最新刊期
卷 ， 期 1 ， 1995
- 摘要：Discrete Fourier Transform in finite fields has a wide range of applications,especially in digital signal processing,coding and cryptology.The conventional DFT in finite fields exists only for blocklength which is co-prime with the characteristics of the fields,so it can not be used to process the data with any other blocklengths.In this paper,a new DFT of arbitrary blocklength in finite fields is proposed,and the related properties of the new DFT are investigated,its applications in cryptology and coding are also discussed.关键词：DFT;Transform technology;signal processing;Coding and Cryptology2|132|0更新时间：2025-12-08
- 摘要：Statistical multiplexing can be used to gain higher bandwidth efficiency,but it’s important to properly control the input traffic to avoid severe network congestion.The leaky bucket algorithm has been proposed as an important method in the rate-based traffic control in ATM networks.We derive the leaky bucket algorithm for bursty sources in ATM networks and obtain the analytical expression of the relation among the leaky bucket performance,the leaky bucket parameter and the statistical parameters of input traffic.The results of computer simulation show its concordance with the theoretical analysis.关键词：Leaky bucket algorithm;Bursty traffic;traffic control2|139|18更新时间：2025-12-08
- 摘要：In this paper,the security problem of the encryption procedures in the public key cryptosystems ECPSZ and ECPS3 which are based on error correcting codes is discussed.It is pointed out that a permuation matrix can be found in time O（n3） from the public information of the cryptosystems,which can be used to decrypt the ciphertexts encrypted with the secret permutation matrix,where n is the mumber of rows（columns） in the secret permutaion matrix.Further,detailed procedure to attack ECPS2 is described.关键词：Public key cryptosystem;digital signature;error-correcting code;cryptanalysis2|25|0更新时间：2025-12-08
- 摘要：In this paper,a new decision feedback blind equalization cost function is introduced,which is strictly a convex function with respect to tap weight vector of forward equalizer,vector of the feedback equalizer and the error probability of system. Its global convergence is guaranteed by using gradient algorithm.For a typical channel input with 16QAM sequence,our scheme has proved to have low comoputational complexity and fast convergence rate.关键词：Cost function;Error probability;Convex function;blind equalization2|30|3更新时间：2025-12-08
- 摘要：Together with differential signals,utilizing self-learning blind signal separation,the blind separation of time delay narrow band signals is realized. The results of computer simulation are also presented.关键词：signal separation;Self-learning neural network;array signal processing2|83|23更新时间：2025-12-08
- 摘要：The paper presents a new topology of small-sized high-frequency DC/DC converters.From analysis of its operation,restrictions of the topology and calculational method of main electrical parameters are derived.关键词：Clamped mode;Zero voltage switch;Converter;Topology2|72|2更新时间：2025-12-08
- 摘要：The characteristics of the new software system including 32 methods of modern spectral analysis and so on are discussed.Then the advanced design principles of this software system are described,and the advanced features of the PC spectral analyzer constructed by use of this software system are pointed out. Finally some application examples are given.关键词：Modern spectral analysis;Software system;Graphic processing;Signal analysis;PC spectral analyzer2|90|1更新时间：2025-12-08
- 摘要：The intra-faults and the inter-faults of the units are modeled by Markov processes and Renewal processes respectively,and the size of the packet loss in these faults models is used as performability evaluation standard for internetworks.The relative formulas are derived and a way to increase reliability and performability for internetworks is presented.关键词：Internetworks;Reliability and Performability;Markov processes;Renewal processes.2|51|0更新时间：2025-12-08
- 摘要：A non-orthogonal DCT,the DC3T,is proved to have equal residual correlation as and higher transform gain over the well-known DCT,its entropy and energy compression properties along with its computations are provided.关键词：DCT;Gain of transform coding;Fast transform;Image data compression2|29|0更新时间：2025-12-08
- 摘要：So far many fruitful results have been obtained for equilibrium characterization of the continuous Hopfield model.In this paper we show that most of them can be extended to the Bidirectional Associative Memory（BAM） model through a special arrangement of its connection weights.Stressed issues are equilibrium conditions,asymptotic stability and regions of attraction of stable equilibrium points,which have important significance in the design of BAM.关键词：ANN;Continuous BAM;Equilibrium condition;stability4|60|11更新时间：2025-12-08
- 摘要：In this paper,an augmented neural network for solving linear and quadratic programming problems is given.It is shown that the new network system is globally convergent to a solution to the problem.The network is capable of achieving the exact solution and solving both the primal problem and dual problem simultaneoursly.关键词：Neural metwork;linear programming;quadratic programming;Dual problem2|122|6更新时间：2025-12-08
- 摘要：The Travelling Salesman problem（TSP） is studied using Hopfield neural network（HNN） in this paper.A new algorithm is proposed by simplifying energy function,and the feasibility of the algorithm is analyzed.The analysis is based on the geometry of the subspace set up by the degenerated eigenvalues of the connection matrix.A large number of simulation results show that the algorithm has the advantage of avoiding most local energy minima with the optimum or near-optimum solution and fast speed of convergence.关键词：Hopfield neural network（HNN）;Travelling salesman problem（TSP）;Local and global minimum3|840|91更新时间：2025-12-08
- 摘要：In this paper,the OS-CFAR detector is studied in Weibull background and its performance for an homogeneous clutter background is analyzed.For Weibull background with unknown shape parameter C the estimation method with censoring function is proposed based on expectation value and median of random variables from a reference window.In addition,the performance of this estimation method is disccussed in an homogeneous clutter background.The results show that the estimation algorithm possesses very small additive CFAR losses.For N=16,C=2 and k=12,the CFAR losses of the algorithm are much smaller than those of the two parameter OS-CFAR.关键词：radar;detection;CFAR;Clutter;Order statistics2|471|53更新时间：2025-12-08
- 摘要：Scan-beam synthetic aperture radar（SCANSAR） is proposed to solve the problem that SAR is constrained to a narrow swath by ambiguity limitation.This paper mainly engaged in SCANSAR imaging.SCANSAR operation principle,signal structure,signal parameters and data format are studied carefully befor imaging processing is taken into consideration.Signal processing includes the block data imaging algorithm and the subimages mosaicing algorithm.In block data imaging,two kinds of azimuth algorithms,spectrum analysis algorithm and time domain-frequency domain hybird algorithm,are discussed.In subimages mosaicing,time relation is utilized to clip the subimages and combine them sequentially.Computer simulation,which includes reformatting SEASAT raw data to SCANSAR data,processing block data and combining the subimages to a whole image,verifies the proposed signal format and imaging algorithm.关键词：Image radar;Scan-beam SAR;Wide swath SAR2|189|3更新时间：2025-12-08
- 摘要：In research of image sequence analysis by using successive two image plane and two steps method one can not obtain accurate motion parameters.In this paper we use arbitrary of image frames and iterative extended Kalman filter approach to estimate object motion parameters.Simulated results show that recursive algorithm is convergent and result data are effective on condition that initial values are suitable.关键词：图像序列分析;运动．迭代扩展卡尔曼滤波2|326|5更新时间：2025-12-08
- 摘要：This paper presents a location and tracking algorithm based on target’s distance difference between two measurements and the azimuth message.The location principle of thismethod is analysed in detail.The performance of the algorithm is evaluated with the help of computer simulation for typical target paths.关键词：定位跟踪;斜距;方位角;辐射源2|163|17更新时间：2025-12-08
- 摘要：This paper presents a morphological algorithm for texture feature extraction and compare it with two other morphology-based algorithms.Experimental results show that our texture features are the most efficient for texture image classification.关键词：texture feature;texture classification;mathematical morphology;image analysis2|180|15更新时间：2025-12-08
- 摘要：In this paper,we suggest using widrow-Hoff LMS method for SAR parameter estimation.Two supervised classifiication experiments and two unsupervised segmentation experiments have been carried out to examine the performance of the LMS estimation scheme.The classification accuracy rates of our experiments are 91% and 100% respectively.In our segmentation experiments,the texture boundries are accurately detected.关键词：SAR model;adaptive algorithm;texture classification;texture segmentation2|147|5更新时间：2025-12-08
- 摘要：This paper proposes a new non-adaptive quasioptimal approach to temporal-spa-tial 2-D signal processing:filtrating clutter spectrum by rotating.The clutter spectrum over theplan of temporal-spatial 2-D spectrum can be rotated to be a verticall line band and then can be filtrated.Conipared with other approaches published,its performance of the signal detection is more optimal and the real-time processing is easy to be realized.关键词：Temporal-spatial 2-D signal processing;Filtrating clutter2|86|7更新时间：2025-12-08
- 摘要：This paper,which is based on the synthetic idea,analyzes the decomposition of morphological structuring element.For any N point structuring element,it gives out that the correct lower bound of decomposition is e.In N,and then we propose the essential and necessary condition for the optimal decomposition of the morphological structuring element.关键词：mathematical morphology;Structuring element decomposition3|46|2更新时间：2025-12-08
- 摘要：This paper analyzes the misadjustment noise introduced by the momentum factor α for traditional BP algorithm,and points out that it is not neglected to effect converget precision of the algorithm.At the same time,an improved algorithm with stochastic attenuation momentum factor is presented.关键词：Misadjustmetn Noise;neural network;BP algorithm2|198|62更新时间：2025-12-08
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