Home > Archive > 2013 No. 07

2013 No. 07

Publish Date：2013-07-06
ISSN：0258-7998
CN：11-2305/TN
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Embedded Technology

Design of low-power Viterbi decoder with feedback pointer based on FPGA

Author：Wen Weijie，Lu Xuming，Zhu Weihong，Cai Chunxiao，Tan Hongzhou

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

Abstract：In order to meet the requirement of low power consumption and performance in complex wireless communication system, a Viterbi decoder using feedback pointer is proposed. In the decoding process, the proposed decoder makes one-to-one relationship in state transitions at every adjacent moment. Since Viterbi decoder always starts from state 0, the decoded bits are output by the updating state pointer which points to current state in the decoding path. Simulation and implementation results of FPGA and CMOS show that the decoder has 60% power reduction with less time delay, and it performs well at a high signal-to-noise ratio environment. This decoder is particularly applicable to the situation that has long constraint length and large decode states.
Key word：
low power
Viterbi decoder
FPGA
feedback pointer
View(6032)

Portable track recorder and Google Earth redisplay system

Author：He Lingxiao，Lin Fanqiang，Ma Xiaoming

Author Affilications：School of Information Science and Technology，Chengdu University of Technology，Chengdu 610059，China

Abstract：A set of portable track recorder with Google Earth representation system is designed based on MSP430F148 as the control core and E580 as the receiving module of GPS. The paper expounds hardware circuit and software of the platform. The hardware platform receives GPS information by UART of MCU, displays the real-time longitude and latitude through LCD, which will be stored in flash memory at the same time. All the stored information of longitude and latitude are sent to PC by USB interface. The PC software will convert the information to regular KML format file. Therefore, once the KML file is recognized by Google Earth software，the track of the target will be displayed on screen. The system has features of lower power consumption and simple operation, and can be very easily applied to logistics tracking, query of bus information and other projects.
Key word：
GPS
E580
track displaying
ultra low-power
Google Earth
View(6344)

Realization and simulation of rate matching based on FPGA in LTE system

Author：Liu Hui，Chen Xiaoting，Li Xiaowen

Author Affilications：School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065，China

Abstract：Rate matching is one of the most important parts in TD_LTE system. Based on intensive research of Turbo code rate matching algorithm of 3GPP protocol，an implementation scheme is proposed based on FPGA rate matching.The scheme runs the ping-pong operation to reduce rate matching processing delay.And with Virtex-6 chip as a platform，it completes the simulation，comprehensive and board level verification，etc.The experimental results show that the program based on the rate matching algorithm can obviously reduce processing delay.
Key word：
FPGA implementation
rate matching
ping-pong operation
Virtex-6
View(15896)

Research on monitoring system based on embedded GSM-R

Author：Chu Dandan，Sai Jingbo

Author Affilications：College of Eletronic Information and Control Engineering, Beijing University of Technology，Beijing 100124，China

Abstract：At present, most of the GSM-R data monitoring device takes the PC as its controller, to monitor railway GSM-R signal through the mobile monitoring vehicles equipped with sophisticated equipment. This paper puts forward a kind of the GSM-R portable data monitoring system，which take OMAP-L138 as embedded microcontroller processor.This system receives the GSM-R digital intermediate frequency signal through the monitoring terminal data acquisition module with GSM-R network, data processing module completes GSM-R digital intermediate frequency signal monitoring and interference analysing. If there is the interference，then data analysis module resolves the interference cell ID and interference sources cell ID. It makes analysis of interference more targeted.The system has the advantages of small size, rich functions, and convenient control. It has broad prospects.
Key word：
embedded Linux
GSM-R
monitoring system
CDMA
GSM
View(6768)

Design of redundant CAN bus for aerostat inertial attitude measurement system

Author：Li Baoguo，Wu Meng，Hu Wenyuan，Zhang Haihong

Author Affilications：School of Instrumentation & Opto-Electronics Engineering，Beihang University，Beijing 100191，China

Abstract：In order to improve the CAN communication ability of aerostat inertial attitude measurement system under severe environment, a system method of double-CAN redundant bus is designed. Two LPC11C24 micro-controllers with high integration are used to establish the redundant system based on DSP & FPGA navigation computer. The system′s function is tested and verified with upper computer. The test result shows that this redundant system performs well. Slave CAN starts working when ever the master CAN fails. Fault tolerance is stable. The reliability and quality of aerostat inertial attitude measurement system are enhanced without adding cost and space.
Key word：
inertial attitude measurement system
CAN bus
redundant
LPC11C24
View(16748)

The portability of TinyOS to the chip of CC2530

Author：Lin Yu1，Zhang Jinbang2，He Xiuchun1，Liu Jun3

Author Affilications：1.Graduate Management Team, Engineering University of CAPF, Xi′an 710086，China； 2.Department of Information Engineering,Officers College of CAPF，Chengdu 610213，China； 3.Department of Information Engineering, Engineering University of CAPF，Xi′an 710086，China

Abstract：Aiming at the problem that the CC2530 platform wasn’t supported by TinyOS, the fessibility of TinyOS was analyzed，and then, the portability of the TinyOS component to the CC2530 was completed, which included the Timer component, the Adc component, the Radio component, the Uart component, the I/O component and the Flash component. Lastly, the correctness of portability has been verified. The results show that every component is working well. It means that TinyOS has supported the CC2530 platform.
Key word：
TinyOS
CC2530
the portability of operating system
View(10226)

Design of portable soil moisture and soil temperature measuring instrument

Author：Li Suolin，Song Wei，Song Liangping，Huang Zheng

Author Affilications：Research Institute 722,China Shipbuilding Industry，Wuhan 430079，China

Abstract：Soil moisture and soil temperature are important soil factors. It is an important indicator of the production and research, such as agriculture, water conservancy and so on. Therefore, accurate measurement of these two elements is particularly important. LPC1766 is choosen as CPU to design a portable data collection system. The soil moisture and soil temperature can be detected anywhere and be displayed real-timely. The ARM Cortex-M3 embedded systems is chosen as the processor. The portable instrument is low power consumption, easy for operation and carry.
Key word：
portable
soil moisture
soil temperature
DS18B20
View(5466)

Application of Integrated Circuits

3 GHz～5 GHz UWB LNA with steady noise figure

Author：Wang Ningzhang，Gao Ya，Ning Ji，Xu Hui

Author Affilications：School of Computer and Electronics & Information，Guangxi University，Nanning 530004，China

Abstract：An ultra-wideband LNA circuit with cascade structure and source negative feedback inductance is introduced in this paper. It is combined with Butterworth filter theory，which is used to achieve input and output matching network of amplifier. And the paper presents the detailed analysis of the circuit noise figure. This circuit based on 0.18 μm CMOS technology is simulated for 3 GHz～5 GHz using ADS software. Simulation results show that amplifier consumes 13.2 mW from 1.8 V supply voltage. The measured max gain is 15 dB, and noise figure is less than 1.647 dB within the entire band. The input rejection coefficient is below -10 dB and the output rejection coefficient is below -14 dB.
Key word：
UWB
Butterworth filter
LNA
noise figure
View(7664)

The waveshaping filter of WSN channel based on FPGA

Author：Hui Pengfei，Yao Zhongmin，Xia Ying，Wang Yanchun

Author Affilications：Communication and Electronic Engineering Institute, Qiqihar University, Qiqihar 161006，China

Abstract：For analog filter design has poor flexibility and can not be a good solution to support data parallelism and speed, this paper uses the Altera CycloneII series of EP2C35F672C6N chip to complete the WSN channel pulse shaping filter based on FPGA. Through the function to create the table look-up method, calculation of coefficient, establish memory data table, Veilog-HDL programming, Quartus-II platform under FPGA, ModelSim timing simulation, DE2 development board download debugging process, it realizes the waveshaping hardware platform communicate with mainframe through USB interface. The test results show that the waveshaping filter has advantages of a low cost, scalable frequency, plug and play, etc., and it′s easy to use.
Key word：
WSN
FPGA
waveshaping filter
look-up table method
timing simulation
View(17910)

Design of a second-order compensated bandgap reference

Author：Yang Yunxiao，Zhang Guojun

Author Affilications：State Key Laboratory of Electronic Thin Films and Integrated Device, University of Electronic Science and Technology of China， Chengdu 610054，China

Abstract：Based on sectional compensation principle and that the drain current of the MOS transistor is squared relationship function of the overdrive voltage, the design proposes a novel second-order compensation structure.Just introducing a current which is a square relation with temperature, both compensates the reference voltage for the low temperature stage and the high temperature stage, greatly improving the stability of the reference voltage source varying with temperature. By using 0.5 μm BCD process to simulate circuit ,the results show that the output voltage is 1.24 V, and when the temperature range from -35 ℃ to 135 ℃,the temperature coefficient is 2.82 ppm/℃. And at low frequencies, power supply rejection ratio is 75.6 dB.
Key word：
bandgap reference
second-order compensation
sectional compensation
curvature correction
PSRR
View(10418)

Design of Ku-band comb-like spectrum generator based on ADS

Author：Wang Peng，Jin Sen，Huo Xianrong

Author Affilications：The 13th Research Institute of China Electronics Technology Group Corporation，Shijiazhuang 050051，China

Abstract：Comb-like spectrum generator is one of the key techniques of wide-band agility synthesizer, which can generate base signals with low spurs, low phase noise more conveniently and efficiently for the wide-band agility synthesizer in the radar system. In this paper, a design method based on ADS software is presented. A comb-like spectrum generator is simulated and designed, with an input frequency of 720 MHz and an output frequency covering 12 960 MHz～16 560 MHz. These series of Ku-band frequencies can be supplied to an agility synthesizer for the purpose of widening the frequency bandwidth. Meanwhile, it has the characteristics of excellent spectrum purity and low phase noise.
Key word：
comb-like spectrum generator
wide-band agility synthesizer
low spurs
low phase noise
spectrum purity
View(21378)

Design of intelligent track-seeking dolly based on SoPC

Author：Ji Jinshui，Liu Caihong

Author Affilications：Northwest Minorities University，Lanzhou 730000，China

Abstract：This design takes the Cyclone series FPGA CMOS chip—EP1C12Q240C8 as control unit. The Cyclone belongs to SoPC Series—E-Play1c12. Besides, the system also includes DC electric machineries, photo electricity sensors, ultrasonic sensors, power supply circuits and other circuits. The dolly is controlled to locomote along the black line in track-seeking zone and to accelerate or decelerate in special zone. In the light-seeking zone, the dolly is guided by lamp-house to locomote and stops at the end line. Meanwhile, the lattice LCD located in the head of the dolly shows the time and distance of the locomotion.
Key word：
FPGA
SoPC
photo electricity sensor
test signal
View(9780)

A novel algorithm of phase control of a brushless DC motor

Author：Xiao Erliang，Zhai Wanli，Ni Zhenzhen

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

Abstract：Based on the analysis of RC hardware filter and FIR digital filter, this paper designed the BEMF-crossing-zero hardware detecting circuit and software detecting algorithm, and fitted the frequency curve of the phase change angle by using Matlab. The results of hardware and software were fused according to the weight, which was changed with the frequency. And then a phase change angle was got, which was consistent with the actual. The angle was used to control the phase change with different frequency by DSP processor, and the BLDCM rotated smoothly，that verified that the method was reasonable and efficient for sensorless brushless DC motor control.
Key word：
sensorless brushless DC motor
BEMF-crossing-zero detecting
data fusion
phase change angle
View(15298)

A CODEC circuit for passive RFID

Author：Wang Zheyu1，Zhu Shiqian2，Liu Jin′gao1

Author Affilications：1.Department of Communication Engineering, East China Normal University, Shanghai 200241，China； 2.Department of Electrical Engineering, East China Normal University, Shanghai 200241，China

Abstract：A digital CODEC circuit for passive 13.56 MHz RFID tags based on ISO/IEC 14443 protocol is presented in this paper. The circuit is designed and fabricated based on the Altera FPGA. The circuit realizes the decoding of the modified Miller code and Manchester encoding modulated by the subcarrier, and provides the communication interface based on SPI slave for the rear-end protocol stack circuit.
Key word：
RFID
passive tag
digital CODEC
ISO/IEC 14443 protocol
View(17734)

Information Security

Research on secure access of outsourced data

Author：Li Hongwei1，2，Gu Chunsheng1，2，Bai Feng′e1，2

Author Affilications：1.School of Computer Engineering, Jiangsu University of Technology，Changzhou 213001，China； 2.Key Laboratory of Cloud Computing & Intelligent Information Processing of Changzhou City, Jiangsu University of Technology, Changzhou 213001，China

Abstract：Oblivious RAM allows a client to hide its data access patterns from an untrusted server in storage outsourcing applications. This paper proposes a novel oblivious RAM construction that achieves oblivious access with constant cost and a small amount of client-side storage for client every request.
Key word：
oblivious RAM
access pattern
data outsourcing
View(2810)

Research on SNOW3G integrity protection algorithm in TD-LTE system

Author：Li Xiaowen，Li Meimei

Author Affilications：Chongqing Key Lab of Mobile Communications，Chongqing University of Posts and Telecomunications，Chongqing 400065，China

Abstract：With the evolution of the information age, the amount of data transferred in the communication network is increasing, so are the security threats. LTE system uses SNOW3G integrity protection algorithms to ensure data integrity. This paper gives research on SNOW3G integrity protection algorithm of the basic function, analysis of the SNOW3G integrity protection algorithm flow, and VC program provides test results of the algorithm.
Key word：
TD-LTE LTE
SNOW3G
security
integrity protection
View(14072)

An artificial immune-inspired alert model in network intrusion detection

Author：Peng Lingxi1，Yang Jin2，Hu Xiao3，Zeng Jinquan4，Liu Caiming2

Author Affilications：1.Department of Computer and Education Software, Guangzhou University，Guangzhou 510006，China； 2.Department of Computer Science, Leshan Normal University，Leshan 614000，China； 3.School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006，China； 4.School of Computer Science & Engineering, University of Electronic Science and Technology of China，Chengdu 610054，China

Abstract：Based on the Snort intrusion detection system and combing with the real-time network risk evaluation theory, a new artificial immune-inspired intrusion detection alarm model, referred as SAIM, is presented. The definition of memory cell in the network security domain is depicted, and the real-time network risk calculation of memory cell is given. The risk of each type network attack, as well as holistic risk degrees of the host, can be calculated quantificationally and in real time. Finally, the network intrusion detection alarm model is built. Both the theory analysis and experimental results show that SAIM can associate the related alarm information and improve the alarm quality.
Key word：
intrusion detection
artificial immune
alarm association
View(4340)

System design of IaaS information security and operation

Author：Liang Gang，Mao Qiuyin

Author Affilications：Beijing Teamsun Technology Co.，Ltd.，Beijing 100192，China

Abstract：The information security and operation of Cloud computing is the hot issues. We designed and implemented an IaaS platform. The design of information security and operation system satisfied user’s requirement.
Key word：
IaaS
information security
operation and maintenance service
View(4560)

Measurement Control Technology and Instruments

Design and realization of fault detection device in power cars

Author：Zhang Qiang, Meng Chao， Jiao Kaizhe

Author Affilications：College of Air and Missile Defense, Air force Engineering University, Xi′an 710051, China

Abstract：With the increased development of complicated and intelligent equipment and the shortage of indemnity, we had proposed an intelligent fault detection device. Through automatically gathered datas of power cars key nodes, the device would analyzed and gave a judgment, thus realized the power cars fault detection online and offered technically support to the users. The hardware part of the device contains data acquisition circuit, analogical to digital conversion circuit and so on; the software part contains the main control program, interrupt service routine program. By means of connection and examination with the power cars, we had verified the practicality and reliability of the device.
Key word：
detection device
fault diagnosis
analog-to-digital conversion
data processing
View(5144)

Research and design of monitoring network cold-chain transport based on RFID

Author：Xu Shufang, Wang Jinhai, Gong Yulong

Author Affilications：College of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China

Abstract：In allusion to the shortages of the cold-chain transportation monitoring network, a RFID-based monitoring network is designed to monitor the dynamic parameters of vehicle terminals in this paper. The system mainly consists of vehicle terminal and monitoring center. Vehicle terminal is composed of STM32F103RBT6 central controller, GPS positioning module U-blox NEO, GPRS wireless communication module SIM900, RFID electronic tags and readers, and other peripheral circuit. The system can achieve functions of data collection, analysis, pretreatment, alarm and monitoring. Monitoring Center can wirelessly receive, parse and online display temperature and humidity, and location data. The experimental results show that the system has a high reliability characteristic and low-cost hardware. It efficiently accomplishes real-time monitor of temperature, humidity data and vehicle positioning information, so it is suitable for use in cold-chain logistics industry.
Key word：
cold-chain transport
RFID
STM32
vehicle terminal
GPRS
View(7308)

Control strategy of temperature compensation of intelligent AC contactors

Author：Zhou Liang1, Shu Liang1, Wu Guichu1, Xie Wenbin1, Chen Xiaojun2

Author Affilications：1.The Key Laboratory of Low-Voltage Apparatus Intellectual Technology of Zhejiang，Wenzhou University， Wenzhou 325000，China; 2. Zhejiang Tengen Electric Stock Co.，Ltd.，Wenzhou 325600，China

Abstract：The dynamic response of the ac contactors can be seriously affected by the high temperature caused by the frequently switching and the environmental temperature. A control strategy is proposed to compensate the influence due to the temperature rising. The strategy is implemented with PWM principles. The real-time input voltages and temperature values are obtained by the control unit as the feedback signals. A lookup table is established by measuring the relationship between the control voltage, temperature and the duty cycles of the PWMs. The optimal duty cycles and the strong excitation time at different temperature are determined from the lookup table when feedback signals are obtained. Experimental results show that the closing process of the contactors can be optimized at different temperatures. The influences of the temperature rising can be compensated by using the control strategy.
Key word：
PWM
feedback control
intelligent AC contactors
dynamic characteristics
temperature compensation
View(7206)

Design and implementation of coal mine gas auto-sampling device

Author：Liu Jiancheng1,2, Li Lele1，Li Hao1，Yu Benru1， Qiu Yuan1， Tang Ke1

Author Affilications：1.School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science & Technology, Nanjing 210044, China

Abstract：Aiming at the gas concentration measurement of the coal mine methane, a kind of gas automatic sampling device is designed based on the liquid level sensor. The device is composed of liquid level sensor, signal conditioning circuit, single chip microcomputer control system, matrix keyboard module and display module. The experiment result shows that the device has high accuracy and good controllability.
Key word：
concentration measurement
liquid level sensor
auto shaping device
MSP430
View(5866)

Gas monitoring and alarm system based on short-range wireless/wired communication technology

Author：Wang Xiangyun, Dong Dabo, Wu Nanjian, Zhao Baiqin

Author Affilications：Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

Abstract：According to the gas monitoring requirement of combustible gas leak-prone area, a gas monitoring and alarm system based on short-range wireless/wired communications was proposed. In this system, we designed the wireless/wired gas monitoring and alarm terminal using generic combustible gas sensor, temperature sensor, 8-bit microcontroller and 433 MHz RF-Transceiver chip as the core devices. Furthermore, PC monitoring software was designed for practical application. The gas monitoring and alarm system can monitor real-time gas concentration and temperature remotely. It has the function of dynamic display, historical data query and alarm.
Key word：
gas monitoring
wireless communication
remote monitoring
View(5538)

Study of digital pulse forming technology based on FPGA

Author：Wang Min， Fang Fang， Cao Jianyu， Zhou Jianbin， Ding Weicheng

Author Affilications：Chengdu University of Technology, Chengdu 610059, China

Abstract：In this paper, FPGA is used as the master chip, to achieve the digitized pulse shaping circuit. The circuit not only can replace traditional analog filtering shaping circuits, but also to reduce the introduction of white noise in the analog circuitry to improve the flexibility and stability of the system, has some theoretical significance and practical value.
Key word：
FPGA
high speed ADC
trapezoidal shaping
digitized
filter
View(9840)

Design of the electrostatic protection circuit for EEG detection preamplifier

Author：Wang Min1, Chen Yaguang2

Author Affilications：1. College of Information Engineering,Wuchang University of Technology, Wuhan 430223, China; 2. College of Biomedical Engineering，South-Central University for Nationalities, Wuhan 430074, China

Abstract：Using CMOS instrumentation amplifier as the preamplifier of EEG detection is often technical solutions. However, CMOS device is very sensitive to the static electricity. When the COMS component is used as preamplifier，the enormous energy electron stream from human body static electricity will breakdown COMS tube insulated gate and stay there, making the amplifier does not work. Commonly， the capacitor can be used to form an electrostatic protection circuit, But this will reduce the CMRR，for it is very difficult to adjust the balance of two capacitors in wide range．To solve this problem, We have designed an active tank circuit that can fine adjust the size of the equivalent capacitance. Under the premise does not affect CMRR and improve the anti-static electricity ability of the amplifier, and enhance the reliability of the system.
Key word：
CMOS instrumentation amplifier
electrostatic discharge protection
active capacitor
View(13466)

Communication and Network

An ADS-B based clustering algorithm in aviation Ad-Hoc networks

Author：Zhang Hai1， Li Gang1， Chen Guangxiao2， Li Jinglin2

Author Affilications：1. Radar and EW Institute, Equipment Academy of Air Force, Beijing 100876, China; 2. Beijing University of Posts and Telecommunications, State Key Laboratory of Networking and Switching Technology, Beijing 100876, China

Abstract：An effective architecture is the key technology of routing and resource managing in large Ad-Hoc networks. In the aviation network, the quality of communication between aircrafts declines with the increasing number of aircrafts. To deal with this problem, an ADS-B message based novel clustering algorithm is presented for aviation Ad-Hoc networks. The proposed algorithm uses the mobility and location of aircraft, provided by ADS-B messages and node degree for cluster formation and maintenance. Some simulations are performed and the results indicate that the proposed algorithm can lower the number of clusters and the rate of switching nodes, and it can effectively improve the cluster stability and efficiency of aeronautical communications.
Key word：
aeronautical telecommunication network
ADS-B
Ad-Hoc
cluster
View(6712)

Research of AODV routing protocol based on route prediction

Author：Cai Xiaoqing, Lu Xiaoli, Song Xiaohua, Chen Xiaofang

Author Affilications：North College, Beijing University of Chemical Technology Information centres, Langfang 065201, China

Abstract：In mobile ad hoc networks (MANET), due to the changing topology and limited bandwidth, link break frequently occurs in mobile ad hoc networks. In traditional AODV, the source node broadcasts RREQ message to find a new route to the destination when the link break occurs. Control overhead and long packet delay are high. In this paper we propose an improved routing repair algorithm(RP-AODV). The intermediate node, which detects the link break, to repair the break route. Once the intermediate node cannot repair the route in time, the backward pre-hop node tends to find a new route instead. The simulation is done through network Simulator-2, Results show that RP-AODV performs better in terms of routing overhead, end to end delay than classic AODV. the control overhead ratio is decreased by 40% , and the end to end delay is decreased by 25%. RP-AODV is quite suitable for such a dynamic network.
Key word：
mobile Ad Hoc networks
route repair
routing overhead
View(6482)

A timing error estimation method of APSK signals based on digital square algorithm

Author：Hu Jingming, Guo Daoxing

Author Affilications：Institute of Communication Engineering, PLA University of Science and Technology, Nanjing 210007, China

Abstract：APSK signals are seriously affected by the transceiver system when APSK is applied to satellite communications, and the synchronization algorithm is complex. The model of APSK signals is introduced, and a digital square algorithm is adopted to estimate the timing error. Simulation results show that this method performs well on estimating the timing error and it is uninfluenced by the carrier frequency offset, and the relation between algorithm performance and data length is obtained by simulatios.
Key word：
APSK signal
timing recovery
digital square algorithm
Fourier transform
View(5258)

Research of an improved DSR routing protocol of self-organization network

Author：Li Nan1,2, Song Ke1,2, Chen Dianjun1,2

Author Affilications：1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; 2. Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory, Shijiazhuang 050081, China

Abstract：This paper proposed an improved DSR routing protocol based on cache optimization, it improved the route shortening mechanism of DSR, and simulated the improved protocol with the original DSR protocol on the NS2 platform. The simulation result proved that the improved DSR is superior to the original DSR protocol on network throughput, end-to-end delay, packet loss rate.
Key word：
cache optimization
DSR
route shortening
NS2
View(8320)

Improvement of uplink semi-persistent scheduling resource collision problem in LTE system

Author：Gao Jike， Zhang Demin

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

Abstract：In LTE(Long Term Evolution) system, schedule is an important technology for basic station allocating resources to users. LTE system puts forward a new schedule method: semi-persistent scheduling(SPS) for services such as VoIP(Voice on Internet Protocol), mediastream and so on. Uplink resource is very precious in resources scheduling. Considering the problem of resource collision in uplink semi-persistent scheduling HARQ(Hybrid Automatic Repeat reQuest) process, this paper makes a thorough research on semi-persist scheduling interval and semi-persistent scheduling initial place, gets the best uplink period and designs the method that delaying the transmission of collision process. The result shows that the method reduces the problem of resource collision, improves resource utilization rate and makes an improvement on system stability.
Key word：
semi-persistent scheduling
HARQ
semi-persistent scheduling interval
View(11962)

Multi-packet reception based OPNCC in wireless networks

Author：Jiang Jian1, Chen Chen2

Author Affilications：1. Chensi Co. Ltd, Shanghai 200135, China; 2. Shanghai Bell-Alcatel Co. Ltd, Shanghai 200136, China

Abstract：In this paper, we propose a multi-packet reception based opportunistic physical network-coded cooperation(MPR-OPNCC) scheme suitable for multiple unicast transmissions in a single-cell or inter-cell wireless network. MPR-OPNCC adopts physical network-coding (PNC) and multi-packet reception(MPR) technology, which enable multiple source nodes to transmit at the same time slot and the destination nodes to detect their wanted data from the interfered signal. Meanwhile, MPR-OPNCC is also an opportunistic communication scheme. With the limited feedback from the destinations; the relay node can decide whether to do cooperation or not. The analytical and numerical results show that, compared with opportunistic network-coded cooperation(ONCC),MPR-OPNCC provides a similar system outage probability while doubling spectral efficiency.
Key word：
cooperative communication
opportunistic
physical network coding
multi-packet reception
system outage probability
spectral efficiency
View(4876)

A PSO-based design for ultra wideband receiver

Author：Zeng Qiming1,3, Li Zhan2,3, Ji Zhen2,3

Author Affilications：1. College of Information Engineering, Shenzhen University， Shenzhen 518060, China 2. College of Computer and Software Engineering, Shenzhen University, Shenzhen 518060, China 3. Shenzhen City Key Laboratory of Embedded System Design, Shenzhen, Shenzhen 518060, China

Abstract：The design of ultra wideband(UWB) receiver is usually a tedious and experienced based work for its high nonlinearity. A novel PSO algorithm based systematic design method named PSO-UWB is proposed in this paper. Based on self-adaptive intelligent single particle optimizer(AdpISPO) algorithm, the relation function between the receiver output signal-to-noise ratio (SNRout) and the parameters of key components are used for optimization which target for the maximum SNRout. Simulation results in ADS show that the optimized results of the PSO-UWB meet the design requirements, and it is feasible.
Key word：
UWB receiver
particle swarm optimization
ISPO
AdpISPO
ADS simulation
View(13670)

Computer Technology and Its Applications

Design and implementation of the food shelf-life monitoring system

Author：Zhang Hanfei1, Zhou Ping1, Sun Huajun1, Feng Guofu2, Ge Zhiyong1

Author Affilications：1. Huaiyin Normal University, HuaiAn 223300, China; 2. Shanghai Ocean University, Shanghai 201306, China

Abstract：Due to the disadvantages of the traditional food shelf-life indicator and barcode which cannot record the real time in the food cold-chain logistics,paper designs the food shelf-life monitoring system. This system contains the front monitor device, monitor terminal and monitor center. Having been debugged preliminary，the design of the system was tested successfully． The front monitor device can detect the food quality information, monitor terminal is able to send these data to the monitor center. This system could achieve real-time monitoring to food.
Key word：
embedded system
RFID
GPRS
monitoring system
View(7248)

TTCN-3 applies in protocol conformance testing of RRC

Author：Dong Hongcheng, Zhang Ning, Li Xiaowen

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

Abstract：A new testing method is designed by implementing Testing and Test Control Notation Version 3(TTCN-3) abstract test suit. Furthermore, the test suit is operated on the TTworkbench developed by German Testing tech. It also generates graphical presentation format(GFT) to check the protocol conformance of RRC functions. The scheme has been successfully applied in the project development of TTCN extended test set instrument in LTE system.
Key word：
TTCN-3
LTE
RRC
protocol conformance testing
GFT
View(6102)

A multi-touch system based on spherical display

Author：Wang Jilin1， Xie Ran1, Wei Yang1, Zhao Li2

Author Affilications：1. Yancheng Institute of Technology, College of Information Engineering, Yancheng，224051，China； 2 College of Information Science and Engineering, Southeast University, Nanjing 210096, China

Abstract：A multi-touch system based on the spherical display is designed and implemented. The hardware structure and software implement have been introduced.After some system testing and validation, this multi-touch system has shown the interactivity and convenience.
Key word：
multi-touch
spherical display
contact tracking
gesture recognition
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Vehicle smart player system based on the stereo minitheater

Author：Yang Keling

Author Affilications：Department of Computer and Information， Shangqiu Normal University, Shangqiu 476000, China

Abstract：A program of vehicle player system was proposed based on the Stereo Minitheater. The hardware real-time system of QNX was used to the terminal platform. Layer logic was used to build the system prototype, which reduced the coupling between modules. FFMPEG library was introduced to do a synchronized real-time decoding, to meet the fast focus of stereoscopic glasses. In order to achieve real-time rendering and display of image frames, a multi-stream stereoscopic rendering model was designed based on GLES 2.0, Experiments show that, this program not only improves the efficient implementation of the miniature 3D cinema function in the vehicle, but also effectively enhances the vehicle′s brand competitiveness.
Key word：
vehicle entertainment
stereo theater
layer logic
stereoscopic glasses
View(5762)

AGV assembly robot based on IPC control system design

Author：Xu Wenbin, Cai Ronghua, Lin Kerong, Sun Guangda, Chen Yanbo, Tan Zhu

Author Affilications：Guangzhou College of SCUT, Guangzhou 510800, China

Abstract：This paper designed a double lift AGV Assembly robot based on IPC control system. Tape line-tracking navigation completed features in the text, using PSD complete AGV and synchronous test line. Useing the wireless network adapter Wifi networks, TCP/IP protocol operation of data transmission, as well as complete AGV and control centre.
Key word：
IPC
double lift
AGV
assembly line
robots
View(19688)

Circuit research of dual standby for each other contact-less heart pacemaker power supply

Author：Zhou Chenghu， Li Songtao， Xu Qixing

Author Affilications：College of Electrical Information and Engineering，Henan Institute of Engineering，Zhengzhou 451191, China

Abstract：This paper proposes a solution of dual standby contact-less power system for pacemakers, including two mutual backup power supply circuits in vitro and an intra-individual power receiving circuit. The module control in vitro-powered device to standby for each other. When the vivo inductance coil was impacted by strong magnetic field, or body energy receiving device exceeds allowable temperature, circuit can automatically enter protection mode, and can maintain pacemaker work properly. Experiments show that the circuit is feasible.
Key word：
pacemaker
dual power
contact-less power supply
wireless communications
automatic switching
View(7458)

Research of bootloader and its implementation with C for DM642

Author：Liu Yong1,2, Zhang Zhongwei1, Dong Wentao1, An Junshe1

Author Affilications：1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China; 2. Graduate University of Chinese Academy Sciences, Beijing 100190, China

Abstract：This paper describes the basic principle and loading process of secondary bootloader and its implementation with C for DM642. The feasibility and stability of this scheme has been verified. A new idea and way for developing multimedia processing system based on DM642 is provided. It has great practical significance.
Key word：
DM642
self-startup
secondary bootloader
C language
View(9344)

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