Table of Content

20 June 2004 Volume 31 Issue 3

  

Original Articles

A time-domain equivalent edge current method applied to transient scattering analysis of a flat plate

GE De-biao;YANG Ling-xia;WEI Bing;TIAN Chun-ming

J4. 2004, 31(3):  329-333. 

Abstract ( 1811 )   Save

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The time-domain equivalent edge current(TD-EEC) method is derived from teh Fourier inversion of the frequency domain equivalent edge current expression and applied to the transient scattering analysis. The time-domain diffracted fields are expressed in terms of a contour integral along the edge for an arbitrary input pulse and angular coefficients, thereby yielding finite results at the caustics of diffracted rays. The results for a perfectly conducting flat plate computed by TD-EEC are compared with FDTD results for back scattering and RCS in a wide band. The two results are in excellent agreement while the multiple diffraction between edges is not included. The multiple diffraction evaluated by TD-EEC will be studied in the future.

Blind signal separation based on the partially independent component analysis

ZHANG Jun-ying1;2;LIU Li-ping1

J4. 2004, 31(3):  334-337. 

Abstract ( 1731 )   Save

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The Independent Component Analysis(ICA) is a recently developed method for multi-signal processing and Blind Source Separation(BSS). However, its constraint on the sources that the sources are statistically independent of each other greatly limits its applications to BSS since the sources in most applications are not guaranteed to be independent. This paper presents a partially independent component analysis(PICA) method for BSS of dependent sources, where the approximately independent indices of the sources are selected with some feature selection method, and ICA is performed on the selected indices of the observations. A large number of simulations and a real world DNA microarray data experiment show great availability and effectiveness of the method presented here.

A study of simulation and an analysis of a SiGe CMOS structure

DAI Xian-ying;HAO Dong-yan;ZHANG He-ming;HU Hui-yong;Lü Yi

J4. 2004, 31(3):  338-341. 

Abstract ( 1543 )   Save

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A novel SiGe CMOS stucture is proposed. MEDICI was used to simulate the relations between the electrical parameters of teh SiGe CMOS structure and its geometrical and physical parameters. According to the results of the MEDICI simulation, the effects of the main factors which include Ge contents in the strained and relaxed SiGe layes, and the thickness of Si cap layer on the electrical performance of the SiGe CMOS structure are discussed and analyzed. The transport performance of a SiGe CMOS inverter is simulated with MEDICI and the delay time is 3ps.

A uniform design based multi-objective adaptive genetic algorithm towards the evolutionary design of analog circuits

ZHAO Shu-guang1;JIAO Li-cheng1;WANG Yu-ping2;YANG Wan-hai1

J4. 2004, 31(3):  342-346. 

Abstract ( 2001 )   Save

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The Multi-Objective Adaptive Genetic Algorithm(MOAGA) proposed in this paper is aimed at the evolutionary design of circuits. It features a group of uniformly scattered search directions toward the Pareto frontier obtained by using the Uniform Design Technique(UDT), an efficient circuit representation scheme that enables circuit structures to be generated and improved automatically to get practical design results, a UDT based multi-parents multi-offspring crossover operator to improve the quality of population with a less computational cost, and an adaptation technique that enables genetic parameters P_c and P_m to track the evolution process and treat each type of loci respectively according to its effect on the fitness so as to increase search efficiency and global convergence possibility. Some experimental results presented show that the MOAGA is capable of searching out effecitve circuits in accordance with the required responses, while the computational cost can be largely decreased.

A disparity estimation algorithm for stereo image coding with an adaptive block matching

HAN Jun-gong;LU Zhao-yang

J4. 2004, 31(3):  347-351. 

Abstract ( 1569 )   Save

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This paper presents a novel disparity estimation algorithm with an adaptive window based on some references. Firstly, the image is divided into some fix-blocks. Then, its disparity vectors are estimated using these fix-blocks. Secondly, the intensity error between one block and its corresponding block is calculated to determine whether an adpative window is adopted. The variance of intensity error is used to control the shape and size of the matching window. Finally, the process of disparity estimation is resumed using this new matching window and the final disparity vector is obtained. Shown by experimetns, the veracity of this algorithm is better than the traditional fix-block algorithm, and the efficiency is higher than that of some adaptive-block matching algorithm used in stereo matching. So this algorithm is a simple and an applicable disparity estimation algorithm that is adaptive to the encoding system.

Desig of a 5V, 14-bit high speed digital-to-analog converter for telecommunication applications

ZHU Zhang-ming;YANG Yin-tang;CHAI Chang-chun;LIU Lian-xi;CHANG Yi-feng;WEN Liang

J4. 2004, 31(3):  352-356. 

Abstract ( 1531 )   Save

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A 5V, 14-bit high speed segmented current steering digital-to-analog converter(DAC) for telecommunication applications implemented in a 0.35μm, 5V SPTM TSMC CMOS process is described. A 5-4-5 thermometer coder, a new switch sequence and a swithc-current driver are described. Based on the TSMC 0.35μm mixed-signal CMOS technology, the DAC is simulated by teh Hspice. The DAC can deliver up to 20mA full-scale current into a 50Ω load. Power dissipation with a 5V supply and a full-scale 20mA is 270mW at a 125 MSPS clock rate. The INL of 14-bit DAC is ±1.5LSB, and DNL is ±0.75LSB. Spurious-Free Dynamic Range(SFDR) is 72dBc at a 125 MSPS clock rate and a 10MHz output frequency.

Fast analysis of a novel base station antenna with MoM based on AutoCAD modeling and PNM

ZHAI Hui-qing;ZHANG Yu;SU Tao;LIANG Chang-hong

J4. 2004, 31(3):  357-361. 

Abstract ( 1722 )   Save

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The dipole antenna array with a trough reflector is widely applied to base stations for mobile communications. The auto-modeling of the trough reflector is studied by AutoCAD firstly, and its surface meshes are obtained on the bais of many basic triangle patches. The data are further processed to make it convenient to get the electric characteristics of the base station antenna by MoM. Finally, the method of PNM is introduced to speed up the analysis of the radiation pattern of a new kind of base station antenna. Numerical results show the effectiveness and the accuracy of the analysis.

A study of the turbo product coded modulation based on differential detection

LIU Wei;ZHANG Hai-lin;LIU Zeng-ji

J4. 2004, 31(3):  362-366. 

Abstract ( 1324 )   Save

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Th turbo product coded modulation based on differential detection(DD-TPCM) is presented. The decoding of DD-TPCM does not need any channel state information in additive white Gaussian noise channels and flat Rayleigh-fading channels. The simulation resdults show that the DD-TPCM based on QDPSK, 8DPSK and 16DAPSK has no error floor in the flat fading channel with the fading factor of 0.03. The performance of DD-TPCM is better than that of trellis coded modulation in flat Rayleigh-fading channels.

Research progress of GaN-based microwave devices

YANG Yan;HAO Yue;ZHANG Jin-cheng;LI Pei-xian

J4. 2004, 31(3):  367-372. 

Abstract ( 1639 )   Save

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GaN-based microwave devices possess potential in microwave and high power applications, and related researches have been a hotspot in the current compound semiconductor area. A comparison and discussion of GaN's show its great advantages in microwave and high power application. The newest development of several GaN-based microwave devices is also introduced. The advantage of GaN Modulation Doped Field Effect Transistors(MODFETs) in microwave and high power applications is compared with that of other microwave devices finally.

The embedded control system of the Stewart platform

CHEN Guang-da;QIU Yuan-ying;MI Jian-wei;BAO Hong

J4. 2004, 31(3):  373-376. 

Abstract ( 1449 )   Save

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This paper introduces the composition, characteristics, development of the software platform and hardware platform of an embedded system, with emphasis on the ARM embedded micro-processor and μC/OS Real Time Operation System(RTOS). The application and realization method of the embedded system in mechatronic control are given with an example of the specially used servo controller for the Stewart Platform.

The NESSIE block ciphers and their security

WEI Bao-dian1;2;LIU Jing-wei1;WANG Xin-mei1

J4. 2004, 31(3):  377-382. 

Abstract ( 1749 )   Save

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The NESSIE project is a three-year project with the main objective to put forward a portfolio of strong cryptographic primitives of various types. We have forcused on the three block ciphers selected most recently. We study their mechanisms, performance and design principles and compare the security against the well-known cryptanalsis. It is pointed out that MISTY1 and Camellia are secure against the differential and linear cryptanalysis and can also withdraw the interpolation attacks, slide attacks and related-key attacks. But they can both be described with a set of multivariate quadratic or linear equations and this may form a potential algebraic weakness. The security analysis of SHACAL-2 will likely lead to a new methodology of cryptanalysis of block ciphers. We believe that the NESSIE project will help to promote the standardization of our own cryptographic primitives.

Research on jamming effecitveness measurement against SAR

WEI Qing;YANG Shao-quan;CHEN Jun-li;DONG Chun-xi

J4. 2004, 31(3):  383-387. 

Abstract ( 1958 )   Save

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The jamming theory against the Synthetic Aperture Radar is presented. The paper also studies the mathematical models of the SAR signal from extended features, the noise and jamming signal, which have been processed in two dimensionsl The definition of the contour line is discussed, which can measure the protected area in azimuth dimension. Based on the contour line plot, the operation procedure of the distributed jamming system against SAR is given. Finally, the results of computer simulation are applied to distributed jamming stations.

A fast algorithm for determining the k-error linear complexity profile of a q-ary sequence with a period pⁿ

BAI En-jian;TAN Shi-chong;XIAO Guo-zhen

J4. 2004, 31(3):  388-393. 

Abstract ( 1846 )   Save

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The k-error linear complexity of a periodic sequence is defined as the smallest linear complexity that can be obtained by changing k or fewer bits of the sequence per period. k-error linear complexity profile of a sequenes is the ordered list of k-error linear complexities. The index reveals how the linear complexity of the sequence varies as an increasing number of the bits of the sequence are changed. A fast algorithm is presented for determining k-error linear complexity profile of a q-ary sequence with a period pⁿ, where p, q is an odd prime and q is a primitive root modulo p². The algorithm generalizes both the Xiao, Wei, Lam, Imamura and Weik Dong, Xiao algorithms, which compute the linear complexity and k-error linear complexity of a q-ary sequence of a period pⁿ, respectively. The algorithm we present computes the k-error linear complexity profile for the q-ary sequence of a period pⁿ using at most Θ(2ⁿ⁺¹) steps.

Pseudo-randomness of a generalized self-shrinking sequences

DONG Li-hua;GAO Jun-tao;HU Yu-pu

J4. 2004, 31(3):  394-398. 

Abstract ( 1571 )   Save

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The pseudo-randomness of a class of generalized self-shrinking Sequences are analyzed. It is proved that the least period has 56 cases which reach the maximum(that is 2^n-1) among its 64 cases and it has a good low-degree-autocorrelation feature.

Blind source separation: classification and frontiers

LI Xiao-jun1;ZHU Xiao-long2;ZHANG Xian-da2

J4. 2004, 31(3):  399-404. 

Abstract ( 1900 )   Save

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By researching into the new development of BSS, this paper is dedicated to the classification of the BSS algorithms and the researching frame of BSS, together with getting the crucial optimal criteria of BSS, and introducing the contrast function theory, the local stability condition and the performance indices. Finally, the frontiers in the research of BSS are also presented.

On the construction of dynamic multi-threshold metering schemes

MA Wen-ping

J4. 2004, 31(3):  405-408. 

Abstract ( 1433 )   Save

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Metering Schemes are introduced by Naor and Pinkas, which are used to measure the interaction between clients and servers on the web during a certain number of time frames. In order to measure any number of visits in any granularity, the dynamic multi-threshold metering schemes are introduced by Carlo Blundo, Annalisa De Bonis, Barbara masucci and Douglas R.Stinson. In this paper, the construction of dynamic multi-threshold metering schemes is studied, a new construction of dynamic multi-threshold metering schemes is presented based on RS code, and a new dynamic multi-threshold scheme for unlimited use is given based on discrete logarithms.

Fast computation of the electrical characteristics of the normal mode helical antenna

ZHOU Bin;JI Yi-cai;GUO Jing-li;LIU Qi-zhong

J4. 2004, 31(3):  409-412. 

Abstract ( 1641 )   Save

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This paper investigates a new moment method for calculating the electrical characteristics of teh Normal Mode Helical Antenna(NMHA). The piecewise-straight segments are used to model the NMHA. The NMHA can be analyzed by the Moment Method with the Composite basis functions and the Composite testing functions. The rank of the impedance matrix can be reduced by using this method. Thereofre, the CPU time and the memory storage are significantly reduced in solving the matrix equation. The current distributions and radiation patterns of teh NMHA obtained by this method are compared with the NEC results, indicating that the two agree fairly well.

Finite element analysis for fuzzy truss structures based on information entropy

GAO Wei;CHEN Jian-jun;MA Juan;HU Tai-bin

J4. 2004, 31(3):  413-416. 

Abstract ( 1510 )   Save

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The analysis methods of the finite element for fuzzy truss structures udner fuzzy loads action are studied. Based on the information entropy, the fuzzy variables are transformed into radndom variables, in which the structural physical parameters and geometrical dimensions and applied loads are all considered as fuzzy variables. Based on the random factor method(RFM), the computational expressions for the mean value and mean variance of the structural displacement response and stress responses are developed by the algebra method. Through examples, the influences of the fuzziness of the structural physical parameters and geometric dimensions and loads on the structural displacement and stress responses are analyzed, and the rationality and feasibility of presented model and approach are validated.

On the sleeve monopole antennas located at the center of a circular dish

GUO Jing-li;HE Xiu-lian;LIU Qi-zhong

J4. 2004, 31(3):  417-421. 

Abstract ( 1662 )   Save

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A novel method is proposed for analyzing the sleeve monopole at the center of a circular ground plane. Using the moderately thick cylindrical model and sinusoidal interpolation basis function, the sleeve monopole at the circular ground plane is analyzed by the moment method. The input impedance and radiation pattern are given. Finally, a practical sleeve antenna, with the VSWR less than 3.0 in 225~515MHz frequency band, is designed according to the analysis above. he results show that the model used in this paper is more accurate and practical.

Study of a new dynamic fuzzy controller

QU Sheng-li1;ZHOU Feng-qi1;ZHOU De-yun2

J4. 2004, 31(3):  422-425. 

Abstract ( 1492 )   Save

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The structure of a new dynamic fuzzy controller is presented. The first-order dynamic fuzzy controller is studied with six corresponding fuzzy inference rules given. The results show that the performance of the control systems with the first-order dynamic fuzzy controller is much better than that with the traditional static fuzzy controller.

Computation of the closed-form spatial Green's function for the thick microstrip substrate by the two-level discrete complex image method

HE Xiu-lian;GONG Shu-xi;JI Yi-cai;LIU Qi-zhong

J4. 2004, 31(3):  426-430. 

Abstract ( 1464 )   Save

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Two-level discrete complex image method(DCIM) is used to compute the closed-form Green's functions efficiently. The generalized Pencil-of-Function method is employed to approximate the spectral domain Green's functions by a linear combination of exponential functions. With the Sommerfeld identity, the spatial domain closed-form Green's functions are obtained. In the two-level DCIM, the approximation is performed at two levels to reduce the time to fit the Green's functions with exponential functions so that the efficiency is improved. Numerical results show that the two-level DCIM is an efficient method for calculating the closed-form Green's Functions.

A data reduction algorithm based on the rough set theory and its improvement

MA Li1;2;JIAO Li-cheng1

J4. 2004, 31(3):  431-435. 

Abstract ( 1362 )   Save

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As a useful tool for Data Mining, the Rough Set Theory is widely used in the description of the correlation between attributes of relational database, the reduction of the attribute set, the counting of an attribute importance compared to other attribute importance, the discovery of rules, and so on. First, on the basis of analyzing the Rough Set Theory based on relational database, a more detailed description of attribute set reduction algorithm based on the core is given. Next, in order to reduce the computational complexity of the algorithm, the relationship conception, which describes the contribution of one of condition attributes to decision attribute, is put forward. It is applied to the algorithm above and the speed of the improved algorithm is raised. A brief comparison of the computation complexity of the old algorithm with the improved one is made. Finally, we test the improved algorithm with practical data. The result shows that the improved algorithm can not only reduce the computational complexity, but also gain the solution inferior to the best attribute reduction in most cases.

Study of adaptive interference cancellation in SIMO and MIMO sytems

HUANG Jian-feng;ZHANG Hai-lin

J4. 2004, 31(3):  436-441. 

Abstract ( 1677 )   Save

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This paper puts forwards a method for adaptive interference cancellation in SIMO and MIMO systems, which by generating a reference input without any parts of the signal, is able to avoid the damage of the signal in the system of interference cancellations. Firstly, deduction is taken theoreticaly. Then simulation is done. According to the results, the performance of the communication systems using this method is improved.

A new BLAST based on RAKE reception

WANG Feng1;LI Yong-zhao1;2;LIAO Gui-sheng1

J4. 2004, 31(3):  442-445. 

Abstract ( 2053 )   Save

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A new BLAST is proposed, which introduces orthogonal spreading sequences to the original system using the basic structure of BLAST. The receiver suppresses interferences from other antennas by the orthogonal information contained in the received signals. The information from the corresponding "layer" is extracted from every receive antenna by the RAKE receiver to form efficient statistic decision. Simulation results show that the performance achieved by teh proposed BLAST outperforms ZF-based BLAST and STBC in the case of a low SNR.

ARM detection and identification technique based on Radon-Ambiguity transform

ZHANG Hong-kuan;CHEN Jian-chun;YANG Wan-hai

J4. 2004, 31(3):  446-449. 

Abstract ( 1386 )   Save

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A new method for ARM detection and identification based on RAT(Radon-Ambiguity Transform) is proposed, by which no multichannel phase compensation preprocessing for missile acceleration is required. The detection of ARM signal is accomplished by one-dimensional searching and hence the computation is greatly reduced. Meanwhile the chirp rate identification is more accurate. Computer simulation shows that an accurate and reliable detection and identification of weak ARM signals can be achieved in the SNR environment as low as -10dB.

Phase-only filters for realizing transverse superresolution

DING Hong-ping;LI Qing-hui;ZOU Wen-yi

J4. 2004, 31(3):  450-453. 

Abstract ( 1365 )   Save

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For improving the transverse resolution, 3-zone phase-only filters are designed at the special Strehl ratio S, which is the ratio of the maximum intensity of the entral core of the superresolving pattern to the Airy pattern, and the special resolution parameter G, which is the ratio between the first minimum of the transverse intensity of the superresolving pattern and the unobstructed pattern. To suppress the strong sidelobe intensity, these phase-only filters are used in the confocal scanning microscopy syste with good resolving effects achieved.

Schnorr and ring signatures based on XTR

WANG Ji-lin;WU Qian-hong;GAO Hu-ming;WANG Yu-min

J4. 2004, 31(3):  454-458. 

Abstract ( 1391 )   Save

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This paper surveys the progress of the Ring Signature and presents an XTR-Ring Signature on the basis of our new XTR-Schnorr signature protocol. Our new XTR-Schnorr signature, with the same security and computational complexity as the known XTR-Nyber-RUEPPEL signature, has two advantages: 1. the length of our signature is shorter. 2. the block cipher algorithm is not needed. The XTR-Ring Signature algorithm is of less computational cost and a shorter length than Ring Signature schemes based on RSA or DL.

A method for solving ruin probability

ZHOU Yong1;LIU San-yang1;YANG Shu-guang2

J4. 2004, 31(3):  459-461. 

Abstract ( 1288 )   Save

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Four conceptions are proposed of "rigid enterprise", "flexible enterprise", "critical ruin probability" and "maximum tolerable loss". Moreover, based on the four conceptions, a new method is obtained for solving the ruin probability. Meanwhile, the reasons of bankruptcy are found out via mathematical ways. Some other results are achieved, for instance, the certain bankruptcy of enterprises in a finite time, the critical ruin probability of the enterprise and so on.

A multi-signcryption model and its application

ZHANG Jian-hong1;2;WANG Ji-lin1;WANG Yu-min1

J4. 2004, 31(3):  462-464. 

Abstract ( 1649 )   Save

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Signcryption is a new cryptographic technology, which simultaneously fulfills both the function of digital signature and public key encryption in a logically single step, and more efficient than the traditional "signature followed by encryption" approach. In this paper we propose a multi-signcryption model based on mlti-signature and signcryption, and various signatures and encryptions can be chosen flexibly in the model. At the same time, the model can be instantiated into the multi-signcryption scheme to a single or a group message and the multi-signcryption scheme which can only be decrypted by multi-receivers.

Stabilities of period and linear complexity of the self-shrinking sequence

WEI Xian-biao1;2;LIU San-yang1

J4. 2004, 31(3):  465-468. 

Abstract ( 1586 )   Save

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From the cryptographic viewpoint, stabilities of period and linear complexity of period sequences are important measures for unpredictability and randomness. Using the rational fraction notation and the minimum polynomial of the sequences, we discuss the stabilities of self-shrinking sequences. The weight period W^Cⁿ(s^∞) and the eight complxity W^{P^u}(s^∞) of the self-shrinking sequence are given when u is one or two.

A noval rough set theory-based decision table discretization algorithm

ZHANG Jian-jun1;ZHANG Jing-bo2

J4. 2004, 31(3):  469-472. 

Abstract ( 1548 )   Save

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The application of the rough set theory in the discretization of the decision table is studied, and a noval discretization algorithm based on the rough set theory is presented. The algorithm of this paper is based on the importance of condition attributes. Firstly, the iner-information between condition attributes and decision attributes is used to measure the importance of condition attributes, according to which the condition attributes are sorted in a descending order. Secondly, all break points of every condition attributes are examined and the redundant ones are climinated. Finally, each value in the decision table is replaced by a number representing the break point, and then the decision table is discretized.

A nonlinear filtering algorithm and achievement based on frequency estimation of MPSK modulated signals

LI Jing1;2;ZHU Jiang1;ZHANG Er-yang1;SHEN Rong-jun3

J4. 2004, 31(3):  473-475. 

Abstract ( 1950 )   Save

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Based on the nonlinear frequency algorithm, the nonlinear transform of white Gaussian noise, which is added to the received signals are analyzed. And the idea of applying nonlinear filtering(the median filtering) algorithm to nonlinear frequency estimation is proposed. At the same time, Monte Carlo simulation is used to validate the idea. The results show that the Mean Square Error(MES) of frequency estimation using a median filter is better than that by using a mean value filter.

Chaos communication simulation based on asynchronous FM-DCSK

ZHANG Yi-wei1;KE Xi-zheng1;ZHANG Xiao-qi2

J4. 2004, 31(3):  476-478. 

Abstract ( 1666 )   Save

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This paper presents and asynchronous demodulation method based on FM-DCSK and solves the synchronous problem is demodulation by amtching of the code element position, which lowers the system requirement. The method can demodulate original information evey if some noise is added to the system. Compared with the demodulation results of ideal synchronization, the simulation results prove the efficiency and practicality of this method.

An improved residual test method for soft fault detection

WANG Zhi-sheng;WANG Dao-bo;CAI Zong-yan

J4. 2004, 31(3):  479-482. 

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The residual test method, a common fault detection method for sensors, is insensitive to soft fault detection. For the sake of identifying soft faults effectively, a new residual test method based on moving subnormal states is proposed in this paper. And its validity is testified by mathematical simulation results, as shown in figures 1 through 4.

The adaptive fusion algorithm in multiple-sensors detection system

WANG Yong;LIU Wen-jiang;HU Jun;HU Huai-zhong;LI Jia

J4. 2004, 31(3):  483-487. 

Abstract ( 1794 )   Save

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By analyzing the principle of distributed detection system, a novel optimal global fusion rule is presented based on parallel detection system. This algorithm modify the fusion center's decision rule with the error between local decision and the fusion center's decision. Results shows that the detection performance is obviously improved.

The analysis of the stability of the fiber optic pulse magnetic field sensor based on the Faraday effect

PEI Bo;ZHOU Sheng-jun;LI Yu-quan

J4. 2004, 31(3):  488-492. 

Abstract ( 1446 )   Save

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The signal output expression for the fiber optic pulse magnetic field sensor based on the Faraday effect is deduced by the Jones matrix. The influence of linear birefringence on measurement accuracy is analyzed. The theoretical description is used to develop practically applicable methods of eliminating the temperature and vibration drift caused by the linear birefringence in the Faraday material. The temperature drift caused by the circular birefringence in the Faraday material is avoided. Accuracies of up to 0.15% error over a temperature range from -20℃~60℃ have been achieved.