Table of Content

15 June 2011 Volume 24 Issue 6
    Doppler Spread Estimation for Mobile OFDM Systems
    MENG Jian-Gang, CHEN Jian-Chun
    . 2011, 24(6):  1. 
    Abstract ( 1526 )   PDF (535KB) ( 1274 )  
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    A channel auto-correlation function algorithm is proposed for Doppler spread estimation.The OVSF is inserted into OFDM symbols to find the auto-correlation function of time domain channel estimates and then estimate the Doppler spread.Simulation results show that the proposed Doppler spread estimator can provide high estimation accuracy for a wide range of Doppler spread.

    Simulation of Three-phase Full-bridge Control Rectifier Circuit and its Power Factor and Harmonic Analysis
    ZHAO Qi, FANG Zu-Hua
    . 2011, 24(6):  4. 
    Abstract ( 1612 )   PDF (567KB) ( 1120 )  
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    The simulation model of three-phase bridge controlled rectifier circuit perform dynamic simulation based on Matlab/Simulink.Resistance-Inductance Load Rectification Circuit is one of the main harmonic sources.By neglecting the process of commutation and DC current pulsation,the dynamic simulation analyses of the power factor and harmonics for Resistance-Inductance Load three-phase full-bridge are performed.The results show that the simulating model is correct,and it makes complicated calculation simple and clear by simulation.

    Investigation on Channel Estimation Algorithms for LTE PUSCH
    SHENG Hong-Ning
    . 2011, 24(6):  7. 
    Abstract ( 1954 )   PDF (552KB) ( 1149 )  
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    This paper investigates the channel estimation techniques for LTE uplink PUSCH(Physical Uplink Shared Channel),and a simplified MMSE estimator is proposed for the PUSCH,which effectively reduces the complexity of the algorithm compared with MMSE algorithm.The simulation results show that the simplified scheme has good performance.

    A Proof Method of Fermat's Last Theorem
    RAO Shilin,RAO Xuemei,RAO Xuefang
    . 2011, 24(6):  11. 
    Abstract ( 1223 )   PDF (381KB) ( 1092 )  
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    This paper proposes a R hypothesis and a theorem,and proves them by prime number theory.Fermat's Last Theorem is proved successfully by R hypothesis and in turn,R hypothesis is also proved hereby by Fermat's Last Theorem,which means the R hypothesis and Fermat's Last Theorem are the equivalent to each other.

    Comparison of Channel Estimation Algorithms for the OFDM System
    WANG Dong, ZHANG Yani
    . 2011, 24(6):  13. 
    Abstract ( 2111 )   PDF (318KB) ( 1123 )  
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    This paper studies channel estimation algorithms based on LS,MMSE and SVD for OFDM system,and their performances are analyzed and compared.SVD-based algorithm can lower the complexity of computation,simply the MMSE algorithm,and achieve good performance.

    FPGA Hardware Implementation of Wavelet Transform Lifting Based on Dual-Core Computing
    ZHOU Xin-Wen, ZHONG Ming-Guang
    . 2011, 24(6):  15. 
    Abstract ( 1360 )   PDF (802KB) ( 948 )  
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    Orthogonal wavelet transform is achieved in lifting steps in this paper.Derivation of the decomposition of traditional wavelet filters into lifting steps is given.The wavelet transform module is realized with dual-core computing in the FPGA hardware platform.Using single clock,the system meets the requirements of real-time processing without increasing the system design complexity and power consumption.Simulation shows that the system is stable and reliable.

    MODBUS Accord and Application of Inverter to ARM Cortex-M3
    WU Yinhua, ZHAO Min
    . 2011, 24(6):  19. 
    Abstract ( 1672 )   PDF (608KB) ( 1044 )  
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    The MODBUS protocol and its composition are introduced with the application of inverter communication.The circuit interface of RS485 is given and the execution program of MODBUS protocol is given based on ARM Cotex-M3 MCU.The embedded system for F2000-G is developed to control the AC motor for its use in NDT experiment apparatus.

    Simulation of Electronic Properties of MFIS Structure Device with Atlas
    ZHANG Junjie
    . 2011, 24(6):  23. 
    Abstract ( 1113 )   PDF (422KB) ( 1053 )  
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    Using the device simulator Atlas,the C-V characteristic and memory of MFIS structure device are simulated.The effects of applied voltage,thickness and material of insulator layer are discussed.This work may offer guidelines to the design and performance improvement of MFIS structure devices.

    Analysis of and Research on SD Card Interface for Embedded Systems
    WANG Wenhai
    . 2011, 24(6):  26. 
    Abstract ( 1483 )   PDF (346KB) ( 1036 )  
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    The SD card is a device based on flash memory semiconductor to develop a new generation of memory devices.SD cards are now widely used in various portable devices,and many embedded devices also choose to use the SD card to increase system stability and reduce costs.This article analyzes the characteristics of embedded systems,and discusses the embedded system based on SD card interface hardware and software design in depth.

    Design of a Discriminate Delay Circuit
    ZENG Yi
    . 2011, 24(6):  28. 
    Abstract ( 1196 )   PDF (491KB) ( 967 )  
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    This paper describes a circuit design in which a signal output happens only when two inputs meet certain set value and reach the set time.Schema experiment shows that the design is feasible with good reliability and stability.

    Development of Photovoltaic Grid Generation Simulator
    FU Li
    . 2011, 24(6):  30. 
    Abstract ( 1134 )   PDF (593KB) ( 904 )  
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    A simulation grid system is developed to achieve frequency tracking,maximum power tracking,phase tracking,input under-voltage protections,output over-current protection,and anti-islanding functions.The Atmega16 high-speed microcontrollers with integrated timer/counter function are used,the fast PWM timer T/C2 is used to achieve SPWM signal generation,and the input capture function of T/C1 is used to achieve frequency and phase monitoring and tracking,and realized the distortion,the input voltage,output current detection and control of other physical quantities.

    NAND Flash ECC Check-Out Based on FPGA
    LV Xiaowei
    . 2011, 24(6):  34. 
    Abstract ( 1196 )   PDF (899KB) ( 902 )  
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    ECC checkout is achieved based on hamming encoder in Altera Quartus II 7.0 environment.Experimental results show this procedure realizes each 256 bytes born 3 bytes ECC check-out data.Moreover,it can not only ensure single-bit and double-bit detection,but also locate the error and correct it,which can be applied to FPGA design of Read-Write Controller to realize the ECC check-out and guarantee reliability of data transmission.

    Object-Oriented Classification of the High-resolution Remote Sensing Image
    WANG Lin
    . 2011, 24(6):  38. 
    Abstract ( 1397 )   PDF (549KB) ( 957 )  
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    Special high-resolution remote sensing classification software eCognition adopts a classification technology of the bran-new object-oriented to classify the image and extract information.eCognition adopts the method of multi-resolution object cutting to produce the image object,and it improves the SNR of the classification information.A comparison of the classification results of eCognition and that of the traditional classification method indicates that the feature extraction operator of eCognition is more suitable for the classification of high-resolution remote sensing whose information is abundant in structure and geometry.

    Design and Implementation of the LDPC Coder Based on IEEE802.16e
    LI Chao, SHI Lei
    . 2011, 24(6):  40. 
    Abstract ( 1223 )   PDF (471KB) ( 916 )  
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    Based on the definition of LDPC in 802.16e standard,an encoder is designed for FPGA.The Linear time encoding method is used in the encoding scheme,which reduces the quantity of logic resources and improves the encoding speed.

    PLC Control of the Mine Hoist Braking Device
    ZHAO Haitao, ZHAO Jiangtao
    . 2011, 24(6):  43. 
    Abstract ( 1394 )   PDF (512KB) ( 943 )  
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    The causes of mine hoist hydraulic brakes accidents are analyzed,and based on the hydraulic working principles,the electronic control system with PLC control process and precautions are discussed.The control system is improved according to the reliability analysis.The improved control system has better reliability,mutual matching of the devices,and flexible function shifting.

    A Short-range Wireless Video Transmission System Based on MPEG-4 Encoding
    GUAN Xiaolei, LI Zhiqiang
    . 2011, 24(6):  45. 
    Abstract ( 1570 )   PDF (838KB) ( 926 )  
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    In order to achieve short-range wireless video transmission,this paper proposes a short-range wireless video transmission scheme based on MPEG-4 code.The data collected from a CMOS camera OV7620 are processed by a dedicated MPEG-4 encoder ML86410 to obtain the MPEG-4 data stream of less than 2 Mbit·s-1,which is then sent through the wireless nRF24L01 under the control of the FPGA controller.The receiver uses the same chips nRF24LU1 to receive wireless data with USB protocol and interface.Then the stream can be sent into PC for display.Circuit board simulation achieves good images,which shows that the wireless transmission of video circuit is successful.

    Computer Control System Lightning Protection
    LI Lin
    . 2011, 24(6):  51. 
    Abstract ( 1107 )   PDF (528KB) ( 909 )  
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    Lightning is a natural disaster that releases powerful pulse current with a huge mechanical energy and heat,and thus inducing over-voltage or over-current pulse and resulting in serious consequences.Power electronic systems therefore need to strengthen protective measures against lightning.This paper deals with how thunder and lightning wreck damage on the computer control system and the major means by which lightning surge intrudes the control system,and proposes corresponding lightning protection measures.

    A General Method for Nand Flash Parameter Identification
    LIU Guiying
    . 2011, 24(6):  54. 
    Abstract ( 1192 )   PDF (573KB) ( 932 )  
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    This article describes a general method for obtaining the corresponding parameters from an NAND flash chip.By this method the latest NAND flash can be used even without datasheet.

    Design of BSP for Vxworks Based on Pentium4 CPU
    WANG Ke
    . 2011, 24(6):  57. 
    Abstract ( 1331 )   PDF (410KB) ( 919 )  
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    In the embedded system based on VxWorks,implement of BSP(Board Support Package) and device drivers is a difficulty and critical point.This paper studies the theory and the key technique in the implement of BSP and device drivers.An essential BSP based on processor Pentium4 is transplanted by Tornado,a IDE (Integrated Development Environment) developed by Wind River Systems,Inc.Then on the basis of the BSP,the versatile platform based on VxWorks and Pentium4 is developed.

    A SystemC-based Model of Hardware Task Management for Dynamically Reconfigurable Systems
    PAN Peng, LIN Shuisheng, HUANG Letian
    . 2011, 24(6):  60. 
    Abstract ( 1466 )   PDF (1045KB) ( 910 )  
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    A dynamically reconfigurable model with SystemC for hardware task management,which can be modified according to different strategies of hardware task management and reconfigurable resource,is presented in the paper.The simulation results show that by simulating the execution of hardware task set scheduled by specified management strategies in a designed reconfigurable resource,the model can be applied to get the real-time information of the schedule and placement,and evaluate strategies of hardware task management for dynamically reconfigurable systems along with application and architecture.

    Design of an Image Algorithm Assess Software Based on SQL Server2000
    LIANG Shuwei
    . 2011, 24(6):  65. 
    Abstract ( 1485 )   PDF (590KB) ( 931 )  
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    This paper introduces a design proposal of the image algorithm assess software based on SQL Server.Using object-oriented design,modular data packages are achieved.SQL Server is used to manage the algorithm and test data.By using the multi-process and multi-threading technology,the software realizes the background traversal algorithm to improve the speed of operation.Statistical test results can assist researchers in improving test efficiency.

    The Rational Distribution of Electric Power Resource Based on Dynamic Programming
    ZHANG Feifei,LIU Zongqi,WANG Miao
    . 2011, 24(6):  69. 
    Abstract ( 1693 )   PDF (475KB) ( 974 )  
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    This article presents a method of rational distribution of electric power resource based on dynamic programming,which is realized through the software of Matlab.This method proves a practical strategy in the field of Rational Distribution of Electric Power Resource.With its help,the optimal distribution of electric power resource can be achieved in short time.

    Segmentation of Images Based on Level Set Methods
    GUO Yuanka
    . 2011, 24(6):  71. 
    Abstract ( 1375 )   PDF (788KB) ( 1377 )  
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    This article concentrates on the research on segmentation of images based on level set.A variational level set algorithm for image segmentation is presented based on edge information.Without re-initialization,this algorithm completely eliminates the need for costly re-initialization,accelerates contour evolution,enhances robustness,and provides more flexible initialization methods.

    The Design of the B/S Structure-Based Freshmen Registration System
    HAN Yong
    . 2011, 24(6):  75. 
    Abstract ( 1204 )   PDF (491KB) ( 1014 )  
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    In order to improve the efficiency of Freshmen registration,a new registration system based on B/S structure is designed using asp.net technology as the main development tools.Practical uses show that the system is powerful,normative and easy to operate.

    Design and Implementation of the Technical Exchange Platform Based on php
    WANG Yage
    . 2011, 24(6):  78. 
    Abstract ( 1212 )   PDF (470KB) ( 985 )  
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    "Apache+php+MySQL” forms a complete set of development B/S structure of network information systems and tools.Being safe,reliable,and completely free,the open-sourced platform wins wide favors of network information system developers.With this set of tools development technology exchange platform as an example,this paper presents the Windows environment of installation,configuration and development of technical difficulties and the solving methods.

    Fault attack of Mickey-128
    ZHANG Peng, HU Yupu, ZHANG Tao
    . 2011, 24(6):  80. 
    Abstract ( 1172 )   PDF (511KB) ( 875 )  
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    By analyzing the weakness in design of the stream cipher Mickey-128,a differential fault attack is presented.When we induct 640 faults and have 960 stream key,we can find the initial state of register R and S,and find the entire stream key.In the initialization phase,when we induct 416 fault and have 12 480 stream key,we can find the 128-bit key-seed K and the initialization variable iv.

    Conformance Test on the BGP4+ under Linux System
    DING Xuelian
    . 2011, 24(6):  83. 
    Abstract ( 1326 )   PDF (612KB) ( 900 )  
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    This paper analyzes the feature of BGP4+ and describes the test suits using XML and tests against the implementation of BGP4+ distributed under Linux.The test result indicates that there are some inconsistent parts with RFC2858.

    Research of Radar Suppression Jamming Based on DJS
    HAN Ke, WANG Fuhong, WANG Jianlong
    . 2011, 24(6):  87. 
    Abstract ( 1490 )   PDF (663KB) ( 947 )  
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    As a new technology of Radar Jamming,Digital Jamming Synthesis is playing more and more important role in the modern war.The sampling signal of DJS should not necessarily be real-time.It can be changed by objects in the suppression,and the memory can re-fill the new waveform data.After digital to analog conversion and up-conversion,it can generate radio frequency interference signals.This technology has a lot of advantages,such as flexibility,adaptability of multi-signals,multi-threat,multi-radar,and the disturbance of VCO has been replaced gradually.

    The Power Spectrum Density of FH Signal Estimation
    YANG Xinfeng, CAO Yuanshu
    . 2011, 24(6):  90. 
    Abstract ( 1228 )   PDF (717KB) ( 1044 )  
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    The FH signal power spectrum density is analyzed and the shortcomings of the classical periodogram methods are pointed out.An appropriate method for and the parameters of FH signal power spectrum density estimation is given.Simulation results show that the improved method is feasible and has good estimation function.

    The Design and Realization of CPCI Data Bus
    LIU Qing, MA Tianyi
    . 2011, 24(6):  95. 
    Abstract ( 1372 )   PDF (509KB) ( 891 )  
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    FPGA is used to control the CPCI development conversion chip to achieve high-speed communication with the CPCI-bus.The results show that this design has good stability,fast transmission,high accuracy,and can be expanded to other CPCI embedded systems.

    A New Method of Harvesting Electromagnetic Energy for Wireless Sensor Node
    HU Tao, LONG Qing, MENG Hang
    . 2011, 24(6):  97. 
    Abstract ( 1892 )   PDF (674KB) ( 1360 )  
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    A new method of providing energy for wireless sensor node is developed by harvesting ambient electromagnetic energy like AM signals.Enough energy is harvested to drive the sensor node by doing the spectrum energy analysis of the location,and utilizing proper antenna and converting circuit.This paper also presents a low-power energy management circuit with wake-up mechanism,which renders the sensor node to work in a place with small amounts of electromagnetic energy.Besides,experiments and analysis about this energy-providing method's working stability and territory is conducted to evaluate its feasibility.

    Research on Sensor Fault Diagnosis of the Air-Conditioning
    DENG Yong, WANG Yan, WANG Chao
    . 2011, 24(6):  101. 
    Abstract ( 1783 )   PDF (600KB) ( 992 )  
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    A wavelet neural network (WNN) fault diagnosis strategy is proposed based on the air-conditioning unit in the common sensor faults.Sensor fault diagnosis system is based on the analysis of the primary failure of air-conditioning unit sensors.By comparing residuals of the sensor's actual measuring data and forecast data,it verifies the ability of fault diagnosis based on WNN.Besides,the residuals ratio in fault diagnosis base on the WNN and BP neural network is analyzed.Simulation shows that the fault diagnosis system based on the WNN has the advantages of simple structure,fast convergence rate,accurate diagnosis,and higher precision.

    Lightening Protection and Grounding Technology for Weather Stations
    ZHANG Jiguang
    . 2011, 24(6):  105. 
    Abstract ( 1336 )   PDF (640KB) ( 921 )  
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    With the dying out of manual meteorological equipments,automatic weather stations are now responsible for the collection of meteorological elements.In order to ensure the normal operation of the weather station,lightening protection and grounding are of great importance apart from routine maintenance.The paper describes the lightening protection and grounding system,which proves effective in practical use.The requirements for use are also given.

    Design of a Signal Generator for the Magnetic Material Tester Based on DDS
    MA Zaiyue, WANG Jingmei, SUN Jun, LI Li
    . 2011, 24(6):  108. 
    Abstract ( 1336 )   PDF (712KB) ( 948 )  
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    This paper introduces a new design method of designing the signal generator based on DDS in view of the specific requirements of excitation signal source for a certain type of magnetic material test equipment.On the basis of Altera Corporation's FPGA device,the design elements,hardware of the signal source as well as its realization in Quartus are given.The result shows that the signal generator can generate the required excitation signals preferably and meet the technical specifications of the design.

    Design of Triple Sensor Integrating Temperature,Humidity and Lighting
    YU Shuandao, ZHANG Jiangya, TANG Yaohua
    . 2011, 24(6):  112. 
    Abstract ( 1251 )   PDF (591KB) ( 871 )  
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    The design of triple sensor with relative temperature,humidity and lighting is provided with I2C data bus,and digital calibration.The sensor has many advantages,such as digital output,debugging-free,demarcating-free,peripheral device-free,I2C digital interface,8~12 bit temperature and humidity sensor,and 22 bite dynamic range (from 0.045 lumens to 188,000 lumens).The working voltage is 3.3 V,with a current of mere 20 μA at full capacity and 0.3 μA in dormant mode.The performance,specification timing and order of the sensor are described in detail,and the interface circuit and the related program using with single-chip are also given.Real-time monitoring shows that this sensor has the advantages of high precision,low cost,small size and easy interface.

    Overflow Protection Circuit for the Switching Power Supply
    ZHAO Wei
    . 2011, 24(6):  116. 
    Abstract ( 1494 )   PDF (350KB) ( 1008 )  
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    In view of the damage on the power supply by over load or short circuit at the output,this article introduces several power supply overflow protection electric circuits,and analyzes their working principles.

    Design of a Switching Power Supply Based on Sg3525
    WANG Xiaofeng, WANG Jingmei, SUN Jun, LI Li
    . 2011, 24(6):  118. 
    Abstract ( 1699 )   PDF (625KB) ( 987 )  
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    The internal structure of SG3525 chip is introduced,and its characteristics and working principle are analyzed.An adjustable duty cycle push-pull DC / DC switching power supply based on SG3525 is designed,and the design method and practical circuit are described.Finally,the tests of the power supply performance are given.Experiments show that the power supply have the advantages of high efficiency,stable output voltage and so on.

    Principle and Design of the 80 V Surge Absorber
    LI Jianguo
    . 2011, 24(6):  122. 
    Abstract ( 1198 )   PDF (327KB) ( 926 )  
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    In view of the direct current of airplane on the surge interference,this paper analyzes the feasibility of achieving 80 V surge absorber by the methods of voltage clamp bits and switch type voltage circuit.The problem is successfully solved by the design and experiment.

    Study on the Control of the High Thrust Permanent Magnet Liner Synchronous Motor Used in the Numerical Control Machine
    WANG Xiao
    . 2011, 24(6):  124. 
    Abstract ( 1422 )   PDF (783KB) ( 940 )  
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    Base on the national science and technology major projects of high thrust liner motor made in china,this paper tests the bilateral type high thrust permanent magnet synchronous linear motor,using Turbo Pmac Clipper as motion control to test velocity of liner motor in an attempt to get good response cure and reduce follow error of liner motor as much as possible with PID plus feedforward algorithm adjusted.The results show that the control method achieves good dynamic and static performance in the linear motor feed system.

    Design of a Driving Schedule Generator for the Area Array CCD Controlled by FPGA
    ZHU Binglian, DU Peiqiang, YUN Minghua
    . 2011, 24(6):  127. 
    Abstract ( 1429 )   PDF (881KB) ( 896 )  
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    In this paper,driving timing of Sony ICX098BQ area array CCD image sensor is analyzed.CCD timing generator with adjustable exposure time and its hardware circuit are designed.FPGA is chosen as the hardware design platform,and schedule generator is described with VHDL.The designed generator successfully fulfills function simulation with Quartus II 8.0 and fit into FPGA made by Altera.Actual tests show that driving schedule generator meets the driving requirement of area array CCD and achieves the design objectives.

    Research on Teaching Methods for Data Structures
    YANG Liying
    . 2011, 24(6):  131. 
    Abstract ( 1278 )   PDF (546KB) ( 753 )  
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    Based on the analysis of knowledge architecture and teaching object,this paper discusses the teaching methods in each of the four teaching activities,which covers teaching in classroom,practice,homework and teaching evaluation.These teaching methods have shown its validity in practice and can be used for reference in teaching data structures.

    SPSS in the Evaluation of Sustainable Development
    ZHANG Ying
    . 2011, 24(6):  134. 
    Abstract ( 1044 )   PDF (588KB) ( 750 )  
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    In this paper,the statistical software SPSS Heilongjiang reclamation area features a comprehensive evaluation of sustainable development.According to the calculation of the Heilongjiang Reclamation comprehensive evaluation of the past 10 years,an objective analysis is made of the value of sustainable development in Heilongjiang reclamation area,which finds the obstruction and negative aspects of sustainable development and constraints and provides some supportive information through scientific analysis.The paper puts forward some suggestions to accelerate the construction of modern large-scale farming.

    An Improved Dynamic User Authentication Protocol
    ZHANG Ming
    . 2011, 24(6):  137. 
    Abstract ( 1539 )   PDF (472KB) ( 827 )  
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    In view of fast user authentication,the dynamic user authentication protocol is introduced and the possible security risks are pointed out.Then an improvement of the dynamic user authentication protocol is proposed.Finally,the performance of the improved protocol and its application in wireless sensor networks in heterogeneous environment are discussed.

    Quality Control Analysis and Strategy of Communication Construction Project
    CHEN Yadong
    . 2011, 24(6):  140. 
    Abstract ( 1669 )   PDF (483KB) ( 698 )  
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    The quality of communication construction projects is essential to smooth communication,but communication is often subject to market,construction,investment,environment,engineering management,and other adverse factors,resulting in more difficult to ensure the quality of the project.According to the theory of project quality control,basis,principles etc,this paper analyzes the impact of factors related to communication quality of the project,discusses and proposes the communication quality control of construction projects related to strategy.


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