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2000 Vol. 22, No. 2
Display Method:
2000, 22(2): 177-182.
Abstract:
This paper proposes a hybrid error control scheme suitable for wireless ATM systems, that is, voice telephone is protected by pure RS code, video and data are protected by truncated RS/Type II hybrid ARQ protocol. The performance of this hybrid error...
This paper proposes a hybrid error control scheme suitable for wireless ATM systems, that is, voice telephone is protected by pure RS code, video and data are protected by truncated RS/Type II hybrid ARQ protocol. The performance of this hybrid error...
2000, 22(2): 183-187.
Abstract:
Wavelet analysis has being gradually applied to communications, especially, wavelet modulation receives much considerations for its bandwidth efficiency. This paper discusses how to design optimal orthogonal wavelet and scaling functions which are ge...
Wavelet analysis has being gradually applied to communications, especially, wavelet modulation receives much considerations for its bandwidth efficiency. This paper discusses how to design optimal orthogonal wavelet and scaling functions which are ge...
2000, 22(2): 188-193.
Abstract:
A new dynamic code allocation CDMA (DCDMA) protocol,which can support voice and data services simultaneously,is investigated in this paper. In DCDMA protocol, a voice terminal will reserve a spreading code only in talkspurt. The base station assigns ...
A new dynamic code allocation CDMA (DCDMA) protocol,which can support voice and data services simultaneously,is investigated in this paper. In DCDMA protocol, a voice terminal will reserve a spreading code only in talkspurt. The base station assigns ...
2000, 22(2): 194-197.
Abstract:
A key escrow cryptosystem can provide protection for user s privacy, while at the same time, allows for the wiretapping when lawfully authorized. In this paper, a key escrow system based on RSA algorithm for network environment is given. A trusted ce...
A key escrow cryptosystem can provide protection for user s privacy, while at the same time, allows for the wiretapping when lawfully authorized. In this paper, a key escrow system based on RSA algorithm for network environment is given. A trusted ce...
2000, 22(2): 198-204.
Abstract:
This paper is based on the concept system for D=2 SM array code proposed by the author in 1994. The coding rule and existence condition for D = 3 SM array code are given, and its structure property, construction step, design analysis and some use are...
This paper is based on the concept system for D=2 SM array code proposed by the author in 1994. The coding rule and existence condition for D = 3 SM array code are given, and its structure property, construction step, design analysis and some use are...
2000, 22(2): 205-209.
Abstract:
A enumerative formula of Boolean functions with the first-order correlation-immunity, which are important in stream ciphers, is given with help of column-balance matrixes, inclusion-exclusioin principle in combinatorics and edge-induced subgraphs in ...
A enumerative formula of Boolean functions with the first-order correlation-immunity, which are important in stream ciphers, is given with help of column-balance matrixes, inclusion-exclusioin principle in combinatorics and edge-induced subgraphs in ...
2000, 22(2): 210-217.
Abstract:
In this paper, a new method based the fuzzy pattern recognition and fuzzy cluster techniques for the evaluation of communication equipment/system is proposed. Contrast with fuzzy comprehensive evaluation, the new method is effective for practical app...
In this paper, a new method based the fuzzy pattern recognition and fuzzy cluster techniques for the evaluation of communication equipment/system is proposed. Contrast with fuzzy comprehensive evaluation, the new method is effective for practical app...
2000, 22(2): 218-225.
Abstract:
The detected features evolution in scale-space is an important problem in multiscale analysis. With the 2-D Gaussian function as the kernel, the detected edge of an acute corner in scale-space, that is an ellipse determined by the slope of the corner...
The detected features evolution in scale-space is an important problem in multiscale analysis. With the 2-D Gaussian function as the kernel, the detected edge of an acute corner in scale-space, that is an ellipse determined by the slope of the corner...
2000, 22(2): 226-232.
Abstract:
A general difficulty of using singular value decomposition (SVD) to split signal and noise subspaces is in the right choice of effective rank. The commonly used method toward this end is to use a fixed threshold. Yet despite its apparent physical sig...
A general difficulty of using singular value decomposition (SVD) to split signal and noise subspaces is in the right choice of effective rank. The commonly used method toward this end is to use a fixed threshold. Yet despite its apparent physical sig...
2000, 22(2): 233-239.
Abstract:
To meet the requirements with large-scale neural networks for real-world applications, an inverse way of constructing objective functions was proposed in this paper, which translates the task of constructing objective functions into the design of err...
To meet the requirements with large-scale neural networks for real-world applications, an inverse way of constructing objective functions was proposed in this paper, which translates the task of constructing objective functions into the design of err...
2000, 22(2): 240-246.
Abstract:
A new blind beamformer with improved Hopfield network is presented in this paper. To estimate the steering vector, the signal property of cyclostationary is used. To suppress interference, traditional LCMV beamforming is employed. To improve the robu...
A new blind beamformer with improved Hopfield network is presented in this paper. To estimate the steering vector, the signal property of cyclostationary is used. To suppress interference, traditional LCMV beamforming is employed. To improve the robu...
2000, 22(2): 247-252.
Abstract:
Based on the scale and the state of intensity distribution in some neighborhoods of edge points, this paper proposes a measure vector of importance of point that consists of 4 components and corresponds to every point. For considering the background ...
Based on the scale and the state of intensity distribution in some neighborhoods of edge points, this paper proposes a measure vector of importance of point that consists of 4 components and corresponds to every point. For considering the background ...
2000, 22(2): 253-259.
Abstract:
This paper analyses further global asympototic stability of a class of delayed cellular neural networks by means of Lyapunov functional method and new inequality a2b(2a3+b3)/3, (a,b0) analysis technique, and some new sufficient criteria are obtained....
This paper analyses further global asympototic stability of a class of delayed cellular neural networks by means of Lyapunov functional method and new inequality a2b(2a3+b3)/3, (a,b0) analysis technique, and some new sufficient criteria are obtained....
2000, 22(2): 260-264.
Abstract:
This paper presents a high-resolution DOA tracking algorithm based on phased array with a single channel receiver. It is an improved algorithm of the method using specific weights to realize high-resolution direction finding with single channel recei...
This paper presents a high-resolution DOA tracking algorithm based on phased array with a single channel receiver. It is an improved algorithm of the method using specific weights to realize high-resolution direction finding with single channel recei...
2000, 22(2): 265-273.
Abstract:
After translational motion compensation, rotational motion compensation is needed in ISAR technique. This paper considers the rotational motion compensation in the case of that the target moves along a straight trajectory with constant speed. It is f...
After translational motion compensation, rotational motion compensation is needed in ISAR technique. This paper considers the rotational motion compensation in the case of that the target moves along a straight trajectory with constant speed. It is f...
2000, 22(2): 274-278.
Abstract:
The echo signal of a high-range-resolution radar(HRR) contains much information about target. By using this information and feature extraction method fully and properly, an efficient target recognition can be executed. A novel approach for radar targ...
The echo signal of a high-range-resolution radar(HRR) contains much information about target. By using this information and feature extraction method fully and properly, an efficient target recognition can be executed. A novel approach for radar targ...
2000, 22(2): 279-289.
Abstract:
Phase compensation is a critical step of Synthetic Aperture Radar(SAR) and Inverse Synthetic Aperture Radar(ISAR) imaging technique. This paper proposes a progressive approach algorithm based on image cost function to compensate the random phase erro...
Phase compensation is a critical step of Synthetic Aperture Radar(SAR) and Inverse Synthetic Aperture Radar(ISAR) imaging technique. This paper proposes a progressive approach algorithm based on image cost function to compensate the random phase erro...
2000, 22(2): 290-295.
Abstract:
Multi-fractal methods are introduced to radar clutters analysis in this paper to find general characteristics of clutters. Clutters and echoes from targets are analyzed respectively. The results show that the radar clutters are a kind of generalized ...
Multi-fractal methods are introduced to radar clutters analysis in this paper to find general characteristics of clutters. Clutters and echoes from targets are analyzed respectively. The results show that the radar clutters are a kind of generalized ...
2000, 22(2): 296-302.
Abstract:
This paper studies on the false color synthetic processing for polarimetric SAR data. A new method to get false color image of polarimetric SAR data with the unitary Stokes matrix is presented. Because this method discards the information of total po...
This paper studies on the false color synthetic processing for polarimetric SAR data. A new method to get false color image of polarimetric SAR data with the unitary Stokes matrix is presented. Because this method discards the information of total po...
2000, 22(2): 303-309.
Abstract:
A method of signal extraction in time domain is proposed in this paper, by means of which, the time-domain incident wave and reflected wave on the reference plane of the feeder can be extracted from the total-field responses obtained from the time-do...
A method of signal extraction in time domain is proposed in this paper, by means of which, the time-domain incident wave and reflected wave on the reference plane of the feeder can be extracted from the total-field responses obtained from the time-do...
2000, 22(2): 310-315.
Abstract:
The spectral techniques is mainly used in the analysis of digital circuits. This paper studies its application in the synthesis of digital circuits. In this paper, the spectral function is realized by using bidirectional current-mode CMOS circuits, a...
The spectral techniques is mainly used in the analysis of digital circuits. This paper studies its application in the synthesis of digital circuits. In this paper, the spectral function is realized by using bidirectional current-mode CMOS circuits, a...
2000, 22(2): 331-335.
Abstract:
A new smart antenna for CDMA system was proposed in the paper. The beam pattern with approximately equal side lobe is adopted. The weighting vectors are got not by measuring or rectifying in advance, they can be got by average method, and can be real...
A new smart antenna for CDMA system was proposed in the paper. The beam pattern with approximately equal side lobe is adopted. The weighting vectors are got not by measuring or rectifying in advance, they can be got by average method, and can be real...
2000, 22(2): 336-340.
Abstract:
In this paper, a new approach based on genetic algorithm (GA) is applied to adaptive array, in according to the limitation of hardware, the amplitude weights are not changed, but the phase weights are optimized globally with genetic algorithm. For re...
In this paper, a new approach based on genetic algorithm (GA) is applied to adaptive array, in according to the limitation of hardware, the amplitude weights are not changed, but the phase weights are optimized globally with genetic algorithm. For re...
2000, 22(2): 341-345.
Abstract:
To study the influence of rough sea surface on the space field of HF ground wave radar on coast, a derivation of the reflection is introduced first, which is suitable for rough sea surface with Gaussian distribution of heights, and then the reflectio...
To study the influence of rough sea surface on the space field of HF ground wave radar on coast, a derivation of the reflection is introduced first, which is suitable for rough sea surface with Gaussian distribution of heights, and then the reflectio...
2000, 22(2): 346-349.
Abstract:
This paper introduces the construction of the ultra-high speed waveform digitized system based on laser probe. The functions of different stages of the high-speed dynamic divider circuit chip are measured with the double-frequency phase sweeping tech...
This paper introduces the construction of the ultra-high speed waveform digitized system based on laser probe. The functions of different stages of the high-speed dynamic divider circuit chip are measured with the double-frequency phase sweeping tech...
2000, 22(2): 316-324.
Abstract:
In DS/CDMA communication system, users share time and frequency resourses, it will cause Multiple Access Interference (MAI). The conventional detector follows a single-user detection strategy can not reject MAI. In this paper many important technolog...
In DS/CDMA communication system, users share time and frequency resourses, it will cause Multiple Access Interference (MAI). The conventional detector follows a single-user detection strategy can not reject MAI. In this paper many important technolog...
2000, 22(2): 325-330.
Abstract:
This paper systematically summarizes the merits, defects and perspectives of the neural network approaches being able to solve the physical design tasks, analyzes the present research situation of applying neural networks to physical design, proposes...
This paper systematically summarizes the merits, defects and perspectives of the neural network approaches being able to solve the physical design tasks, analyzes the present research situation of applying neural networks to physical design, proposes...
