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2011 Vol. 33, No. 2
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2011, 33(2): 255-259.
doi: 10.3724/SP.J.1146.2010.00398
Abstract:
Because of the characteristics of Internet best-effort and the complexity of the access network structure, it is difficult to meet the quality of services such as long range depend real-time interaction streaming media for Next Generation Broadcastin...
Because of the characteristics of Internet best-effort and the complexity of the access network structure, it is difficult to meet the quality of services such as long range depend real-time interaction streaming media for Next Generation Broadcastin...
2011, 33(2): 260-265.
doi: 10.3724/SP.J.1146.2010.00438
Abstract:
Although network coding is an effective technology to improve the performance of multicast communication, encoding of node brings the additional overhead. In order to overcome this limitation, this paper proposes a network coding optimization model u...
Although network coding is an effective technology to improve the performance of multicast communication, encoding of node brings the additional overhead. In order to overcome this limitation, this paper proposes a network coding optimization model u...
2011, 33(2): 266-271.
doi: 10.3724/SP.J.1146.2010.00348
Abstract:
Churn is one of the main problems restricting the development and deployment of Distributed Hash Table networks. In terms of churn treatment, this paper researches the quick start-up bootstrapping mechanism of Kademlia and proposes a heuristic bootst...
Churn is one of the main problems restricting the development and deployment of Distributed Hash Table networks. In terms of churn treatment, this paper researches the quick start-up bootstrapping mechanism of Kademlia and proposes a heuristic bootst...
2011, 33(2): 272-277.
doi: 10.3724/SP.J.1146.2010.00162
Abstract:
Hashing is popularly adopted when it comes to a large scale of IP flows. High throughout is available with minimized average memory access number. This paper mainly focused on the lookup performance of CAM (Content Addressable Memory) Aided Hash Tabl...
Hashing is popularly adopted when it comes to a large scale of IP flows. High throughout is available with minimized average memory access number. This paper mainly focused on the lookup performance of CAM (Content Addressable Memory) Aided Hash Tabl...
2011, 33(2): 278-283.
doi: 10.3724/SP.J.1146.2010.00375
Abstract:
Text information hiding detecting algorithm aims at distinguishing between normal text and sgeto-text. How to perform securely collaborative text information detection remains unsettled. For this reason, a privacy- preserving text information hiding ...
Text information hiding detecting algorithm aims at distinguishing between normal text and sgeto-text. How to perform securely collaborative text information detection remains unsettled. For this reason, a privacy- preserving text information hiding ...
2011, 33(2): 284-288.
doi: 10.3724/SP.J.1146.2010.00470
Abstract:
Extend algebraic immunity of Boolean functions are investigated in this paper. Firstly, a sufficient and necessary condition is presented that algebraic immunity of a Boolean function equals to its extended algebraic immunity. Secondly, it is proved ...
Extend algebraic immunity of Boolean functions are investigated in this paper. Firstly, a sufficient and necessary condition is presented that algebraic immunity of a Boolean function equals to its extended algebraic immunity. Secondly, it is proved ...
2011, 33(2): 289-294.
doi: 10.3724/SP.J.1146.2010.00301
Abstract:
The distortion metrics Sum of Square Error (SSE) and Sum of Absolute Difference (SAD), adopted in RDO on H.264 reference software, have been proved not correlating well with Human Visual System (HVS). Referring to JM16.2, this paper proposes to Combi...
The distortion metrics Sum of Square Error (SSE) and Sum of Absolute Difference (SAD), adopted in RDO on H.264 reference software, have been proved not correlating well with Human Visual System (HVS). Referring to JM16.2, this paper proposes to Combi...
2011, 33(2): 295-299.
doi: 10.3724/SP.J.1146.2010.00320
Abstract:
Precise ranging is the core technology of autonomous navigation. For code measurements yield noisy but unambiguous pseudorange estimates and the pseudorange obtained with carrier phase measurements are almost noiseless but are affected by integer amb...
Precise ranging is the core technology of autonomous navigation. For code measurements yield noisy but unambiguous pseudorange estimates and the pseudorange obtained with carrier phase measurements are almost noiseless but are affected by integer amb...
2011, 33(2): 300-303.
doi: 10.3724/SP.J.1146.2010.00346
Abstract:
This paper analyzes the performance of fine time synchronization which using cross correlation method and gives the relationship between its performance and the parameters of carrier frequency offset and signal to noise ratio. Then this paper proposa...
This paper analyzes the performance of fine time synchronization which using cross correlation method and gives the relationship between its performance and the parameters of carrier frequency offset and signal to noise ratio. Then this paper proposa...
2011, 33(2): 304-308.
doi: 10.3724/SP.J.1146.2010.00028
Abstract:
The issue of insufficient efficiency and accuracy of current estimation methods for characteristic polynomial of m sequence under high error conditions is studied. A equivalent relationship between m sequence and BCH codes is derived by studying thei...
The issue of insufficient efficiency and accuracy of current estimation methods for characteristic polynomial of m sequence under high error conditions is studied. A equivalent relationship between m sequence and BCH codes is derived by studying thei...
2011, 33(2): 309-314.
doi: 10.3724/SP.J.1146.2010.00257
Abstract:
To reduce decoding computational complexity of nonbinary Low-Density Parity-Check (LDPC) codes, a weighted symbol-flipping decoding algorithm based on a new criterion is proposed. The flipped symbol is determined according to the symbol flipping func...
To reduce decoding computational complexity of nonbinary Low-Density Parity-Check (LDPC) codes, a weighted symbol-flipping decoding algorithm based on a new criterion is proposed. The flipped symbol is determined according to the symbol flipping func...
2011, 33(2): 315-320.
doi: 10.3724/SP.J.1146.2010.00921
Abstract:
A novel algorithm based on Complex Discrete Hopfield Neural Network (CDHNN) is proposed to detect blindly multi-valued QAM signals in this paper. A multi-valued discrete activation function is constructed in both of the real part and imaginary part o...
A novel algorithm based on Complex Discrete Hopfield Neural Network (CDHNN) is proposed to detect blindly multi-valued QAM signals in this paper. A multi-valued discrete activation function is constructed in both of the real part and imaginary part o...
2011, 33(2): 321-325.
doi: 10.3724/SP.J.1146.2010.00418
Abstract:
For the problem of the source number and Direction Of Arrivals (DOAs) estimation of the weak signals in the presence of the strong signals, a new method based on eigen beamforming for estimating source number and DOAs is proposed. Firstly, the eigenv...
For the problem of the source number and Direction Of Arrivals (DOAs) estimation of the weak signals in the presence of the strong signals, a new method based on eigen beamforming for estimating source number and DOAs is proposed. Firstly, the eigenv...
2011, 33(2): 326-331.
doi: 10.3724/SP.J.1146.2010.00305
Abstract:
The appearance of Compressed Sensing (CS) has been paid a great deal of attention over the world in the recent years. A basic requirement of CS is that a signal should be sparse or it can be sparsely represented in some orthogonal bases. Based on the...
The appearance of Compressed Sensing (CS) has been paid a great deal of attention over the world in the recent years. A basic requirement of CS is that a signal should be sparse or it can be sparsely represented in some orthogonal bases. Based on the...
2011, 33(2): 332-336.
doi: 10.3724/SP.J.1146.2010.00472
Abstract:
A blind modulation recognition algorithm for MQAM signals is proposed. The method firstly estimates the signal carrier frequency and bandwidth from its spectrum to complete the frequency conversion and the low-pass filtering. Then the baud rate is es...
A blind modulation recognition algorithm for MQAM signals is proposed. The method firstly estimates the signal carrier frequency and bandwidth from its spectrum to complete the frequency conversion and the low-pass filtering. Then the baud rate is es...
2011, 33(2): 337-341.
doi: 10.3724/SP.J.1146.2010.00212
Abstract:
The NMF (Non-negative Matrix Factorization)-based image hashing is robust to common image operations (such as lossy compression, low-pass filtering, resolution scaling and etc.), but is sensitive to rotation operations. After carefully investigating ...
The NMF (Non-negative Matrix Factorization)-based image hashing is robust to common image operations (such as lossy compression, low-pass filtering, resolution scaling and etc.), but is sensitive to rotation operations. After carefully investigating ...
2011, 33(2): 342-346.
doi: 10.3724/SP.J.1146.2010.00335
Abstract:
An accelerated Landweber iterative thresholding algorithm in wavelet domain is proposed by using quadratic approximation of the fidelity term. In this algprithm, each iterate depends on a linear combination of the previous two iterates. Comparing wit...
An accelerated Landweber iterative thresholding algorithm in wavelet domain is proposed by using quadratic approximation of the fidelity term. In this algprithm, each iterate depends on a linear combination of the previous two iterates. Comparing wit...
Spatial Semantic Objects-based Hybrid Learning Method for Automatic Complicated Scene Classification
2011, 33(2): 347-354.
doi: 10.3724/SP.J.1146.2010.00361
Abstract:
Scene image classification refers to the task of grouping different images into semantic categories. A new spatial semantic objects-based hybrid learning method is proposed to overcome the disadvantages existing in most of the relative methods. This ...
Scene image classification refers to the task of grouping different images into semantic categories. A new spatial semantic objects-based hybrid learning method is proposed to overcome the disadvantages existing in most of the relative methods. This ...
2011, 33(2): 355-362.
doi: 10.3724/SP.J.1146.2010.00171
Abstract:
This paper focuses on the generation of wide-swath and high azimuth resolution image with the constellation of micro satellites in the condition of considering the effects of satellite ellipse orbit and earth rotation. The method of coordinate equiva...
This paper focuses on the generation of wide-swath and high azimuth resolution image with the constellation of micro satellites in the condition of considering the effects of satellite ellipse orbit and earth rotation. The method of coordinate equiva...
2011, 33(2): 363-368.
doi: 10.3724/SP.J.1146.2010.00342
Abstract:
A novel image diffusion equations and Markov Random Field (MRF)-based segmentation method for SAR images is proposed. The method involves the image diffusion based on the traditional MRF method. It is used to smooth the noise components in the SAR im...
A novel image diffusion equations and Markov Random Field (MRF)-based segmentation method for SAR images is proposed. The method involves the image diffusion based on the traditional MRF method. It is used to smooth the noise components in the SAR im...
2011, 33(2): 369-374.
doi: 10.3724/SP.J.1146.2010.00440
Abstract:
A two-dimensional phase unwrapping algorithm is proposed for InSAR based on quality-guided and minimum discontinuity. The wrapped phase is partitioned into high and low quality areas according to its quality map, and the quality-guided algorithm is u...
A two-dimensional phase unwrapping algorithm is proposed for InSAR based on quality-guided and minimum discontinuity. The wrapped phase is partitioned into high and low quality areas according to its quality map, and the quality-guided algorithm is u...
2011, 33(2): 375-380.
doi: 10.3724/SP.J.1146.2010.00430
Abstract:
Because of small size, lightweight, inexpensive and high-resolution, recently FMCW-SAR develops rapidly and has a great prospect in the cost-effective civil applications. The system transfer function of StripMap FMCW-SAR is different from that of pul...
Because of small size, lightweight, inexpensive and high-resolution, recently FMCW-SAR develops rapidly and has a great prospect in the cost-effective civil applications. The system transfer function of StripMap FMCW-SAR is different from that of pul...
2011, 33(2): 381-387.
doi: 10.3724/SP.J.1146.2010.00185
Abstract:
PS (Permanent Scatters) selection methods mostly used points statistic characteristics as criteria, which of course ignores temporal information of the data sets, some good permanent scatterers may also be ignored. This paper is focused on quasi perm...
PS (Permanent Scatters) selection methods mostly used points statistic characteristics as criteria, which of course ignores temporal information of the data sets, some good permanent scatterers may also be ignored. This paper is focused on quasi perm...
2011, 33(2): 388-394.
doi: 10.3724/SP.J.1146.2010.00236
Abstract:
Chaotic FM signal has ideal auto-correlation performance and good Electronic Counter-Counter Measure (ECCM) capabilities like random signals. In this paper, a type of chaotic FM signal generated by Bernoulli map is used for ultra-wideband through-the...
Chaotic FM signal has ideal auto-correlation performance and good Electronic Counter-Counter Measure (ECCM) capabilities like random signals. In this paper, a type of chaotic FM signal generated by Bernoulli map is used for ultra-wideband through-the...
2011, 33(2): 395-400.
doi: 10.3724/SP.J.1146.2010.00023
Abstract:
A new polarimetric SAR image CFAR target detection method is proposed in this paper. Firstly, the statistical distribution of PMF (Polarimetric Matched Filter) metric is deduced (signified as P-G0 distribution) based on product model combining the in...
A new polarimetric SAR image CFAR target detection method is proposed in this paper. Firstly, the statistical distribution of PMF (Polarimetric Matched Filter) metric is deduced (signified as P-G0 distribution) based on product model combining the in...
2011, 33(2): 401-406.
doi: 10.3724/SP.J.1146.2009.01409
Abstract:
Multiple aperture sub-band synthetic technique can be realized for Multiple-input and Multiple-output SAR at the state-of-the-art level. The frequency sub-band synthetic technique is researched; The mathematical model is proposed. Combining mathemati...
Multiple aperture sub-band synthetic technique can be realized for Multiple-input and Multiple-output SAR at the state-of-the-art level. The frequency sub-band synthetic technique is researched; The mathematical model is proposed. Combining mathemati...
2011, 33(2): 407-411.
doi: 10.3724/SP.J.1146.2010.00414
Abstract:
Increasing integration time is the main approach to improve performance of digital TV based passive radar, but the range and Doppler migration caused by velocity and acceleration of the targets restrict the coherent integration time. This paper prese...
Increasing integration time is the main approach to improve performance of digital TV based passive radar, but the range and Doppler migration caused by velocity and acceleration of the targets restrict the coherent integration time. This paper prese...
2011, 33(2): 412-417.
doi: 10.3724/SP.J.1146.2010.00331
Abstract:
The polarimetric error will cause optimal interferometric phase estimation error. In this paper the polarimetric error transferring in the Polarimetric Interferometric SAR (PolInSAR) measurement is studied and a new polarimetric error transfer model ...
The polarimetric error will cause optimal interferometric phase estimation error. In this paper the polarimetric error transferring in the Polarimetric Interferometric SAR (PolInSAR) measurement is studied and a new polarimetric error transfer model ...
2011, 33(2): 418-423.
doi: 10.3724/SP.J.1146.2010.00380
Abstract:
A novel pseudo-random multi-phase code Continuous Wave (CW) radar using Compressive Sensing (CS) is presented considering the sparse of radar target space. This paper establishes targets information sensing model. Compressive sensing is employed to s...
A novel pseudo-random multi-phase code Continuous Wave (CW) radar using Compressive Sensing (CS) is presented considering the sparse of radar target space. This paper establishes targets information sensing model. Compressive sensing is employed to s...
2011, 33(2): 424-428.
doi: 10.3724/SP.J.1146.2010.00356
Abstract:
The sounding depth is one of the most important parameter of GPR (Ground Penetrating Radar), how to expand detectable range under a given resolution is a concern issue in the field of GPR all over the world. The application of Pseudo Random Binary Se...
The sounding depth is one of the most important parameter of GPR (Ground Penetrating Radar), how to expand detectable range under a given resolution is a concern issue in the field of GPR all over the world. The application of Pseudo Random Binary Se...
2011, 33(2): 429-434.
doi: 10.3724/SP.J.1146.2010.00328
Abstract:
An improved Shuffled Frog Leaping Algorithm (SFLA) is proposed to solve the Capacitated Vehicle Routing Problem(CVRP)based on real-coded patterns. It is then combined with the power-law Extremal Optimization (-EO) to further improve the local search ...
An improved Shuffled Frog Leaping Algorithm (SFLA) is proposed to solve the Capacitated Vehicle Routing Problem(CVRP)based on real-coded patterns. It is then combined with the power-law Extremal Optimization (-EO) to further improve the local search ...
2011, 33(2): 435-441.
doi: 10.3724/SP.J.1146.2010.00217
Abstract:
A new incremental knowledge acquisition method based on granular computing theory is proposed. First, an original knowledge granule tree is established according to the decision-making information system. Then, for any new additional data, its matche...
A new incremental knowledge acquisition method based on granular computing theory is proposed. First, an original knowledge granule tree is established according to the decision-making information system. Then, for any new additional data, its matche...
2011, 33(2): 442-447.
doi: 10.3724/SP.J.1146.2010.00166
Abstract:
Watermark robustness to geometric attacks is still a challenging issue. A blind watermarking scheme is proposed against geometric attacks to construct watermark synchronization information by using Directionlet: Firstly, the edge detection operator i...
Watermark robustness to geometric attacks is still a challenging issue. A blind watermarking scheme is proposed against geometric attacks to construct watermark synchronization information by using Directionlet: Firstly, the edge detection operator i...
2011, 33(2): 448-454.
doi: 10.3724/SP.J.1146.2010.00294
Abstract:
Nowadays, the research on the implementation of color-based particle filters is facing the problem of tracking accuracy and real-time processing speed. This paper presents a modified color-based particle filter, which basing on the traditional SR res...
Nowadays, the research on the implementation of color-based particle filters is facing the problem of tracking accuracy and real-time processing speed. This paper presents a modified color-based particle filter, which basing on the traditional SR res...
2011, 33(2): 455-460.
doi: 10.3724/SP.J.1146.2010.00249
Abstract:
Conductivity and dielectric attenuation in millimeter-wave TWT helical Slow-Wave Structure (SWS) are analyzed by a stratified dielectric helix tape and a 3D electromagnetic model. In tape model, the imaginary part of complex propagation constant is c...
Conductivity and dielectric attenuation in millimeter-wave TWT helical Slow-Wave Structure (SWS) are analyzed by a stratified dielectric helix tape and a 3D electromagnetic model. In tape model, the imaginary part of complex propagation constant is c...
2011, 33(2): 461-465.
doi: 10.3724/SP.J.1146.2010.00400
Abstract:
Based on Interleaving Extraction and Block Compressive Sensing (IEBCS), a new Multiple Description Coding method (IEBCS-MDC) which can be achieved real-timely during imaging process is presented. The method is first partitions an image into several s...
Based on Interleaving Extraction and Block Compressive Sensing (IEBCS), a new Multiple Description Coding method (IEBCS-MDC) which can be achieved real-timely during imaging process is presented. The method is first partitions an image into several s...
2011, 33(2): 466-469.
doi: 10.3724/SP.J.1146.2010.00349
Abstract:
An optimal algorithm based on adaptive wavelet de-noising is proposed to improve effectively the performance of digital modulation recognition under low Signal to Noise Ratio (SNR). An adaptive wavelet threshold de-noising filter is used to eliminate...
An optimal algorithm based on adaptive wavelet de-noising is proposed to improve effectively the performance of digital modulation recognition under low Signal to Noise Ratio (SNR). An adaptive wavelet threshold de-noising filter is used to eliminate...
2011, 33(2): 470-474.
doi: 10.3724/SP.J.1146.2010.00352
Abstract:
Considering that the code-aided and data-aided carrier recovery algorithms perform small synchronization range and big inaccuracy in low Signal to Noise Ratio (SNR) deep space communication systems, a joint assisted carrier synchronization algorithm ...
Considering that the code-aided and data-aided carrier recovery algorithms perform small synchronization range and big inaccuracy in low Signal to Noise Ratio (SNR) deep space communication systems, a joint assisted carrier synchronization algorithm ...
2011, 33(2): 475-478.
doi: 10.3724/SP.J.1146.2010.00314
Abstract:
To reduce the computational complexity of spectrum sensing and improve the spectrum sensing performance, a spectrum sensing method based on the fractal box dimension was proposed. As the box dimensions of noise and signal are different, the fractal b...
To reduce the computational complexity of spectrum sensing and improve the spectrum sensing performance, a spectrum sensing method based on the fractal box dimension was proposed. As the box dimensions of noise and signal are different, the fractal b...
2011, 33(2): 479-483.
doi: 10.3724/SP.J.1146.2010.00210
Abstract:
In this paper, a self-tune AQM (Active Queue Management) algorithm with acceleration factor is presented by analyzing Blue algorithm and its variants, which is called SABlue (Self-tune Accelerate Blue). In order to make the queue length kept in the a...
In this paper, a self-tune AQM (Active Queue Management) algorithm with acceleration factor is presented by analyzing Blue algorithm and its variants, which is called SABlue (Self-tune Accelerate Blue). In order to make the queue length kept in the a...
2011, 33(2): 484-488.
doi: 10.3724/SP.J.1146.2010.00435
Abstract:
This paper investigates on SAR system that is constituted from Single-Input Multiple-Output (SIMO) or Multiple-Input Multiple-Output (MIMO), and researches the working mode of transmitting one by one or transmitting in same time with multiple transmi...
This paper investigates on SAR system that is constituted from Single-Input Multiple-Output (SIMO) or Multiple-Input Multiple-Output (MIMO), and researches the working mode of transmitting one by one or transmitting in same time with multiple transmi...
2011, 33(2): 489-493.
doi: 10.3724/SP.J.1146.2010.00315
Abstract:
The typical pilot-aided and blind estimation method for MIMO-OFDM channel can achieve good performance when the number of multi-path components is constant. However, in the practical wireless environment, the number of channel taps and amplitude are ...
The typical pilot-aided and blind estimation method for MIMO-OFDM channel can achieve good performance when the number of multi-path components is constant. However, in the practical wireless environment, the number of channel taps and amplitude are ...
2011, 33(2): 494-498.
doi: 10.3724/SP.J.1146.2010.00309
Abstract:
Correntropy is a localized similarity measure between two scalar random variables. This paper presents the parametric representation of the symmetric-stable (SS) distributions correntropy. The equivalency of the maximum correntropy criterion and the ...
Correntropy is a localized similarity measure between two scalar random variables. This paper presents the parametric representation of the symmetric-stable (SS) distributions correntropy. The equivalency of the maximum correntropy criterion and the ...
2011, 33(2): 499-503.
doi: 10.3724/SP.J.1146.2010.00230
Abstract:
In this paper laser printer mechanism is researched, and intelligent print document identification and retrieval are achieved by measuring print shape deviation which reflects the intrinsic tolerances of printer device. A novel polar Hausdorff distan...
In this paper laser printer mechanism is researched, and intelligent print document identification and retrieval are achieved by measuring print shape deviation which reflects the intrinsic tolerances of printer device. A novel polar Hausdorff distan...
2011, 33(2): 504-508.
doi: 10.3724/SP.J.1146.2010.00502
Abstract:
As an important module of aircraft navigation and correspondence systems, the remote distance communication depends mainly on the airborne High Frequency (HF) antenna. With the use of new materials and larger size of aircraft, HF antennas tend to be ...
As an important module of aircraft navigation and correspondence systems, the remote distance communication depends mainly on the airborne High Frequency (HF) antenna. With the use of new materials and larger size of aircraft, HF antennas tend to be ...
