最新刊期
卷 ， 期 7 ， 1996
- 摘要：This paper presents a multicriterion optimization aglorithm for the NMR spectrum data imaging. According fuzziness of quality of digitial image,we propose a set of fuzzy exponential functions as objective functions.These functions can transfer multiobjective problem in spatial to in frequency domain by math treating, and derive a fast and efficient imaging algorithm.关键词：Image fuzzy set;Fuzzy exponential functions;Multicriterion optimization;Image reconstruction2|58|6更新时间：2025-12-08
- 摘要：The research and development on SAM are described. Four parts are included in the THSAM-7 type SAM: acoustic lens:mechanics; electronic circuits and microcomputer system.Operation principle of SAM are discussed. The application of SAM in some industrial fields are given.All of these facts show:it is a effective tool for examing welding; interior imaging of opaque specimen. Lastly, the image processing related with SAM is presented.关键词：Acoustic microscope;Acoustic imaging;image processing2|82|1更新时间：2025-12-08
- 摘要：The constellation design for a low earth orbit （LEO） mobile satellite communication system （MSCS）is a basic problem in a non-geostationary satellite communication system.The coverage problem for China is considered emphatiacally.This paper proposes a constellation scheme of LEO and new optimun algorithms for orbital parameter selection to obtain maximum communication coverage rate.The statistical results have shown that the coverage rate for China using this constellation （24 satellites） is better than that of Globalstar system（24 satellites too）.关键词：LEO mobile satellite communication;Constellation design;Optiumn algorithmns;Coverage analysis.4|571|44更新时间：2025-12-08
- 摘要：A direct-sequence spread-spectrum multiple-access communication mode based on residue number system is presented. The approximation for the multiuser probability of error are obtained by characteristic function method when the channel noise is a combination of additive white Gaussian noise （AWGN）and multiple-access interference.The numeric results show the comparisions of the performance of the proposed system in this paper and the system proposed by P.K.Enge.关键词：Residue number system;Direct-sequence spread-spectrum;Orthogonal codes;Error-control2|73|4更新时间：2025-12-08
- 摘要：A novel approach is presented for performanec analysis of shared buffer ATM switching.It provides a new means to solve problems in more complex queueing system.It is a accurate algorithm by employing an one-step transition probability matrix of the Markov chain. Exactitude and effectiveness are verified by computer simulation.关键词：performance analysis;ATM switching;Queueing algorithm2|23|1更新时间：2025-12-08
- 摘要：Based on the modified least median of squares （LMedS）regression,a robust approach of motion estimation from the space position vectors of 3-D feature points is put forward.First initial estimation is obtained by the primary LMedS,then we re-estimate motion parameters with an iterated reweighted estimator, in which a hybrid weight function of Huber weight and Tukey weight takes place of the dichotomy weight in the primary LMedS.This algorithm alleviates the difficulty of deleting some outliers while SNR is too low,so can get better accuracy of estimation. Computer simulations show that its performance is satisfactory.关键词：robust;Least median of squares;Weighted estimation of motion parameters;Outliers2|288|7更新时间：2025-12-08
- 摘要：多输出端Ⅱ型电流传送器ＴｈｅＳｅｃｏｎｄＧｅｎｅｒａｔｉｏｎＣｕｒｒｅｎｔＣｏｎｖｅｙｏｒｗｉｔｈＭａｎｙＯｕｔｐｕｔＴｅｒｍｉｎａｌｓ袁助国，杨志民（西北师大物理系，兰州７３００７０）第二代或Ⅱ型电流传送器（ＣＣⅡ）只有一个输出端，当用其构成二阶以...2|29|0更新时间：2025-12-08
- 摘要：When the SMI algotithm is used in ADBF,the convergence rate of beam pattern can be sped up by diagonal loading.In this paper,we give the proper loading level which is determined by some physical parameters.Both SINR and beam pattern can be rapidly converged with proper loading when strong interferences are impinged on sidelobe.Simulation results are given,which verify the theoretical predictions.关键词：Adaptive digital beamformming （ADBF）;SMI algorithm;Diagonal loading;Convergence of beam pattern4|203|20更新时间：2025-12-08
- 摘要：Spatial differencing technique is presented for direction finding in the presence of coherent sources with a uniform linear array.This method fully utilizes the Toeplitz and non-Toeplitz parts of the correlation matrix of received signals.A common algorithm can find the directions of uncorrelated and correlated sources.The spatial differencing algorithm can obtain the directions of correlated and coherent sources. In addition ,more sources can be estimated with fewer sensors. And further the spatial differencing technique is supported by the simulations.关键词：direction finding;Spatial smoothing technique;Spatial differencing technique2|178|24更新时间：2025-12-08
- 摘要：In this paper,we proposed a new simple algorithm to solve the inverse problem of IFS interpolated signals,which got some very promising results when used to recover such signals from additive,amplitude uniformly distributed white noises.The algorithm can not only be used to separate fractal component from noise,but also as a new tool to model signals with IFS interpolation, or to calculate the complexity of a given fractal interpolation signal and mutual information between its samples.关键词：IFS;fractal interpolation;inverse problem2|120|9更新时间：2025-12-08
- 摘要：To deal with the robustness of shape desciption,this paper proposes the high order morphological pattern spectrum which relies upon the difference between two different sized alternating sequential morphological transformations on the original image.It is proved that the higher order components of HP spectrum for a noisy image are exactly identical to these for the noise-free image under certain conditions.Also,the results of the experiments have been shown that the HP spectrum shows the strongest robustness.关键词：shape description;shape recognition;Morphological pattern spectrum2|42|4更新时间：2025-12-08
- 摘要：Based on analysis about neural networks’ information storing principle,the concept and principle of higher-order generalized neural networks are proposed,of which a typical intelligent neuron model and the characteristics of corresponding higher-order generalized neural networks are disscussed and also compared with standard BP algorithm.关键词：neural networks;model;learning algorithm;BP algorithm;Multi-layer perceptron2|142|26更新时间：2025-12-08
- 摘要：In this paper,we propose a new data association algorithm based on neural-fuzzy fusion networks,to solve the problems in the practical application of multitarget data association in clutter. Firstly,we present a system structure for the fast multi target data association ,which results in realizing the data association in series and reducing the fuzziness of association.Secondly,we apply the neural-fuzzy fusion technology and the modified fuzzy basic function networks in the computing of correlation.Finally,the results of its application in the Ground Wave Over-The-Horizon Radar prove that this fast algorithm,have improved the performances of the multitarget data association in the rough sea clutter.关键词：Neural-fuzzy fusion networks;data association;multitarget tracking2|264|21更新时间：2025-12-08
- 摘要：Several types of spline multiresolution analyses are constructed systematically simply based on the general decomposition theory of two-scale shift-invariant subspaces.The only involved operations are convolution,inversion, squar-root,subsumpling and inner product of sequenses.关键词：Spline;wavelet;wavelet packet;multiresolution analysis2|97|12更新时间：2025-12-08
- 摘要：This paper principally discusses the training problem of Gaussian basis function classifier which can be used for classification. For basis function classifier,how to correctly initialize the number of network hidden nodes and their parameters is very important. Genetic-based Gaussian function clustering method and fuzzy decision technique are explored to complete this work. Then by using back propagation learning algorithm,the final training can be achieved. Results from the typical experiments are used to illustrate the power and efficiency of this method.关键词：neural network;classifier;Gaussian function;clustering;Fuzzy decision;Back propagation2|127|6更新时间：2025-12-08
- 摘要：To separate the EEG measured on the scalp into the parts generated by deep and shallow dipole sources respectively is a subject of great significance both theoretically and clinically. Based on the analysis of the spatial frequency of EEG, a method is proposed in this paper to solve this problem in two steps.For the first step,the shallow dipoles are localized by the higher spatial frequency components and for this purpose, a frequency domain Marquardt algorithm is derived.Then,in the second step, the electrical activities contributed by the deep dipoles are revealed after substraction of the potentials generated by shallow dipoles from the measured EEG. Computer simulations show that the shallow sources can be localized accurately by inversion in the frequency domain with higher frequency components and the potentials generated by deep and shallow dipoles can be separated effectively.关键词：EEG;Spatial frequency of EEG;Dipole localization;Inversion in frequency domain2|46|4更新时间：2025-12-08
- 摘要：A feedback neural network with Hebbian’s learning rule which used to realize blind separation of wide-band signals for near-field situations was described. Then the convergence of algorithm and the stability of equilibrium states were discussed. Finally computer simulations were also presented.关键词：blind signal separation;neural network;signal processing2|211|143更新时间：2025-12-08
- 摘要：In this paper,a new extrapolation method of band-limited signal is presented.This method acquires the advantage of toleramce to noise,and the computational complexity is lower.After proving the convergence of the algorithm,error estimation and some results of computer experiment are presented.关键词：Signal reconstruction;signal extrapolation;regularization method;Regularization parameter;error estimation2|66|1更新时间：2025-12-08
- 摘要：This paper studies frequency planning of terrestrial digital HDTV and presents an approximate calculating method of HDTV service area.We elaborate the key technology that must be solved in two HDTV transmission system schemes.A design principle of a concatenated code in HDTV is proposed. System structure of HDTV is also discussed. At last we propose some reference opinions for developing digital HDTV of our country.关键词：HDTV;Frequency planning;COFDM;Concatenated code;TCM2|35|2更新时间：2025-12-08
- 摘要：A new DFT fast algorithm of the multidimension signal is presented in this paper.Because it transfrom multidimension signal DFT into many groups of one dimension odd frequency DFT, the number of the total operation depends mainly on one dimension odd frequency FFT algorithm.It has better regularity structure and can operate in-place.Under two dimension,compared with polynomial transform, both is the same when data are real;the new algorithm is somewhat better than Reference[6] in number of add operation when data are complex. The number of the total operation of 3-D and 4-D is also given.关键词：fast algorithm;Number of operation;polynomial;DFT2|60|0更新时间：2025-12-08
- 摘要：A new algorithm which is called pseudo-sequential decoding of block codes is presented,whose complexity is reduced by employing of branching and bounding strategy for a binary directed tree.The new decoder can complete soft-decision decoding without hard-decision decoding,it is simpler in structure than the Chase decoder.The computer simulation shows that the performance of the new decoder approaches to that of the Viterbi decoder and superior to over that of the Chase Ⅱ decoder.关键词：soft-decision decoding;Sequentiel decoding;Binary directed tree2|107|2更新时间：2025-12-08
- 摘要：ＡＶＩＤ技术公司新闻发布爱维德技术公司北亚区技术研讨及新闻发布会于９６年６月１０，１１日在北京香格里拉饭店举行。这是北亚区举办的大型巡回展的第三站。这是在９６年ＮＡＢ之后ＡＶＩＤ北亚区举办的一次大型技术交流活动，将一些最新的技术成果介绍给中国的广播电...2|13|0更新时间：2025-12-08
- 摘要：The combination of error-correction with spread-spectrum is one of the important means to improve the performance of CDMA system,however, while coding gain is obtained,processing gain will decrease.In this paper,we discuss the coordination and trade-off between processing gain and coding gain when convolution code is applied to spread-spectrum CDMA system on condition that the total system bandwidth and information rate are fixed.关键词：CDMA;Convolution coded;Processing gain;coding gain2|158|3更新时间：2025-12-08
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Study on Performance Bounds of RS Coded Hybrid DS-SFH Spread Spectrum Multiple Access Communications
摘要：The upper bounds on the performance of RS coded hybrid DS-SFH SSMA systems with noncoherent DPSK and FSK modulation over Rician and Rayleigh multipath channels have been developed.An RS decoding algorithm using the channel informance about the presence or absence of the multipath interference and multiple access interference is also investigated.关键词：Spread Spectrum Multiple Access;Correcting error coder;digital communications2|41|3更新时间：2025-12-08 - 摘要：In this paper,a feedback neural network,of which input elements are nonlinearly connected, is studied. The topology of its second order case is shown,the learning rules which make shift pattern recognition possible are derived. With the help of the idea of the equivalent weight subset,not only the shift pattern invariance conditions are coded in weight matrix but the nonlinearly connected network is made much simpler.关键词：artificial neural network;pattern recognition;translation invariance;Learning rule2|32|0更新时间：2025-12-08
- 摘要：A new method for the design of spatial filters having flat response based on the semi-infinite optimization techniques is presented.The method is to minimize the array noise power subject to the linear functional inequality constraints ,which ensure the flat response of the spatial filters in the interest of spatial sector. Because of the hard constraints,the response of the spatial filters can be controlled in the allowable errors.Finally,we study the flat-based estimation of direction-of-arrival of signals.Computer simulation results and analyses show the advantages of the proposed method over the other related methods.关键词：optimization;Spatial filter;Direction-of-arrival estimation4|57|0更新时间：2025-12-08
- 摘要：华中理工大学图像识别与人工智能研究所ＩｎｓｔｉｔｕｔｅｏｆＰａｔｔｅｒｎＲｅｃｏｇｎｉｔｉｏｎａｎｄＡｒｔｉｆｉｃａｌＩｎｔｅｌｌｉｇｅｎｃｅＨｕａｚｈｏｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ华中理工大学座落在江城武汉美...2|143|0更新时间：2025-12-08
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