Most downloaded articles

  • Display Type:
  • Text List
  • Abstract List
  • 1  Design of high-speed PLC module based on low voltage power line
    LIN Jia-sen LI Zhi LI Qiao-feng MA Yi-sen
    2012, 10(1):22-26.
    [Abstract](11686) [HTML](0) [PDF 459.40 K](15070)
    Abstract:
    Effective choice of the solution is essential to achieve a real-time, bi-directional(full- duplex) communication of the smart grid. The Power Line Carrier(PLC) technology provides a low-cost solution, which suits China's own national conditions. In this paper, the advantages of OFDM PLC modulation technology are introduced. A PLC module of system model is established through the analysis of the input impedance under the low-voltage power line channel. The high-speed PLC module based on low-voltage Power Line is also designed according to the studies of power line channel. The results show that the design of the PLC module has featured high receiving sensitivity and anti-noise ability.
    2  An overview of Multi-Path Transmission Control Protocol technology
    WANG Yi LIAO Xiao-ju PAN Ze-you
    2011, 9(1):7-11.
    [Abstract](12162) [HTML](0) [PDF 306.45 K](14511)
    Abstract:
    With the development of Internet applications, users’ demand for bandwidth is soaring sharply. Meanwhile,along with the development of broadband access technology, the endpoint can also adopt multiple network accesses. But due to one-way communication of traditional Transmission Control Protocol(TCP),the waste of resources will exist. To this end,IETF has specifically proposed Multi-Path TCP(MPTCP) to implement TCP multiplexing,thereby enhancing the efficiency and robustness. This paper gives a review of the IETF’s research on MPTCP,including MPTCP architecture, routing and congestion control, aiming to provide a reference for deeply studying.
    3  Measure techniques for the true RMS of any high frequency signal
    WANG Xiao-xia CHEN Lian LI Xin-yao
    2010, 8(5):569-572.
    [Abstract](11339) [HTML](0) [PDF 350.43 K](13880)
    Abstract:
    Traditional methods and instruments are not able to measure the true Root Mean Square(RMS) of distortion sine wave or non-sine signal accurately. This article introduces a method to measure the true RMS of any high frequency signal by using the true RMS measurement IC,AD536A,designed by AD corporation. The paper analyses the difference between the RMS measured by the average measure method and the true RMS in theory. It explains the disadvantages of current RMS measure method,and presents the design of true RMS measure circuit. The experiment results prove that the proposed method and circuit can measure the true RMS of any high frequency signal accurately.
    4  Design of high precision and high stability differential amplifying circuit for a special strain gauge
    JIANG Xiao-guo YANG Xing-lin LI Hong WEN Long SHI Jin-shui ZHANG Kai-zhi LI Jing WANG Yuan
    2010, 8(5):573-576.
    [Abstract](8719) [HTML](0) [PDF 398.78 K](13564)
    Abstract:
    The requirements for micro stress measurement of strain gauge are high precision,high linearity,high stability and high gain. One kind of differential amplifier circuit with excellent performance was designed. Some skillful techniques were adopted to avoid common voltage in the circuit and to reduce the temperature drift. The gain linearity is about 0.01%,and its Common-Mode Rejection Ratio(CMRR) is about 129 dB under work conditions.
    5  Underground personnel positioning system based on pedestrian dead reckoning
    XIAO Yong-jian XIAO Li SUN Zhi-gang
    2013, 11(4):583-587.
    [Abstract](10910) [HTML](0) [PDF 467.23 K](13525)
    Abstract:
    Aiming at the problems in existing underground personnel positioning systems, an assisted positioning method based on pedestrian dead reckoning is proposed. Low-cost Inertial Measurement Unit(IMU) and magnetometer are employed to constitute a stable Attitude Heading Reference System (AHRS). The theory of inertial navigation is utilized, an algorithm for step detection is described, and Zero velocity Update(ZUPT) is adopted for velocity and position estimation to compose a pedestrian dead reckoning system. An experiment is performed in the corridor of a laboratory building to emulate the underground mine road environment. The experimental results demonstrate that the dead reckoning performs well and this method is an effective complement to existing underground positioning by improving the positioning accuracy.
    6  Design and applications of THz metamaterials and metasurfaces
    WANG Bo ZHANG Yan
    2015, 13(1):1-12. DOI: 10.11805/TKYDA201501.0001
    [Abstract](13279) [HTML](0) [PDF 1.99 M](12927)
    Abstract:
    Terahertz(THz) optoelectronics has promoted the development of the THz generation, transparent control, and detection methods,and hastened many devices in the past decades. Especially, THz metamaterials and metasurfaces will exhibit extraordinary electromagnetic response when the subwavelength scale metal structure is excited by the THz illumination. Therefore, they have been applied to the devices such as wave beam shaper, waveguide, and modulator etc. The THz metamaterials and metasurfaces also show the potential applications in the research fields such as sensors, communications, and radars. In this paper, the works about the spectrum and wavefront modulation with THz metadevices carried out in our group are summarized. The basic theory and corresponding experiment results for different devices are introduced. It is expected these works can pave the avenue of the application of the THz metadevices.
    7  Basic principles and research progress of laser simulation of ionization radiation effect in semiconductor devices
    LI Mo SUN Peng SONG Yu DAI Gang ZHANG Jiana
    2015, 13(1):160-168. DOI: 10.11805/TKYDA201501.0160
    [Abstract](9510) [HTML](0) [PDF 623.30 K](11415)
    Abstract:
    According to the requirements of safe, simple and nondestructive radiation effect investigation of semiconductor devices, the method of laser simulation was proposed and greatly promoted. Compared with large-scale facilities, laser simulation has various unique advantages. It helps understand the ionization radiation effect in depth and is an effective low-cost, table-top supplement for the hardness assurance. Its research shows great significance for radiation effect study in both theory and practice. In this paper, the basic principles of the interactions of γ and laser with semiconductor devices are firstly presented. Then the physical basics and characteristics of laser simulation are given, with the research progress review followed. The existing problems of current research are deeply discussed providing with feasible research approaches. In the end, necessary research contents in the future are proposed.
    8  Circuit design of RFID card reader based on ARM
    JIANG Xiao-ping LI Zhong-jie YU Xiao-feng
    2010, 8(4):451-454.
    [Abstract](12340) [HTML](0) [PDF 370.26 K](11299)
    Abstract:
    Radio Frequency IDentification(RFID) series Radio Frequency(RF) card has been applied widely because of its stability,reliability and easy operation features. Aiming at multiple protocols,such as ISO14443 protocol,ISO15693 protocol and Tag-it protocol,this study proposed a new type of circuit design based on Advanced RISC Machine(ARM) for the RFID series RF card reader. The data stream encryption was implemented by using peripheral device in the operation. The system composition,working principle and work flow were introduced. Then,the detailed circuit design of the RF network and encryption hardware were presented,and the test and analysis for the design were performed. The results showed that the circuit could accurately read, write and encrypt various types of card within effective range.
    9  Terahertz fuze antenna technique based on dielectric lens
    ZHANG Lidong DAI Zuoxing
    2015, 13(1):31-34. DOI: 10.11805/TKYDA201501.0031
    [Abstract](10918) [HTML](0) [PDF 490.45 K](11253)
    Abstract:
    The background requirements of the fuze antenna in terahertz spectrum as well as its advantages and disadvantages are introduced. The working principles and application characteristics of dielectric lens antenna in terahertz frequency are analyzed in order to implement the terahertz fuze antenna. The longitudinal size of H plane horn antenna can be reduced effectively by using fuze antenna formed by an H plane horn with dielectric lens antenna. The terahertz fuze antenna with different beam angles is achieved by focal technology of lens. The feasibility of the technology solution is verified through simulation.
    10  Antenna optimization in the application of ultra-wideband communication
    ZHOU Tian YUE Yantao XU Guanxiong ZHANG Yangyang JI Chunlin
    2015, 13(1):76-79. DOI: 10.11805/TKYDA201501.0076
    [Abstract](10032) [HTML](0) [PDF 333.77 K](11146)
    Abstract:
    Ultra-wideband(UWB) communication shows its advantages of fast data transfer(100 Mb/s or above) in a relatively short distance(typically below 10 m) with relatively weak power consumption (energy spectrum below -41.3 dBm/MHz). Integrated with Multiple Input Multiple Output(MIMO) technology, channel capacity could be further enhanced. As a critical link in the ultrawideband communication,UWB antenna needs extra efforts in design optimization to boost the performance of the whole system. UWB antenna is defined as the antenna whose bandwidth exceeds 500 MHz or relative bandwidth greater than 20%. This paper takes the most representative Vivaldi antenna as a show case for multi-objective optimization design with statistical methods. The optimized miniaturized antenna(sized130 mm×100 mm) shows a -10 dB bandwidth of 2.4 GHz. The design method provides guidance in common wideband,multi-parameter antenna design.
    11  Design of high-speed data acquisition system based on band-pass sampling
    HE Xiao-dong DING Li
    2010, 8(3):313-317.
    [Abstract](10212) [HTML](0) [PDF 397.43 K](10853)
    Abstract:
    High-speed data acquisition system is an important component in modern radar signal processing. A design of high-speed data acquisition system based on band-pass sampling was presented and applied to the signal processing of wideband receiver. The Virtex Series FPGA was used as the main platform to control the high-speed ADC08D1000 for completing data acquisition, transmission,storage and signal processing. High-speed First Input First Output(FIFOs) were selected as the storage devices to implement data rate conversion. The system realized the software and hardware design,and test results verified the feasibility of the solution.
    12  LWIP’s Implementation based on TMS320DM642 platform
    XU Ping QING Lin-bo HE Xiao-hai YANG Chao XU Guang-hui
    2010, 8(1):67-70.
    [Abstract](11024) [HTML](0) [PDF 868.96 K](10836)
    Abstract:
    The implementation of TCP/IP protocol stack on TM320DM642 platform could provide technological support for the application of multimedia embedded systems to networks. Both the function of TM320DM642 chip and the hierarchical structure of LWIP(Light Weight Internet Protocol) were analyzed. Network communications for TM320DM642 systems were implemented by the transplantation of LWIP, not by a solution scheme of NDK(Network Developer’s Kit). Testing examples verified the effectiveness of the LWIP transplanted method.
    13  Design and implementation of high speed and general-purpose digital modulator
    WANG Peng YANG Chun WEN Zhao-Jin
    2010, 8(3):247-250.
    [Abstract](12738) [HTML](0) [PDF 471.65 K](10829)
    Abstract:
    This article introduces a new type of high speed,multi-modulated digital modulator with adjustable center frequency and bit rate features. It can realize the Quadrature Phase Shift Keying(QPSK) and 16QAM(Quadrature Amplitude Modulation) with 80 MHz center frequency and 7.936 5 MHz bandwidth. The general-purpose modulation arithmetic based on software radio,symbol mapping and the realization of pulse shaping filter are discussed. The measuring results demonstrate that the modulation scheme meets the requirements of practicability and general utilization.
    14  Design and FPGA realization of code tracking loop in noncoherent spectrum spread receiver
    MIAO Jiang-hong MA Guo-ning HE Yu-dong YIN Liang
    2010, 8(6):647-651.
    [Abstract](10308) [HTML](0) [PDF 544.83 K](10774)
    Abstract:
    The design of code tracking loop is a key sector of the realization of noncoherent spectrum spread receiver. In order to realize the code tracking in noncoherent spectrum spread receiver, an energy-normalization digital delay-locked loop was designed, the structure of the loop and the calculating procedure of loop parameters were introduced. The characteristic of noncoherent spectrum spread was analyzed first,and then the key point of the loop design was pointed out. Based on this, the design and realization methods of code loop discriminator, loop filter, early and lag code generator were expatiated. A set of specific loop parameters were introduced as well. Modelsim simulation results and FPGA actual measured data prove the precise code tracking ability of the design.
    15  FPGA implementation of hyperbolic function based on CORDIC algorithm
    ZHOU Xiao-qing LI He-sheng TAO Rong-hui CAI Ying-wu
    2010, 8(2):211-214.
    [Abstract](13127) [HTML](0) [PDF 576.88 K](10582)
    Abstract:
    The application of CORDIC(COordinate Rotation DIgital Computing) arithmetic in solving transcendental function has become popular in modern engineering. A brief introduction of CORDIC arithmetic was given in this study. Taking the hyperbolic sine and cosine functions as examples, the method of realizing the arithmetic in FPGA was presented and simulated on ISE(Integrated Software Environment) platform. The result showed this arithmetic was of good precision and instantaneity because of using pipeline. This arithmetic has great practical value in some applications. In addition, a curve of the relationship between the iterative number and the error obtained by the Matlab simulation of the arithmetic can help designers planning the number of iterations for practical applications.
    16  Optically-addressing spatial light modulation technology
    JIA Zhuo LIU Hao DENG Yifeng DENG Hong
    2015, 13(1):174-178. DOI: 10.11805/TKYDA201501.0174
    [Abstract](8059) [HTML](0) [PDF 698.05 K](10540)
    Abstract:
    The Spatial Light Modulation(SLM) technology has been widely applied to the fields of threshold switch, high speed optical interconnection and optical logic operations, which demands good performance on the real-time and fast optical signal addressing. Compared with Electro-Addressing SLM(EA-SLM), Optically-Addressing SLM(OA-SLM) shows great advantages of fast speed and high resolution by parallel addressing. Nevertheless, how to achieve fast and stable optically addressing is the key point in practice. Based on ZnO thin film as a photoconductive layer, Liquid Crystal OASLM(LC-OASLM) is designed and fabricated; the modulation of the readout light intensity and phase distribution in the two-dimensional space is achieved effectively.
    17  Oilfield information query system design based on WebGIS
    ZOU Xiang QIN Linbo HE Xiaohai ZHANG Yuqiang XU Shunfei
    2015, 13(1):111-117. DOI: 10.11805/TKYDA201501.0111
    [Abstract](6342) [HTML](0) [PDF 1.63 M](10491)
    Abstract:
    The corresponding solutions are proposed to tackle with the disadvantages of conventional oilfield Geographic Information System(GIS), including inconvenience of Client/Server(C/S) mode operation and maintenance, being unable to perform real-time online Point of Interest(POI) rendering, being incapable of segmentation and location according to regions, etc. An oilfield information query system of Browser/Serve(B/S) framework based on AJAX+JSON+HTML5 is designed and implemented. Experimental results show that the POI real-time rendering and regional segmentation improve on their interactivities, and the experiences of users are enriched, which meets the actual requirements of oilfield development. This work has paved the way for the development of diversified network services.
    18  Multiple targets tracking system of the High Frequency ground-wave radar
    LUO Ya LIAO Qingmin WANG Desheng
    2015, 13(1):35-39. DOI: 10.11805/TKYDA201501.0035
    [Abstract](7285) [HTML](0) [PDF 424.99 K](10380)
    Abstract:
    A double gate setting with priority of Doppler velocity and the Extended Kalman Filter(EKF) based Multiple Hypothesis Tracking(MHT) algorithm are proposed in order to realize Multiple Targets Tracking(MTT) in High Frequency(HF) ground-wave radar, and to effectively improve the performance of MTT by using the Doppler measurement. In the EKF based MHT, parameters obtained in the EKF are adopted directly to calculate the probability of each hypothesis. A simulation scene is built, and the EKF based MHT algorithm is compared with the one which assumes that the Doppler measurement is independent from the radius measurement. Simulation results show that the double gate setting helps induce number of clutter, and the EKF-based MHT algorithm is better than the other one under dense environments of HF ground-wave radar with stronger track-catching and false-alarm-filtering ability and higher efficiency.
    19  Terahertz signal detector improvement based on capacitive coupling structure
    XU Lei TU Xuecou WAN Chao PEI Yufeng KANG Lin WU Peiheng
    2015, 13(1):27-30. DOI: 10.11805/TKYDA201501.0027
    [Abstract](7624) [HTML](0) [PDF 496.27 K](10377)
    Abstract:
    A detector can achieve quick response when it is much smaller than the wavelength of the source signal in THz wave band at the expense of signal coupling capability.Therefore, an antenna is applied to collect signals in order to enhance the signal coupling capability of the detector.The properties of antenna determine the frequency response band,the sensitivity and other parameters of the detector directly. A planar-integrated antenna is adopted for signal acquisition in the Nb5N6 microbolometer detector, which is fabricated by lithography,lift-off and other processes of micro-fabrication. The Nb5N6 microbolometer is placed in the center of the planar antenna. Aiming for the center frequency of 0.32 THz, a special capacitive coupling design is proposed to improve the signal coupling capability.
    20  PSP blind separation algorithm for GMSK mixed signals
    ZHANG Hao YANG Yuhong XIN Gang DU Sen
    2015, 13(1):142-147. DOI: 10.11805/TKYDA201501.0142
    [Abstract](7746) [HTML](0) [PDF 383.43 K](10355)
    Abstract:
    The single-channel blind separation of GMSK(Gaussian Minimum Shift Keying) mixing signals is researched. The GMSK mixing signals can not be separated by the Per-Survivor Processing (PSP) algorithm directly, therefore, linear approximation processing of the GMSK signal is considered, which enables GMSK signal to be separated by the PSP algorithm. This algorithm separates the GMSK mixing signals by maximum likelihood estimation in the joint space of the symbol sequential and the channel parameters, reserves the best path and outputs the symbol pairs to get the separated signals. Simulation results show that the bit error rate performance produced by the PSP algorithm on separating the GMSK mixing signals is slightly better than that produced by the particle filtering algorithm; and the complexity of the proposed PSP algorithm is much smaller.

    Current Issue


    Volume , No.

    Table of Contents

    Archive

    Volume

    Issue

    Most Read

    Most Cited

    Most Downloaded