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2006 Vol. 28, No. 12
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2006, 28(12): 2209-2213.
Abstract:
Aiming at giving a precise estimation of the statistic distribution of high-resolution Synthetic Aperture Radar (SAR) images, a segmentation method of SAR images using technique of non-parametric density estimate with kernel method and Markovian cont...
Aiming at giving a precise estimation of the statistic distribution of high-resolution Synthetic Aperture Radar (SAR) images, a segmentation method of SAR images using technique of non-parametric density estimate with kernel method and Markovian cont...
2006, 28(12): 2214-2218.
Abstract:
In usual spatial-time processing for diversity reception of UWB pulses, the channel delays are not easy to be implemented accurately. This paper firstly discusses the principle of UWB pulse array beamforming. Then a beamforming scheme is presented ba...
In usual spatial-time processing for diversity reception of UWB pulses, the channel delays are not easy to be implemented accurately. This paper firstly discusses the principle of UWB pulse array beamforming. Then a beamforming scheme is presented ba...
2006, 28(12): 2219-2223.
Abstract:
According to the characteristic that Forward Looking Ground Penetrating Radar (FLGPR) wave incidents aslant and propagates through two layer medium of the air and the ground, the Frequency-Wavenumber (F-W) Synthetic Aperture Imaging (SAI) method of F...
According to the characteristic that Forward Looking Ground Penetrating Radar (FLGPR) wave incidents aslant and propagates through two layer medium of the air and the ground, the Frequency-Wavenumber (F-W) Synthetic Aperture Imaging (SAI) method of F...
2006, 28(12): 2224-2227.
Abstract:
The Space-Time Adaptive Processing (STAP) algorithm of multi-channel airborne radar requires very high computing power and hardly implements. In this paper, detail analysis of computation steps of partially adaptive STAP algorithm is presents, which ...
The Space-Time Adaptive Processing (STAP) algorithm of multi-channel airborne radar requires very high computing power and hardly implements. In this paper, detail analysis of computation steps of partially adaptive STAP algorithm is presents, which ...
2006, 28(12): 2228-2231.
Abstract:
In order to transmit directly E-pulse for target identification, a general coefficient expression of the Fourier series for a special coded signal with a rectangle base is theoretically deduced in this paper. Then an E-pulse waveform synthesis method...
In order to transmit directly E-pulse for target identification, a general coefficient expression of the Fourier series for a special coded signal with a rectangle base is theoretically deduced in this paper. Then an E-pulse waveform synthesis method...
2006, 28(12): 2232-2235.
Abstract:
Chirp Scaling (CS) imaging algorithm is derived and implemented in this paper, which is adapted to bistatic and squinted radar in distributed satellites Interferometric Synthetic Aperture Radar (InSAR) system. Considering the characteristic of baseli...
Chirp Scaling (CS) imaging algorithm is derived and implemented in this paper, which is adapted to bistatic and squinted radar in distributed satellites Interferometric Synthetic Aperture Radar (InSAR) system. Considering the characteristic of baseli...
2006, 28(12): 2236-2239.
Abstract:
Relative height accuracy is one of key indexes for SAR interferometry. In this paper, based on actual geometrical condition for master satellite and distributed small satellite SAR system, height measure principle is established. Based on geometrical...
Relative height accuracy is one of key indexes for SAR interferometry. In this paper, based on actual geometrical condition for master satellite and distributed small satellite SAR system, height measure principle is established. Based on geometrical...
2006, 28(12): 2240-2243.
Abstract:
The effect of transponder time-delay on amplitude and phase of both range-compressed and azimuth-compressed signal are researched. Through simulation, the impact of transponder time-delay on imaging location, main-lobe, side-lobe of point target puls...
The effect of transponder time-delay on amplitude and phase of both range-compressed and azimuth-compressed signal are researched. Through simulation, the impact of transponder time-delay on imaging location, main-lobe, side-lobe of point target puls...
2006, 28(12): 2244-2247.
Abstract:
The characteristic of the echo of the wide swath airborne Synthetic Aperture Radar (SAR) is analyzed, then the expression of the shaped beam radiation pattern in the range plane of antenna is induced . The pattern is synthesized using the Schelkunoff...
The characteristic of the echo of the wide swath airborne Synthetic Aperture Radar (SAR) is analyzed, then the expression of the shaped beam radiation pattern in the range plane of antenna is induced . The pattern is synthesized using the Schelkunoff...
2006, 28(12): 2248-2251.
Abstract:
some research on adaptive calibration of LFM signal is implemented in this paper. Via theoretic analysis, the optimum step size and minimum misadjustment are obtained. At last, computer simulation indicate that the theoretic analysis has some value o...
some research on adaptive calibration of LFM signal is implemented in this paper. Via theoretic analysis, the optimum step size and minimum misadjustment are obtained. At last, computer simulation indicate that the theoretic analysis has some value o...
2006, 28(12): 2252-2255.
Abstract:
Analyzing errors of single observer-sequential BO (Bearing Only) passive location technology, a Maximum likelihood method is introduced based on 1-D coding improved genetic algorithm, in which basic least square algorithm is applied for pre-estimatio...
Analyzing errors of single observer-sequential BO (Bearing Only) passive location technology, a Maximum likelihood method is introduced based on 1-D coding improved genetic algorithm, in which basic least square algorithm is applied for pre-estimatio...
2006, 28(12): 2256-2258.
Abstract:
The problem that this paper discusses is how to separate the origin signals from the mixed satellite signals. The traditional method to solve the kind of problem adopts the algorithm of blind convolution which needs much account to adjust the all pat...
The problem that this paper discusses is how to separate the origin signals from the mixed satellite signals. The traditional method to solve the kind of problem adopts the algorithm of blind convolution which needs much account to adjust the all pat...
2006, 28(12): 2259-2262.
Abstract:
A new blind beamforming algorithm for non-Gaussian signals with arbitrary kurtosis is presented in this paper. Based on Kurtosis Maximization Algorithm (KMA), a new cost function is defined by introducing the cross-correlation of two signals. This me...
A new blind beamforming algorithm for non-Gaussian signals with arbitrary kurtosis is presented in this paper. Based on Kurtosis Maximization Algorithm (KMA), a new cost function is defined by introducing the cross-correlation of two signals. This me...
2006, 28(12): 2263-2268.
Abstract:
An adaptive weighted spatial smoothing algorithm is developed for adaptive arrays. By constructing a virtual issue of adaptive beamforming, the weight vector is obtained to weight the covariance matrixes of subarrays. Then, weighted spatial smoothing...
An adaptive weighted spatial smoothing algorithm is developed for adaptive arrays. By constructing a virtual issue of adaptive beamforming, the weight vector is obtained to weight the covariance matrixes of subarrays. Then, weighted spatial smoothing...
2006, 28(12): 2269-2272.
Abstract:
A modified Wiener post-filter beamforming for speech enhancement is presented. The proposed algorithm focuses on the estimation of the ideal signals power spectrum for the Wiener filter, both auto-correlation and cross-correlation are taken into cons...
A modified Wiener post-filter beamforming for speech enhancement is presented. The proposed algorithm focuses on the estimation of the ideal signals power spectrum for the Wiener filter, both auto-correlation and cross-correlation are taken into cons...
2006, 28(12): 2273-2276.
Abstract:
Ridgelet is a new signal analysis method; it is especially suitable for describing the 2-D signals which have linear or super-plane singularities. Recently, an orthonormal version of Ridgelet for discrete and finite-size images is presented, named Fi...
Ridgelet is a new signal analysis method; it is especially suitable for describing the 2-D signals which have linear or super-plane singularities. Recently, an orthonormal version of Ridgelet for discrete and finite-size images is presented, named Fi...
2006, 28(12): 2277-2282.
Abstract:
In this paper, a novel fast motion estimation algorithm called the motion vector field and direction adaptive search is proposed. According to center-bias property and spatial-temporal correlation of the motion vector field, the type of local motion ...
In this paper, a novel fast motion estimation algorithm called the motion vector field and direction adaptive search is proposed. According to center-bias property and spatial-temporal correlation of the motion vector field, the type of local motion ...
2006, 28(12): 2283-2286.
Abstract:
The procedure of captured iris requires considerable cooperation from the user. The method using wavefront to extend the depth-of-field of the image capture system is expatiated in the paper. The feasibility and method of realization are given in det...
The procedure of captured iris requires considerable cooperation from the user. The method using wavefront to extend the depth-of-field of the image capture system is expatiated in the paper. The feasibility and method of realization are given in det...
2006, 28(12): 2287-2291.
Abstract:
To improve the performance of the image segmentation algorithm, a relative fuzzy connected interactive segmentation algorithm is presented based on Redundant Wavelet Transform (RWT). In comparison with the original scale-based algorithm, the proposed...
To improve the performance of the image segmentation algorithm, a relative fuzzy connected interactive segmentation algorithm is presented based on Redundant Wavelet Transform (RWT). In comparison with the original scale-based algorithm, the proposed...
2006, 28(12): 2292-2295.
Abstract:
This paper describes the work on the development of an audio segmentation and classification system applied to a broadcast news task for Chinese language. Three-phase automatic audio segmentation algorithm is provided. Audio stream is cut to audio se...
This paper describes the work on the development of an audio segmentation and classification system applied to a broadcast news task for Chinese language. Three-phase automatic audio segmentation algorithm is provided. Audio stream is cut to audio se...
2006, 28(12): 2296-2300.
Abstract:
Face recognition tasks always encounter Small Sample Size (SSS) problem, which leads to the ill-posed problem in Fisher Linear Discriminant Analysis (FLDA). The Discriminative Common Vector (DCV) successfully overcomes this problem for FLDA. In this ...
Face recognition tasks always encounter Small Sample Size (SSS) problem, which leads to the ill-posed problem in Fisher Linear Discriminant Analysis (FLDA). The Discriminative Common Vector (DCV) successfully overcomes this problem for FLDA. In this ...
2006, 28(12): 2301-2304.
Abstract:
Markov Random Field Model (MRFM) is separated into four Markov chains which are used to represent the residuals of encoded image source. Combined with the soft output of Low Density Parity Check (LDPC) code, this simplified model is used in joint sou...
Markov Random Field Model (MRFM) is separated into four Markov chains which are used to represent the residuals of encoded image source. Combined with the soft output of Low Density Parity Check (LDPC) code, this simplified model is used in joint sou...
2006, 28(12): 2305-2309.
Abstract:
In this paper, a iterative receiver is introduced for convolutionally coded distributed MIMO with V-BLAST architecture. A maximum-likelihood (ML) iterative detector and a low-complexity Turbo detection scheme are proposed. The computational complexit...
In this paper, a iterative receiver is introduced for convolutionally coded distributed MIMO with V-BLAST architecture. A maximum-likelihood (ML) iterative detector and a low-complexity Turbo detection scheme are proposed. The computational complexit...
2006, 28(12): 2310-2314.
Abstract:
Based on the type-Ⅱand type-Ⅲ Hybrid Automatic Repeat reQuest (HARQ) system and Rata Compatible Punctured Convolutional (RCPC) code, a new HARQ system is proposed in which F sub-packets could be transmitted in one data packet, at receiver the same F ...
Based on the type-Ⅱand type-Ⅲ Hybrid Automatic Repeat reQuest (HARQ) system and Rata Compatible Punctured Convolutional (RCPC) code, a new HARQ system is proposed in which F sub-packets could be transmitted in one data packet, at receiver the same F ...
2006, 28(12): 2315-2317.
Abstract:
In this paper, based on (n,2,k) regular Low Density Parity-Check (LDPC) codes without short cycles, a geometry method for the construction of(n,3,k) regular LDPC codes with 8-girth is proposed,which is simple,intuitionistic and effective. Simulation ...
In this paper, based on (n,2,k) regular Low Density Parity-Check (LDPC) codes without short cycles, a geometry method for the construction of(n,3,k) regular LDPC codes with 8-girth is proposed,which is simple,intuitionistic and effective. Simulation ...
2006, 28(12): 2318-2322.
Abstract:
A time-frequency analysis method, named HHT(Hilbert-Huang Transformation), is applied to the demodulation of 2FSK systems. This method, based on the characteristics of the signal itself, is often used to analyze the instantaneous frequency distributi...
A time-frequency analysis method, named HHT(Hilbert-Huang Transformation), is applied to the demodulation of 2FSK systems. This method, based on the characteristics of the signal itself, is often used to analyze the instantaneous frequency distributi...
2006, 28(12): 2323-2324.
Abstract:
One of key assumptions of currently popular space-time processing technology is that receiver knows MIMO channel state information(CSI). Because MIMO channel is time-varying, how to track channel is veryimportant. In this paper, blind tracking of nar...
One of key assumptions of currently popular space-time processing technology is that receiver knows MIMO channel state information(CSI). Because MIMO channel is time-varying, how to track channel is veryimportant. In this paper, blind tracking of nar...
2006, 28(12): 2325-2329.
Abstract:
Frequency offset tracking is one of the key technologies that affect OFDM systems performance. Based on early-late gate phase-locked loop, a new frequency offset tracking algorithm is proposed in this paper. The study shows that the algorithm can com...
Frequency offset tracking is one of the key technologies that affect OFDM systems performance. Based on early-late gate phase-locked loop, a new frequency offset tracking algorithm is proposed in this paper. The study shows that the algorithm can com...
2006, 28(12): 2330-2333.
Abstract:
This paper firstly analyzes the eigenvalue distribution in environment with different angle spread and DOA. Secondly, the performance of different beamforming algorithms are investigated first in diverse environment. Then a beamforming scheme based o...
This paper firstly analyzes the eigenvalue distribution in environment with different angle spread and DOA. Secondly, the performance of different beamforming algorithms are investigated first in diverse environment. Then a beamforming scheme based o...
2006, 28(12): 2334-2338.
Abstract:
Distributed radio mobile communications system consists of Base Station (BS) and some Remote Antenna Units (RAUs) connecting with BS by wireline or wireless transmission. RAU selection scheme will influence the system performance. In this paper, RAU ...
Distributed radio mobile communications system consists of Base Station (BS) and some Remote Antenna Units (RAUs) connecting with BS by wireline or wireless transmission. RAU selection scheme will influence the system performance. In this paper, RAU ...
2006, 28(12): 2339-2342.
Abstract:
The pilot-assisted channel estimation method is studied in time-division multiplexing Rayleigh fading channel. A channel tracking method is proposed by using the Chebyshev interpolation polynomials after the channel coefficients of pilot symbols in a...
The pilot-assisted channel estimation method is studied in time-division multiplexing Rayleigh fading channel. A channel tracking method is proposed by using the Chebyshev interpolation polynomials after the channel coefficients of pilot symbols in a...
2006, 28(12): 2343-2346.
Abstract:
Differential Unitary Space-Time Modulation (DUSTM), which is a multi-antenna modulation technique for time-varying fading channels, can obtain full diversity gains without channel state information at the receiver in slowly fading channels. For fast ...
Differential Unitary Space-Time Modulation (DUSTM), which is a multi-antenna modulation technique for time-varying fading channels, can obtain full diversity gains without channel state information at the receiver in slowly fading channels. For fast ...
2006, 28(12): 2347-2350.
Abstract:
Based on perfect sequences and orthogonal sequence sets, a new class of mutually orthogonal sets of zero correlation zone sequences is presented. Different from the construction given by Rathinakumar and Chaturvedi, the proposed method can generate m...
Based on perfect sequences and orthogonal sequence sets, a new class of mutually orthogonal sets of zero correlation zone sequences is presented. Different from the construction given by Rathinakumar and Chaturvedi, the proposed method can generate m...
2006, 28(12): 2351-2354.
Abstract:
Directed by Shannons disorder theory, this paper present a scheme for generating key sequences by using the sensitivity to initial values and the long time unpredictability of chaos motion. The generating scheme and process of the key sequence are de...
Directed by Shannons disorder theory, this paper present a scheme for generating key sequences by using the sensitivity to initial values and the long time unpredictability of chaos motion. The generating scheme and process of the key sequence are de...
2006, 28(12): 2355-2358.
Abstract:
Maitra and Sarkar provided a recursive construction method of balanced correlation-immune Boolean functions on n variables in 1999. In this paper, a new method is provided to construct balanced m-th order correlation-immune Boolean functions on n var...
Maitra and Sarkar provided a recursive construction method of balanced correlation-immune Boolean functions on n variables in 1999. In this paper, a new method is provided to construct balanced m-th order correlation-immune Boolean functions on n var...
2006, 28(12): 2359-2361.
Abstract:
Based on the characteristic of the chaotic secure communication system, transmitting the sending signal by the standard digital channel is proposed in this paper. The results show that this method is simple, flexible and reliable in the performance.
Based on the characteristic of the chaotic secure communication system, transmitting the sending signal by the standard digital channel is proposed in this paper. The results show that this method is simple, flexible and reliable in the performance.
2006, 28(12): 2362-2366.
Abstract:
EBCOT algorithm is an essential part of the new image compression standard, JPEG2000. The Tier1 part of EBCOT requires each bit-plane be scanned for three times in order to generate entropy contexts. Therefore the scanning efficiency is unacceptable，...
EBCOT algorithm is an essential part of the new image compression standard, JPEG2000. The Tier1 part of EBCOT requires each bit-plane be scanned for three times in order to generate entropy contexts. Therefore the scanning efficiency is unacceptable，...
2006, 28(12): 2367-2370.
Abstract:
A novel blind channel estimation scheme is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems employing PSK modulation. This scheme is composed of obtaining a small number of possible channels by exploiting the constant modulus pr...
A novel blind channel estimation scheme is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems employing PSK modulation. This scheme is composed of obtaining a small number of possible channels by exploiting the constant modulus pr...
2006, 28(12): 2371-2373.
Abstract:
In this paper, an iterative method is presented to estimate Hurst index, and it is applied to both FGN (Fractional Gaussian Noise) data and real traffic data. Experimental results demonstrate that this method is much faster and has smaller confidence...
In this paper, an iterative method is presented to estimate Hurst index, and it is applied to both FGN (Fractional Gaussian Noise) data and real traffic data. Experimental results demonstrate that this method is much faster and has smaller confidence...
2006, 28(12): 2374-2377.
Abstract:
Optical Burst Switching (OBS) is considered as an efficient switching technique for the next generation optical networks. QoS (Quality of Service) support is an important issue in OBS networks. This paper focuses mainly on the QoS algorithms based on...
Optical Burst Switching (OBS) is considered as an efficient switching technique for the next generation optical networks. QoS (Quality of Service) support is an important issue in OBS networks. This paper focuses mainly on the QoS algorithms based on...
2006, 28(12): 2378-2381.
Abstract:
This paper proposes Chinese Remainder Theorem-based Secret Sharing (CRTSS) scheme, a new Multicast Key Management (MKM) scheme, which adopts the Chinese remainder theorem and Shamirs secret sharing method. With comparing and analyzing GKMP and CRTSS ...
This paper proposes Chinese Remainder Theorem-based Secret Sharing (CRTSS) scheme, a new Multicast Key Management (MKM) scheme, which adopts the Chinese remainder theorem and Shamirs secret sharing method. With comparing and analyzing GKMP and CRTSS ...
2006, 28(12): 2382-2385.
Abstract:
In this paper, the principle of the network pricing strategy (Per-Packet Billing，PPB) which is based on per-packet is proposed, the concept model of PPB and the simple implementation scheme is also presented. Aimed at the three kinds of services FTP,...
In this paper, the principle of the network pricing strategy (Per-Packet Billing，PPB) which is based on per-packet is proposed, the concept model of PPB and the simple implementation scheme is also presented. Aimed at the three kinds of services FTP,...
2006, 28(12): 2386-2389.
Abstract:
In this paper, a novel scheme to detect Byzantine fault on mobile Ad hoc network is presented. A fault-tolerant algorithm is introduced combined with CBRP, which improves the security and reliability of manet(mobile Ad hoc network). Algorithm analysi...
In this paper, a novel scheme to detect Byzantine fault on mobile Ad hoc network is presented. A fault-tolerant algorithm is introduced combined with CBRP, which improves the security and reliability of manet(mobile Ad hoc network). Algorithm analysi...
2006, 28(12): 2390-2393.
Abstract:
This article proposes a new easy knapsack problem, based on which a novel knapsack-type public key cryptosystem is derived. The cryptosystem obtains a high knapsack density, and hence it is secure against low density subset-sum attack. Some other att...
This article proposes a new easy knapsack problem, based on which a novel knapsack-type public key cryptosystem is derived. The cryptosystem obtains a high knapsack density, and hence it is secure against low density subset-sum attack. Some other att...
2006, 28(12): 2394-2397.
Abstract:
Key management is one of the most important technologies on the security mechanism of wireless sensor network. Compared with all kinds of key management schemes, group key management is more suitable for wireless sensor network. According to the root...
Key management is one of the most important technologies on the security mechanism of wireless sensor network. Compared with all kinds of key management schemes, group key management is more suitable for wireless sensor network. According to the root...
The Fast Calculation of RCS of Electrically Large Open-Ended Cavities
Combine IPO, FMM, RPFMM, FaFFA
2006, 28(12): 2398-2401.
Abstract:
IPO+FMM method can rapidly solve the scattering of three-dimensional cavity. In the conventional Fast Multipole Method (FMM), at all directions of translation between two groups should be computed, it is expensive. The Ray-Propagation Fast Multipole ...
IPO+FMM method can rapidly solve the scattering of three-dimensional cavity. In the conventional Fast Multipole Method (FMM), at all directions of translation between two groups should be computed, it is expensive. The Ray-Propagation Fast Multipole ...
2006, 28(12): 2402-2404.
Abstract:
In this paper, the field analysis method for calculating the characteristic parameters of the output circuit in the klystron is presented. The electromagnetic component under proper assumptions and the simple equivalence is studied by three-dimension...
In this paper, the field analysis method for calculating the characteristic parameters of the output circuit in the klystron is presented. The electromagnetic component under proper assumptions and the simple equivalence is studied by three-dimension...
2006, 28(12): 2405-2408.
Abstract:
A context-based quantization and sorting algorithm used in wavelet image coding is proposed. The context template in the scheme is the same as JPEG2000s. The optimum context-based quantization is achieved by the means of dynamic programming for minim...
A context-based quantization and sorting algorithm used in wavelet image coding is proposed. The context template in the scheme is the same as JPEG2000s. The optimum context-based quantization is achieved by the means of dynamic programming for minim...
