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2010 Vol. 32, No. 2
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2010, 32(2): 255-260.
doi: 10.3724/SP.J.1146.2009.00136
Abstract:
Current stream scheduling algorithms have to compromise their performance in heterogeneous environments. A Reconfigurable Streaming Media Scheduling (RSMS) algorithm supporting user heterogeneity is proposed. The algorithm by using catching-up stream...
Current stream scheduling algorithms have to compromise their performance in heterogeneous environments. A Reconfigurable Streaming Media Scheduling (RSMS) algorithm supporting user heterogeneity is proposed. The algorithm by using catching-up stream...
2010, 32(2): 261-266.
doi: 10.3724/SP.J.1146.2009.00135
Abstract:
How to extract and select features from time series are two important topics in time series classification. In this paper, a MNOE (Mining Non-Overlap Episode) algorithm is presented to find non-overlap frequent patterns in time series and these non-o...
How to extract and select features from time series are two important topics in time series classification. In this paper, a MNOE (Mining Non-Overlap Episode) algorithm is presented to find non-overlap frequent patterns in time series and these non-o...
2010, 32(2): 267-271.
doi: 10.3724/SP.J.1146.2008.01827
Abstract:
This paper investigates the communication network flow control with strong distributed feature and hierarchical structure, a novel network flow control model is studied by using the multi-team game model, the utility function is built up on flow rate...
This paper investigates the communication network flow control with strong distributed feature and hierarchical structure, a novel network flow control model is studied by using the multi-team game model, the utility function is built up on flow rate...
2010, 32(2): 272-277.
doi: 10.3724/SP.J.1146.2009.00299
Abstract:
Current single-stage switch structure encounters its bottleneck in scalability. This paper proposes a novel central-stage buffered scalable multistage switch structure, and establishes its mathematical model by queuing theory. For the problem of cell...
Current single-stage switch structure encounters its bottleneck in scalability. This paper proposes a novel central-stage buffered scalable multistage switch structure, and establishes its mathematical model by queuing theory. For the problem of cell...
2010, 32(2): 278-283.
doi: 10.3724/SP.J.1146.2009.00071
Abstract:
In Mobile Ad hoc Networks (MANET), it is one of the dominant factors saving a nodes battery power and improving the efficiency of network bandwidth to reduce the routing overhead for a multicast routing protocol. The roles of some nodes near the path...
In Mobile Ad hoc Networks (MANET), it is one of the dominant factors saving a nodes battery power and improving the efficiency of network bandwidth to reduce the routing overhead for a multicast routing protocol. The roles of some nodes near the path...
2010, 32(2): 284-289.
doi: 10.3724/SP.J.1146.2009.00089
Abstract:
The high dynamic topology change is the main reason to cause the frequent breakages of routes of traditional on-demand routing protocols in mobile Ad hoc networks. Therefore it is significant to extend the traditional on-demand routing protocol by th...
The high dynamic topology change is the main reason to cause the frequent breakages of routes of traditional on-demand routing protocols in mobile Ad hoc networks. Therefore it is significant to extend the traditional on-demand routing protocol by th...
2010, 32(2): 290-295.
doi: 10.3724/SP.J.1146.2009.01020
Abstract:
Accessibility has enlarged the security threats in modern space communication network, various authentication and encryption solutions are to be considered and tested for possible adoption in the space context, based on widely used space link protoco...
Accessibility has enlarged the security threats in modern space communication network, various authentication and encryption solutions are to be considered and tested for possible adoption in the space context, based on widely used space link protoco...
2010, 32(2): 296-300.
doi: 10.3724/SP.J.1146.2008.01850
Abstract:
L2C is a new civilians signal, broadcast by the modernized GPS Block IIR-M satellites. In order to access acquisition performance of GPS L2C signal, the algorithm of L2C signal is discussed firstly in the paper. That is, after acquisition of CM code ...
L2C is a new civilians signal, broadcast by the modernized GPS Block IIR-M satellites. In order to access acquisition performance of GPS L2C signal, the algorithm of L2C signal is discussed firstly in the paper. That is, after acquisition of CM code ...
2010, 32(2): 301-306.
doi: 10.3724/SP.J.1146.2008.01420
Abstract:
This paper proposes an downlink cross-layer design procedure and algorithm for On-board switch scheme based on OFDM. The ultimate objective is to maximize the system downlink throughput subject to spot beam downlink transmit power constraint, downlin...
This paper proposes an downlink cross-layer design procedure and algorithm for On-board switch scheme based on OFDM. The ultimate objective is to maximize the system downlink throughput subject to spot beam downlink transmit power constraint, downlin...
2010, 32(2): 307-312.
doi: 10.3724/SP.J.1146.2008.01801
Abstract:
An optimal iterative receiver for MIMO system need exact calculation of extrinsic information in Soft-Input-Soft-Output (SISO) detector. This optimal receiver does not fit the system with large numbers of antennas and high modulation order, because i...
An optimal iterative receiver for MIMO system need exact calculation of extrinsic information in Soft-Input-Soft-Output (SISO) detector. This optimal receiver does not fit the system with large numbers of antennas and high modulation order, because i...
2010, 32(2): 313-317.
doi: 10.3724/SP.J.1146.2009.00140
Abstract:
For UWB positioning system based on time delay estimation, there must be multiple reference nodes which increase the cost of system. If the reference source node can estimate the Time Of Arrival (TOA) and Direction Of Arrival (DOA) together, the loca...
For UWB positioning system based on time delay estimation, there must be multiple reference nodes which increase the cost of system. If the reference source node can estimate the Time Of Arrival (TOA) and Direction Of Arrival (DOA) together, the loca...
2010, 32(2): 318-322.
doi: 10.3724/SP.J.1146.2008.01575
Abstract:
By using word-oriented fault model and the technique of differential cryptanalysis, the security of SHACAL-2 against differential fault analysis is evaluated. Result shows that SHACAL-2 is not immune to such kind of attack. 8 faulty ciphertexts can r...
By using word-oriented fault model and the technique of differential cryptanalysis, the security of SHACAL-2 against differential fault analysis is evaluated. Result shows that SHACAL-2 is not immune to such kind of attack. 8 faulty ciphertexts can r...
2010, 32(2): 323-328.
doi: 10.3724/SP.J.1146.2008.01399
Abstract:
Steganography based on Quantization Index Modulation (QIM) is being increasingly threatened by steganalysis. This paper improves the existing steganographic methods embedding data in Non-uniform Discrete Cosine Transform (NDCT) domain instead of more...
Steganography based on Quantization Index Modulation (QIM) is being increasingly threatened by steganalysis. This paper improves the existing steganographic methods embedding data in Non-uniform Discrete Cosine Transform (NDCT) domain instead of more...
2010, 32(2): 329-334.
doi: 10.3724/SP.J.1146.2009.00094
Abstract:
This paper addresses new hop rate estimation schemes for hybrid DS/FH_BPSK signals which employ a novel channelized spectral enhancement preprocessor and time-frequency analysis. Good performance is achieved by following three stages. Firstly, a nonl...
This paper addresses new hop rate estimation schemes for hybrid DS/FH_BPSK signals which employ a novel channelized spectral enhancement preprocessor and time-frequency analysis. Good performance is achieved by following three stages. Firstly, a nonl...
2010, 32(2): 335-339.
doi: 10.3724/SP.J.1146.2009.00533
Abstract:
In this paper, an approach called generating function is proposed to construct Golay pair of length 2n and its mate based on conventional interleaving and concatenation method. Relationship between generating function of Golay pair and Sylvester Hada...
In this paper, an approach called generating function is proposed to construct Golay pair of length 2n and its mate based on conventional interleaving and concatenation method. Relationship between generating function of Golay pair and Sylvester Hada...
2010, 32(2): 340-344.
doi: 10.3724/SP.J.1146.2008.01287
Abstract:
A concatenated code model is proposed for high-order Low-Density Parity-Check (LDPC) coded- modulation scheme. This model is comprised of a serial concatenation of an outer LDPC encoder, an inner Binary-Decimal Conversion (BDC) encoder and a puncture...
A concatenated code model is proposed for high-order Low-Density Parity-Check (LDPC) coded- modulation scheme. This model is comprised of a serial concatenation of an outer LDPC encoder, an inner Binary-Decimal Conversion (BDC) encoder and a puncture...
2010, 32(2): 345-349.
doi: 10.3724/SP.J.1146.2008.01157
Abstract:
Burst detection plays a crucial role for burst-mode demodulation, which helps the acquisition and synchronization of data bursts. Most conventional Data-Aided (DA) burst detection approaches demands timing, and the performance degrades severely in th...
Burst detection plays a crucial role for burst-mode demodulation, which helps the acquisition and synchronization of data bursts. Most conventional Data-Aided (DA) burst detection approaches demands timing, and the performance degrades severely in th...
2010, 32(2): 350-354.
doi: 10.3724/SP.J.1146.2009.00125
Abstract:
Detection of the number of spatial signals is one of the key issues in array signal processing community. Most of the existing methods for detection of the number of signal sources require the eigenvalues of the sample covariance matrix. In this pape...
Detection of the number of spatial signals is one of the key issues in array signal processing community. Most of the existing methods for detection of the number of signal sources require the eigenvalues of the sample covariance matrix. In this pape...
2010, 32(2): 355-359.
doi: 10.3724/SP.J.1146.2009.00072
Abstract:
Signals with sinusoid modulated phase is the general form of micro-Doppler signals in radar echoes from targets with micro-motions. This paper derives the cycle spectra of this signal using its cyclostationary character, and estimates the parameters ...
Signals with sinusoid modulated phase is the general form of micro-Doppler signals in radar echoes from targets with micro-motions. This paper derives the cycle spectra of this signal using its cyclostationary character, and estimates the parameters ...
2010, 32(2): 360-365.
doi: 10.3724/SP.J.1146.2008.01830
Abstract:
This paper presents a new image denoising scheme by combining the NonSubsampled Contourlet Transform (NSCT) and adaptive total variation model. The original image is first decomposed using NSCT and the image model is built based on Gaussian Scale Mix...
This paper presents a new image denoising scheme by combining the NonSubsampled Contourlet Transform (NSCT) and adaptive total variation model. The original image is first decomposed using NSCT and the image model is built based on Gaussian Scale Mix...
2010, 32(2): 366-370.
doi: 10.3724/SP.J.1146.2009.00044
Abstract:
The phased array radar with adaptive digital beamforming usually adopts subarray configuration. Subarray configuration has obvious influence on system performance, therefore the optimal subarray division has important significance in both theoretics ...
The phased array radar with adaptive digital beamforming usually adopts subarray configuration. Subarray configuration has obvious influence on system performance, therefore the optimal subarray division has important significance in both theoretics ...
2010, 32(2): 371-376.
doi: 10.3724/SP.J.1146.2009.00017
Abstract:
This paper mainly studies the application of the combination of Hurst exponent and variable step-size LMS algorithm in low-observable target detection in sea clutter. Up to now, fractal theory and statistic theory are applied to target detection resp...
This paper mainly studies the application of the combination of Hurst exponent and variable step-size LMS algorithm in low-observable target detection in sea clutter. Up to now, fractal theory and statistic theory are applied to target detection resp...
2010, 32(2): 377-382.
doi: 10.3724/SP.J.1146.2009.00024
Abstract:
Noise Frequency Modulated Continuous Wave (FMCW) radar has an ideal thumbtack ambiguity function, and unambiguous measurement of distance and velocity due to the nonperiodicity of its transmitting signal, so it is suitable for detecting high-speed an...
Noise Frequency Modulated Continuous Wave (FMCW) radar has an ideal thumbtack ambiguity function, and unambiguous measurement of distance and velocity due to the nonperiodicity of its transmitting signal, so it is suitable for detecting high-speed an...
2010, 32(2): 383-387.
doi: 10.3724/SP.J.1146.2009.00102
Abstract:
This paper firstly setups the geometric model of the tandem bistatic squint SAR and presents the mathematic expression of the radar echoes, then its two-dimensional frequency spectrum is derived and its characteristic is analyzed. In two-dimensional ...
This paper firstly setups the geometric model of the tandem bistatic squint SAR and presents the mathematic expression of the radar echoes, then its two-dimensional frequency spectrum is derived and its characteristic is analyzed. In two-dimensional ...
2010, 32(2): 388-393.
doi: 10.3724/SP.J.1146.2009.00095
Abstract:
In order to remove the fluctuant interference such as swaying branches，stochastic shaking of camera in complex environments when moving targets are detected in video sequences, A new algorithm of moving targets detection based on video windows partit...
In order to remove the fluctuant interference such as swaying branches，stochastic shaking of camera in complex environments when moving targets are detected in video sequences, A new algorithm of moving targets detection based on video windows partit...
2010, 32(2): 394-399.
doi: 10.3724/SP.J.1146.2009.00115
Abstract:
Compositing is the most common form of digital image forging. For a class of JPEG image forgery, a simple and effective detecting algorithm is proposed on the basis of inconsistencies of blocking artifacts between tampered region and non-tampered reg...
Compositing is the most common form of digital image forging. For a class of JPEG image forgery, a simple and effective detecting algorithm is proposed on the basis of inconsistencies of blocking artifacts between tampered region and non-tampered reg...
2010, 32(2): 400-404.
doi: 10.3724/SP.J.1146.2009.00068
Abstract:
For fluid motion image computation (PIV), a nonlinear filtering based PIV approach was proposed which can obtain reliable motion vector, div and curl fileds. As variational based PIV approaches the new approach is a nonlinear filtering process instea...
For fluid motion image computation (PIV), a nonlinear filtering based PIV approach was proposed which can obtain reliable motion vector, div and curl fileds. As variational based PIV approaches the new approach is a nonlinear filtering process instea...
2010, 32(2): 405-410.
doi: 10.3724/SP.J.1146.2009.00099
Abstract:
To address the lattice size exponential explosion problem in large scale data and rule mining, concept coverage density function and measurement model are introduced to reduce redundant concepts. The pruned lattice, named marked-concept lattice, has ...
To address the lattice size exponential explosion problem in large scale data and rule mining, concept coverage density function and measurement model are introduced to reduce redundant concepts. The pruned lattice, named marked-concept lattice, has ...
2010, 32(2): 411-415.
doi: 10.3724/SP.J.1146.2008.01740
Abstract:
Object tracking by using single color feature results in a poor performance in robustness. To solve this problem, an object tracking method based on multi-features fusion is presented. The proposed method uses the color and texture features extracted...
Object tracking by using single color feature results in a poor performance in robustness. To solve this problem, an object tracking method based on multi-features fusion is presented. The proposed method uses the color and texture features extracted...
2010, 32(2): 416-421.
doi: 10.3724/SP.J.1146.2008.01461
Abstract:
It is important to locate the center of distorted pupil in eye tracking process. To tackle the issues induced by distortion and disturbance, a new Random Sample Consensus algorithm based on only 3 points, named RANSAC_3, is proposed in this paper. El...
It is important to locate the center of distorted pupil in eye tracking process. To tackle the issues induced by distortion and disturbance, a new Random Sample Consensus algorithm based on only 3 points, named RANSAC_3, is proposed in this paper. El...
2010, 32(2): 422-426.
doi: 10.3724/SP.J.1146.2008.01088
Abstract:
An image fusion algorithm in nonsubsampled Contourlet domain is presented based on Human Visual System (HVS) and source image characteristics. Moreover, the influence on fusion result of decomposition levels and directional decomposition numbers is d...
An image fusion algorithm in nonsubsampled Contourlet domain is presented based on Human Visual System (HVS) and source image characteristics. Moreover, the influence on fusion result of decomposition levels and directional decomposition numbers is d...
2010, 32(2): 427-432.
doi: 10.3724/SP.J.1146.2008.00983
Abstract:
To deal with the false and unstable corners, high computational complexity and incorrect matching, a new image registration algorithm is proposed based on corners which are well-distributed in image and with sub-pixel localization precision. Firstly ...
To deal with the false and unstable corners, high computational complexity and incorrect matching, a new image registration algorithm is proposed based on corners which are well-distributed in image and with sub-pixel localization precision. Firstly ...
2010, 32(2): 433-438.
doi: 10.3724/SP.J.1146.2009.00064
Abstract:
This paper is concerned with the problem of handwritten digits recognition in high dimensional feature space. The residual feature information may bring undesirable complexity to the underlying probability distribution of the concept label for learni...
This paper is concerned with the problem of handwritten digits recognition in high dimensional feature space. The residual feature information may bring undesirable complexity to the underlying probability distribution of the concept label for learni...
2010, 32(2): 439-443.
doi: 10.3724/SP.J.1146.2009.00142
Abstract:
This paper presents a universality method for measure of security in steganography. According to the definition of K-L divergence and the properties of security in steganography, some limitations in Cachins definition of security are shown in the beg...
This paper presents a universality method for measure of security in steganography. According to the definition of K-L divergence and the properties of security in steganography, some limitations in Cachins definition of security are shown in the beg...
2010, 32(2): 444-448.
doi: 10.3724/SP.J.1146.2009.00263
Abstract:
The existing fault-tolerant scheduling algorithms are mainly based on primary/backup copies technology and the utilization of processor decreases greatly with the number of faults increases. In this paper, a real-time fault-tolerant scheduling algori...
The existing fault-tolerant scheduling algorithms are mainly based on primary/backup copies technology and the utilization of processor decreases greatly with the number of faults increases. In this paper, a real-time fault-tolerant scheduling algori...
2010, 32(2): 449-453.
doi: 10.3724/SP.J.1146.2009.00096
Abstract:
The high-frequency method for solving the scattering from electrically large conductive targets in half space is presented in this paper. The High-frequency method is deduced by introducing the half-space Greens function into the conventional method ...
The high-frequency method for solving the scattering from electrically large conductive targets in half space is presented in this paper. The High-frequency method is deduced by introducing the half-space Greens function into the conventional method ...
2010, 32(2): 454-458.
doi: 10.3724/SP.J.1146.2009.00111
Abstract:
Photonic BandGap (PBG) is man-made periodic dielectric structure, which may control the propagation of electromagnetic waves in certain frequency range. And the Uniplanar Compact Photonic BandGap (UC-PBG) is a periodic photonic bandgap on a conductor...
Photonic BandGap (PBG) is man-made periodic dielectric structure, which may control the propagation of electromagnetic waves in certain frequency range. And the Uniplanar Compact Photonic BandGap (UC-PBG) is a periodic photonic bandgap on a conductor...
2010, 32(2): 459-463.
doi: 10.3724/SP.J.1146.2008.00233
Abstract:
Based on the linear theory of gyro-TWA, this paper is focused on the numerical simulations for the relations of the starting length and starting frequency with beam radius, voltage, velocity ratio, beam current and magnetic field for a gyro-BWO opera...
Based on the linear theory of gyro-TWA, this paper is focused on the numerical simulations for the relations of the starting length and starting frequency with beam radius, voltage, velocity ratio, beam current and magnetic field for a gyro-BWO opera...
2010, 32(2): 464-469.
doi: 10.3724/SP.J.1146.2009.00116
Abstract:
For audio signals with input frequency between 20 Hz and 24 kHz, a switch-capacitor feed-forward A/D modulator in 0.18m Logic technology is proposed in this paper, which gains 16 bit resolution with 1.2 V supply voltage. The modulator can achieve 102...
For audio signals with input frequency between 20 Hz and 24 kHz, a switch-capacitor feed-forward A/D modulator in 0.18m Logic technology is proposed in this paper, which gains 16 bit resolution with 1.2 V supply voltage. The modulator can achieve 102...
2010, 32(2): 476-480.
doi: 10.3724/SP.J.1146.2008.01819
Abstract:
The ocean backscatter simulation is an important work for the ocean radar remote sensing application research and the design of the radar system for the ocean surveillance. Most of the ocean backscatter simulation models are based on the composite su...
The ocean backscatter simulation is an important work for the ocean radar remote sensing application research and the design of the radar system for the ocean surveillance. Most of the ocean backscatter simulation models are based on the composite su...
2010, 32(2): 481-484.
doi: 10.3724/SP.J.1146.2009.00705
Abstract:
An idea that an arbitrary transmit beampattern can be equal to a sum of the most basic beams is proposed. Based on the idea and using the Chebyshev weighting technique, the most basic beams are constructed with low side-lobes for a Multiple Input Mul...
An idea that an arbitrary transmit beampattern can be equal to a sum of the most basic beams is proposed. Based on the idea and using the Chebyshev weighting technique, the most basic beams are constructed with low side-lobes for a Multiple Input Mul...
2010, 32(2): 485-489.
doi: 10.3724/SP.J.1146.2008.01770
Abstract:
In the designation of the real-time imaging machine of Mini SAR, the radar return signal is sampled in the intermediate frequency, then Digital Down Converter(DDC) is used to realize quadrature demodulate, which can reduce system complexity and impro...
In the designation of the real-time imaging machine of Mini SAR, the radar return signal is sampled in the intermediate frequency, then Digital Down Converter(DDC) is used to realize quadrature demodulate, which can reduce system complexity and impro...
2010, 32(2): 490-494.
doi: 10.3724/SP.J.1146.2009.00025
Abstract:
Analog SAR echoes are usually sampled in both azimuth and range for digital processing, which will introduce error to point target peak measurements. This problem is analyzed in detail and the theoretical relationship between peak error and target lo...
Analog SAR echoes are usually sampled in both azimuth and range for digital processing, which will introduce error to point target peak measurements. This problem is analyzed in detail and the theoretical relationship between peak error and target lo...
2010, 32(2): 495-499.
doi: 10.3724/SP.J.1146.2009.00284
Abstract:
To solve the occlusion of multi touch, this paper presents a multi-touch locating method based on the collaboration of four cameras. It uses four cameras fixed at each corner of the frame to capture images synchronously, detects objects in each camer...
To solve the occlusion of multi touch, this paper presents a multi-touch locating method based on the collaboration of four cameras. It uses four cameras fixed at each corner of the frame to capture images synchronously, detects objects in each camer...
2010, 32(2): 500-503.
doi: 10.3724/SP.J.1146.2009.00070
Abstract:
MDS matrices and involution MDS matrices are widely used in block ciphers. This paper deals with those MDS matrices which are Hadamard matrices and Cauchy matrices simultaneously. Then the structure, the method of constructing and the count value of ...
MDS matrices and involution MDS matrices are widely used in block ciphers. This paper deals with those MDS matrices which are Hadamard matrices and Cauchy matrices simultaneously. Then the structure, the method of constructing and the count value of ...
2010, 32(2): 504-508.
doi: 10.3724/SP.J.1146.2009.00051
Abstract:
In this paper, an efficient hybrid sampling algorithm introducing the random walk method into the reversible jump Markov Chain Monte Carlo (RJMCMC) method is developed to jointly detect and estimate the wideband signals impinging on passive sensors, ...
In this paper, an efficient hybrid sampling algorithm introducing the random walk method into the reversible jump Markov Chain Monte Carlo (RJMCMC) method is developed to jointly detect and estimate the wideband signals impinging on passive sensors, ...
2010, 32(2): 470-475.
doi: 10.3724/SP.J.1146.2009.00497
Abstract:
The problems of how to reduce the sampling rate in the broadband analog signal digitization and how to compress effectively the large amount of data for storage are always concerned by researchers. The recent proposed Compressive Sampling or Compress...
The problems of how to reduce the sampling rate in the broadband analog signal digitization and how to compress effectively the large amount of data for storage are always concerned by researchers. The recent proposed Compressive Sampling or Compress...
