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1998 Vol. 20, No. 3
Display Method:
1998, 20(3): 289-295.
Abstract:
In this paper, an adaptive multiresolution speech enhancement algorithm based on wavelet transform is put forward. It can make adaptive filtering to noise speech both at scales and among scales. So that the noise parts during the frequency intervals ...
In this paper, an adaptive multiresolution speech enhancement algorithm based on wavelet transform is put forward. It can make adaptive filtering to noise speech both at scales and among scales. So that the noise parts during the frequency intervals ...
1998, 20(3): 296-301.
Abstract:
In this paper, A decoupled parameter estimation(DPE) algorithm for estimating parameters of the harmonic-group signal in colored noise is researched. In this algorithm, a iterated harmonic-group clean algorithm is presented to obtain the estimates of...
In this paper, A decoupled parameter estimation(DPE) algorithm for estimating parameters of the harmonic-group signal in colored noise is researched. In this algorithm, a iterated harmonic-group clean algorithm is presented to obtain the estimates of...
1998, 20(3): 302-307.
Abstract:
An algorithm for simultaneous estimation of two dimentional angle and polarization of multiple signals is proposed in this paper. Using an L-shaped array consisting of crossed dipoles, the algorithm exploits rotational invariance properties involved ...
An algorithm for simultaneous estimation of two dimentional angle and polarization of multiple signals is proposed in this paper. Using an L-shaped array consisting of crossed dipoles, the algorithm exploits rotational invariance properties involved ...
1998, 20(3): 308-314.
Abstract:
A multiscale analysis method for precisely estimating the time of arrival (TOA) of radar return is proposed in this paper. Through synthetically analyzing the characteristics of echoes in different scales, our method not only can detect the radar ret...
A multiscale analysis method for precisely estimating the time of arrival (TOA) of radar return is proposed in this paper. Through synthetically analyzing the characteristics of echoes in different scales, our method not only can detect the radar ret...
1998, 20(3): 315-320.
Abstract:
A novel scheme of motion estimation for video sequences, spatial-temporal correlated multiresolution algorithm, is proposed in this paper. This algorithm employs the correlation presented in motion vector field, including spatial-temporal correlation...
A novel scheme of motion estimation for video sequences, spatial-temporal correlated multiresolution algorithm, is proposed in this paper. This algorithm employs the correlation presented in motion vector field, including spatial-temporal correlation...
1998, 20(3): 321-329.
Abstract:
Based on analysis of the stop and go decision-directed (DD) algorithm, a method of selecting (3 is proposed, which guarantees the quick convergent characteristic of the stop and go DD algorithm. In order to improve the convergent speed of stop and go...
Based on analysis of the stop and go decision-directed (DD) algorithm, a method of selecting (3 is proposed, which guarantees the quick convergent characteristic of the stop and go DD algorithm. In order to improve the convergent speed of stop and go...
1998, 20(3): 330-335.
Abstract:
Estimating the arrival time of overlapping echoes by high resolution array processinh algorithms can efficiently expand the ability of target resolution in radar.Lowering the SNR trhreshold at which the algorithms take effect has particularly been an...
Estimating the arrival time of overlapping echoes by high resolution array processinh algorithms can efficiently expand the ability of target resolution in radar.Lowering the SNR trhreshold at which the algorithms take effect has particularly been an...
1998, 20(3): 336-341.
Abstract:
A family of binary QF sequences are constructed and their periods, size of the family, correlation functions and linear span are given, which shows that Cmax= qn/2+1+1,Lmax= m(3n/2)m-1 when n is even, Cmax= qn/2+3/2+1,Lmax= 2m-1mnm-1 when n is odd.
A family of binary QF sequences are constructed and their periods, size of the family, correlation functions and linear span are given, which shows that Cmax= qn/2+1+1,Lmax= m(3n/2)m-1 when n is even, Cmax= qn/2+3/2+1,Lmax= 2m-1mnm-1 when n is odd.
1998, 20(3): 342-351.
Abstract:
For both the periodic case and aperiodic case, the relations between the run numbers of a binary sequence and autocorrelation, cross-correlation functions of sequences are investigated.And the correlation functions expressed by the runs of a binary s...
For both the periodic case and aperiodic case, the relations between the run numbers of a binary sequence and autocorrelation, cross-correlation functions of sequences are investigated.And the correlation functions expressed by the runs of a binary s...
1998, 20(3): 352-357.
Abstract:
This paper proposes a new media-access protocol for multichannel ring networks. The protocol adopts reservation schemes and provides each node with two channels. The mathematical analysis and computer simulation show that the protocol has good proper...
This paper proposes a new media-access protocol for multichannel ring networks. The protocol adopts reservation schemes and provides each node with two channels. The mathematical analysis and computer simulation show that the protocol has good proper...
1998, 20(3): 358-362.
Abstract:
It is important to design survivability for a broadband communication network. Network survivability is affected by many factors including routing. The effect of splitting factors of diverse routing is analyzed and the particular advantages of the ev...
It is important to design survivability for a broadband communication network. Network survivability is affected by many factors including routing. The effect of splitting factors of diverse routing is analyzed and the particular advantages of the ev...
1998, 20(3): 363-368.
Abstract:
In mmW radar system, SNR affect heavily on radar range. To lower the SNR demand of target recognition, a new approach of feature extraction based on the bispectrum technique is presented. The feature vectors defined from bispectrum have high stabilit...
In mmW radar system, SNR affect heavily on radar range. To lower the SNR demand of target recognition, a new approach of feature extraction based on the bispectrum technique is presented. The feature vectors defined from bispectrum have high stabilit...
1998, 20(3): 369-373.
Abstract:
A method finding the global optimum value of misalignment is presented.It is used to increase the accuracy of range alignment.There exist the drift and jump erros when use the classical amplitude correlation method to aling the envelope of the echoes...
A method finding the global optimum value of misalignment is presented.It is used to increase the accuracy of range alignment.There exist the drift and jump erros when use the classical amplitude correlation method to aling the envelope of the echoes...
1998, 20(3): 374-378.
Abstract:
This paper,at first ,expounds the relation between the singular singal and the modular maximum for wavelet transform,and the different features of singal and noise in wavelet transform.Then,in the light of high-resolution radar target one dimensional...
This paper,at first ,expounds the relation between the singular singal and the modular maximum for wavelet transform,and the different features of singal and noise in wavelet transform.Then,in the light of high-resolution radar target one dimensional...
1998, 20(3): 379-385.
Abstract:
This paper studies on the speckle reduction in multi-look polarimetric SAR image.A novel method,named the multi-look polarimetric whitening filtering (WPMF) method,is presented,and is further extended to construct a fully polarimetric filter with mul...
This paper studies on the speckle reduction in multi-look polarimetric SAR image.A novel method,named the multi-look polarimetric whitening filtering (WPMF) method,is presented,and is further extended to construct a fully polarimetric filter with mul...
1998, 20(3): 386-391.
Abstract:
In this paper,the temporary high resolution radar target range profile sequences were used to identify aircraft targets, and a real time recurrent neural network classification method was proposed based on range profile sequences.The experiments of c...
In this paper,the temporary high resolution radar target range profile sequences were used to identify aircraft targets, and a real time recurrent neural network classification method was proposed based on range profile sequences.The experiments of c...
1998, 20(3): 392-396.
Abstract:
Some probles about SAR moving targets imaging by joint time-frequency analysis are discussed in this paper.Three kinds of time-frequency transforms--Short Time Fourior Transform(STFT),Wavelet Transform(WT) and Wigner-Ville Distribution (WVD) are comp...
Some probles about SAR moving targets imaging by joint time-frequency analysis are discussed in this paper.Three kinds of time-frequency transforms--Short Time Fourior Transform(STFT),Wavelet Transform(WT) and Wigner-Ville Distribution (WVD) are comp...
1998, 20(3): 397-403.
Abstract:
A novel complex FIR filter design approach based on Neural Network Optimiza-tion(NNO) technique is proposed in this paper. To demonstrate the feasibility of the NNO design approach, the weight least mean square criterion between the disired frequency...
A novel complex FIR filter design approach based on Neural Network Optimiza-tion(NNO) technique is proposed in this paper. To demonstrate the feasibility of the NNO design approach, the weight least mean square criterion between the disired frequency...
1998, 20(3): 404-408.
Abstract:
It is very hard to solve the packing problem especially for the three dimensional packing problem. A new evolution strategy is presented in this paper which combines heuristic experience with genetic algerithms, its evalutionary thought is common to ...
It is very hard to solve the packing problem especially for the three dimensional packing problem. A new evolution strategy is presented in this paper which combines heuristic experience with genetic algerithms, its evalutionary thought is common to ...
1998, 20(3): 409-412.
Abstract:
When performing RCS measurements for outdoor targets, usually the whole space range under measurement is greatly longer than the actual target zone, which causes very large data storage and makes further data processing difficulty. To solve this prob...
When performing RCS measurements for outdoor targets, usually the whole space range under measurement is greatly longer than the actual target zone, which causes very large data storage and makes further data processing difficulty. To solve this prob...
1998, 20(3): 413-416.
Abstract:
A fast direction-of-arrival(DOA) estimation algorithm is proposed that applies to coherent wide-band emitter signals impinging on an uniform linear array.This algorithm,where spatial smoothing technique is employed,is based on obtaining the array mai...
A fast direction-of-arrival(DOA) estimation algorithm is proposed that applies to coherent wide-band emitter signals impinging on an uniform linear array.This algorithm,where spatial smoothing technique is employed,is based on obtaining the array mai...
1998, 20(3): 417-420.
Abstract:
This paper provides array signal processing super-resolution fast algorithm. This algorithm based on the eigenvalue value shift of covariance matrix and its power iteration. It does not needs the inverse matrix. It converges quickly and only needs se...
This paper provides array signal processing super-resolution fast algorithm. This algorithm based on the eigenvalue value shift of covariance matrix and its power iteration. It does not needs the inverse matrix. It converges quickly and only needs se...
1998, 20(3): 421-424.
Abstract:
In this paper, the performances of ATM switch architectures based on different buffer strategies and some switch design technologies which can improve switching performance under uniform traffic mode are studied and compared with that of nonuniform t...
In this paper, the performances of ATM switch architectures based on different buffer strategies and some switch design technologies which can improve switching performance under uniform traffic mode are studied and compared with that of nonuniform t...
1998, 20(3): 425-428.
Abstract:
The Perfectly Matched Layer(PML)is very effective in absorbing propagating wave, so that it has been successfully applied in FDTD research. Katz(1994) derived 12 differential equations in three-dimensional PML, but there is no conclusion for the prop...
The Perfectly Matched Layer(PML)is very effective in absorbing propagating wave, so that it has been successfully applied in FDTD research. Katz(1994) derived 12 differential equations in three-dimensional PML, but there is no conclusion for the prop...
1998, 20(3): 429-432.
Abstract:
The device structure and technical processings of quasi-planar self-aligned silicon avalanche electron emission array are introduced. The processing step at the edge of electron emission region is about 100 nm only and the width of self-aligned curre...
The device structure and technical processings of quasi-planar self-aligned silicon avalanche electron emission array are introduced. The processing step at the edge of electron emission region is about 100 nm only and the width of self-aligned curre...
