equivalent relationship between families of dyadic complementary code pairs and the new ...
2004, 26(7): 1030-1037.
Abstract:
In this paper, a low-complexity DOA estimation algorithm is presented for asynchronous DS-CDMA systems with multipath propagation. First, the influence of multiacess interferences and noise is eliminated. Then, a group of correlation matrices constit...
In this paper, a low-complexity DOA estimation algorithm is presented for asynchronous DS-CDMA systems with multipath propagation. First, the influence of multiacess interferences and noise is eliminated. Then, a group of correlation matrices constit...
2004, 26(7): 1038-1044.
Abstract:
In TDD-CDMA system, the different asymmetrical requirements between uplink (UL) and downlink (DL) in different Base Station (BS) and different time will generate serious inter-cell interference. From the interference point of view, Dynamic Channel Al...
In TDD-CDMA system, the different asymmetrical requirements between uplink (UL) and downlink (DL) in different Base Station (BS) and different time will generate serious inter-cell interference. From the interference point of view, Dynamic Channel Al...
2004, 26(7): 1045-1052.
Abstract:
Several emerging internet services by multicast force the research on secure multicast, and the research on key update is a big challenge. This paper designs a hash function of variable message digest and variable key length for a key update protocol...
Several emerging internet services by multicast force the research on secure multicast, and the research on key update is a big challenge. This paper designs a hash function of variable message digest and variable key length for a key update protocol...
2004, 26(7): 1053-1056.
Abstract:
A new key management scheme applied for large dynamic multicast group is proposed in this paper. In the hierarchical structure one-way hash chain is used as transmission key to transmit the data between the levels. Digital envelope is used to realize...
A new key management scheme applied for large dynamic multicast group is proposed in this paper. In the hierarchical structure one-way hash chain is used as transmission key to transmit the data between the levels. Digital envelope is used to realize...
2004, 26(7): 1057-1063.
Abstract:
The security of several typical chaotic synchronized secure communication schemes , as well as the respective unmasking methods are studied to find the way to improve the security. A new secure communication scheme based on active-passive decompositi...
The security of several typical chaotic synchronized secure communication schemes , as well as the respective unmasking methods are studied to find the way to improve the security. A new secure communication scheme based on active-passive decompositi...
Image Compression Based on Integer Wavelet Transform and Improved Embedded Zerotree Wavelet Encoding
2004, 26(7): 1064-1069.
Abstract:
The main advantages of Integer Wavelet Transform(IWT) are that the input and output values are all integers, all operations can be done in place, only a small memory is required and easy to be implemented in hardware. In the context of image coding, ...
The main advantages of Integer Wavelet Transform(IWT) are that the input and output values are all integers, all operations can be done in place, only a small memory is required and easy to be implemented in hardware. In the context of image coding, ...
2004, 26(7): 1070-1075.
Abstract:
A kind of interpolator, called the modified pixel-filled interpolator, is advanced for images enlarged the same integer times in lines as that in columns. The principle a.iul the implement method in software and hardware of the interpolator are given...
A kind of interpolator, called the modified pixel-filled interpolator, is advanced for images enlarged the same integer times in lines as that in columns. The principle a.iul the implement method in software and hardware of the interpolator are given...
2004, 26(7): 1076-1081.
Abstract:
A multi-level elimination algorithm for fast motion estimation is proposed in this paper. The most matched block of the current block is detected in the next frame with a multi-level elimination strategy in this algorithm. In the first level, some ca...
A multi-level elimination algorithm for fast motion estimation is proposed in this paper. The most matched block of the current block is detected in the next frame with a multi-level elimination strategy in this algorithm. In the first level, some ca...
2004, 26(7): 1082-1087.
Abstract:
In this paper, Dolby AC3 standard is used as the audio decoding standard to research the hardware/software co-design method of HDTV audio decoding based on Virgo-IP-Core and a new method is present to realize the hardware/software partition by settin...
In this paper, Dolby AC3 standard is used as the audio decoding standard to research the hardware/software co-design method of HDTV audio decoding based on Virgo-IP-Core and a new method is present to realize the hardware/software partition by settin...
2004, 26(7): 1088-1093.
Abstract:
The effect of the multiple-user interference, the receiver shot noise, ambient light interference, the receiver dark current and the thermal noise are taken into account. A probability union bound and the pessimistic estimation method are used that d...
The effect of the multiple-user interference, the receiver shot noise, ambient light interference, the receiver dark current and the thermal noise are taken into account. A probability union bound and the pessimistic estimation method are used that d...
2004, 26(7): 1094-1100.
Abstract:
When the total transmitting power is limited, the authors investigate the effect of different power allocation schemes on the side-information and the arithmetic to obtain the optimal power allocation coefficient for the system with Partial Transmit ...
When the total transmitting power is limited, the authors investigate the effect of different power allocation schemes on the side-information and the arithmetic to obtain the optimal power allocation coefficient for the system with Partial Transmit ...
2004, 26(7): 1101-1106.
Abstract:
The congestion control mechanisms used in Internet have been the focus of numerous studies and have undergone a number of enhancements. However, even with these enhancements, TCP connections still experience alarmingly high loss rates, especially dur...
The congestion control mechanisms used in Internet have been the focus of numerous studies and have undergone a number of enhancements. However, even with these enhancements, TCP connections still experience alarmingly high loss rates, especially dur...
2004, 26(7): 1107-1113.
Abstract:
In saturated IEEE 802.11 WLAN, the energy consumption in transmission per frame through basic mode and RTS/CTS mode is analyzed through mathematical model. The relation of RTS threshold and average energy consumption per frame is produced in the assu...
In saturated IEEE 802.11 WLAN, the energy consumption in transmission per frame through basic mode and RTS/CTS mode is analyzed through mathematical model. The relation of RTS threshold and average energy consumption per frame is produced in the assu...
2004, 26(7): 1114-1119.
Abstract:
In WDM networks, the bandwidth request of a traffic stream can be much lower than the capacity of a wavelength. Traffic grooming can aggregate low-rate connections onto high-capacity lightpaths to make full use of the bandwidth. But most of the resea...
In WDM networks, the bandwidth request of a traffic stream can be much lower than the capacity of a wavelength. Traffic grooming can aggregate low-rate connections onto high-capacity lightpaths to make full use of the bandwidth. But most of the resea...
2004, 26(7): 1120-1125.
Abstract:
Design and realization of a real-time high-resolution SAR data processing system is proposed. By the adoption of PowerPC G4 as DSP, VME as system bus and RACE++ as high speed data exchange path, this stable system has great performance and flexible e...
Design and realization of a real-time high-resolution SAR data processing system is proposed. By the adoption of PowerPC G4 as DSP, VME as system bus and RACE++ as high speed data exchange path, this stable system has great performance and flexible e...
2004, 26(7): 1126-1130.
Abstract:
This paper studies the imaging of moving target in the situation of the bistatic synthetic aperture radar with stationary transmitter. The WVD-Radon method is used to estimate the Doppler frequency parameter of the moving target, and to adjust the pa...
This paper studies the imaging of moving target in the situation of the bistatic synthetic aperture radar with stationary transmitter. The WVD-Radon method is used to estimate the Doppler frequency parameter of the moving target, and to adjust the pa...
2004, 26(7): 1131-1136.
Abstract:
Using the perfect properties of Radial Basis Function (RBF) neural networks, such as approximation any non-linear mapping and quick convergence, a new scheme is proposed to estimate scaling factors for radar CFAR detectors. Owing to few constraints, ...
Using the perfect properties of Radial Basis Function (RBF) neural networks, such as approximation any non-linear mapping and quick convergence, a new scheme is proposed to estimate scaling factors for radar CFAR detectors. Owing to few constraints, ...
2004, 26(7): 1137-1143.
Abstract:
Eigen-subspace and canonical-subspace methods are studied and applied to feature-extraction for target recognition using range profiles of a High-range-Resolution-Radar (HRR) system. Based on this study, a subspace cluster method is proposed to tackl...
Eigen-subspace and canonical-subspace methods are studied and applied to feature-extraction for target recognition using range profiles of a High-range-Resolution-Radar (HRR) system. Based on this study, a subspace cluster method is proposed to tackl...
2004, 26(7): 1144-1149.
Abstract:
A fast effective algorithm is developed for the road identification problem in ground target tracking. A mathematic model of road identification problem is provided and the problem is related with a positive definite quadratic programming problem wit...
A fast effective algorithm is developed for the road identification problem in ground target tracking. A mathematic model of road identification problem is provided and the problem is related with a positive definite quadratic programming problem wit...
2004, 26(7): 1150-1156.
Abstract:
Since the information fails to be expressed integrally in the agent organization model constructed by the single Aalaadin meta-model and it appears difficult in directly modeling with Agent Unified Modeling Language (AUML), a new modeling method (i.e...
Since the information fails to be expressed integrally in the agent organization model constructed by the single Aalaadin meta-model and it appears difficult in directly modeling with Agent Unified Modeling Language (AUML), a new modeling method (i.e...
2004, 26(7): 1157-1162.
Abstract:
In the light of most current segmentation algorithms are of high complexity and huge computation, one algorithm of coarse segmentation in compressed domain and refined segmentation in spatial domain is put forward. The initial coarse segmentation mas...
In the light of most current segmentation algorithms are of high complexity and huge computation, one algorithm of coarse segmentation in compressed domain and refined segmentation in spatial domain is put forward. The initial coarse segmentation mas...
2004, 26(7): 1163-1167.
Abstract:
This paper researches mainly 011 the network traffic sampling measurement methods. The Stratified Random Double Sampling method based on Event-driven (ESRDS) is proposed. Its performance is proved to be better than traditional methods in analyzing th...
This paper researches mainly 011 the network traffic sampling measurement methods. The Stratified Random Double Sampling method based on Event-driven (ESRDS) is proposed. Its performance is proved to be better than traditional methods in analyzing th...
2004, 26(7): 1168-1172.
Abstract:
Spaceborne Electronic Power Controller(EPC) works in severe environment and its lifetime must be over 3 years. Therefore its reliability should be under great consideration. This paper, analyzes on the reliability of EPC used in weather satellite and...
Spaceborne Electronic Power Controller(EPC) works in severe environment and its lifetime must be over 3 years. Therefore its reliability should be under great consideration. This paper, analyzes on the reliability of EPC used in weather satellite and...
2004, 26(7): 1173-1176.
Abstract:
In this paper, a method of automatic gain control for synthetic aperture radar is given. In this way, radar signal is processed in two dimensions. Comparison to the traditional AGC, this method keeps the properties of signal and widens the dynamic ra...
In this paper, a method of automatic gain control for synthetic aperture radar is given. In this way, radar signal is processed in two dimensions. Comparison to the traditional AGC, this method keeps the properties of signal and widens the dynamic ra...
