Home > Archive > 2013 No. 10

2013 No. 10

Publish Date：2013-10-06
ISSN：0258-7998
CN：11-2305/TN
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Embedded Technology

Research of instruction code compression based on high-performance BWDSP processor

Author：Hong Xingyong1，Hong Yi1，2，Li Wenjin3，Jiang Zhixiong1

Author Affilications：1.No.38 Research Institute, China Electronics Technology Group Corporation, Hefei 230031，China； 2.School of Computer and Information, Hefei University of Technology, Hefei 230009，China； 3.School of Electronic & Communications Engineering, Anhui Xinhua University, Hefei 230088，China

Abstract：The DSP processor is becoming more and more powerful, and the software program complexity is also increasing and software code volume increases rapidly. The binary machine instruction codes which are generated by the compiler and assembler are compressed by LZW compression technique. The code compression can reduce instruction code storage space size, so that the DSP processor with limited storage space can store more instruction code, while increasing the Cache hit rate and improving the overall performance of the BWDSP processing. The code compression system of the digital signal processor(BWDSP) uses the LZW dictionary compression algorithm to compress each instruction cache line. The experiments on the high performance BWDSP simulator show that the code compression system of BWDSP can achieve average compression ratio 60% on typical radar signal processing programs.
Key word：
code compression
BWDSP
instruction Cache
LZW
View(6370)

Study on FBG sensing demodulation system based on ARM

Author：He Yujun，Lu Dan，Yin Chengqun，Hu Lizhang

Author Affilications：Department of Electronic and Communication Engineering, North China Electric Power University，Baoding 071003，China

Abstract：In order to further improved detection method of fiber bragg grating(FBG) center wavelength,combined with the currently popular embedded technology,an FBG sensor signal processing systems based on ARM has been designed，which includs data acquisition, data processing and data storage module. The function like data acquisition,the center wavelength detection, data display and save of FBG reflection spectrum signal can be finished. The system is programmed using the C language,and is tested on the hardware platform. The results show that the required relevant function for the FBG wavelength detection of the system can be completed. Meanwhile，speed and accuracy of demodulation have been improved. A good reference has been provided for the implementation of the low-cost and miniature of FBG sensing system based on ARM.
Key word：
FBG
ARM
demodulation
filter
fitting
View(7612)

Porting and application of μC/OS-III on MSP430F5529

Author：Wang Chengyi

Author Affilications：School of Electronic Engineering, Hubei University of Economics, Wuhan 430205，China

Abstract：Based on MSP430F5529 and related peripheral circuits, this paper systematically analyzes the structure of μC/OS-III and intruduces the main work of porting. By designing a multifunctional anti-theft window controller as the object, the paper also describes the relationship of the function of the application system and multitasks，and proves the fact that the porting μC/OS-III can be put into use and practice.
Key word：
μC/OS-III
MSP430F5529
porting
task oriented
application
View(6932)

A solulion of saving baseband NV data in Android system

Author：Huang Yifeng，Huang Junwei，Wu Lian

Author Affilications：Chongqing Next Generation Mobile Communication Terminal Laboratory，Chongqing University of Posts and Telecommunications， Chongqing 400065，China

Abstract：A method solution of saving the baseband NV data in Android cellphone is designed and realized. It includes the general framework of the design，data receiving and saving workflow of the AP part,NV data sending process in CP part，and the design of the enhanced IIC communication mechanism. Then the method is implemented on the hardware system with Cortex A9 Quad-core AP chip and ARM9 CP chip.The results of implementation show that this method has a high efficiency and good reliability to export baseband NV data. It is adequate for commercial products.
Key word：
Android operating system
baseband NV data
IIC communication
IPC
data packet
View(19260)

Design of ship fuel management system based on ARM and 3G

Author：Cheng Hang1，Yue Rui2，Jin Xiaolong3

Author Affilications：1.Faculty of Mechanical & Electronic Information，China University of Geosciences, Wuhan 430074，China； 2.Hubei Provincial Institute of Electronic Science Co.，Ltd.，Wuhan 430061，China； 3.Wuhan Urban Road & Bridge Toll Management Center，Wuhan 430050，China

Abstract：In accordance with the need of fuel management for dual-fuel ships that work on the water, a fuel management system based on ARM and 3G network is designed. The 3G network, combined with VPN technology, is used to solve the problem of communication between the ships and the ship management center. Taking advantages of the ARM serial port and GPIO port, the acquisition of fuel usage and security status is realized. By using a network DVR on the ship as a video server, the center can achieve real-time monitoring of the ship scene. The experiments show that the system has advantages of good reliability and real-time performance.
Key word：
ARM
3G network
fuel management
VPN
real-time monitoring
View(5092)

A new type of UHF reader with solar charge and wireless communication

Author：Tian Ye，Zhang Hongyu

Author Affilications：College of Electronic Engineering，University of Electronic Science and Technology of China， Chengdu 611731，China

Abstract：RFID is one of the key technologies of the Internet of Things, and UHF(860 MHz to 960 MHz) radio frequency identification system is relatively mature in RFID system. A new type of UHF reader with solar charge and wireless communication has been proposed in this paper. The PLL of LPC2138 can reach to 60 MHz and so the chip has good ability in data processing. μCOS-II is been selected to meet the UHF reader′s multiple tasks requirements. CN3722 is a solar energy collection chip, it combined with TP4056 to complete the task of lithium battery charging. Bluetooth module is used to realize wireless communication.
Key word：
RFID
UHF reader
solar charging technology
μCOS-II
View(6732)

Design of tower crane surveillance system based on ARM11

Author：Wang Xu，Zhang Zijia，Wang Huimin

Author Affilications：School of Information Science & Control, Nanjing University of Information Science & Technology, Nanjing 210044，China

Abstract：The tower crane operators frequently meet with visual blind spot when they operate the tower crane, so they have difficulties in grasping the hook height, and they operate the machine only according experiences and sensation. In this way, it is easily to lead security incidents. System makes use of S3C6410 microprocessor chip as the core, to build a monocular distance monitoring system, combine with the shape and color characteristics of the crane hook, and then accomplish the detection about the hook dropping distance based on the principle of monocular distance. Finally, achieve the real-time video transmission through WiFi wireless module. The experimental results show that the video transmission is stable and reliable, and the monocular rangefinder is relatively accuracy. It can meet the need of crane drivers who require for the real-time video and height.
Key word：
embedded
Video transmission
monocular distance
WiFi
View(6722)

Application of Integrated Circuits

Design of echo-based self-adjusting range-gated controller using FPGA

Author：Tan Juqin，Chen Hejuan

Author Affilications：School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094，China

Abstract：A echo-based self-adjusting range-gated controller using FPGA has been designed to solve interference between multiple active ultrasonic detectors aiming at the same targets. With distance information extracted from the echo, the controller adjusts gate so that interference of adjacent detectors could be suppressed. The system was designed with hardware description language and finite state machine methods. Simulation results show that the structure of the controller is simple, facilitating the system to detect and identify target quickly and reliability with better anti-interference performance. The control system operating frequency is up to 194.4 MHz.
Key word：
FPGA
echo
self-adjusting
range-gate
active ultrasonic detection
View(12934)

Orthogonal wavelet transform implementation using switched current circuits

Author：Hu Qinchun

Author Affilications：Department of Electrical and Electronic Engineering, Chengdu Technological University，Chengdu 611730，China

Abstract：The realization of orthogonal wavelet transform, based on Laguerre structure, using switched current circuits is proposed in this paper. The Laguerre structure implements a cascade of delay operators, which can generate approximations of a signal at different resolutions. Therefore, it is able to realize orthogonal wavelet transform. Orthogonal wavelet transform based on Laguerre structure is realized by switched current circuits. Its good performance is verified by simulated results.
Key word：
orthogonal wavelet transform
Laguerre structure
switched current
View(4096)

Research on the data acquisition module of the ball mill group monitoring system

Author：He Fangwei1，Wang Huan1，Xu Xin1，Liu Bingyu1，Jiang Shanhong1，Yin Qingfang1，Wang ChunYan2

Author Affilications：1.Ansteel Mining Company，Anshan 114000，China； 2.Telecommunications Institute，Liaoning University of Science and Technology，Anshan 114000，China

Abstract：For mining enterprises, the data detection techniques are implemented by using analog transmitter. But there are some shortcomings. In this case, the data acquisition module is designed. The module has small size, flexibility, maneuverability, versatility, intelligence and other characteristics,which is the ideal device for data monitoring and controlling of network intelligence.
Key word：
ball mill group
analog transmitter
data acquisition
data acquisition monitoring module
network intelligence data monitoring and control
View(4558)

The broadband frequency voltage conversion circuit based on LM331

Author：Zhang Weizhao，Ma Shengqian，Ran Xingping

Author Affilications：College of Physics and Electronic Engineering, Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province，Northwest Normal University，Lanzhou 730070，China

Abstract：This paper puts forward a divider circuit and amplifier circuit. It can extend the frequency range of the input signal of the frequency-to-voltage conversion circuit LM331 constituted, has realized 1 kHz to 30 MHz signal processing. The circuit has simple structure, low cost, low consumption, and solves the problem that the signal frequency range is too wide to be processed in many applications areas.
Key word：
frequency-to-voltage conversion circuit
broadband
frequency division
amplification
LM331
View(12108)

Design on low-voltage and high-power motor drive system of special robot

Author：Liu Xiong，Lin Maosong，Liang Yanyang

Author Affilications：Robot Technology Used for Special Environment Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010，China

Abstract：Nuclear radiation emergency handling robot drive system requires small size, strong driving ability and flexible control. On the basis of using IR2184 driving H-bridge built by paralleling MOSFET, this paper designs a large-current motor driver design, which can be applied to special robot. RCD snubber circuit is designed to solve the spike problem, and the current sharing protection circuit is designed to solve current sharing problem among the paralleling MOSFET. Experiments show that this design can achieve a driving voltage of 24 V, the drive current up to 100 A, finally achieve a reliable control of the special robot.
Key word：
low-voltage high-power
paralleling MOSFET
RCD snubber circuit
current sharing protection circuit
View(10632)

Design and research for automobile accelerator pedal based on MLX90316

Author：Chen Keqiu，Liu Pengyi

Author Affilications：Laboratory of Siyuan，Department of Physics，Jinan University, Guangzhou 510632，China

Abstract：An automobile accelerator pedal system is designed by using a set of three axis Holzer element MLX90316. This paper describes the sensor′s principle and structure, and researches its independent linearity, repeatability and consistency. The result shows that the sensor uses a disk-shaped magnet with the horizontal flux is 50 mT, and the distance between magnet and chip is 5 mm, when the magnet′s rotating speed is 50～300 r/s, the sensor independent linearity is less than 1.05%, the D-value of the same sensor′s repeatability is 0.02%，and the D-value of the same batch of sensor′s consistency is less than 0.04%.
Key word：
MLX90316
automobile accelerator pedal
the independent linearity
View(10008)

Design and implementation of double-T filter based on FPGA

Author：Li Zhe1，Gao Bo1，Ma Jiajun2

Author Affilications：1.School of Electroic Engineering，Xi′an University of Posts and Telecommunications，Xi′an 710061，China； 2.School of Technical Physics，Xidian University，Xi′an 710071，China

Abstract：Aiming at improving the demodulating efficiency of phase-sensitive signal in the prism-type digital laser gyro stable optical path circuit , the double-T filter digitalization, which is used in narrow bandwidth with larger-increasing amplitude and less-fluctuation signal, is applied in the digital laser gyro demodulating circuit in this paper. The band-pass filter with the bandwidth of 2 Hz is obtained by designing algorithm based on FPGA. The contrast experiment is implemented in the digital laser gyro, and the system verification shows that the double-T filter has a 200% improvement at the signal-to-noise ratio when comparing with the IIR filter.
Key word：
laser gyro
double-T filter
FPGA
filter
View(13808)

Information Security

Investigation of high order DPA against cryptographic algorithm

Author：Zhao Dongyan，He Jun

Author Affilications：Beijing NARI SmartChip Microelectronics Company Limited，Beijing 100192，China

Abstract：Differential power analysis is a powerful attack against cryptographic algorithms. An effective protection method is to mask the intermediate data during calculation. However, cryptographic algorithms with masking technology are still susceptible to high order DPA. Compared with normal DPA, there are more difficulties to be solved in high order DPA such as correct attack modeling, right choices of attack points, right construction of composition function and ways of improving s/n rate, etc. In this paper, by analyzing a classic masking scheme, we will demonstrate how to solve the difficulties mentioned above during a high order DPA attack, and then verify it on a hardware-implemented cryptographic coprocessor.
Key word：
high order DPA
differential power analysis
side channel analysis
View(8002)

Design and implementation of secure terminal in mobile Internet

Author：Tu Jing，Tian Zengshan，Zhou Fei

Author Affilications：Institute of Wireless Location and Space Measurement, Chongqing University of Posts and Telecommunications, Chongqing 400065，China

Abstract：In the confidential application like government and finance, a mobile internet terminal used for secure communication was designed to deal with the problem of data theft, data tampering in communication, network attacks and privacy data leak, aiming to protect transmission security, network security, as well as storage security of a terminal.
Key word：
mobile Internet terminal
IPsec
firewall
IDS
View(6140)

Study on a method of video-in-video based on encoding

Author：Zhu Lihong，Zhou Quan

Author Affilications：National Key Laboratory of Space Microwave Technology, China Academy of Space Technology, Xi′an 710100，China

Abstract：In order to solve the less embedding frames in the existing video-in-video algorithm, a novel video-in-video method is proposed ,which makes use of encoding and robust information hiding technology. Encoding is utilized in the proposed method to improve the error resilience performance of secret video. And then, the secret information is embedded into the frequency domain of the host video to further enhance reliability of the proposed method. The simulation results indicate that the mixed video signal, which is embedded with secret video, has transparent feature, imperceptibility and high security. Compared with the original algorithm, the proposed method increases the quantity of embedding frames and improves the quality of secret video. Covert communication of secret video based on video is achieved.
Key word：
encoding
covert communication
video-in-video
data hiding
robust
View(5466)

A word-level multiplier using optimal normal basis type II over GF(2m)

Author：Ni Le，Chen Tao，Dai Zibin，Li Miao

Author Affilications：Information Engineering University，Zhengzhou 450004，China

Abstract：In this paper, based on the research of optimal normal basis type II and reordered normal basis, a high-speed architectures for GF(2m) field multiplication using reordered normal basis are proposed. Complexity comparison shows that the proposed architectures are faster compared to previously presented architectures. One advantage of the new word-level architectures is that the critical path delay is a constan. This enables the multipliers to operate at very high clock rates regardless of the field size or the number of words.
Key word：
finite field
optimal normal basis type II
reordered normal basis
word-level multiplier
View(12062)

Measurement Control Technology and Instruments

Design of remote data receiver based on Web and nRF24L01

Author：Yan Linxiang, Zhang Hongyu

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

Abstract：A remote data receiver is designed based on S3C2440-Linux embedded platform and nRF24L01 RF module. The data receiver uses SQLite3 to store the data which are received by nRF24L01 RF module from the data acquisition node. Through browser user can access to the BOA server for data management. In CGI program, commands were passed to RF receiving by Posix message queues. Multithreading technology was used to process the received data. The approach of using 2.45 GHz wireless RF module to pass the data which are acquired by sensors to the data receiver is well suited for remote environmental monitoring, tourism management and other occasions.
Key word：
data receiver
nRF24L01 RF module
CGI program
multithread
Posix message queues
View(6966)

The design of intelligent concentrator based on MBUS

Author：Luo Yonggang1, Zou Zhiyuan2

Author Affilications：1. College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China; 2. Shandong Bellin Technology Co. Ltd, Zibo 255000, China

Abstract：Aimming at centralized meter reading system focused around the intelligent water meter and heat meter, a kind of MBUS concentrator is designed. The MBUS concentrator can complete the collecting of the intelligent meter data that connects to the MBUS bus and the uploading to the monitoring computer via GPRS. In the paper the working principle of the concentrator and MBUS bus are introduced, and the transceiver circuits of the MBUS bus signals are described in detail. Because of the use of the single-chip control, the bus voltage can be detected real-time, the reference voltage of the comparator can be adjusted constantly, so the adaptability of the MBUS receiving circuit increases greatly. The test results show that the concentrator that has been realized has high reliability, strong load ability and high reading efficiency. And it has achieved very good effects in the practical application.
Key word：
concentrator
MBUS
GPRS
View(27502)

An electronic nose system based on the algorithm of PCA and LVQ hybrid neural network

Author：Wen Zhengying, Mi Jie

Author Affilications：Department of Computer Science and Engineering, Henan Institute of Engineering, Zhengzhou 450007, China

Abstract：In order to evaluate the food quality without contacting, an electronic nose system composed of acquisition model, controller model and host computer is designed and developed based on six kinds of Figaro metal-oxide semiconductor sensor array, which can test the food without destructing. The Principal Component Analysis (PCA) and Learning Vector Quantization (LVQ) hybrid neural network pattern recognition algorithms are utilized in the proposed system to analyze the fingerprint database of gas. The experimental results show that this instrument can detect five different types of sauces accurately and is capable of distinguishing unknown sauce.
Key word：
sensor array
principal component analysis
learning vector quantization
hybrid neural network
electronic nose
View(7116)

Development of BCU automatic test system based on virtual instrument

Author：Gao Xiaoyan1, Ding Guojun2

Author Affilications：1. Hebei Jiaotong Vocational & Technical College, Shijiazhuang 050035, China; 2. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Abstract：As the key control equipment of the Electric Multiple Units (EMUs) braking system, the brake control unit has significant impact on safe and stable of train. Brake control unit circuit board automatic test system is designed based on current sensor and virtual instrument. Mature sensor technology, signal conditioning circuits design and graphical programming language of LabVIEW are applied to the automatic test system. The principle structure of system, hardware and software design and experimental test are descripted in detail. The field test result indicates that the system can greatly improve test accuracy and efficiency with good usability and scalability.
Key word：
automatic test system
PCB board
virtual instrument
current sensor
View(7676)

Design of an in-situ detection equipment based on embedded platform

Author：Lu Jianhua1, Wu Xiaonan1, Chen Wanyong2, Wang Xinhua3

Author Affilications：1. Department of Control Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China; 2. The 92653th Unit of PLA, Qingdao，266041, China; 3. The 92742th Unit of PLA, Shanhaiguan 066203, China

Abstract：Aiming at the problem existing in aero motor testing equipment, such as big volume/weight and low integrated, which resulting in the equipment’s low flexibility, this paper puts forward a design scheme of in-situ detection equipment based on embedded platform. The hardware and software platform were established, the hardware and software design were proposed. Practical application shows that the newly developed device is not only fully functional, stable and reliable, but also has advantages of portable, intelligent and high integration.
Key word：
embedded platform
aeromotor
insitu detection
View(5584)

Development of hand-held fault diagnosis on HEV power batteries

Author：Xiao Guangbing1,2, Sun Ning1, Chen Yong2, Chen Ning2

Author Affilications：1. College of Automobile and Traffic Engineering, Nanjing Forestry University, Nanjing 210037, China; 2. College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China

Abstract：A handheld HEV power batteries fault diagnosis based on wireless sensor network is designed, mainly including a wireless transmission module using ZigBee protocol stack processor, STM32F103VB micro-computer, battery monitor module, touch screen and wireless printer, etc. The hardware and software design for the handheld fault diagnosis is introduced in detail to realize the online monitor and fast fault diagnosis on HEV batteries. The instrument analyzes and forecasts the battery states，and provides early warning information for the battery maintenance and replacement．
Key word：
power batteries
fault diagnosis
wireless sensor network
STM32F103VB
View(5118)

Study of indoor localization technique based on WSN

Author：Sun Feng， Shi Weibin， Huang Lingfeng

Author Affilications：School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Abstract：This thesis aims to study the localization methods which are based on distance estimation technique. For the radio signal is sensitive and the hardwares of nodes are different from one another, this paper proposes a scheme of finding the distance estimation model for every node. The position of the unknown node can be estimated by linear localization or maximum likelihood estimation algorithms. The authors conducted experiments to analyze errors of the distance-estimation model and compare the errors of the two different algorithms. And put forward the strategy of the integrated use of two localization algorithms.
Key word：
wireless sensor network(WSN)
RSSI
localization algorithm
range distance estimation error
View(7236)

Communication and Network

The stable clustering algorithm applying to VANET

Author：Xu Zhen, Huang Qiong, Tang Lun, Chen Qianbin

Author Affilications：Chongqing Key Lab of Mobile Communications Technology，Chongqing University of Post and Communications, Chongqing 400065, China

Abstract：In Vehicular Ad Hoc NETwork(VANET), network topology changes rapidly and link is not unstable. If the clustering algorithm of mobile ad hoc networks is directly used, a series of problems occur. For instance, transmission delay increases and package loss goes up. This paper presents a kind of improved and stabilized clustering algorithm based on AP similarity—SD clustering algorithm. The algorithm is based on similarity between nodes and node degree all round carries out cluster head elections, and takes advantage of geographical position information of nodes and neighbor topology information. The result of NS2 simulation shows that the algorithm could effectively improve the stability of cluster structure in VANET.
Key word：
VANET
affinity propagation(AP) algorithm
cluster head geographical position
SD algorithm
View(7454)

Research about handover from Macrocee to Femtocell in the TD_LTE

Author：Li Xiaowen，Shao Mingmiao

Author Affilications：Department of Communication and Information Systems,Chongqing University of Post and Telecommunications,Chongqing 400065,China

Abstract：When users handover from a Femtocell to Amacrocell,it is possible to arouse unnecessary handover.At the same time,3GPP suggested handover process can’t supply services without interruption on the downlink. This paper suggests a method to avoid unnecessary handover and reduce the interruption time.First we judge whether the handover is unnecessary or not.If it is,target cell will refuse the handover request, propose a candidate taret cell,and adjust the related handover parameters.If not,SGW will send the data to both the source and target cell when the handover has started.The simulation shows that this method can tremendously decrease the interruption time and data loss.
Key word：
TD_LTE
handover
Femtcell
View(4442)

Enhanced TCPW scheme based on bandwidth estimation

Author：Jin Linzhu1, Ku Liuheng2

Author Affilications：1. College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; 2. National Computer System Engineering Research Institute of China, Beijing 100083, China

Abstract：TCP Westwood (TCPW) has shown more superior performance than traditional TCP protocol in the error rate is high, unstable bandwidth wireless network environment. But it can not distinguish the reason of packet loss. Its bandwidth utilization, and performance is still insufficient. For this problem, the proposed the TCPW improved algorithm TCPW-J divided the network congestion level based on bandwidth estimation, to distinguish between congestion losses and wireless packet loss. Simulation results show the TCPW-J algorithm improves network bandwidth utilization, and maintains good fairness and friendliness.
Key word：
transmission control protocol
TCP westwood
congestion control
wireless network
View(6624)

An uplink power control algorithm based on equal SINR

Author：Zhang Wenjun1, Zhou Huaibei2, Zhu Xingyu1

Author Affilications：1. School of Physics and Technology, Wuhan University, Wuhan 430072, China； 2. International School of Software, Wuhan University, Wuhan 430072, China

Abstract：For data communication of secondary users in CDMA cognitive radio network, a new uplink power control algorithm was presented without disturbing primary users. The proposed algorithm is based on equal SINR (Signal to Interference plus Noise Ratio) and energy-efficient utility function to solve a corresponding maximization problem. The algorithm is of low complexity and good user fairness, and its power solution is Pareto efficient. The simulation results show that compared with power control based on non-cooperative game, the proposed algorithm can effectively improve energy efficiency of secondary users and reduce the interference upon primary users.
Key word：
CDMA
cognitive radio
equal SINR
utility function
uplink power control
View(5250)

A backoff algorithm of MAC protocol with density prediction and service classification

Author：Su Haiwu, Cheng Lianglun, Gao Rui, Su Xinling, Sun Zhijing

Author Affilications：Faculty of Automation，Guangdong University of Technology，Guangzhou 510006, China

Abstract：In order to improve the performance in high-speed sensor networks which traffic load is high, study backoff algorithm of competitive MAC protocol, and propose a backoff algorithm of MAC protocol with density prediction and service classification which is based on PTTL. The protocol forecasts the number of neighboring nodes by weighted recursive smoothing, to achieve the purpose of the competition window adaptive node density; introducing awareness of the service classification, and giving the right of send priority to the nodes that are the high level of service, or data backlog or multi-hop, to meet the real-time requirements of critical data multi-hop transmission. The NS2 simulation results show that: the network performance of DPSC backoff algorithm in the nodes of high-density and high-load environment is superior to the other three algorithms. The average delay was 10% lower than the PTTL algorithm, throughput increased by 15%, and the average energy consumption decreased by 5%.
Key word：
high-speed sensor networks
backoff algorithm
density prediction
service classification
priority send
View(4888)

Research of secret key rate in the wireless flat fading channel

Author：Cai Wenbing1,2, Zhang Shuilian1, Xin Gang1, Yu Dapeng1

Author Affilications：1. Institute of Information System Engineering, Information Engineering University, Zhengzhou 450002, China; 2. Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China

Abstract：In traditional wiretapping channel models, the legitimate channels are assumed to be completely reciprocal. Besides, the wiretapper can only receive the signals from one side of the legitimate users, which are not in accord with the process of secret key generation. In this paper, the traditional models are improved, on the one hand, the correlation coefficient is introduced to characterize the reciprocal degree of the legitimate channels, on the other hand, the wiretapper is assumed to acquire the information from both the legitimate users. Moreover, the expression of the secret key rate is deduced, the factors affecting the rate are also simulated and analyzed. The results show that the rate is increased with the correlation coefficient of the legitimate channels and SNR, but the rate is decreased when the correlation coefficients of the wiretapper increase.
Key word：
flat fading channels
source of common randomness
channel modeling
secret key rate
View(6798)

A joint frequency synchronization and channel estimation algorithm for 802.11a/g

Author：Lu Xuming, Cai Chunxiao, Tan Hongzhou, He Huijian, Zhang Lihui

Author Affilications：School of Information Science & Technology, Sun Yat-Sen University, Guangzhou 510006, China

Abstract：The 802.11a/g can be used in indoor wireless audio transmission. According to the characteristics of indoor channel, an algorithm, which utilizes training sequence and pilot subcarriers, is proposed for carrier frequency offset estimation, channel estimation and residual phase tracking. The proposed algorithm is low-complexity and can be easily implemented in hardware. The simulations results also show that it has good performance.
Key word：
indoor channel
carrier frequency offset estimation
channel estimation
residual phase tracking
low-complexity
View(3964)

Computer Technology and Its Applications

The research of corporate office network mobile terminal security access technology

Author：Wang Xin1, Zhang Xinwei2

Author Affilications：1. Inner Mongolia Vocational College of Chemical Engineering, Huhehaote 010070, China; 2. National Computer System Engineering Research Institute of China, Beijing 100083, China

Abstract：This paper focuses on the corporate office network access to mobile device security studies of the mobile terminal security access technology, and build security access system architecture. The main objective is to achieve secure access to corporate office network mobile communication network, and realization of corporate office network extends to the mobile terminal equipment. Which provideg security support for mobile office in open network environment.
Key word：
mobile terminal
security access
trusted network
View(4780)

Development of an agriculture experimental field-data acquisition system

Author：Zhou Changming， Liu Peng

Author Affilications：Electronic Engineering College, Chengdu University of Information Technology, Chengdu 610225, China

Abstract：An agriculture experimental field-data acquisition system is developed based on Cloud Servers, with a terminal integrated of the ZigBee coordinator module, GPS module, GPRS module and RFID reading and writing module as medium, based on RFID electronic tags and temperature and humidity sensor distributed in the field. The combination of positioning of GPS and RFID electronic label is carried out on the agriculture experimental field sampling in the plant. ZigBee module is used for coordinating and managing the experimental field temperature and humidity sensors network collects the data through the network. GPRS module is used for the remote communicating and transferring the data between the system and the cloud server. Using embedded QT, it develops an embedded application module, which realizes human-computer interaction and control and manage the terminal. It is proved that this system have reached the design requirements though the simulation of Cloud Server.
Key word：
calibration
location
data collection
Cloud Service
View(8566)

Research and design of medical ward-round system based on Android platform

Author：Yu Kunyou1, Chen Yimin1， Luo Dehan1, Liang Yaopu2

Author Affilications：1. College of Information Engineering Guangdong University of Technology, Guangzhou 510006, China; 2. Guangzhou Canlead Automation Equipment Co., Ltd, Guangzhou 510000, China

Abstract：The authors has developed the application of nurse handheld tablet for patient rounds on Android platform. This application, developed on Android SDK and Eclipse IDE, is available in querying the basic information of the patient, the illness records, health status evaluation and other functions. Also allows the nurse to edit the patient's information and save to the server. At the same time, the nurse can measure health status periodically on patients and save the results to the server. The application was developed in the Java language. According to the requirements, the system functions models and cases analysis were given, and worked as expected on the emulator.
Key word：
Android
nurse
ward-round
Java
application
View(5710)

Design and research of intelligent vehicle terminal subsystem

Author：Shi Cunjie

Author Affilications：SAIC Motor Commercial Vehicle Technology Center, Shanghai 200438，China

Abstract：In order to reduce the harm, an intelligent vehicle terminal is designed for the safety of the transport of dangerous cargo independently. Through various types of sensors arranged in the vehicle, dangerous cargo and vehicle status can be real-time monitored throughout the transportation process. When the potential danger occurs, it can issue a warning signal to the driver; when an accident occurs, it can automatically trigger an alarm and give GPS location, which is convenient for road rescue. In addition, the intelligent vehicle terminal can exchange data and commands with the specified server via GPRS. The results show that: the intelligent vehicle terminal can run stalely, improve transportation efficiency, reduce traffic accidents, and has an exploratory significance to build the Internet of Things.
Key word：
intelligent vehicle terminal
real-time monitor
early-warning and alarm
monitoring center
Internet of vehicles
View(5388)

The research of information engineering surveillance service quality evaluation based on Cloud model

Author：Liu Hongzhi， Zhu Fangfang

Author Affilications：College of Computer Science and Information Engineering, Beijing Technology and Business University, Beijing 100048, China

Abstract：This article uses the entropy weight method to calculate the weight of each index value, to reduce the influence of human factors on the weight, and to get more objective weights; Using Cloud model to realize comments and evaluation value of the mapping between, solve the fuzziness and the randomness of the evaluation; Finally, the practical application shows this evaluation method is feasible and accurate.
Key word：
information engineering surveillance
service quality evaluation
Cloud model
entropy weight method
View(5866)

Design of high-speed real-time fiber image acquisition system based on PCIE bus

Author：Lei Yu1,2, Ren Guoqiang1, Sun Jian1,2, Xu Yonggang1,2, Huang Hui1,2

Author Affilications：1. Institute of Optics and Electronics of Chinese Academy of Sciences, Chengdu 610209, China; 2. University of Chinese Academy of Sciences, Beijing 100149, China

Abstract：PCIE technology and DMA technology are used to implement the real-time fiber image acquisition system. The paper focuses on how to implement DMA transmission on PCIE hard core and introduces the data stream of the system and the custom protocol of high speed serial fiber transmission. The test result shows that the DMA speed can reach 138MB/s, so the system fulfils the need of high-speed real-time fiber image acquisition.
Key word：
PCIE
DMA
real-time acquisition
fiber
hard core
transaction layer packet
View(10496)

Moving material bag detection method of a fused five frame difference and Gaussian model

Author：Jia Wei, Huang Xiaotian, Xie Chun, Wang Zhengyong

Author Affilications：College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China

Abstract：The article proposes a rapid detection method. Firstly, the article takes the dynamic conveyor belt and the plastic bags as the research object，uses the improved five-difference method to extract the images of moving material bags，At the same time,it takes the intermediate frame picture as a reference to update background；Then using the difference between the middle frame image and the background image，and makes morphological and operation between the foreground image and the moving image obtained by frame difference method;When the number of frames meets special condition,it shows that the frame includes complete image information of material bag, and saves the frame image, continues to detect;Oppositly, then compensate the adjacent frames which is not satisfied the condition by add operation. the experimental results shows that the method is accurate and fast, and has a strong robustness to environmental change.
Key word：
five frame difference method
single Gaussian model
morphological operation
material detection
View(4084)

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