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2007 Vol. 29, No. 2
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2007, 29(2): 255-259.
doi: 10.3724/SP.J.1146.2005.00960
Abstract:
SNR maximum likelihood estimator based on data directed decision was evaluated first, and was concluded as a biased estimator. An unbiased estimator can be acquired through high order moments of received data. Two SNR estimators based on iteration me...
SNR maximum likelihood estimator based on data directed decision was evaluated first, and was concluded as a biased estimator. An unbiased estimator can be acquired through high order moments of received data. Two SNR estimators based on iteration me...
2007, 29(2): 260-264.
doi: 10.3724/SP.J.1146.2005.00952
Abstract:
An improved iterative detection algorithm is proposed in this paper, which introduces a new method of computing soft information based on the idea of semidefinite relaxation rather than on a list. Also a head-first list search algorithm is put forwar...
An improved iterative detection algorithm is proposed in this paper, which introduces a new method of computing soft information based on the idea of semidefinite relaxation rather than on a list. Also a head-first list search algorithm is put forwar...
2007, 29(2): 265-268.
doi: 10.3724/SP.J.1146.2005.00813
Abstract:
Relayed transmission is an efficient method to improve the power efficiency and system capacity. In this paper, subcarrier pair selection and power allocation in broadband OFDM relaying system is addressed. Firstly, an equivalent channel gain model f...
Relayed transmission is an efficient method to improve the power efficiency and system capacity. In this paper, subcarrier pair selection and power allocation in broadband OFDM relaying system is addressed. Firstly, an equivalent channel gain model f...
2007, 29(2): 269-273.
doi: 10.3724/SP.J.1146.2005.00509
Abstract:
A new algorithm for searching the optimal puncture matrices of the rate compatible punctured Turbo(RCPT) codes is proposed. The algorithm is based on density evolution and its main goal is to analyze the thresholds for different puncture matrices. Th...
A new algorithm for searching the optimal puncture matrices of the rate compatible punctured Turbo(RCPT) codes is proposed. The algorithm is based on density evolution and its main goal is to analyze the thresholds for different puncture matrices. Th...
2007, 29(2): 274-277.
doi: 10.3724/SP.J.1146.2005.01579
Abstract:
Convergence of Serially Concatenated Continuous Phase Modulation (SCCPM) is studied. Based on the theory of dynamic system, phenomena of positive feedback during iterative detection are analyzed, and improved methods are proposed from the views of de...
Convergence of Serially Concatenated Continuous Phase Modulation (SCCPM) is studied. Based on the theory of dynamic system, phenomena of positive feedback during iterative detection are analyzed, and improved methods are proposed from the views of de...
2007, 29(2): 278-282.
doi: 10.3724/SP.J.1146.2005.00614
Abstract:
This paper discusses two traceback algorithms for Viterbi decoder. The realization methods for the traceback algorithms with FPGA are given through optimization for the hardware architecture. The comparison between the two realization methods is give...
This paper discusses two traceback algorithms for Viterbi decoder. The realization methods for the traceback algorithms with FPGA are given through optimization for the hardware architecture. The comparison between the two realization methods is give...
2007, 29(2): 283-286.
doi: 10.3724/SP.J.1146.2005.00743
Abstract:
Constant modulus algorithm is a most popular algorithm and is widely used for blind equalization of non-constant envelope signals and constant envelope signals. But it exhibits very slow convergence speed and large residual error. A modified variable...
Constant modulus algorithm is a most popular algorithm and is widely used for blind equalization of non-constant envelope signals and constant envelope signals. But it exhibits very slow convergence speed and large residual error. A modified variable...
2007, 29(2): 287-290.
doi: 10.3724/SP.J.1146.2005.01499
Abstract:
A based-MSE semi-blind multiuser detection algorithm of asynchronous fast-frequency hopping multiply access communication system is proposed, which exploit the difference of arrive time of asynchronous user and coordinate of signal energy of desired ...
A based-MSE semi-blind multiuser detection algorithm of asynchronous fast-frequency hopping multiply access communication system is proposed, which exploit the difference of arrive time of asynchronous user and coordinate of signal energy of desired ...
2007, 29(2): 291-295.
doi: 10.3724/SP.J.1146.2005.00711
Abstract:
In the spread spectrum communication, the characteristics of spreading sequences are important to the anti-jamming,anti multi-path fading,the low probability of intercept and the acquisition of the system. The characteristics of the spreading codes h...
In the spread spectrum communication, the characteristics of spreading sequences are important to the anti-jamming,anti multi-path fading,the low probability of intercept and the acquisition of the system. The characteristics of the spreading codes h...
2007, 29(2): 296-300.
doi: 10.3724/SP.J.1146.2005.00902
Abstract:
The performance of Transmit Antenna Selection (TAS) with imperfect feedback is analysed in this paper. An asymptotic method is presented to approach the Symbol Error Probability(SEP) of TAS with imperfect feedback. This method can be applied to arbit...
The performance of Transmit Antenna Selection (TAS) with imperfect feedback is analysed in this paper. An asymptotic method is presented to approach the Symbol Error Probability(SEP) of TAS with imperfect feedback. This method can be applied to arbit...
2007, 29(2): 301-304.
doi: 10.3724/SP.J.1146.2005.00886
Abstract:
This paper investigates the impact of feedback period and delay on the performance of Multiple-Input Multiple-Output (MIMO) systems with adaptive modulation, and analyzes the characteristics of the equivalent parallel fading subchannels obtained by S...
This paper investigates the impact of feedback period and delay on the performance of Multiple-Input Multiple-Output (MIMO) systems with adaptive modulation, and analyzes the characteristics of the equivalent parallel fading subchannels obtained by S...
2007, 29(2): 305-309.
doi: 10.3724/SP.J.1146.2006.00599
Abstract:
In distributed radio mobile communications system, Remote Antenna Unit (RAU) selection scheme will influence the system performance. In this paper, a selection model is presented for RAU selection in distributed radio system based on soft handoff the...
In distributed radio mobile communications system, Remote Antenna Unit (RAU) selection scheme will influence the system performance. In this paper, a selection model is presented for RAU selection in distributed radio system based on soft handoff the...
2007, 29(2): 310-313.
doi: 10.3724/SP.J.1146.2005.00740
Abstract:
This paper proposes a method of channel estimation based on adaptive filters in wireless MIMO-OFDM systems. Though this method does not require any prior knowledge of channel statistics, it can track and estimate time-varying channel instantaneously ...
This paper proposes a method of channel estimation based on adaptive filters in wireless MIMO-OFDM systems. Though this method does not require any prior knowledge of channel statistics, it can track and estimate time-varying channel instantaneously ...
2007, 29(2): 314-318.
doi: 10.3724/SP.J.1146.2005.00907
Abstract:
This paper analyzes the parallel estimation method of the fast fading channel in the present of impulse noise. In wireless system, the fast fading channel is typically modeled as the AR (Auto-Regressive) process. LS (Least Square) algorithm and adapt...
This paper analyzes the parallel estimation method of the fast fading channel in the present of impulse noise. In wireless system, the fast fading channel is typically modeled as the AR (Auto-Regressive) process. LS (Least Square) algorithm and adapt...
2007, 29(2): 319-322.
doi: 10.3724/SP.J.1146.2006.01024
Abstract:
This paper proposes a generalized selection cooperative diversity and its improved scheme with threshold selection for multi-hop wireless networks. The regenerative capacity performances for the proposed schemes are analyzed and derived over Rayleigh...
This paper proposes a generalized selection cooperative diversity and its improved scheme with threshold selection for multi-hop wireless networks. The regenerative capacity performances for the proposed schemes are analyzed and derived over Rayleigh...
2007, 29(2): 323-327.
doi: 10.3724/SP.J.1146.2005.00600
Abstract:
This paper focuses on how to maintain the wireless network connectivity and performance while reducing the maintenance overhead as some nodes fail. A topology maintenance algorithm based on the shortest path tree is proposed. In this algorithm, the n...
This paper focuses on how to maintain the wireless network connectivity and performance while reducing the maintenance overhead as some nodes fail. A topology maintenance algorithm based on the shortest path tree is proposed. In this algorithm, the n...
2007, 29(2): 328-332.
doi: 10.3724/SP.J.1146.2005.01617
Abstract:
The paper proposes a new MAC protocol to improve the capacity of 802.11b. IEEE 802.11b provides very high raw bandwidth. However, the overheads introduced by the physical and MAC layers are also increasingly substantial. Moreover, there are two kinds...
The paper proposes a new MAC protocol to improve the capacity of 802.11b. IEEE 802.11b provides very high raw bandwidth. However, the overheads introduced by the physical and MAC layers are also increasingly substantial. Moreover, there are two kinds...
2007, 29(2): 333-339.
doi: 10.3724/SP.J.1146.2005.00792
Abstract:
It is a key issue in wireless multi-hop Ad hoc networks to develop a Media Access Control (MAC) protocol by which the contending nodes can share the wireless channel fairly and can fully utilize the network capacity. Considering the characteristics o...
It is a key issue in wireless multi-hop Ad hoc networks to develop a Media Access Control (MAC) protocol by which the contending nodes can share the wireless channel fairly and can fully utilize the network capacity. Considering the characteristics o...
2007, 29(2): 340-344.
doi: 10.3724/SP.J.1146.2005.00727
Abstract:
In order to implement multi-destination and multi-path anycast routing on the heavy load network, an anycast routing based on improved ant colony algorithm is proposed in this paper according to the similar between ant searching path and anycast rout...
In order to implement multi-destination and multi-path anycast routing on the heavy load network, an anycast routing based on improved ant colony algorithm is proposed in this paper according to the similar between ant searching path and anycast rout...
2007, 29(2): 345-349.
doi: 10.3724/SP.J.1146.2005.00607
Abstract:
Peer to Peer (P2P) computing technology provides the basic operation facility for collaborations among nodes of open and dynamic network (esp. Internet) and complicated distributed business processing. However, it is difficult to accomplish such work...
Peer to Peer (P2P) computing technology provides the basic operation facility for collaborations among nodes of open and dynamic network (esp. Internet) and complicated distributed business processing. However, it is difficult to accomplish such work...
2007, 29(2): 350-354.
doi: 10.3724/SP.J.1146.2005.00733
Abstract:
In the dense complex signal radar environment, the estimation of the parameters Pulse Repetition Interval (PRI) and deinterleaving is a tedious problem. This paper presents a new method, named Square Sine Wave Interpolating Algorithm (SSWIA ) for dei...
In the dense complex signal radar environment, the estimation of the parameters Pulse Repetition Interval (PRI) and deinterleaving is a tedious problem. This paper presents a new method, named Square Sine Wave Interpolating Algorithm (SSWIA ) for dei...
2007, 29(2): 355-359.
doi: 10.3724/SP.J.1146.2006.00679
Abstract:
This paper proposes a fused algorithm based on fuzzy integral. This method firstly obtains belief function using the wavelet coefficient of multispectral images and panchromatic images ,then constructs fuzzy density adaptively using the deviation of ...
This paper proposes a fused algorithm based on fuzzy integral. This method firstly obtains belief function using the wavelet coefficient of multispectral images and panchromatic images ,then constructs fuzzy density adaptively using the deviation of ...
2007, 29(2): 360-364.
doi: 10.3724/SP.J.1146.2005.00654
Abstract:
This paper presents a signal based Doppler rate estimation and compensation method to form a well focused Ultra-Wide Band Synthetic Aperture Radar (UWB-SAR) image. A refined MapDriftt(MD) autofocus technique is promoted to improve its original perfor...
This paper presents a signal based Doppler rate estimation and compensation method to form a well focused Ultra-Wide Band Synthetic Aperture Radar (UWB-SAR) image. A refined MapDriftt(MD) autofocus technique is promoted to improve its original perfor...
2007, 29(2): 365-369.
doi: 10.3724/SP.J.1146.2005.00540
Abstract:
Analog Time Delay Units (TDUs) are usually used for wideband phased array beamforming, but quatilization error and high cost restrict its applications. This paper presents a new wideband digital beamforming method using subarrays and Linear Frequency...
Analog Time Delay Units (TDUs) are usually used for wideband phased array beamforming, but quatilization error and high cost restrict its applications. This paper presents a new wideband digital beamforming method using subarrays and Linear Frequency...
2007, 29(2): 370-374.
doi: 10.3724/SP.J.1146.2005.00562
Abstract:
A novel method of target aspect estimation in SAR imagery based on Hough transform and major axis extraction is proposed here, which fully exploits the information contained in the major axis of the target. Firstly, the accurate contour of the target...
A novel method of target aspect estimation in SAR imagery based on Hough transform and major axis extraction is proposed here, which fully exploits the information contained in the major axis of the target. Firstly, the accurate contour of the target...
2007, 29(2): 375-378.
doi: 10.3724/SP.J.1146.2005.00523
Abstract:
The Immune Algorithm (IA) is proposed with analogies to the concept and the theory of immunity in life science. It inherits the advantages of Genetic Algorithm (GA) and avoids the deterioration-phenomenon. Spatial matrix describes the probabilities t...
The Immune Algorithm (IA) is proposed with analogies to the concept and the theory of immunity in life science. It inherits the advantages of Genetic Algorithm (GA) and avoids the deterioration-phenomenon. Spatial matrix describes the probabilities t...
2007, 29(2): 379-382.
doi: 10.3724/SP.J.1146.2005.00824
Abstract:
Ratio Of Exponentially Weighted Averages (ROEWA )operator is an edge detector suitable for SAR images. However, the detector can not compute the direction of edges accurately. Due to the excellent directional selectivity of Gabor filters, this paper ...
Ratio Of Exponentially Weighted Averages (ROEWA )operator is an edge detector suitable for SAR images. However, the detector can not compute the direction of edges accurately. Due to the excellent directional selectivity of Gabor filters, this paper ...
2007, 29(2): 383-386.
doi: 10.3724/SP.J.1146.2005.00932
Abstract:
The paper concerns the error analysis of image geometric distortion correction for missile-borne side-looking SAR. Because of the decrease of altitude during SAR operation, the SAR image obtained by common used imaging algorithm is seriously distorte...
The paper concerns the error analysis of image geometric distortion correction for missile-borne side-looking SAR. Because of the decrease of altitude during SAR operation, the SAR image obtained by common used imaging algorithm is seriously distorte...
2007, 29(2): 387-390.
doi: 10.3724/SP.J.1146.2005.00859
Abstract:
The beam of meter-wave radar is rather board, the exist of multi-path signals coherent with the direct arrival signal will cause badly affect to the altitude measurement, so it is more difficult for meter-wave radar to measure the altitude of the tar...
The beam of meter-wave radar is rather board, the exist of multi-path signals coherent with the direct arrival signal will cause badly affect to the altitude measurement, so it is more difficult for meter-wave radar to measure the altitude of the tar...
2007, 29(2): 391-396.
doi: 10.3724/SP.J.1146.2005.00814
Abstract:
This paper investigates the parallel processing of spaceborne ScanSAR in detail. Firstly, it analyzes the character of ScanSAR imaging and gives the parallel processing flow based on the traditional Host-Slave (HS) mode. Then, a new parallel technolo...
This paper investigates the parallel processing of spaceborne ScanSAR in detail. Firstly, it analyzes the character of ScanSAR imaging and gives the parallel processing flow based on the traditional Host-Slave (HS) mode. Then, a new parallel technolo...
2007, 29(2): 397-400.
doi: 10.3724/SP.J.1146.2005.00766
Abstract:
A novel approach of Ground Moving Target Indication (GMTI) based on subaperture is proposed in this paper. In this approach, the aperture of an antenna is divided into two subapertures. When the radar is in operation, the two subapertures pass the sa...
A novel approach of Ground Moving Target Indication (GMTI) based on subaperture is proposed in this paper. In this approach, the aperture of an antenna is divided into two subapertures. When the radar is in operation, the two subapertures pass the sa...
2007, 29(2): 401-404.
doi: 10.3724/SP.J.1146.2005.00738
Abstract:
Ship ISAR imaging is studied in the paper based on the airborne SAR real data. SAR imaging deals with static targets. A moving ship appears blurred in the SAR image. For the purpose of getting high resolution ship images, ISAR imagery may be introduc...
Ship ISAR imaging is studied in the paper based on the airborne SAR real data. SAR imaging deals with static targets. A moving ship appears blurred in the SAR image. For the purpose of getting high resolution ship images, ISAR imagery may be introduc...
2007, 29(2): 405-409.
doi: 10.3724/SP.J.1146.2005.00827
Abstract:
Firstly, a Bistatic Synthetic Aperture Sonar (Bi-SAS) configuration with fixed transmitter is given in this paper, and then the azimuth and range resolution, the Pulse Repetition Frequency (PRF) and the mapping rate of the Bistatic-SAS are studied in...
Firstly, a Bistatic Synthetic Aperture Sonar (Bi-SAS) configuration with fixed transmitter is given in this paper, and then the azimuth and range resolution, the Pulse Repetition Frequency (PRF) and the mapping rate of the Bistatic-SAS are studied in...
2007, 29(2): 410-413.
doi: 10.3724/SP.J.1146.2005.00818
Abstract:
This paper introduces a new adaptive filtering algorithm under the -stable noise conditions, which is obtained by minimizing the weighted average p-norm of error function. Two new versions of momentum LMP algorithm can be derived from the proposed on...
This paper introduces a new adaptive filtering algorithm under the -stable noise conditions, which is obtained by minimizing the weighted average p-norm of error function. Two new versions of momentum LMP algorithm can be derived from the proposed on...
2007, 29(2): 414-417.
doi: 10.3724/SP.J.1146.2005.00873
Abstract:
A method for joint estimating frequency, elevation, bearing and range of near-field narrowband sources is presented. The method uses eigenvalues together with the corresponding eigenvectors and four-order cumulant to estimate 4-D parameters of source...
A method for joint estimating frequency, elevation, bearing and range of near-field narrowband sources is presented. The method uses eigenvalues together with the corresponding eigenvectors and four-order cumulant to estimate 4-D parameters of source...
2007, 29(2): 418-420.
doi: 10.3724/SP.J.1146.2005.00834
Abstract:
A fast recursive algorithm is proposed in this paper for the realization of Discrete Cosine Transforms (DCT) with arbitrary length jointly using Clenshaw recurrence formula and the symmetry of DCT. Compared with other exiting recursive algorithms and...
A fast recursive algorithm is proposed in this paper for the realization of Discrete Cosine Transforms (DCT) with arbitrary length jointly using Clenshaw recurrence formula and the symmetry of DCT. Compared with other exiting recursive algorithms and...
2007, 29(2): 421-424.
doi: 10.3724/SP.J.1146.2005.00826
Abstract:
The ridgelet transform is a new directional multi-resolution transform，which is more suitable for describing signals with high dimensional singularities. Finite ridgelet transform is a discrete version of ridgelet transform, which is as numerically p...
The ridgelet transform is a new directional multi-resolution transform，which is more suitable for describing signals with high dimensional singularities. Finite ridgelet transform is a discrete version of ridgelet transform, which is as numerically p...
2007, 29(2): 425-428.
doi: 10.3724/SP.J.1146.2005.00901
Abstract:
A new matching metricalignment metric of feature points is defined, and a new approach to image registration based on alignment metric of feature points is proposed. Feature points and their angles are detected by using wavelet multi-scale product, t...
A new matching metricalignment metric of feature points is defined, and a new approach to image registration based on alignment metric of feature points is proposed. Feature points and their angles are detected by using wavelet multi-scale product, t...
2007, 29(2): 429-433.
doi: 10.3724/SP.J.1146.2005.00910
Abstract:
A very low bit rate speech encoding algorithm in 600bps is proposed in this paper for application in anti-jamming communication. Super-frame structure with 2 base frames and 4 interpolate frames is used, the LPC coefficients of interpolate frames is ...
A very low bit rate speech encoding algorithm in 600bps is proposed in this paper for application in anti-jamming communication. Super-frame structure with 2 base frames and 4 interpolate frames is used, the LPC coefficients of interpolate frames is ...
2007, 29(2): 434-438.
doi: 10.3724/SP.J.1146.2005.00899
Abstract:
To protect the privacy during the real-time speech communication, in this paper, a novel fast modification method for real-time speech is presented, in which the transformation method of Pseudo Log Area Ratio (PLAR) curve and Pitch-Synchronous-OverLa...
To protect the privacy during the real-time speech communication, in this paper, a novel fast modification method for real-time speech is presented, in which the transformation method of Pseudo Log Area Ratio (PLAR) curve and Pitch-Synchronous-OverLa...
2007, 29(2): 439-442.
doi: 10.3724/SP.J.1146.2005.00865
Abstract:
This paper addresses the problem of single-channel speech enhancement using spectral subtraction method. The proposed approach is directed toward combining modified a priori SNR based spectral subtraction algorithm with iterative spectral subtraction...
This paper addresses the problem of single-channel speech enhancement using spectral subtraction method. The proposed approach is directed toward combining modified a priori SNR based spectral subtraction algorithm with iterative spectral subtraction...
2007, 29(2): 443-446.
doi: 10.3724/SP.J.1146.2005.00566
Abstract:
Based on mulitsensor single model dynamic systems, a state fusion estimation algorithm is presented. Multisensors observe the same target, where different sensors may have different sampling rates and the ratio between them may be positive rational n...
Based on mulitsensor single model dynamic systems, a state fusion estimation algorithm is presented. Multisensors observe the same target, where different sensors may have different sampling rates and the ratio between them may be positive rational n...
2007, 29(2): 447-450.
doi: 10.3724/SP.J.1146.2005.00757
Abstract:
To develop an effective digital media protection method, an algorithm for digital video watermarking is proposed based on binary operation in 3D wavelet transform domain. For realizing the extraction of watermark image, a blind detection and restorat...
To develop an effective digital media protection method, an algorithm for digital video watermarking is proposed based on binary operation in 3D wavelet transform domain. For realizing the extraction of watermark image, a blind detection and restorat...
2007, 29(2): 451-454.
doi: 10.3724/SP.J.1146.2005.00746
Abstract:
An iterative factorization method based on linear subspace for projective reconstruction is presented in the paper. It relies on the facts that the rows in the matrix including all the image points span the same linear subspace as the rows in the mat...
An iterative factorization method based on linear subspace for projective reconstruction is presented in the paper. It relies on the facts that the rows in the matrix including all the image points span the same linear subspace as the rows in the mat...
2007, 29(2): 455-459.
doi: 10.3724/SP.J.1146.2005.00790
Abstract:
In this paper, a new distance called person-similarity weighted distance is proposed for person-independent facial expression recognition. In the new method, expression features associated with all persons in training set are extracted by Higher-Orde...
In this paper, a new distance called person-similarity weighted distance is proposed for person-independent facial expression recognition. In the new method, expression features associated with all persons in training set are extracted by Higher-Orde...
2007, 29(2): 460-464.
doi: 10.3724/SP.J.1146.2006.00196
Abstract:
In order to segment the moving objects accurately, an edge based moving objects segmentation algorithm is proposed in this paper. First of all, the initial edge model of the moving object is obtained on the basis of the adaptive change detection meth...
In order to segment the moving objects accurately, an edge based moving objects segmentation algorithm is proposed in this paper. First of all, the initial edge model of the moving object is obtained on the basis of the adaptive change detection meth...
2007, 29(2): 465-468.
doi: 10.3724/SP.J.1146.2005.00963
Abstract:
Based on the feature distance of generalized dimension, a speech endpoint detection method is proposed in order to detect the noisy-corrupted speech efficiently. Through calculating the generalized dimension by covering the signal with n-dimension bo...
Based on the feature distance of generalized dimension, a speech endpoint detection method is proposed in order to detect the noisy-corrupted speech efficiently. Through calculating the generalized dimension by covering the signal with n-dimension bo...
2007, 29(2): 469-472.
doi: 10.3724/SP.J.1146.2005.00749
Abstract:
There is a basic choice in the form of covariance matrix to be used with Gaussian mixture model in text-independent speaker identification. In general, diagonal covariance matrix is chose, which implies strong assumption that elements of the feature ...
There is a basic choice in the form of covariance matrix to be used with Gaussian mixture model in text-independent speaker identification. In general, diagonal covariance matrix is chose, which implies strong assumption that elements of the feature ...
2007, 29(2): 473-477.
doi: 10.3724/SP.J.1146.2005.00915
Abstract:
In the research of spatial hearing and implementation of virtual auditory space, it is important to accurately model the latent acoustical clues in HRTFs(Head-Related Transfer Functions) or HRIRs(Head-Related Impulse Responses) related to certain pos...
In the research of spatial hearing and implementation of virtual auditory space, it is important to accurately model the latent acoustical clues in HRTFs(Head-Related Transfer Functions) or HRIRs(Head-Related Impulse Responses) related to certain pos...
2007, 29(2): 478-481.
doi: 10.3724/SP.J.1146.2005.00913
Abstract:
This paper presents the all-phase filter design methods based on two kinds of symmetric frequency sampling. Under the condition of no window and single window, it is proved that the all-phase transfer curves designed by conventional symmetry frequenc...
This paper presents the all-phase filter design methods based on two kinds of symmetric frequency sampling. Under the condition of no window and single window, it is proved that the all-phase transfer curves designed by conventional symmetry frequenc...
2007, 29(2): 482-485.
doi: 10.3724/SP.J.1146.2005.00821
Abstract:
To investigate the problem of classical analytical method, which can not be used at Low-Grazing Angle (LGA) for rough surface scattering, a new high-order analytical method based on the high-order series expansion of the two-dimensional electric fiel...
To investigate the problem of classical analytical method, which can not be used at Low-Grazing Angle (LGA) for rough surface scattering, a new high-order analytical method based on the high-order series expansion of the two-dimensional electric fiel...
2007, 29(2): 486-488.
doi: 10.3724/SP.J.1146.2006.00134
Abstract:
The dihedral corner reflector with wing and fuselage joint of aircraft is a very strong electromagnetic source in a wide angular range. But traditional RCS computation method is only suit for the ideal dihedral corner reflector. This paper adopts Geo...
The dihedral corner reflector with wing and fuselage joint of aircraft is a very strong electromagnetic source in a wide angular range. But traditional RCS computation method is only suit for the ideal dihedral corner reflector. This paper adopts Geo...
2007, 29(2): 489-491.
doi: 10.3724/SP.J.1146.2005.00629
Abstract:
The principal objective of the present work is to investigate the statistic properties of SAR return signals. The Synthetic Aperture Radar (SAR) return signals from 3-dimensional Gauss random rough conducting surfaces is efficiently and accurately co...
The principal objective of the present work is to investigate the statistic properties of SAR return signals. The Synthetic Aperture Radar (SAR) return signals from 3-dimensional Gauss random rough conducting surfaces is efficiently and accurately co...
2007, 29(2): 492-495.
doi: 10.3724/SP.J.1146.2006.00028
Abstract:
In this paper, the finite radial thickness tape helix is replaced by the same thickness vacuum layer laid in an infinite thin tape helix. The effect of position of the infinite thin helix on the dispersion and coupling impedance is studied by field a...
In this paper, the finite radial thickness tape helix is replaced by the same thickness vacuum layer laid in an infinite thin tape helix. The effect of position of the infinite thin helix on the dispersion and coupling impedance is studied by field a...
2007, 29(2): 496-498.
doi: 10.3724/SP.J.1146.2005.00755
Abstract:
The shapes of real defect outline usually play an extremely important role in the yield prediction and inductive fault analysis of Integrated Circuits (IC). In this paper, the multifractal characterizations of real defect outlines are discussed, and ...
The shapes of real defect outline usually play an extremely important role in the yield prediction and inductive fault analysis of Integrated Circuits (IC). In this paper, the multifractal characterizations of real defect outlines are discussed, and ...
2007, 29(2): 506-508.
doi: 10.3724/SP.J.1146.2005.00627
Abstract:
In this paper, the resonance of fractal Frequency Selective Surfaces(FSS) is studied in particular. Because fractals contain several scales of the starting geometry and each of them resonant at a scaled frequency of the original one, the dualband and...
In this paper, the resonance of fractal Frequency Selective Surfaces(FSS) is studied in particular. Because fractals contain several scales of the starting geometry and each of them resonant at a scaled frequency of the original one, the dualband and...
2007, 29(2): 499-505.
doi: 10.3724/SP.J.1146.2005.01199
Abstract:
Super-Resolution (SR) reconstruction is to estimate High-Resolution (HR) images from Low-Resolution (LR) image sequence, which has been a great focus for compressed video. This paper firstly presents the base of SR reconstruction for compressed video...
Super-Resolution (SR) reconstruction is to estimate High-Resolution (HR) images from Low-Resolution (LR) image sequence, which has been a great focus for compressed video. This paper firstly presents the base of SR reconstruction for compressed video...
