Home > Archive > 2017 No. 02

2017 No. 02

Publish Date：2017-02-06
ISSN：0258-7998
CN：11-2305/TN
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Review and Comment

New development of millimeter-wave antenna in E-band and V-band

DOI：10.16157/j.issn.0258-7998.2017.02.001

Author：Suo Yanchun1，Li Yonghong1，2，Zhang Enfeng1

Author Affilications：1.School of Instrument and Electronics，North University of China，Taiyuan 030051，China； 2.Kotel Aerospace Defense Technology Co.，LTD，Taiyuan 030024，China

Abstract：With the rapid development of wireless communication network, the demand of mobile broadband increasing. The conventional microwave spectrum resources have been rapidly depleted. Therefore, as a high-frequency millimeter-wave antenna, it has a wide application prospect. The article make a detailed description of the new development E-band and V-band antenna in recent years. The latest development of surface, planar and traveling wave antennas for E-band and V-band are introduced, and the characteristics and designing difficulties of the two-band antennas are analyzed.
Key word：
E-band
V-band
millimeter wave
antenna
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Analysis on key technologies of manufacturing industry in big data environment

DOI：10.16157/j.issn.0258-7998.2017.02.002

Author：Li Shaobo1，2，Chen Yongqian1

Author Affilications：1.Key Laboratory of Advanced Manufacturing Technology，Ministry of Education，Guizhou University，Guiyang 550025，China； 2.School of Mechanical Engineering，Guizhou University，Guiyang 550025，China

Abstract：With the integration and development of manufacturing and Internet of things(IoT), cloud computing, Internet and other information technology ，the era of big data in Manufacturing Industry has coming. In the big data environment, manufacturing technology will be a huge progress and reform. The paper starting from the characteristics of manufacturing data, outlining the technology framework of big data in manufacturing industry, and mainly analyzing the five key technologies of manufacturing industry under the big data，which are big data storage technology, big data processing technology, big data analysis technology and big data display technology, and provide reference for the development of big data in industry.
Key word：
manufacturing industry
big data
intelligent manufacturing
Hadoop
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Microelectronic Technology

CMOS low noise amplifier noise coefficient optimization calculation based on constant power consumption

DOI：10.16157/j.issn.0258-7998.2017.02.003

Author：Wang Dandan，Wang Jun，Wang Lin

Author Affilications：College of Information Engineering，Southwest University of Science and Technology，Mianyang 621010，China

Abstract：Based on constant power conditions, this paper by previously overlooked gate parasitic resistance and capacitance influence aim at noise amplifier noise coefficient, combined with the low noise amplifier(LNA) equivalent small signal model，noise coefficient expression is derived, and under constant power noise optimization method is proposed. Meanwhile the theory of the MATLAB simulation for raised noise coefficient optimization method and the simulation carried out to verify the theoretical results in ADS software.
Key word：
constant power consumption
low noise amplifier
noise coefficient
optimization method
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A microstrip Wilkinson power divider using periodically slow-wave structure

DOI：10.16157/j.issn.0258-7998.2017.02.004

Author：Lin Junming，Zheng Yaohua，Zhang Guohao

Author Affilications：School of Information, Guangdong University of Technology，Guangzhou 510000，China

Abstract：Aiming at the drawback that a conventional Wilkinson power divider occupies more space and suffer from frequency dispersion at high frequency bands, a miniaturized Wilkinson power divider operating at 900 MHz is presented. The miniaturization is achieved by realizing the power divider’s impedance transformers using slow wave structures which are designed by periodically loading transmission lines with open-circuit stubs. According to the simulated and measured results, three ports of the divider meet a good matching with the S11 -20.58 dB，S22 -23.62 dB，S21 -3.28 dB at 900 MHz based on FR4, which verifies the usability of the method.
Key word：
Wilkinson
power divider
periodically loaded slow wave structure
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Effective formal applications in CPU floating point unit

DOI：10.16157/j.issn.0258-7998.2017.02.005

Author：Zhu Feng，Lu Zhenghao，Zhu Qing

Author Affilications：Soochow University，Suzhou 215006，China

Abstract：With the increasing complexity of chip design, it is almost impossible to ensure the completeness of test space, especially corner cases. Formal verification is applied to block and subunit level design in industry due to systematic and efficient way to explore exhaustively all reachable state space. This paper describes our practical experiences and results with applying formal verification to floating point unit using Cadence JasperGold. Specially, FPV(Formal Property Verification) and SEC(Sequential Equivalence Checking) are applied to ECC(Error Correcting Code) as well as SAR(Software Architecture Register) in pipeline control and shared arithmetic modules respectively. The implemented results show that JasperGold improves verification quality with exposing corner cases, locates potential bugs accurately and speeds up verification achievement.
Key word：
floating point unit
formal verification
JasperGold
FPV
SEC
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Low overhead fault tolerant transmission mechanism for Network-on-Chip

DOI：10.16157/j.issn.0258-7998.2017.02.006

Author：Lin Xinxin，Wang Junshi，Lin Shuisheng，Huang Letian

Author Affilications：School of Communication and Information Engineering，University of Electronic and Science Technology of China， Chengdu 611731，China

Abstract：Reliability of Network-on-Chips(NoCs) becomes critical as the aggressive technology scaling. Variety of transmission mechanism to tolerant bit errors on links have been proposed to achieve the best tradeoff between performance and overhead. A transmission mechanism for NoCs based on Error Correction Code(ECC) and retransmission is proposed. It only provides error detectors to check the correctness of head flits at input ports of routers and reuses the decoders in Network Interfaces(NIs) to correct the errors in the whole packets. Through taking the advantage of the small scale of error detectors circuit, the proposed method can reduce the hardware overhead, power consumption and latency while maintains the equal reliability comparing with end-to-end and switch-to-switch ECC.
Key word：
Network-On-Chips
fault tolerant
reliability
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Design of top loading fractal photonic crystal Terahertz waveband antenna

DOI：10.16157/j.issn.0258-7998.2017.02.007

Author：Lin Bin

Author Affilications：School of Information Science and Technology，Xiamen University Tan Kah Kee College，Zhangzhou 363105，China

Abstract：According to the requirements of the Terahertz devices to the Terahertz waveband antenna′s performance, this paper creatively combined top loading technology, fractal structure, photonic crystal structure, dipole antenna, Polyethylene Terephthalate(PET) thin film substrate, designed a top loading fractal photonic crystal Terahertz waveband antenna, fabricated the antenna sample, simulated and actual tested the antenna′s return loss and radiation pattern characteristics, detailed discussed the influence on antenna′s performance by changing the dielectric substrate parameter. Simulation and measured results show that this antenna′s working central frequency is 1 THz, the antenna′s return loss minimum value is less than -20 dB, the antenna′s absolute working bandwidth is greater than 0.1 THz; the antenna′s relative working bandwidth is greater than 10%. This antenna has small size, high stability radiation characteristics, and large working bandwidth. This antenna has a broad application prospect in the Terahertz waveband field.
Key word：
top loading technology
fractal structure
photonic crystal structure
dipole antenna
Terahertz waveband antenna
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Design of resistant differential power analysis shift register based on SABL

DOI：10.16157/j.issn.0258-7998.2017.02.008

Author：Qian Haoyu，Wang Pengjun，Ding Dailu，Zhang Yuejun

Author Affilications：Institute of Circuits and Systems，Ningbo University，Ningbo 315211，China

Abstract：By researching on the principle of traditional shift register and Sense Amplifier Based Logic(SABL) circuit, a scheme of resistant differential power analysis shift register is proposed. Firstly, the proposed shift register circuit implements the clear set D flip-flop with the master-slave trigger mode based on SABL circuit. The D flip-flop and SABL logic gates are integrated to design a multi-bits shift register circuit. Spectre simulation results show that the circuit of shift register has correct logic function. Under testing of PVT combinations, NED and NSD of are lower than 2.66% and 0.63%, respectively. It is shows that the proposed shift register has significant performance in resistant differential power analysis.
Key word：
SABL
resistant differential power analysis
shift register
information security
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Embedded Technology

A design of visual area localization system for quadrotor

DOI：10.16157/j.issn.0258-7998.2017.02.009

Author：Zhang Peng，Shen Jie，Wang Li，Ren Chonggeng

Author Affilications：College of Automation and Electrical Engineering，Nanjing Tech University，Nanjing 211816，China

Abstract：This paper proposes a visual localization strategy based on quadrotor with micro camera. The pyramid Lucas-Kanade sparse optical flow is applied to obtain the horizontal deviation of feature points. The data fusion of height, inertia, and horizontal deviation is used as the input of positional PID controller. To reduce the error of tracking trajectory, the forward-backward error algorithm is employed to eliminate the mismatching points. Kalman filtering algorithm is adopted to estimate the current state when feature points are failed to be tracked. The simulation and experiment show the effectiveness of proposed method within a certain range.
Key word：
optical flow
data fusion
forward-backward error
PID
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Design and implementation of GCPLC based on K60

DOI：10.16157/j.issn.0258-7998.2017.02.010

Author：Si Xiaojun，Wang Yihuai，Bai Cong

Author Affilications：multitask；GCPLC；graphic component；RTOS

Abstract：This topic proposes the scheme of developing Graphic Component Programmable Logic Controller(GCPLC)，which is the innovation and new mode of traditional Programmable Logic Controller(PLC). The GCPLC has many characteristics, for instance, graphical drag programming, open twice programming architecture, component combination, development environment compatible, component extendible and the integration of RTOS. In addition, aimed at obtain breakthrough in technology architecture and method alone with the design ideas, the GCPLC has advantages of less difficulties in terminal-user programming, excellent division in technology and expansion in user-control. The GCPLC will replace traditional PLC in application.
Key word：
multitask
GCPLC
graphic component
RTOS
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Design of online corona loss monitoring system based on network synchronization technology

DOI：10.16157/j.issn.0258-7998.2017.02.011

Author：Wu Jian1，Fan Chuang1，Feng Guoliang2，Piao Heng2

Author Affilications：1.Shanxi Electric Power Research Institute，Xi′an 710054，China； 2.School of Automation Engineering，Northeast Dianli University，Jilin 132012，China

Abstract：The network synchronization acquisition card is designed based on GPS timing technology，to measure the corona signal of the high voltage AC transmission line. Acquisition card sampling frequency is up to 10 MS/s, using the TCP/IP protocol for data transmission and can be involved in the local area network or the Internet. Using instantaneous power method to analyze and calculate the corona loss of high voltage transmission lines, the feasibility of measuring corona loss is verified by using the first method. The experimental results show that the system is able to obtain the detailed information of the corona discharge signal, and the system is more practical.
Key word：
network synchronization measurement
corona loss
high voltage shielding
instantaneous power calculation
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The parallel processing design of LiDAR point cloud calculation based on multicore DSP

DOI：10.16157/j.issn.0258-7998.2017.02.012

Author：Niu Jingyu，Hu Jian，Meng Fanrong，He Wenjing

Author Affilications：Key Laboratory of Quantitative Remote Sensing Information Technology，Academy of Opto-Electronics， Chinese Academy of Science，Beijing 100094，China

Abstract：Currently, the research on performing real-time points position cloud calculation method, which is aimed to obtain high precision surface models, is a trend of remote sensing technology. According to the features that airborne LiDAR point cloud calculation contains a large amount of computation and complex processing algorithms, a multi-core DSP parallel processing system is designed. This system, which is based on TMS320C6678, implements efficiently. Firstly, the principles and characteristics of the LiDAR system are introduced briefly. Secondly, the architecture of this multi-core DSP parallel system is described in detail. Finally, the fight data, which is from an airborne LiDAR system experiment, has been used to prove the effectiveness of this parallel architecture. At the same time, the operational efficiency of single core and multi-core processor has been compared and analyzed.
Key word：
multicore DSP
parallel process
IPC
LiDAR points position calculation
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Direction-finding and searching instrument for autonomous underwater vehicle recovery

DOI：10.16157/j.issn.0258-7998.2017.02.013

Author：Hu Biwei，Cai Wenyu，Wen Duanqiang，Zhang Juanjuan

Author Affilications：Electronic Information College，Hangzhou Dianzi University，Hangzhou 310018，China

Abstract：The paper designs a direction-finding and searching instrument for Autonomous Underwater Vehicle(AUV) recovery, which embraces the high localization accuracy and can support a variety of RF frequencies. A directional antenna is responsible for receiving signal from RF transmitter which has been installed in the AUV. Firstly, the searching instrument would enlarge and detect the signal by using a RF amplifier module and a RF detection module, which greatly ensures the anti-interference ability of the signal in the transmission process and the maximum distance of the communication. Then distance between the signal receiver and transmitter and signal intensity would be displayed by using a signal display module. Finally, radio frequency positioning for the AUV would be completed. Experimental results show that the instrument′s applicable frequency band is from 50 MHz to 1 200 MHz, therefore it can support the RF signal source with different frequency. The measured maximum distance can reach 10 km, and the error can be controlled within 10% while ensuring high accuracy of the direction measurement for the searching instrument.
Key word：
autonomous underwater vehicle recovery
radio frequency positioning
searching instrument
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Measurement Control Technology and Instruments

A high-gain signal processing method for code phase difference estimation of GNSS-R altimetry

DOI：10.16157/j.issn.0258-7998.2017.02.014

Author：Wang Yiran，Mu Dongjie，Sun Quan，Lan Qian，Lin Tuo

Author Affilications：China National Electronics Imp. & Exp. Corp.，Beijing 100036，China

Abstract：A high-speed high-gain signal processing method for code phase difference estimation of global navigation satellite system reflection(GNSS-R) altimetry is proposed in this paper. The method is given here to improve the processing gain and reduce the performance degradation due to the Doppler in dynamic conditions and the Squaring-Loss. Field experiments with real airborne and shore-based receivers demonstrate the effectiveness of this signal processing method. Experimental results show that, this method offers a 15% enhancement of measurement accuracy over conventional algorithms in airborne experiment, and a longer integration time, which offers a measurement accuracy of about 0.43 m in shore-based experiment.
Key word：
GNSS
reflected signal
receiver
delay Doppler maps
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Design of workshop production process tracking and control terminal based on Cortex-A9

DOI：10.16157/j.issn.0258-7998.2017.02.015

Author：Mao Yaqing1，Zhang Li1，Huang Kai2，Yu Xiao1

Author Affilications：1.School of Medicine Information，Xuzhou Medical College，Xuzhou 221000，China； 2.XUGONG Information Technology Co.，Ltd.，Xuzhou 221000，China

Abstract：With the development of the intelligent manufacturing, workshop automation level has been greatly improved. It is the faced problem that how to constantly track, control and coordinate production process and production elements to further improve the production efficiency. Based on Cortex-A9 and Android, this system has designed the tracking and control terminal of workshop manufacturing process. The design of terminal hardware has been designed based on Samsung Exynos 4412 with power supply, memory and bus control chips. By building Linux and Android system platform, developing device drivers and writing Android applications, the terminal software has been designed. The system realizes constantly tracking and controlling the production orders, equipment, personnel and production process. The system has advantages of rich hardware interface, friendly interface, high real-time and broad range of applications.
Key word：
Linux
Android
machine tool network
lean manufacturing
intelligent manufacturing
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Emotion recognition wristband device based on physiological signals

DOI：10.16157/j.issn.0258-7998.2017.02.016

Author：Li Yingchun1，You Lei1，He Jingkang1，Zhou Ke2，Zhao Liqiang1，Li Ye1

Author Affilications：1.School of Information Science and Technology，Shaanxi university of Science and Technology，Xi′an 710021，China； 2.Xi′an Sea Network Technology Co.Ltd.，Xi′an 710000，China

Abstract：For the requirement on affective computing, a STM32L0-based low power consumption wristband device to gather physiological signals is designed. Those collected physiological signals will be sent to smart device with Bluetooth 4.0 port through low power consumption Bluetooth wireless communication and analyzed by BP neural networks. Experiment result shows that this device can accurately detect heart rate, skin temperature, skin impedance and state of motion. This is a wearable device for affective computing which can identify emotional state of individuals with recognition rate of over 95% in tension, neutral and excitement through multidimensional physiological signal analysis.
Key word：
affective computing
signal processing
BP neural network
wearable
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Optimization of PID control in four rotor aircraft

DOI：10.16157/j.issn.0258-7998.2017.02.017

Author：Li Hang，Wang Yaoli

Author Affilications：College of Information Engineering，Taiyuan University of Technology，Taiyuan 030024，China

Abstract：In order to solve the problem of instability and sensitivity during flight of the quad-rotor aircraft，the conjugate gradient algorithm was introduced to self-tune the digital PID control parameters based on the mathematical model of quad-rotor aircraft. Combined the minimum-variance of control performance with control rate, the conjugate gradient algorithm interactively calculate the most optimized control parameters for the controlled system with changing characteristics, which can effectively improve the robustness of the system. This algorithm overcomes the identification of mathematical model and manual parameters settings, avoids unpredictable results in the absence of control rules. Taking the roll angle offset of quad-rotor aircraft from 13°to steady state and its stability as an example and simulating with LabVIEW, it is proved that the algorithm efficiency is improved by 50% compared with conventional algorithm, the deviation is less than ordinary PID control which is 0.5°at steady state, and the stability is also perfect.
Key word：
quad-rotor aircraft
digital PID
the conjugate gradient algorithm
self-tuning
LabVIEW
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Adaptive extended Kalman filter algorithm based on BD2/GPS with suppressing multipath

DOI：10.16157/j.issn.0258-7998.2017.02.018

Author：Huang Shuqing1，Hu Fangqiang1，2，Bao Yaping1，Lv Tao1

Author Affilications：1.Department of Computer Science and Technology，Nanjing Tech University，Nanjing 211816，China； 2.School of Electronic Science and Engineering，Southeast University，Nanjing 210096，China

Abstract：When BD2/GPS satellite signal is interfered by multipath，the positioning accuracy of the receiver will be seriously reduced. In order to solve the problem, adaptive R extended Kalman filter（AREKF）algorithm based on BD2/GPS with suppressing multipath is designed. According to the observation error covariance of estimation and error detection, the algorithm can adjust trust level and number of positioning satellite. In addition, analyzing the pseudo-range and doppler residuals effected by multipath, and comparing the positioning performance in the complexly dynamic traffic using EKF with AREKF，the experiment result shows that AREKF can effectively suppress multipath and significantly improve the positioning accuracy and reliability.
Key word：
BD2/GPS
multipath
AREKF
residuals
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Development of Doppler radar velocity measuring system based on apFFT time-shift phase difference algorithm

DOI：10.16157/j.issn.0258-7998.2017.02.019

Author：Zhang Ming，Chen Xing，Wang Yufei

Author Affilications：School of Electronic and Information Engineering，Beihang University，Beijing 100191，China

Abstract：In order to achieve precise velocity measurement of Doppler radar, utilizing time-shift phase difference algorithm based on initial phase invariant characteristics of apFFT(all phase FFT, all phase fast Fourier transform)， using FPGA as data processing platform, this paper achieves signal sampling and storing, windowing, spectral transform , spectrum analysis and phase calculation. The results of processed data are transferred to the PC via Ethernet. Then GUI visual interface of MATLAB is used to observe and analyze the data. The results show that in the condition of 200 kS/s sampling rate and 2 048 points spectrum analysis, the speed error can be accurate to thousandth, so the scheme can achieve high-precision velocity measurement.
Key word：
apFFT
time-shift phase difference algorithm
FPGA
radar velocity measurement
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The design of adaptive real-time edge detection system

DOI：10.16157/j.issn.0258-7998.2017.02.020

Author：Li Jinming，Gao Wengang，Zhang Huwei，Wu Zhengyang

Author Affilications：National Kay Laboratory for Electronic Measurement Technology，North University of China，Taiyuan 030051，China

Abstract：Aiming at the problem that the traditional edge detection system is lack of adaptive and poor real-time performance, an adaptive real-time edge detection system is designed by using the high speed parallel processing ability of FPGA and the improved Canny operator. The system extracts the high threshold value of Canny operator according to the characteristic of the amplitude gradient histogram, and extracts edge information by double threshold processing. At the same time,it converts floating point number into integer to improve the processing speed by multilevel pipelining and parallel processing. The experimental results show that the system can extract complete edge and has the characters of good real-time performance and strong adaptive ability.
Key word：
edge detection
adaptive
Canny operator
gradient histogram
parallel processing
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Communication and Network

The application of the FastICA denoising in power analysis

DOI：10.16157/j.issn.0258-7998.2017.02.021

Author：Wang Jianxin，Li Dongxu，Cui Qi，Xiao Chaoen，Tao Yongyong

Author Affilications：Department of Electronics and Communication Engineering，Beijing Electronic Science & Technology Institute，Beijing 100070，China

Abstract：This paper proposed a novel signal processing method to improve the signal-noise ratio(SNR) of power analysis based on independent component analysis(ICA).In this experiment, fast fixed-point algorithm(FastICA) was employed to de-noise the collected power data with the established side channel analysis platform, and the experimental result showed a 19 dB increment of SNR. Finally, an optimization method by changing g function was proposed, and de-noise capabilities were analyzed. The result demonstrated that the SNR of the algorithm with changed g function increased by more than 4 dB compared with the previous one.
Key word：
independent component analysis
power analysis
FastICA
signal-noise ratio
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Design of a 433 MHz miniaturized spiral printed antenna

DOI：10.16157/j.issn.0258-7998.2017.02.022

Author：Yan Dong，Wang Pengfei，Li Shuaiyong，Wang Ping，Wang Peng

Author Affilications：Key Laboratory of Network Control & Intelligent Instrument，Ministry of Education， Chongqing University of Posts and Telecommunications，Chongqing 400065，China

Abstract：A 433 MHz miniaturized spiral printed antenna is designed using the antenna alignment form of microstrip line imitates spiral antenna on the medium substrate. It reduces the size of the antenna structure. The main parameters of the antenna structure are analyzed and optimized by using simulation software HFSS, and the parameters of optimal antenna structure are derived. Then the performance of the antenna impedance is improned by the method of loading a passive lumped element. Meanwhile, the return loss and the gain are studied in this paper. The simulation results reveal that the return loss is less than -10 dB in the effective bandwidth of 3.4 MHz, the return loss is -24 dB and the effective gain is -4.14 dB on the resonant frequency of 433 MHz.
Key word：
double-deck spiral structure
printed antenna
return loss
gain
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The digital modulation recognition technique based on the wavelet envelope difference

DOI：10.16157/j.issn.0258-7998.2017.02.023

Author：Wang Lanxun，Guo Shuting，Jia Cengjuan

Author Affilications：College of Electronic and Informational Engineering，Hebei University，Baoding 071002，China

Abstract：Aiming at the problem that the digital signal modulation mode is difficult to be accurately identified in communication system,according to the digital signal wavelet amplitude difference between before and after the normalized,this paper puts forward a recognition algorithm based on the wavelet variation coefficient difference and similarity feature. Four kinds of digital modulation signals of MASK, MFSK, MPSK and MQAM are classified in this paper. Theoretical analysis and simulation experiment shows that the recognition method is simple,the application scope is wide and the digital modulation signal recognition rate is higher than 92.39% when SNR is larger than 2 dB.
Key word：
modulation recognition
wavelet transform
variation coefficient difference
similarity measuring function
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Two-way relay performance analysis under finite buffer

DOI：10.16157/j.issn.0258-7998.2017.02.024

Author：Shen Weiwei，Li Min，Chen Lin

Author Affilications：School of Information Engineering，Suqian College，Suqian 223800，China

Abstract：Network coding can be used to reduce the transmission time slot in the two-way relay network and improve the spectrum utilization, however the buffer allocation is still an open problem in the practical two-way relay network. A practical two-way relay strategy is proposed which considered the lossy link, finite relay buffer and signaling overhead. Markov model is used to derive the closed-form expressions for throughput and queuing delay. Monte-Carlo simulation presents that this analytic results match the simulations closely. This model is useful to configure a reasonable buffer size for the practical system, to improve the throughput under the constrained delay.
Key word：
two-way relay
finite buffer
signalling overhead
Markov
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Secure energy-efficiency analysis for collaborative decode-and-forward relay networks

DOI：10.16157/j.issn.0258-7998.2017.02.025

Author：Li Yan，Yang Shouyi，Shi Lulu，Zhang Ruizhe

Author Affilications：School of Information Engineering，Zhengzhou University，Zhengzhou 450001，China

Abstract：Based on the theory of physical layer security, this research analyzes the secure energy-efficiency in collaborative decode-and-forward relay network with the existence of eavesdropper. Secure energy-efficiency(EE), which is defined as the secret bits transferred with unit energy, is maximized by power allocation with constrains of maximum transistor power of all nodes and minimum decode rate of relay. To copy with the nonconvexity of objective function, this paper converts the primary problem into simple subproblem to solve through iteration by jointly applying fractional programming and difference of convex functions programming. The simulation results show that the power allocation can significantly improve the secure energy-efficiency of system.
Key word：
collaborative communication
decode-and-forward(DF)
secure energy-efficiency
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Multi-slot fusion based clear channel assessment algorithms for LTE-U systems

DOI：10.16157/j.issn.0258-7998.2017.02.026

Author：Zhao Sicong，Huang Lei，Shen Bin

Author Affilications：Key Lab of Mobile Communication Technology，Chongqing University of Posts and Telecommunications，Chongqing 400065，China

Abstract：Recently, a new technology called LTE-U proposed by 3GPP is under study. It aims to relieve the pressure in demanding more licensed spectrum. The coexistence mechanisms research between LTE-U and WiFi in the same band is one of the research hotspot. This paper first established a Clear Channel Assessment(CCA) model of the system, and then presented a LBT based Multi-Slot CCA scheme. Based on the proposed scheme, four soft data fusion algorithms were proposed. In order to reduce the complexity of decision，it introduced the hard decision fusion scheme and obtained the optimal decision fusion rule mathematically. Theoretical analysis and experimental results verify that the proposed algorithm can make the CCA become more flexible and improve the accuracy of spectrum sensing and efficiency of coexistence.
Key word：
LTE-U
clear channel assessment
LBT
coexistence
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Research of energy efficient prediction clustering algorithm for multilayer wireless heterogeneous sensor networks

DOI：10.16157/j.issn.0258-7998.2017.02.027

Author：Liu Jing1，2，Fan Jianxi2

Author Affilications：1.Software and Service Outsourcing Institute，Chien-shiung Institute of Technology，Taicang 215411，China； 2.School of Computer Science & Technology，Soochow University，Suzhou 215006，China

Abstract：In designing wireless sensor networks, it is important to reduce energy dissipation and prolong network lifetime. It puts forward an energy-efficient prediction clustering algorithm, which is adaptive to sensor networks with energy and objects heterogeneous. This algorithm enables the nodes to select the cluster head according to factors such as energy and communication cost, thus the nodes with higher residual energy have higher probability to become a cluster head than those with lower residual energy, so that the network energy can be dissipated uniformly. In order to reduce energy consumption when broadcasting in clustering phase and prolong network lifetime, an energy consumption prediction model is established for regular data acquisition nodes. Simulation results show that compared with current clustering algorithms, this algorithm can achieve longer sensor network lifetime, higher energy efficiency, and superior network monitoring quality.
Key word：
WSN
energy-efficient
heterogeneous sensor networks
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Computer Technology and Its Applications

Research on optimization of high power laser welding parameters of warship-used steel

DOI：10.16157/j.issn.0258-7998.2017.02.028

Author：Liu Yuqing，Tang Jinping，Hua Liang，Zheng Changwei

Author Affilications：School of Electrical Engineering，Nantong University，Nantong 226019，China

Abstract：For the characteristic of non-linear, multivariable coupling and uncertainty of high-strength low-alloy steel in high power laser welding process, a monitoring system based on acoustic signal acquisition was built, real-time acquisition of the sound was achieved, feature vector was extracted, and Double Weights Neural Network(DWNN) model was constructed. Excellent nonlinear fitting ability of DWNN was used to build the nonlinear mapping neural network model between multiple parameters and sound signals. DWNN has higher fitting accuracy and less iteration than traditional radial basis function network(RBF) in the same size, which provides good foundation to parameters optimization and control of high power laser welding.
Key word：
laser welding
double weights neural network
acoustic signal
feature extraction
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The positioning device for the detection system of the frame number area hidden weld

DOI：10.16157/j.issn.0258-7998.2017.02.029

Author：Wang Jiajun1，Yang Lu1，Han Zhiyi2，Zhao Xin2

Author Affilications：1.National Key laboratory for Electronic Measurement Technology，College of Information and Communication Engineering， North University of China，Taiyuan 030051，China； 2.Taiyuan Municipal Public Security Bureau，Taiyuan 030051，China

Abstract：For the integrity detection process of the frame number area，the existing technology can not in real time and accurately obtain the location of detection area hidden weld, an idea that ordinary optical mouse is mapped to the virtual position sensors was proposed. By writing HID class lower filter drivers to turn a USB optical mouse into a custom device，the application is able to access the standard mouse, and by reading the report descriptor of the mouse，the position information is gotten. After transformation, the position sensor has positioning error of less than 0.3%, fully meets the position information accuracy requirement of the detection system.
Key word：
the frame number area
hidden weld
optical mouse
position sensor
filter drivers
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Parameters optimization research of relevance vector machine based on LFOA

DOI：10.16157/j.issn.0258-7998.2017.02.030

Author：Lv Yan，Fang Liqing，Zhao Yulong，Zhang Qiantu

Author Affilications：Department of Artillery Engineering, Ordnance Engineering College，Sijiazhuang 050003，China

Abstract：The parameter of kernel function influences the integrative performance of relevance vector machine(RVM) gravely. In order to improve the classify performance of relevance vector machine, a method based on LFOA was proposed to optimizing the RVM kernel parameters. By fitness function evaluation, the fruit fly group began a global search for the kernel parameters in the specified range through several Levy flight and iteration. The effectiveness of the algorithm is verified with MATLAB simulation experiment through four UCI standard database set and the method can improve the classification ability of RVM. Comparing with other algorithms, the algorithm has better testing precision and stability.
Key word：
RVM
parameters optimization
fruit fly optimization algorithm
Levy flight
View(12394)

Design and implementation on section simulation system of CTCS-2

DOI：10.16157/j.issn.0258-7998.2017.02.031

Author：Xiong Wei1，He Tao2，Kuang Wenzhen2

Author Affilications：1.Key Laboratory of Opto-electronic Technology and Intelligent Control of the Ministry of Education， Lanzhou Jiaotong University，Lanzhou 730070，China； 2.School of Automatic & Electrical Engineering, Lanzhou Jiaotong University，Lanzhou 730070，China

Abstract：Chinese Train Control System(CTCS) is a hierarchical system which can meet the transport requirements of different lines and ensure the safe operation of the train. The control system in working condition cannot reach the demonstration and practice requirement of the new staffs. In order to solve this problem, in this thesis, a simulation program of CTCS-2 level train control system was proposed by the combination of software and hardware, and the section simulation system of CTCS-2 was selected as the analysis object. The software implementation schemes of subsystem functions were proposed in accordance with the requirements of the relevant norms and detailed functional analysis, and then the function modules in detail were given and MFC of Microsoft Visual Studio 2005 was used to realize the software.
Key word：
CTCS-2
train control system
functional analysis
software implementation
View(9966)

An optimal multi-class SVM combined with graph model and its application on intelligent transportation

DOI：10.16157/j.issn.0258-7998.2017.02.032

Author：Wang Jian1，Zhang Weihua2，Li Yuexin3

Author Affilications：1.School of Computer Science & Engineering，Changshu Institute of Technology，Changshu 215500，China； 2.Department of Information Engineering，Zhengzhou Chenggong University of Finance and Economics，Zhengzhou 450000，China； 3.School of Computer Science and Information Engineering，Hubei University，Wuhan 430064，China

Abstract：In order to improve the classification accuracy of multi-class support vector machine classifier for multi-target, an optimal multi-class support vector machine classifier combined with undirected graph mode is proposed. First, it uses the cosine measure to compute the similarity of training data, and builds undirected graph mode containing training data and the similarity matrix, and calculates a constrained similarity matrix. Then, it introduces the constrained similarity matrix to the objective function for computing multi-class support vector machine, and builds the optimal multi-class support vector machine classifier. Finally, it applies the optimal multi-class support vector machine classifier to the field of intelligent transportation, for detecting objects of pedestrians and vehicles with features of histogram of oriented gradient. Experiments show that the error rate for detecting pedestrians and vehicles with the new method is lower than classic multi-class support vector machine classifier and the present mainstream object detection methods.
Key word：
undirected graph mode
support vector machine
multi-class support vector machine
similarity
object detection
View(8550)

Power Supply Technology and Its Application

Design of digital phase-locked loop based on transformer

DOI：10.16157/j.issn.0258-7998.2017.02.033

Author：He Songyuan1，Chen Rong1，2

Author Affilications：1.School of Electrical and Information Engineering，Jiangsu University，Zhenjiang 212013，China； 2.School of Electrical Engineering，Yancheng Institute of Technology，Yancheng 224051，China

Abstract：A novel digital phase-locked loop was realized based on transformer combined with the method of predictive current deadbeat improved decoupling control, aiming at the problem of traditional analog phase-locked loop with low precision and slow speed. which can solve the problem of phase locked. The digital phase-locked loop can follow the voltage phase quickly and accurately when grid voltage changes, good performance in phase locked of the control method are verified by simulation and experimental results.
Key word：
transformer
deadbeat
phase-locked loop
inverter
View(8468)

The research of battery pack balancing with LCD absorbing network

DOI：10.16157/j.issn.0258-7998.2017.02.034

Author：Liu Xintian，Cheng Weijing，He Yao，Zheng Xinxin，Zeng Guojian

Author Affilications：New Energy Automotive Engineering Research Institute of Hefei University of Technology，Hefei 230009，China

Abstract：The balance of electric vehicle batteries is the key technology which can guarantee the reliability of the battery system. It can improve the life cycle and energy utilization of the batteries. A flyback balancing topology with LCD absorbing circuit which can realize soft switching is given. Thus the efficiency of the balancing topology can be improved. The working principle of balancing topology and the process of soft switching is analyzed. The corresponding control strategy of the balancing topology is proposed and the timely balance can be realized. The theoretical analysis is verified by simulation and experimental results.
Key word：
electric vehicle
battery balancing
flyback transformer
LCD absorbing circuit
View(7414)

A novel interleaved flyback micro-inverter with power decoupling

DOI：10.16157/j.issn.0258-7998.2017.02.035

Author：Gu Shilei1，Sun Yukun1，2，Zhang Liang2，Huang Yonghong1

Author Affilications：1.School of Electrical and Information Engineering，Jiangsu University，Zhenjiang 212013，China； 2.Nanjing Institute of Technology，Nanjing 211100，China

Abstract：A novel interleaved flyback micro-inverter with power decoupling is proposed in this paper. This system is composed of interleaved flyback converter, DC/AC inverter circuit and LC filter circuit. Having the characteristics of low capacitance value and long life, the two film capacitors are paralleled to the two ends of the DC bus to improve the conversion efficiency. The novel topology is analyzed in details in this paper. This paper introduces the working process of micro-inverter in different modes, and give the control scheme. At last, the proposed topology is validated by the MATLAB simulation. and a 250 W micro-inverter prototype is built to verify it. Experiment shows that the maximum conversion efficiency of the inverter is 90.6%.
Key word：
interleaved flyback
conversion efficiency
power decoupling
film capacitor
View(9188)

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