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2013 Vol. 35, No. 5
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2013, 35(5): 1017-1022.
doi: 10.3724/SP.J.1146.2012.01219
Abstract:
There exist two problems with the conventional Maximal Likelihood (ML) decoding algorithms: high decoding complexity and large memory space consumption. To solve these problems, a new algorithm that is based on Viterbi and bidirectional searching alg...
There exist two problems with the conventional Maximal Likelihood (ML) decoding algorithms: high decoding complexity and large memory space consumption. To solve these problems, a new algorithm that is based on Viterbi and bidirectional searching alg...
2013, 35(5): 1023-1030.
doi: 10.3724/SP.J.1146.2012.01180
Abstract:
The existing resource allocation research for OFDMA relay networks investigate only frequency-domain allocation and power allocation with fixed time-domain allocation, which can not fit the user service changes in time-domain. An optimal energy-effic...
The existing resource allocation research for OFDMA relay networks investigate only frequency-domain allocation and power allocation with fixed time-domain allocation, which can not fit the user service changes in time-domain. An optimal energy-effic...
2013, 35(5): 1031-1036.
doi: 10.3724/SP.J.1146.2012.01120
Abstract:
This paper considers MIMO cellular downlink model with 3 cells and 2 edge users in each cell. By mean of orthogonal-triangular decomposes of the joint channel matrix, the equivalent system model is derived, which has the same degrees of freedom with ...
This paper considers MIMO cellular downlink model with 3 cells and 2 edge users in each cell. By mean of orthogonal-triangular decomposes of the joint channel matrix, the equivalent system model is derived, which has the same degrees of freedom with ...
2013, 35(5): 1037-1043.
doi: 10.3724/SP.J.1146.2012.01727
Abstract:
In order to solve over-segmentation issue and improve computing efficiency, this paper proposes a moving object segmentation model using binary level set based on shape constraint and local curve evolution. Firstly, the model introduces priori shape ...
In order to solve over-segmentation issue and improve computing efficiency, this paper proposes a moving object segmentation model using binary level set based on shape constraint and local curve evolution. Firstly, the model introduces priori shape ...
2013, 35(5): 1044-1048.
doi: 10.3724/SP.J.1146.2012.01257
Abstract:
Let R denote the ring R=Fq+uFq++uk1Fq , and be an invertible element of R. By means of the theory of ring homomorphism, the generators of all these (u1)-constacyclic codes of an arbitrary length N over the ring R are obtained. It is proved thatR[x]xN...
Let R denote the ring R=Fq+uFq++uk1Fq , and be an invertible element of R. By means of the theory of ring homomorphism, the generators of all these (u1)-constacyclic codes of an arbitrary length N over the ring R are obtained. It is proved thatR[x]xN...
2013, 35(5): 1049-1054.
doi: 10.3724/SP.J.1146.2012.01080
Abstract:
The design of shift sequences is the key issue of the Zero Correlation Zone (ZCZ) construction based on interleaving technique. The restriction condition is analyzed according to the correlation function and accordingly a method of ZCZ sequence set c...
The design of shift sequences is the key issue of the Zero Correlation Zone (ZCZ) construction based on interleaving technique. The restriction condition is analyzed according to the correlation function and accordingly a method of ZCZ sequence set c...
2013, 35(5): 1055-1062.
doi: 10.3724/SP.J.1146.2012.00415
Abstract:
According to the mapping relationship between the multiple secret images pixel combinations and the basis matrices, the redundant basis matrices are analyzed in the access-based multi-secret visual cryptography. A compression algorithm is proposed to...
According to the mapping relationship between the multiple secret images pixel combinations and the basis matrices, the redundant basis matrices are analyzed in the access-based multi-secret visual cryptography. A compression algorithm is proposed to...
2013, 35(5): 1063-1068.
doi: 10.3724/SP.J.1146.2012.01213
Abstract:
This paper firstly gives the formalization description of both players strategies and payoffs in the mimicry honeypot game, and constructs the payoff matrix of the fraudulent game using non-cooperative and incomplete dynamic game theory. Then the equ...
This paper firstly gives the formalization description of both players strategies and payoffs in the mimicry honeypot game, and constructs the payoff matrix of the fraudulent game using non-cooperative and incomplete dynamic game theory. Then the equ...
2013, 35(5): 1069-1075.
doi: 10.3724/SP.J.1146.2012.01053
Abstract:
The expired-time packet loss rate is a common parameter to measure the quality of service of transmission of deadline-constrained traffic in wireless networks. However, this parameter can not reflect the influence on the quality of service of video c...
The expired-time packet loss rate is a common parameter to measure the quality of service of transmission of deadline-constrained traffic in wireless networks. However, this parameter can not reflect the influence on the quality of service of video c...
2013, 35(5): 1076-1082.
doi: 10.3724/SP.J.1146.2012.01048
Abstract:
Considering the control channel bottleneck issue and hidden terminal issue for multi-channel MAC in Ad-hoc networks, a new multi-channel MAC with the Low Control Overhead (LCO-MAC) is proposed. Different from the multi-channel MAC mechanism based on ...
Considering the control channel bottleneck issue and hidden terminal issue for multi-channel MAC in Ad-hoc networks, a new multi-channel MAC with the Low Control Overhead (LCO-MAC) is proposed. Different from the multi-channel MAC mechanism based on ...
2013, 35(5): 1083-1089.
doi: 10.3724/SP.J.1146.2012.00344
Abstract:
With the increasing number of new protocols and the rapid growth of the network link rate, the packet parsing architecture has been greatly challenged on its flexibility and rate. While combining the idea of pipeline design and binary-trie, a new par...
With the increasing number of new protocols and the rapid growth of the network link rate, the packet parsing architecture has been greatly challenged on its flexibility and rate. While combining the idea of pipeline design and binary-trie, a new par...
2013, 35(5): 1090-1096.
doi: 10.3724/SP.J.1146.2012.01207
Abstract:
The ordinary SAR imaging algorithms are inapplicable to missile-borne terminal guidance SAR due to its properties of high-speed, dive and high-squint. Based on the precise SAR echo signal in dive model, this paper proposes a new imaging algorithm of ...
The ordinary SAR imaging algorithms are inapplicable to missile-borne terminal guidance SAR due to its properties of high-speed, dive and high-squint. Based on the precise SAR echo signal in dive model, this paper proposes a new imaging algorithm of ...
2013, 35(5): 1097-1102.
doi: 10.3724/SP.J.1146.2012.01136
Abstract:
The raw data of Synthetic Aperture Radar (SAR) is complex value, as well as the image data. Due to the random phase of each scattering cell, continuous scene has a wide signal band which makes single-aperture SAR difficult to realize down-sampling. I...
The raw data of Synthetic Aperture Radar (SAR) is complex value, as well as the image data. Due to the random phase of each scattering cell, continuous scene has a wide signal band which makes single-aperture SAR difficult to realize down-sampling. I...
2013, 35(5): 1103-1107.
doi: 10.3724/SP.J.1146.2012.01122
Abstract:
Shadow Inverse Synthetic Aperture Radar (SISAR) imaging algorithm is a kind of technology to extract the profile of a target from the forward scattering signal. The imaging accuracy depends on the target coordinate estimation precision. In this paper...
Shadow Inverse Synthetic Aperture Radar (SISAR) imaging algorithm is a kind of technology to extract the profile of a target from the forward scattering signal. The imaging accuracy depends on the target coordinate estimation precision. In this paper...
2013, 35(5): 1108-1113.
doi: 10.3724/SP.J.1146.2012.01148
Abstract:
A novel passive radar imaging time-domain algorithm is presented based on single-frequency continuous wave. The signal matched matrix is builded firstly, and the echo signal is expanded into a echo signal matrix. Finally the sum in time dimension of ...
A novel passive radar imaging time-domain algorithm is presented based on single-frequency continuous wave. The signal matched matrix is builded firstly, and the echo signal is expanded into a echo signal matrix. Finally the sum in time dimension of ...
2013, 35(5): 1114-1119.
doi: 10.3724/SP.J.1146.2012.01056
Abstract:
Through-wall-radar imaging is performed to image the architectural layout imaging and hidden target of building. Wall images formed through the architectural layout imaging are considered as the reference to define the relative position of the hidden...
Through-wall-radar imaging is performed to image the architectural layout imaging and hidden target of building. Wall images formed through the architectural layout imaging are considered as the reference to define the relative position of the hidden...
2013, 35(5): 1120-1127.
doi: 10.3724/SP.J.1146.2012.01198
Abstract:
A SAR image detection method is proposed based on local hybrid filter. This method combines the advantages of both local hybrid filter based NonSubsampled Direction Filter Bank-Dual-Tree Complex Wavelet Transform (NSDFB-DTCWT) and Dempster-Shafet (DS...
A SAR image detection method is proposed based on local hybrid filter. This method combines the advantages of both local hybrid filter based NonSubsampled Direction Filter Bank-Dual-Tree Complex Wavelet Transform (NSDFB-DTCWT) and Dempster-Shafet (DS...
2013, 35(5): 1128-1134.
doi: 10.3724/SP.J.1146.2012.01663
Abstract:
In the Inverse Synthetic Aperture Radar (ISAR) imaging of targets with rotating parts, the Doppler centroid of the radar returns are disturbed by the micro-Doppler of the rotating parts. As a result, the phase estimation and compensation accuracy wil...
In the Inverse Synthetic Aperture Radar (ISAR) imaging of targets with rotating parts, the Doppler centroid of the radar returns are disturbed by the micro-Doppler of the rotating parts. As a result, the phase estimation and compensation accuracy wil...
2013, 35(5): 1135-1141.
doi: 10.3724/SP.J.1146.2012.01157
Abstract:
Doppler rate estimation is an essential procedure in Synthetic Aperture Radar (SAR) signal processing. For the Doppler rate estimation in spotlight and sliding spotlight SAR focused with the full-aperture imaging algorithm, this paper proposes an imp...
Doppler rate estimation is an essential procedure in Synthetic Aperture Radar (SAR) signal processing. For the Doppler rate estimation in spotlight and sliding spotlight SAR focused with the full-aperture imaging algorithm, this paper proposes an imp...
2013, 35(5): 1142-1148.
doi: 10.3724/SP.J.1146.2012.01070
Abstract:
To solve the problem of target localization with sparse array in bistatic MIMO radar, a projection and Singular Value Decomposition (SVD) based Regularized Multi-vectors FOCal Undetermined System Solver (RMFOCUSS) algorithm is proposed. First the tar...
To solve the problem of target localization with sparse array in bistatic MIMO radar, a projection and Singular Value Decomposition (SVD) based Regularized Multi-vectors FOCal Undetermined System Solver (RMFOCUSS) algorithm is proposed. First the tar...
2013, 35(5): 1149-1155.
doi: 10.3724/SP.J.1146.2012.01167
Abstract:
This paper presents an angle estimation method for multitargets in bistatic MIMO radar system. It can estimate DOD and DOA with single snapshot in time domain. By exploiting transmisson diversity smoothing to the equivalent receiving array data, the ...
This paper presents an angle estimation method for multitargets in bistatic MIMO radar system. It can estimate DOD and DOA with single snapshot in time domain. By exploiting transmisson diversity smoothing to the equivalent receiving array data, the ...
2013, 35(5): 1156-1162.
doi: 10.3724/SP.J.1146.2012.01134
Abstract:
Considering the issue of low computation efficiency of Ground Penetrating Radar (GPR) object detection method, a fast algorithm is proposed based on the spatial distribution of reflected energy, which is modeled as a three-parameter hyperbola. A refl...
Considering the issue of low computation efficiency of Ground Penetrating Radar (GPR) object detection method, a fast algorithm is proposed based on the spatial distribution of reflected energy, which is modeled as a three-parameter hyperbola. A refl...
2013, 35(5): 1163-1169.
doi: 10.3724/SP.J.1146.2012.01249
Abstract:
The fourth generation fighters have the feature of stealth, supersonic and maneuvering, and detection performance of the fighters with traditional radar is bad. Considering the metric-band phased array radar, and using its feature of anti-stealth and...
The fourth generation fighters have the feature of stealth, supersonic and maneuvering, and detection performance of the fighters with traditional radar is bad. Considering the metric-band phased array radar, and using its feature of anti-stealth and...
2013, 35(5): 1170-1176.
doi: 10.3724/SP.J.1146.2012.01069
Abstract:
Combining with Edge Strength Map (ESM), an unsupervised estimation of the Equivalent Number of Looks (ENL) in SAR images is proposed. First, ESM is produced by ratio operation of anisotropic Gaussian kernel parallel windows. On the basis of simple im...
Combining with Edge Strength Map (ESM), an unsupervised estimation of the Equivalent Number of Looks (ENL) in SAR images is proposed. First, ESM is produced by ratio operation of anisotropic Gaussian kernel parallel windows. On the basis of simple im...
2013, 35(5): 1177-1184.
doi: 10.3724/SP.J.1146.2012.01082
Abstract:
In order to reduce the computation complexity resulted from large number of spectral information and to reduce the decline of classification performance resulted from data redundancy, a dimensionality reduction algorithm called non-negative sparse gr...
In order to reduce the computation complexity resulted from large number of spectral information and to reduce the decline of classification performance resulted from data redundancy, a dimensionality reduction algorithm called non-negative sparse gr...
2013, 35(5): 1185-1189.
doi: 10.3724/SP.J.1146.2012.01096
Abstract:
To solve the problem that the Synthetic Aperture Sonar (SAS) motion errors distinct variety in large slant range may reduce the imaging resolution, this paper proposes an improved motion error fitting and compensation method based on segment Displace...
To solve the problem that the Synthetic Aperture Sonar (SAS) motion errors distinct variety in large slant range may reduce the imaging resolution, this paper proposes an improved motion error fitting and compensation method based on segment Displace...
2013, 35(5): 1190-1195.
doi: 10.3724/SP.J.1146.2012.01459
Abstract:
This paper presents a novel multiscale variational image decomposition model. Based on the hierarchical multiscale variational model of Tadmor, a novel (BV, H-1) hierarchical multiscale image decomposition method is proposed, then the novel Integro-D...
This paper presents a novel multiscale variational image decomposition model. Based on the hierarchical multiscale variational model of Tadmor, a novel (BV, H-1) hierarchical multiscale image decomposition method is proposed, then the novel Integro-D...
2013, 35(5): 1196-1201.
doi: 10.3724/SP.J.1146.2012.01429
Abstract:
Sparsity-based Direction-Of-Arrival (DOA) estimation via l1-norm optimization requires fine tuning of the regularization parameter and large computational times. To alleviate these problems, this paper presents an efficient approach based on Sparse B...
Sparsity-based Direction-Of-Arrival (DOA) estimation via l1-norm optimization requires fine tuning of the regularization parameter and large computational times. To alleviate these problems, this paper presents an efficient approach based on Sparse B...
2013, 35(5): 1202-1207.
doi: 10.3724/SP.J.1146.2012.01138
Abstract:
Based on alternative iteration, an algorithm is proposed to estimate the DoAs of mixed signals and mutual coupling error for Uniform Linear Array (ULA). In the algorithm, utilizing the Toeplitz structure of the mutual coupling matrix of the ULA, a th...
Based on alternative iteration, an algorithm is proposed to estimate the DoAs of mixed signals and mutual coupling error for Uniform Linear Array (ULA). In the algorithm, utilizing the Toeplitz structure of the mutual coupling matrix of the ULA, a th...
2013, 35(5): 1208-1214.
doi: 10.3724/SP.J.1146.2012.00960
Abstract:
Current 1D signal trend extracting methods have such disadvantages as low efficiency, poor flexibility and so on. To overcome these problems, a new method of 1D signal fast trend extracting based on multi-scale extrema is proposed. By making full use...
Current 1D signal trend extracting methods have such disadvantages as low efficiency, poor flexibility and so on. To overcome these problems, a new method of 1D signal fast trend extracting based on multi-scale extrema is proposed. By making full use...
2013, 35(5): 1215-1221.
doi: 10.3724/SP.J.1146.2012.01132
Abstract:
The Scale Invariant Feature Transform (SIFT) has a fine algorithm performance and an extensive application to the matching algorithm of local features, but its descriptor is characterized by a high dimension and huge time consumption also gives rise ...
The Scale Invariant Feature Transform (SIFT) has a fine algorithm performance and an extensive application to the matching algorithm of local features, but its descriptor is characterized by a high dimension and huge time consumption also gives rise ...
2013, 35(5): 1222-1228.
doi: 10.3724/SP.J.1146.2012.01142
Abstract:
A novel non-rigid image registration algorithm is proposed based on an improved version of the traditional variational optical flow model and the extraction of the Scale-Invariant Feature Transform (SIFT) feature points. In this model, the issue of p...
A novel non-rigid image registration algorithm is proposed based on an improved version of the traditional variational optical flow model and the extraction of the Scale-Invariant Feature Transform (SIFT) feature points. In this model, the issue of p...
2013, 35(5): 1229-1235.
doi: 10.3724/SP.J.1146.2012.01205
Abstract:
According to H.264/AVC specific codec architecture, a novel watermarking algorithm with symbol encoding is proposed. Based on the analysis of requantization transcoding, the macroblock used for watermarking is selected with the combination of texture...
According to H.264/AVC specific codec architecture, a novel watermarking algorithm with symbol encoding is proposed. Based on the analysis of requantization transcoding, the macroblock used for watermarking is selected with the combination of texture...
2013, 35(5): 1236-1240.
doi: 10.3724/SP.J.1146.2012.01059
Abstract:
A method of calculating focal field is introduced, and the connection between focal field, which depends on the reflector geometry, and the aperture field of feed is analyzed. Based on focal field distribution, a design method of phased array feed, i...
A method of calculating focal field is introduced, and the connection between focal field, which depends on the reflector geometry, and the aperture field of feed is analyzed. Based on focal field distribution, a design method of phased array feed, i...
2013, 35(5): 1241-1246.
doi: 10.3724/SP.J.1146.2012.01256
Abstract:
This paper presents a new type of coaxial cavity loaded with a ridged cavity and a filter as the output circuit of S-band multiple-beam klystron. Theoretic analysis and equivalent circuit of the output circuit are given based on the theory of couplin...
This paper presents a new type of coaxial cavity loaded with a ridged cavity and a filter as the output circuit of S-band multiple-beam klystron. Theoretic analysis and equivalent circuit of the output circuit are given based on the theory of couplin...
2013, 35(5): 1247-1251.
doi: 10.3724/SP.J.1146.2012.01289
Abstract:
According to the characteristics of space target image, an novel method of space target image categorization based on local invariant features is proposed. The method extracts firstly local invariant features of each image and uses Gaussian Mixture M...
According to the characteristics of space target image, an novel method of space target image categorization based on local invariant features is proposed. The method extracts firstly local invariant features of each image and uses Gaussian Mixture M...
2013, 35(5): 1252-1256.
doi: 10.3724/SP.J.1146.2012.01075
Abstract:
A parameters estimation algorithm based on the power spectral FFT is proposed to estimate the parameters of Binary Phase Shift Keying (BPSK) signals under negative Signal-to-Noise Ratio (SNR) environment. The code width, carrier frequency and code le...
A parameters estimation algorithm based on the power spectral FFT is proposed to estimate the parameters of Binary Phase Shift Keying (BPSK) signals under negative Signal-to-Noise Ratio (SNR) environment. The code width, carrier frequency and code le...
2013, 35(5): 1257-1261.
doi: 10.3724/SP.J.1146.2012.01174
Abstract:
Resource allocation plays a significant role in current wireless communications. In order to improve the performance of the whole wireless network and social welfare, the limited network resources should be allocated efficiently and fairly. In this p...
Resource allocation plays a significant role in current wireless communications. In order to improve the performance of the whole wireless network and social welfare, the limited network resources should be allocated efficiently and fairly. In this p...
2013, 35(5): 1262-1266.
doi: 10.3724/SP.J.1146.2012.01169
Abstract:
With the development of semiconductor technologies and integration of chips, soft errors become the key factor influencing circuit reliability. In order to estimate the effects of soft errors, a reliability calculation method of gate-level circuit ba...
With the development of semiconductor technologies and integration of chips, soft errors become the key factor influencing circuit reliability. In order to estimate the effects of soft errors, a reliability calculation method of gate-level circuit ba...
2013, 35(5): 1267-1270.
doi: 10.3724/SP.J.1146.2012.01269
Abstract:
Single gap close coaxial resonator cavity with high order TM310 mode is designed. A new structure of output rectangular waveguide with the transverse inductance filter diaphragms is also designed. The average gap impedance variation with the frequenc...
Single gap close coaxial resonator cavity with high order TM310 mode is designed. A new structure of output rectangular waveguide with the transverse inductance filter diaphragms is also designed. The average gap impedance variation with the frequenc...
