Email alert
1998 Vol. 20, No. 2
Display Method:
1998, 20(2): 145-150.
Abstract:
By use of the approach of complex random signal processing, the asymptotic statistical properties of the least square estimates of 2-D exponential signals are studied. In doing so it is found that the representation is considerably more intuitive, an...
By use of the approach of complex random signal processing, the asymptotic statistical properties of the least square estimates of 2-D exponential signals are studied. In doing so it is found that the representation is considerably more intuitive, an...
1998, 20(2): 151-156.
Abstract:
In this paper, the shortages of WVD s double-linearity in extracting the Doppler parameters of moving-targets are discussed, especially in multi-point moving-targets imaging processing based on the spectrum characteristics of moving-target echo signa...
In this paper, the shortages of WVD s double-linearity in extracting the Doppler parameters of moving-targets are discussed, especially in multi-point moving-targets imaging processing based on the spectrum characteristics of moving-target echo signa...
1998, 20(2): 157-165.
Abstract:
The frequency spectrum characteristics of SAR data link signals were derived. By means of two dimensional spectrum of SAR data link signal,the effects of the amplitude-frequency distortion and phase-frequency distortion in SAR data link system on SAR...
The frequency spectrum characteristics of SAR data link signals were derived. By means of two dimensional spectrum of SAR data link signal,the effects of the amplitude-frequency distortion and phase-frequency distortion in SAR data link system on SAR...
1998, 20(2): 166-174.
Abstract:
Continuous wavelet transforms (CWT) have lots of applications in the field of signal processing due to its unique characteristics. Their realization, however, request considerable computation. Therefore, a fast algorithm is provided to combat this co...
Continuous wavelet transforms (CWT) have lots of applications in the field of signal processing due to its unique characteristics. Their realization, however, request considerable computation. Therefore, a fast algorithm is provided to combat this co...
1998, 20(2): 175-181.
Abstract:
Based on the whitening property of wavelet transformation for 1/f noise, the problem of detecting deterministic signals in the presence of 1/f fractal noise is addressed. The transfer function of whitening filter is provided, the receiver structure b...
Based on the whitening property of wavelet transformation for 1/f noise, the problem of detecting deterministic signals in the presence of 1/f fractal noise is addressed. The transfer function of whitening filter is provided, the receiver structure b...
1998, 20(2): 182-187.
Abstract:
A cone-kernel time-frequency representation using adaptive scheme over both time and frequency is presented. For adapting to the analysed signal, the time-frequency representation uses varying cone length in each time-frequency point. It yields bette...
A cone-kernel time-frequency representation using adaptive scheme over both time and frequency is presented. For adapting to the analysed signal, the time-frequency representation uses varying cone length in each time-frequency point. It yields bette...
1998, 20(2): 188-193.
Abstract:
Conventional template matching technique is a successfully used algorithm in Chinese consonant recognition, yet its disadvantage limits its recovery of error,improvement of performance. The hybrid system based on the combination of neural network(NN)...
Conventional template matching technique is a successfully used algorithm in Chinese consonant recognition, yet its disadvantage limits its recovery of error,improvement of performance. The hybrid system based on the combination of neural network(NN)...
1998, 20(2): 194-198.
Abstract:
It is one of the tasks of Chinese speech understanding system that translates Chinese syllable from Chinese speech recognition system into a correct Chinese character, word, and phrase, sentence, and it will implement the task of speech to text altog...
It is one of the tasks of Chinese speech understanding system that translates Chinese syllable from Chinese speech recognition system into a correct Chinese character, word, and phrase, sentence, and it will implement the task of speech to text altog...
1998, 20(2): 199-205.
Abstract:
In this paper, on the basis of analysing and comparing the characteristics of En-In noise of in-phase and inverting amplifiers,new results are presented. The methods in this paper are highly important for us to design a low-noise circuit consisting o...
In this paper, on the basis of analysing and comparing the characteristics of En-In noise of in-phase and inverting amplifiers,new results are presented. The methods in this paper are highly important for us to design a low-noise circuit consisting o...
1998, 20(2): 206-212.
Abstract:
The approaches to model the real defect outlines in the IC manufacturing process are compared and some useful conclusions are obtained. The results obtained in this paper will be helpful for yield prediction and fault analysis of IC.
The approaches to model the real defect outlines in the IC manufacturing process are compared and some useful conclusions are obtained. The results obtained in this paper will be helpful for yield prediction and fault analysis of IC.
1998, 20(2): 213-218.
Abstract:
The characteristics of fully integrated filters would deviate from the desired values in the presence of parasitic poles. The effects of the finite DC gain and non-dominant poles of the integrators on filter perfomance are analyzed, deviation fomulas...
The characteristics of fully integrated filters would deviate from the desired values in the presence of parasitic poles. The effects of the finite DC gain and non-dominant poles of the integrators on filter perfomance are analyzed, deviation fomulas...
1998, 20(2): 219-222.
Abstract:
By discussing linear structures of Boolean functions, a large class of the first order correlation-immune nonlinear structure functions is got; After enumerating this class of functions, a new lower bound of the number of the first order correlation-...
By discussing linear structures of Boolean functions, a large class of the first order correlation-immune nonlinear structure functions is got; After enumerating this class of functions, a new lower bound of the number of the first order correlation-...
1998, 20(2): 223-228.
Abstract:
In this paper, the frequency diversity reception of multi-carrier CDMA signal is studied. The performance of multi-carrier CDMA system under perfect carrier recovery and frequency selective Rayleigh fading channel condition is analyzed. A smoothing a...
In this paper, the frequency diversity reception of multi-carrier CDMA signal is studied. The performance of multi-carrier CDMA system under perfect carrier recovery and frequency selective Rayleigh fading channel condition is analyzed. A smoothing a...
1998, 20(2): 229-234.
Abstract:
In CDMA mobile communication systems, multiple access interference can be cancelled by multiuser detection technique. The degradation by channel fading can be reduced by diversity reception. This paper investigates a family of multiuser receivers tha...
In CDMA mobile communication systems, multiple access interference can be cancelled by multiuser detection technique. The degradation by channel fading can be reduced by diversity reception. This paper investigates a family of multiuser receivers tha...
1998, 20(2): 235-240.
Abstract:
A new spreading sequences generator based on a class of chaotic maps is proposed. The theoretical performances of such sequences are shown to be good using the ergodic theory of chaos. The practical performances are then found by computer simulation....
A new spreading sequences generator based on a class of chaotic maps is proposed. The theoretical performances of such sequences are shown to be good using the ergodic theory of chaos. The practical performances are then found by computer simulation....
1998, 20(2): 241-246.
Abstract:
In this paper, the method of signal flow graphs is applied to path enumeration and deflection routing performance analysis in multihop networks. A Taylor series expansion of the transfer function yields the number of paths of a given length between t...
In this paper, the method of signal flow graphs is applied to path enumeration and deflection routing performance analysis in multihop networks. A Taylor series expansion of the transfer function yields the number of paths of a given length between t...
1998, 20(2): 247-250.
Abstract:
An explicit and stable time-domain method for solving the propagation of wave envelope in optical structures is proposed. Based on Dufort-Frankel method and variable change, it is a explicit difference. The method takes less memory and less time and ...
An explicit and stable time-domain method for solving the propagation of wave envelope in optical structures is proposed. Based on Dufort-Frankel method and variable change, it is a explicit difference. The method takes less memory and less time and ...
1998, 20(2): 251-256.
Abstract:
Ionospheric time delay is one of the largest error sources in C/A code GPS navigation and positioning. In this paper, a method is proposed for real-time dual-frequency ionospheric time-delay correcting using a C/A code GPS receiver, and the principle...
Ionospheric time delay is one of the largest error sources in C/A code GPS navigation and positioning. In this paper, a method is proposed for real-time dual-frequency ionospheric time-delay correcting using a C/A code GPS receiver, and the principle...
1998, 20(2): 257-262.
Abstract:
An alternative hybrid method which combines an extrapolation technique with the moment method (MM) for solving scattering problems involving large scatterers is presented. The Matrix Pencil (MP) method which is more robust to noise in the sampled dat...
An alternative hybrid method which combines an extrapolation technique with the moment method (MM) for solving scattering problems involving large scatterers is presented. The Matrix Pencil (MP) method which is more robust to noise in the sampled dat...
1998, 20(2): 263-266.
Abstract:
The eigenvalue equation of the helix-cylindrical waveguide system is derived and the complex roots of this system are obtained for the first time. The separation conditions among the real, imaginary and complex root modes are derived. A set of eigenv...
The eigenvalue equation of the helix-cylindrical waveguide system is derived and the complex roots of this system are obtained for the first time. The separation conditions among the real, imaginary and complex root modes are derived. A set of eigenv...
1998, 20(2): 267-272.
Abstract:
This paper describes a method about the design of the transition region of the electron beam from partially shielded cathode with uniform and periodic magnetic focusing field. It is necessary to use paraxial ray equation in non-equipotential space fo...
This paper describes a method about the design of the transition region of the electron beam from partially shielded cathode with uniform and periodic magnetic focusing field. It is necessary to use paraxial ray equation in non-equipotential space fo...
1998, 20(2): 273-276.
Abstract:
In this paper, the mathmetical description of signal coding based on MSDE and LMSDE model is given. The signal coding under LMSDE model is transformed into solving a quadratic programs with nonlinear constrains. Finally, the efficiency and robustness...
In this paper, the mathmetical description of signal coding based on MSDE and LMSDE model is given. The signal coding under LMSDE model is transformed into solving a quadratic programs with nonlinear constrains. Finally, the efficiency and robustness...
1998, 20(2): 277-280.
Abstract:
A quantitative analysis on the local precision and the ability against noise for image edge detection with wavelets (IEDW) has been done in this paper. With an appropriate wavelet function, IEDW algorithm is equal with a process that consists of two ...
A quantitative analysis on the local precision and the ability against noise for image edge detection with wavelets (IEDW) has been done in this paper. With an appropriate wavelet function, IEDW algorithm is equal with a process that consists of two ...
1998, 20(2): 281-284.
Abstract:
Field emission arrays are important to vacuum microelectronic microwave devices. The downward pyramid filled cone and upward etched silicon cone are fabricated. Two kinds of packing structures are used and the emission properties of these cones are t...
Field emission arrays are important to vacuum microelectronic microwave devices. The downward pyramid filled cone and upward etched silicon cone are fabricated. Two kinds of packing structures are used and the emission properties of these cones are t...
1998, 20(2): 285-288.
Abstract:
In this paper, a new type of microwave radiometer, real-time calibrated microwave radiometer was introduced. It has the following characteristics: (1) insensitive to system gain variations; (2)insensitive to receiver noise temperature variations; (3)...
In this paper, a new type of microwave radiometer, real-time calibrated microwave radiometer was introduced. It has the following characteristics: (1) insensitive to system gain variations; (2)insensitive to receiver noise temperature variations; (3)...
