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2012 Vol. 34, No. 9
Display Method:
2012, 34(9): 2033-2038.
doi: 10.3724/SP.J.1146.2012.00021
Abstract:
To increase signal number distinguished by traditional MUSIC algorithm, this paper proposes a MUSIC algorithm based on three-dimensional smoothing by a coprime pair of two-dimensional sparse electromagnetic vector arrays. The coprime relationship bet...
To increase signal number distinguished by traditional MUSIC algorithm, this paper proposes a MUSIC algorithm based on three-dimensional smoothing by a coprime pair of two-dimensional sparse electromagnetic vector arrays. The coprime relationship bet...
2012, 34(9): 2039-2044.
doi: 10.3724/SP.J.1146.2012.00150
Abstract:
To solve the problems of traditional methods for mixing matrix estimation in blind source separation such as poor robustness, the defect that separation performance is vulnerable to the initial value and low estimation accuracy, Artificial Bee Colony...
To solve the problems of traditional methods for mixing matrix estimation in blind source separation such as poor robustness, the defect that separation performance is vulnerable to the initial value and low estimation accuracy, Artificial Bee Colony...
2012, 34(9): 2045-2050.
doi: 10.3724/SP.J.1146.2012.00118
Abstract:
A nonlinear adaptive beamforming approach based on Least-Square Support Vector Regression (LS-SVR) is proposed to enhance the beamformers robustness against array model mismatch, constrained samples numerous interferences, etc. The approach has two h...
A nonlinear adaptive beamforming approach based on Least-Square Support Vector Regression (LS-SVR) is proposed to enhance the beamformers robustness against array model mismatch, constrained samples numerous interferences, etc. The approach has two h...
2012, 34(9): 2051-2057.
doi: 10.3724/SP.J.1146.2012.00146
Abstract:
To overcome effectively the influence of large steering vector mismatch on the performance of adaptive beamformer, a Robust Adaptive Beamformer using Decomposition and Iterative Second-Order Cone Programming via Worst-Case performance optimization (R...
To overcome effectively the influence of large steering vector mismatch on the performance of adaptive beamformer, a Robust Adaptive Beamformer using Decomposition and Iterative Second-Order Cone Programming via Worst-Case performance optimization (R...
2012, 34(9): 2058-2063.
doi: 10.3724/SP.J.1146.2012.00203
Abstract:
In order to make the color edge detector considering the discrimination of human eyes, avoiding the perceptually insigni?cant edges being over-detected, a novel color gradient based color-edge detection algorithm based on the adaptive perceptual colo...
In order to make the color edge detector considering the discrimination of human eyes, avoiding the perceptually insigni?cant edges being over-detected, a novel color gradient based color-edge detection algorithm based on the adaptive perceptual colo...
2012, 34(9): 2064-2070.
doi: 10.3724/SP.J.1146.2012.00047
Abstract:
The Bag of Words (BoW) model is applied to object classification in this paper. An optimized method based on the combination of Region Of Interest (ROI) extraction and pyramid matching scheme is proposed to optimize and improve the traditional model ...
The Bag of Words (BoW) model is applied to object classification in this paper. An optimized method based on the combination of Region Of Interest (ROI) extraction and pyramid matching scheme is proposed to optimize and improve the traditional model ...
2012, 34(9): 2071-2077.
doi: 10.3724/SP.J.1146.2012.00088
Abstract:
A novel method of?locating and quantifying the color errors introduced by subpixel addressing technology in color matrix displays is proposed. According to the spatial color blending of human visions, the paper indicates that the measurement of color...
A novel method of?locating and quantifying the color errors introduced by subpixel addressing technology in color matrix displays is proposed. According to the spatial color blending of human visions, the paper indicates that the measurement of color...
2012, 34(9): 2078-2084.
doi: 10.3724/SP.J.1146.2012.00005
Abstract:
In the application of image segmentation based on fast level set algorithm, there exist difficulties in level set initialization and setting thresholds, so a new algorithm which combining PYRamid model, Random Walk and Level Set (PYR-RW-LS) is propos...
In the application of image segmentation based on fast level set algorithm, there exist difficulties in level set initialization and setting thresholds, so a new algorithm which combining PYRamid model, Random Walk and Level Set (PYR-RW-LS) is propos...
2012, 34(9): 2085-2090.
doi: 10.3724/SP.J.1146.2012.00125
Abstract:
This paper put forth a technique called Error-Detecting Network of Pronunciation (EDNP) that is applied to Computer Assisted Language Learning (CALL) system. By comparison with state-of-the-art CALL systems, the application of this kind of network is...
This paper put forth a technique called Error-Detecting Network of Pronunciation (EDNP) that is applied to Computer Assisted Language Learning (CALL) system. By comparison with state-of-the-art CALL systems, the application of this kind of network is...
2012, 34(9): 2091-2096.
doi: 10.3724/SP.J.1146.2012.00398
Abstract:
A novel algorithm named Iterative combination of a Local nearest Neighbor search step and a Conversion step Alignment (ILNCA), a modified version of the Iterative combination of a nearest Neighor search step and a Conversion step Alignment (INCA), is...
A novel algorithm named Iterative combination of a Local nearest Neighbor search step and a Conversion step Alignment (ILNCA), a modified version of the Iterative combination of a nearest Neighor search step and a Conversion step Alignment (INCA), is...
2012, 34(9): 2097-2102.
doi: 10.3724/SP.J.1146.2012.00172
Abstract:
This paper focuses on automatic scoring about ask-and-answer item in large scale of spoken English test. Three kinds of features are extracted to score based on the text from Automatic Speech Recognition (ASR). They are similarity features, parser fe...
This paper focuses on automatic scoring about ask-and-answer item in large scale of spoken English test. Three kinds of features are extracted to score based on the text from Automatic Speech Recognition (ASR). They are similarity features, parser fe...
2012, 34(9): 2103-2109.
doi: 10.3724/SP.J.1146.2012.00097
Abstract:
Incorporated with digital beamforming processing, along-track multi-channel spaceborne SAR systems are promising in High-Resolution and Wide-Swath (HRWS) imaging by overcoming the minimum antenna area constraint. In this paper, a common phase compens...
Incorporated with digital beamforming processing, along-track multi-channel spaceborne SAR systems are promising in High-Resolution and Wide-Swath (HRWS) imaging by overcoming the minimum antenna area constraint. In this paper, a common phase compens...
2012, 34(9): 2110-2115.
doi: 10.3724/SP.J.1146.2012.00200
Abstract:
After analyzing the causes of SAR image noise and speckle model, a SAR image de-noising method is presented in Shearlet domain from the theory of image sparse representation. The proposed algorithm is to de-noise SAR image from the entire image infor...
After analyzing the causes of SAR image noise and speckle model, a SAR image de-noising method is presented in Shearlet domain from the theory of image sparse representation. The proposed algorithm is to de-noise SAR image from the entire image infor...
2012, 34(9): 2116-2121.
doi: 10.3724/SP.J.1146.2012.00147
Abstract:
This paper studies on the classification issue of turbojet, propeller and helicopter targets by using the conventional radar system. Based on the micro-Doppler effect, the echo signal model for the rotating parts of aircrafts is analyzed theoreticall...
This paper studies on the classification issue of turbojet, propeller and helicopter targets by using the conventional radar system. Based on the micro-Doppler effect, the echo signal model for the rotating parts of aircrafts is analyzed theoreticall...
2012, 34(9): 2122-2127.
doi: 10.3724/SP.J.1146.2012.00071
Abstract:
Micro-motion feature is one of the effective features used for radar target recognition in the middle section of the ballistic curve. To solve the problem of estimating spinning and structural parameters based on the micro-Doppler of the spinning war...
Micro-motion feature is one of the effective features used for radar target recognition in the middle section of the ballistic curve. To solve the problem of estimating spinning and structural parameters based on the micro-Doppler of the spinning war...
2012, 34(9): 2128-2134.
doi: 10.3724/SP.J.1146.2012.00053
Abstract:
Considering the polarization parameters of target are not usually unknown in Polarization Space Time Adaptive Processing (PSTAP), a new method which filters after estimating polarization state is advanced. The new method is deemed to reduce the compu...
Considering the polarization parameters of target are not usually unknown in Polarization Space Time Adaptive Processing (PSTAP), a new method which filters after estimating polarization state is advanced. The new method is deemed to reduce the compu...
2012, 34(9): 2135-2142.
doi: 10.3724/SP.J.1146.2011.01393
Abstract:
Alternate transmission and reception is an effective way to obtain a longer along-track baseline and additional independent phase centers to improve the performance of Ground Moving Target Indication (GMTI) in single-platform multi-channel SAR system...
Alternate transmission and reception is an effective way to obtain a longer along-track baseline and additional independent phase centers to improve the performance of Ground Moving Target Indication (GMTI) in single-platform multi-channel SAR system...
2012, 34(9): 2143-2148.
doi: 10.3724/SP.J.1146.2012.00220
Abstract:
In this paper, a method based on Nonlinear Least Squares (NLS) is presented for detecting the maneuvering aerial targets with the strong clutter background. Firstly, the signal model of the target is constructed. Secondly, the data after clutter supp...
In this paper, a method based on Nonlinear Least Squares (NLS) is presented for detecting the maneuvering aerial targets with the strong clutter background. Firstly, the signal model of the target is constructed. Secondly, the data after clutter supp...
2012, 34(9): 2149-2155.
doi: 10.3724/SP.J.1146.2012.00362
Abstract:
The similarity measures between SAR images are the basis for target recognition, image registration and so on. In this paper, a new similarity measure for uncertain SAR images based on intensity increment code is proposed after analyzing the characte...
The similarity measures between SAR images are the basis for target recognition, image registration and so on. In this paper, a new similarity measure for uncertain SAR images based on intensity increment code is proposed after analyzing the characte...
2012, 34(9): 2156-2160.
doi: 10.3724/SP.J.1146.2012.00096
Abstract:
In this paper, the best linear approximation of addition modulo 2n is studied. Firstly, the formula for maximum correlations of addition modulo 2n is proposed by using the linear approximation of the coordinate functions of addition modulo 2n. Moreov...
In this paper, the best linear approximation of addition modulo 2n is studied. Firstly, the formula for maximum correlations of addition modulo 2n is proposed by using the linear approximation of the coordinate functions of addition modulo 2n. Moreov...
2012, 34(9): 2161-2166.
doi: 10.3724/SP.J.1146.2012.00201
Abstract:
LBlock is a lightweight block cipher designed by Wu Wen-ling et al. in 2011. In this paper, a specific related-key differential is uesd to attack 19-round LBlock. The attack finds all the 80 bit keys in O(270.0) 19-round encryptions.The data complexi...
LBlock is a lightweight block cipher designed by Wu Wen-ling et al. in 2011. In this paper, a specific related-key differential is uesd to attack 19-round LBlock. The attack finds all the 80 bit keys in O(270.0) 19-round encryptions.The data complexi...
2012, 34(9): 2167-2173.
doi: 10.3724/SP.J.1146.2012.00285
Abstract:
Since BGP (Border Gateway Protocol) possesses many security vulnerabilities, BGP Autonomous System PATH information (AS_PATH attribute) is vulnerable to various attacks. In proposed BGP path verification mechanisms at present, the high computational ...
Since BGP (Border Gateway Protocol) possesses many security vulnerabilities, BGP Autonomous System PATH information (AS_PATH attribute) is vulnerable to various attacks. In proposed BGP path verification mechanisms at present, the high computational ...
2012, 34(9): 2174-2179.
doi: 10.3724/SP.J.1146.2012.00236
Abstract:
The traditional Reference Broadcast Synchronization (RBS) algorithm has a problem that network overhead is very large as the network nodes increase in Wireless sensor networks. An Energy-efficient RBS (ERBS) scheme is presented to work out the networ...
The traditional Reference Broadcast Synchronization (RBS) algorithm has a problem that network overhead is very large as the network nodes increase in Wireless sensor networks. An Energy-efficient RBS (ERBS) scheme is presented to work out the networ...
2012, 34(9): 2180-2186.
doi: 10.3724/SP.J.1146.2011.01421
Abstract:
Considering the issue of nodes failure for energy heterogeneous wireless sensor networks, a new topology with Adjustable Degree Distribution (ADD) is constructed, and the formulas of degree distribution is obtained. And then through analyzing the eff...
Considering the issue of nodes failure for energy heterogeneous wireless sensor networks, a new topology with Adjustable Degree Distribution (ADD) is constructed, and the formulas of degree distribution is obtained. And then through analyzing the eff...
2012, 34(9): 2187-2193.
doi: 10.3724/SP.J.1146.2012.00059
Abstract:
Due to the limited communication capability and energy constraint of sensor nodes, a target tracking scheme is proposed for sensor networks based on Dynamic Cluster Routing Optimization and Distributed Particle Filter (DCRO-DPF). In order to achieve ...
Due to the limited communication capability and energy constraint of sensor nodes, a target tracking scheme is proposed for sensor networks based on Dynamic Cluster Routing Optimization and Distributed Particle Filter (DCRO-DPF). In order to achieve ...
A Dynamic Routing Mechanism Based on Collection Tree Protocol in Industrial Wireless Sensor Networks
2012, 34(9): 2194-2199.
doi: 10.3724/SP.J.1146.2012.00075
Abstract:
Wireless Highway Addressable Remote Transducer (HART) is the most widely applied standard to industrial wireless sensor networks nowadays. However, it does not provide any dynamic routing mechanism, which is important for the reliability and robustne...
Wireless Highway Addressable Remote Transducer (HART) is the most widely applied standard to industrial wireless sensor networks nowadays. However, it does not provide any dynamic routing mechanism, which is important for the reliability and robustne...
2012, 34(9): 2200-2207.
doi: 10.3724/SP.J.1146.2012.00019
Abstract:
In view of shortcomings of some methods for similarity measurement, like value dependent of series elements and insufficient mining of information in series, a new method for time series compartmentation, approximation representation and similar meas...
In view of shortcomings of some methods for similarity measurement, like value dependent of series elements and insufficient mining of information in series, a new method for time series compartmentation, approximation representation and similar meas...
2012, 34(9): 2208-2212.
doi: 10.3724/SP.J.1146.2012.00144
Abstract:
Narrowband interference from other systems degrades greatly the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems in heterogeneous networks. This paper proposes a cyclostationarity-based narrowband interference suppression algo...
Narrowband interference from other systems degrades greatly the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems in heterogeneous networks. This paper proposes a cyclostationarity-based narrowband interference suppression algo...
2012, 34(9): 2213-2217.
doi: 10.3724/SP.J.1146.2012.00309
Abstract:
A target channel visiting scheme which visits target channels in a descending order of channel mean vacant time duration is proposed for proactive decision spectrum handoff in cognitive radio. It proofs that this scheme result in minimum probability ...
A target channel visiting scheme which visits target channels in a descending order of channel mean vacant time duration is proposed for proactive decision spectrum handoff in cognitive radio. It proofs that this scheme result in minimum probability ...
2012, 34(9): 2218-2223.
doi: 10.3724/SP.J.1146.2012.00275
Abstract:
In high-speed mobile environment, the orthogonality between different subcarriers in OFDM is destroyed and the performance for system decreases rapidly. In this paper, the mathematical model of Doppler spread caused by high-speed mobility is analyzed...
In high-speed mobile environment, the orthogonality between different subcarriers in OFDM is destroyed and the performance for system decreases rapidly. In this paper, the mathematical model of Doppler spread caused by high-speed mobility is analyzed...
2012, 34(9): 2224-2229.
doi: 10.3724/SP.J.1146.2012.00251
Abstract:
A method of performance optimization is proposed based on Markov process in Heterogeneous Wireless Networks (HWNs) consisting of diverse wireless networks. The method takes users mobility as an important factor affecting system performance, and users...
A method of performance optimization is proposed based on Markov process in Heterogeneous Wireless Networks (HWNs) consisting of diverse wireless networks. The method takes users mobility as an important factor affecting system performance, and users...
2012, 34(9): 2230-2235.
doi: 10.3724/SP.J.1146.2012.00121
Abstract:
Wireless Access Points (APs) deployed in the same hotspot with a high density will cause channel interference. Considering this issue, also combined with the QoS of terminals in the same Basic Service Set (BSS) and the load balance among different BS...
Wireless Access Points (APs) deployed in the same hotspot with a high density will cause channel interference. Considering this issue, also combined with the QoS of terminals in the same Basic Service Set (BSS) and the load balance among different BS...
2012, 34(9): 2236-2240.
doi: 10.3724/SP.J.1146.2011.01331
Abstract:
A resource allocation algorithm based on effective capacity theory for downlink multi-service OFDMA systems is proposed, which is focused on the real-time users QoS requirements. A two-dimensional Markov wireless channel model is established, and the...
A resource allocation algorithm based on effective capacity theory for downlink multi-service OFDMA systems is proposed, which is focused on the real-time users QoS requirements. A two-dimensional Markov wireless channel model is established, and the...
2012, 34(9): 2241-2246.
doi: 10.3724/SP.J.1146.2012.00029
Abstract:
The blind Timing Skews Estimation (TSE) issue for the Time-Interleaved Analog-to-Digital Converters (TIADC) is investigated in this paper. Accordingly to the TIADC configuration, the spectra sparsity of the analog input signal, and the non-overlappin...
The blind Timing Skews Estimation (TSE) issue for the Time-Interleaved Analog-to-Digital Converters (TIADC) is investigated in this paper. Accordingly to the TIADC configuration, the spectra sparsity of the analog input signal, and the non-overlappin...
2012, 34(9): 2247-2253.
doi: 10.3724/SP.J.1146.2012.00048
Abstract:
Through Silicon Via (TSV) is the key technology for vertical interconnections in 3D ICs, with insulator short and bump open being the two major types of TSV defects. In this paper, a TSV defect model is presented and the relationships between the lin...
Through Silicon Via (TSV) is the key technology for vertical interconnections in 3D ICs, with insulator short and bump open being the two major types of TSV defects. In this paper, a TSV defect model is presented and the relationships between the lin...
2012, 34(9): 2254-2258.
doi: 10.3724/SP.J.1146.2012.00077
Abstract:
This paper presents in-depth research into the system stability of switched-capacitor closed-loop micro- accelerometers. Universal method of dynamic characteristic analysis on such type of micro-accelerometer is imposed. Critical influencing factors ...
This paper presents in-depth research into the system stability of switched-capacitor closed-loop micro- accelerometers. Universal method of dynamic characteristic analysis on such type of micro-accelerometer is imposed. Critical influencing factors ...
2012, 34(9): 2259-2262.
doi: 10.3724/SP.J.1146.2011.01023
Abstract:
Zodiac is a block cipher designed by a group of Korean experts. This paper studies the security of Zodiac against the meet-in-the-middle attack for the first time. Some new 9-round and 10-round distinguishers of Zodiac are found, and based on which s...
Zodiac is a block cipher designed by a group of Korean experts. This paper studies the security of Zodiac against the meet-in-the-middle attack for the first time. Some new 9-round and 10-round distinguishers of Zodiac are found, and based on which s...
2012, 34(9): 2263-2267.
doi: 10.3724/SP.J.1146.2012.00185
Abstract:
Enhanced SAR ocean images with wind wave signatures and reserved other oceanographic features can promote oceanographic applications. Based on the Goldstein interferogram filter, the enhanced parameter is adaptively determined by the wind wave spectr...
Enhanced SAR ocean images with wind wave signatures and reserved other oceanographic features can promote oceanographic applications. Based on the Goldstein interferogram filter, the enhanced parameter is adaptively determined by the wind wave spectr...
2012, 34(9): 2268-2272.
doi: 10.3724/SP.J.1146.2012.00136
Abstract:
It remains a challenging task to restore the image which is contaminated with heavy noise. In this paper, an image denoising method is proposed based on sparse representations. In the dictionary training stage, a matching criterion based on correlati...
It remains a challenging task to restore the image which is contaminated with heavy noise. In this paper, an image denoising method is proposed based on sparse representations. In the dictionary training stage, a matching criterion based on correlati...
2012, 34(9): 2273-2276.
doi: 10.3724/SP.J.1146.2012.00193
Abstract:
In this paper, the linear structure of Rotation Symmetric Boolean Functions (RSBF) is studied. The relationship between the degree and the existence of linear structures in RSBFs is investigated. The open problem that an-variable RSBF being balanced ...
In this paper, the linear structure of Rotation Symmetric Boolean Functions (RSBF) is studied. The relationship between the degree and the existence of linear structures in RSBFs is investigated. The open problem that an-variable RSBF being balanced ...
2012, 34(9): 2277-2281.
doi: 10.3724/SP.J.1146.2012.00104
Abstract:
ZigBee nodes are deficient in identity authentication and key distribution security. For purpose of solving those issues, an identity-based ZigBee identity authentication and key distribution scheme without weil pairing is proposed. This scheme bears...
ZigBee nodes are deficient in identity authentication and key distribution security. For purpose of solving those issues, an identity-based ZigBee identity authentication and key distribution scheme without weil pairing is proposed. This scheme bears...
2012, 34(9): 2282-2286.
doi: 10.3724/SP.J.1146.2012.00064
Abstract:
Simulation and experiments of the output system for an L-band 10 MW multi-beam klystron are carried out. Parameters of the two-port six-beam coaxial output cavity, such as frequency, quality factor and character impedance, are calculated and analyzed...
Simulation and experiments of the output system for an L-band 10 MW multi-beam klystron are carried out. Parameters of the two-port six-beam coaxial output cavity, such as frequency, quality factor and character impedance, are calculated and analyzed...
