Home > Archive > 2013 No. 02

2013 No. 02

Publish Date：2013-02-06
ISSN：0258-7998
CN：11-2305/TN
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Embedded Technology

Development methods of establishing cooperation between ARM and DSP based on OMAP3530 hardware platform

Author：Lin Shangsheng，Han Runping

Author Affilications：School of Information Engineering, Beijing Institute of Fashion Technology, Beijing 100029，China

Abstract：Taking OMAP3530 as the hardware platform and DVSDK as software tools, this paper introduces how to establish the development environment in order to make ARM and DSP work cooperatively, especially expounds two development methods for establishing cooperation between ARM and DSP. The advantages and disadvantages of two development methods are pointed out in this paper.
Key word：
OMAP3530
ARM
DSP
DVSDK
Codec Engine
View(10288)

Design of transceiver for SAW RFID based on Zero-IF

Author：Li Xumei1，Huang Jun1，Liu Hong2

Author Affilications：1.Chongqing Key Laboratory of Signal and Information Processing，Chongqing University of Posts and Telecommunications， Chongqing 400065，China； 2.Institute of Communication Engineering，Chongqing University of Posts and Telecommunications, Chongqing 400065，China

Abstract：This paper designs a Zero-IF transceiver with dual-channel for the SAW RFID system with the physical characteristics of SAW tag，and explains hardware structure in detail，then gives solutions of the direct shift，carrier leakage，and even higher harmonic distortion in Zero-IF transceiver. Test results show that this system predigests the design, reduces the cost and improves the performance of a SAW RFID transceiver comparing with the other ones.
Key word：
RFID
SAW
Zero-IF
direct shift
transceiver
View(7418)

A ROM optimization method of DDS-based arbitrary waveform generator

Author：Li Chao，Xie Xuesong，Zhang Xiaoling

Author Affilications：Semiconductor Reliability Research Departmention, Beijing University of Technology，Beijing 100124，China

Abstract：This paper presents an improved method of arbitrary waveform generator based on direct digital frequency synthesis(DDS) technology achieved on field programmable gate array(FPGA). First, it writes the waveform data of triangle wave, sine wave, square wave, and ascending or descending sawtooth wave data to the off-chip memory, and moves the corresponding data into FPGA on-chip RAM when it is invoked, which replaces the traditional method that stores all types of waveform data in on-chip RAM sub-blocks. Then，it takes use of the symmetry of sine and triangle waveform in the four quadrants, and the linearity of the sawtooth waveform, process the waveform data and the address value by hardware inverter. It can restore the same-precision analog signal with a quarter of the amount of data. The overall storage capacity is reduced to 5% of the original design. After validation, this improved method is feasible, and it can greatly reduce the development costs.
Key word：
DDS
FPGA
ROM optimization
View(10002)

Research and implementation of the sub-frame scheduling of MAC in TD-LTE system

Author：Jiang Zhongjun，Zhang Demin，Tuo Qin

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

Abstract：ase on the real-time requirements in TD-LTE system，the sub-frame scheduling of MAC layer has been achieved based on the study of real-time between the MAC layer and physical layer and the analysis of Nucleus PLUS operating mechanism. According to the real-time requirements in TD-LTE wireless comprehensive tester, loop scheduling mechanism of Nucleus PLUS task has been described in detail and the MAC sub-frame scheduling process has been designed. While the basic functions of the MAC layer has been realized, the real-time capability of the TD-LTE and the needs of sub-frame synchronization with the resource management of task have been met.
Key word：
TD-LTE
MAC
real-time capability
sub-frame scheduling
View(7712)

Design of the FPGA′s configuration and communication interface based on CY7C68013A

Author：Liu Zhihua1，Guo Fucai1，Peng Xinwei2，Chen Jidong3

Author Affilications：1.Department of Atmospheric Sounding and Equipment Engineering, Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101，China； 2.Meteorological and Hydrological Center of Military Area Command of Nanjing, Nanjing 210016，China； 3.Nanjing Yangchen S&T Co., Ltd., Nanjing 210022，China

Abstract：In order to realize that the computer can configurate FPGA online and high speed data transmission, this paper puts forward an USB2.0 interface design method based on CY7C68013A chip. The paper introduces the system hardware circuit design and software programming, and detailed analysis of the CY7C68013A′s firmware program design method. At the time of configurating FPGA，the CY7C68013A chip is controlled by the internal CPU and the configuration speed is 6 Mb/s; whereas during date transmission, in order to improve the transmission speed, the CY7C68013A is configured slave FIFO mode. This scheme can be widely applied to the software radio project development.
Key word：
CY7C68013A
USB interface design
FPGA
software radio
View(18218)

Research and design of embedded real-time communication protocol stack

Author：Du Wenfeng，Wang Bowen

Author Affilications：School of Information and Electrical Engineering,China University of Mining and Technology，Xuzhou 221008，China

Abstract：Traditional TCP/IP protocol did a lot of effort to ensure the reliability of data transmission and flow control, so that in the field of embedded where real-time requirements are relatively high, TCP/IP protocol revealed a lack of real-time. This paper analyzes the embedded communications protocol stack based on TCP/IP protocol, improves the TCP congestion control problem in communication, and effectively improves the real-time nature of the TCP/IP protocol.
Key word：
TCP/IP protocol
real-time
View(6736)

Design of voice communication system on CAN bus based on queuing theory

Author：Dan Chengfu，Liu Xiaoming

Author Affilications：College of Communication Engineering, Chongqing University, Chongqing 400030，China

Abstract：According to the condition that traditional voice communication system has many defects, such as complex address coding, single communication mode and difficult to maintain, a multifunctional voice communication system which can apply to industrial field is designed. In this paper, the voice communication system translated on CAN bus is theoretically analyzed base on queuing theory. It mianly expound the hardware and software design of the CAN bus and a final test results is given at last. The results show that the loss rate of CAN frame of the system is less than 0.5‰, voice quality can pass the subjective and objective test, and the overall system can work well.
Key word：
CAN
queuing theory
voice communication
View(2872)

Application of Integrated Circuits

Design of a wireless alarm self-locking lock

Author：Wang Dalong1，Zhang Yunwei2，Zeng Weijun1

Author Affilications：1.Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500，China； 2.Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500，China

Abstract：In order to overcome that the common lock can not effectively prevent prying and alarm in time, this paper introduces a design of a wireless alarm self-locking lock. The lock comprises a buzzer alarm circuit, a wireless alarm circuit, a self-locking circuit and an identification circuit, which enhances the locking reliability.
Key word：
buzzer alarming
wireless warning
self-locking
View(6972)

The scheme research of traditional STB energy-saving improvement and remote control integrated

Author：Zhang Xinjian1，Liu Pei1，2，Yang Xiaokun1，Peng Cheng1，Ling Jianhua1

Author Affilications：1.Huazhong University of Science and Technology Wenhua College，Wuhan 430074，China； 2.College of Electrical & Electronic Engineering，Huazhong University of Science and Technology，Wuhan 430074，China

Abstract：This paper puts forward a traditional STB energy-saving improvement and remote control integrated scheme research. Under the prerequisite of not modifying the basic structure of the original circuit placement design, by increasing the controlling system which consists of relay, SCM minimum system and infrared emission and so on, the standby power consumption becomes from the pre-improvement 5.07 W down to 0.76 W which may save about 90% of energy. In addition, a practical remote control integrated scheme is proposed，which not only avoids the user toggling two remote control integrated back and forth and enhances user experience，but also overcomes the shortcomings of complex improvement program and high cost etc.
Key word：
STB
energy-saving improvement
remote control integrated
View(4150)

Design on signal source of certain missile angle-speed combination coder

Author：Jing Peng，Wang Heming，Zhang Jingwei

Author Affilications：School of Air and Defense, Air Force Engineering University，Xi′an 710000，China

Abstract：Under the control of the SCM and one FPGA chip, the signal source is designed on a DDS module based on computer serial communication bus. At the same time, a spare signal source based on the chip AD9959 is designed. The software program of signal source is designed with VHDL language in QuartusII 7.2. The simulation and experiment show that the output signal has a good stability, a high resolution and accuracy. The frequency, amplitude and offset of the signal are flexible and adjustable, too. The signal source can meet the technical requirements and performance index of the certain missile angle-speed combination coder. It has a good application value.
Key word：
FPGA
DDS
AD9959
signal source
View(8152)

City bus supervisory device based on GPRS and location-based service

Author：Wang Xiaonan1，Zhang Xingbo2，Li Bingxiang2

Author Affilications：1.National Computer System Engineering Research Institute of China，Beijing 100083，China； 2.Beijing Systems Control International Inc.，Beijing 100083，China

Abstract：The advantages of location-based service over GPS in the application of city public traffic terminals are analysed and the design of bus supervisory device based on GPRS and location-based service is introduced. The technology implementation based on ARM embedded system platform is illuminated in detail.
Key word：
GPRS
location-based service
SIM900
embedded system
View(10532)

The hardware design and verification of projection in graphics process

Author：Yang Shiwang1，Jiang Lin2，Su Cheng1

Author Affilications：1.Department of Computer Science，Xi′an University of Posts and Telecommunications，Xi′an 710061，China； 2.Department of Graduate，Xi′an University of Posts and Telecommunications，Xi′an 710061，China

Abstract：This paper describes the hardware implementation of projection which based on float-point processing unit. In order to improve the speed，the hardware is designed and implemented on Verilog language, ISE is used for logic synthesis，and SystemVerilog is used for verification. The result shows that the speed is increased by this design.
Key word：
graphics pipeline
hardware implementation
logic synthesis
projection
View(7784)

Realization of remote access system based on the KEELOQ technology

Author：Xue Jufeng，Qiao Peng

Author Affilications：College of Machinery and Electricity Engineering，Northeast Forestry University，Harbin 150040,China

Abstract：A remote access system is designed by using rolling code technology，with the HCS301 for size coding and the decoding，and using the PIC16F630 chip，which are based on the operation of the KEELOQ technology decoding arithmetic. The system flow chart and part of the hardware principle diagram are given. And the key generation and decoding process are detailed. This system has characteristics of high confidentiality, easy to use and low cost.
Key word：
HCS301
PIC16F630
rolling code
KEELOQ technology
View(8920)

Design of motor decode system based on AD2S1210

Author：Wang Yujue，Weng Haoyu，Zhang Haiyong，Song Xuejing，Lei Zhanxiu

Author Affilications：R&D Center of Great Wall Motor Co.,Ltd., Automotive Engineering Technical Center of Hebei Province，Baoding 071000，China

Abstract：On the basis of explaining the working principle of the transformer,a new solution for the E-motor location decoding system is introduced, with the detailed design process and preferences. This solution is based on ADS2S1210(revolving transformer/digital converting IC produced by ADI ),and lays great emphasis on the interface circuit of ADS2S1210,inspiring amplifier circuit and the interface to the TC1782. It has successfully applied on the electric vehicle C20EV of Great Wall Motor.
Key word：
revolving transformer
AD2S1210
rotor position
RDC
View(20126)

Power Supply Technology and Its Application

PWA modeling and model predictive control of DC/DC converter

Author：Fang Wei，Wang Qing，Liu Xiaodong

Author Affilications：College of Electrical Engineering，Anhui University of Technology，Maanshan 243000，China

Abstract：In this paper, the method of the ?自 steps discretization is introduced firstly, which presents the mapping relationship between the input variable and the state variable of the converter. Then the dynamic equations are analyzed based on the hybrid system theory, which evolved into the PWA(piecewise-affine) model. Combined with the nonlinear predictive control method, the output of the system is predicted by the PWA model, and the feedback signal is used to correct the uncertainty. By solving the linear optimal quadratic performance, the predict controller is designed. At last, the simulation result of the Buck converter is presented, compared with peak current model control algorithm, the validity of the model and the effectiveness of the proposed controller are verified.
Key word：
switching converter
hybrid system
piecewise-affine model
model predictive control
View(6900)

Research of backup power supply scheme based on intelligent power distribution terminal

Author：Li Guowu1，Wu Yuping1，Luo Haibo2，Wang Junfeng2，Xu Jian2

Author Affilications：1.Northern Hebei Zhangjiakou Power Supply Company，Zhangjiakou 075000，China； 2.Beijing Sifang Automation Co.，Ltd.，Beijing 100085，China

Abstract：Experimental test of the performance of silicon batteries, VRLA and super capacitors, summarizes the characteristics of the three batteries in the operation of the terminal back-up power; detailed analysis of the silicon can be battery compared with the conventional valve-regulated lead-acid batteries, and come to silicon to the battery terminal back-up power far stronger than the conclusion of the lead-acid batteries; analysis of the feasibility of the super capacitor backup power supply as a terminal, come to the super capacitor in the high and low temperature can reach the conclusion of the effective capacity retention rate; highlight the advantages of silicon batteries and super capacitors, combined with the specific terminal where the occasion, three back-up power solutions.
Key word：
silicon batteries
super capacitors
intelligent distribution terminals
back-up power
View(7544)

Design of a digital high accuracy power supply for piezoelectric ceramics

Author：Teng Xudong1，2，Zhang Dong2，Liang Xiaofeng3

Author Affilications：1.College of Electronic and Electrical Engineering，Shanghai University of Engineering Science，Shanghai 201600，China； 2.Institute of Acoustics，School of Physics，Nanjing University，Nanjing 210093，China； 3.Xi′an Rironic Electronic Technology Co.Ltd，Xi′an 710075，China

Abstract：A PZT power supply with high accuracy and low drift is developed, which include digital tracking signal generator, composite amplifier and phase compensation circuits, etc. This composite amplifier uses a low voltage amplifier OP07 to control accuracy and drift, and the PA04 acts as voltage and current booster which are selected to diver piezotransducers. Furthermore，the stability of the composite amplifier are analyzed in detail, and optimum heatsinking are considered to improve the thermal resistance rating of heatsinks. The simulating results show this design is reasonable and effective.
Key word：
digital tracking
composite amplifier
piezoelectric ceramics
PA04
View(6690)

Symmetrically of coupling inductance in 4-phase interleaving converter

Author：Wang Jianyuan，Zhang Xu，Li Haiguang

Author Affilications：School of Electrical Engineering，Northeast Dianli University，Jilin 132012，China

Abstract：In order to improve the performance of interleaving converter, this paper analyzed parameters of bidirectional DC/DC converter about the asymmetric coupling inductance, and deduced the equivalent steady-state inductance and equivalent transient inductance mathematical expressions in three-phase interleaving buck converter. With existing coupled inductance structure, the asymmetric coupled inductance was symmetrically in this paper. Then we carried out the simulation from Saber and 3D Maxwell software. Finally, theory analysis and simulation results are shown correctness by the experimental results of prototype.
Key word：
interleaving converter
asymmetric coupling inductance
equivalent inductance
magnetic circuit model
symmetrically
View(1942)

Measurement Control Technology and Instruments

Research on information fusion technique of GPS/SINS tightly-coupled navigation system

Author：Wu Fengzhu, He Yu, Jiao Xu, Li Nanhai

Author Affilications：Institute of Information Engineering,Nanchang Hangkong University, Nanchang 330063, China

Abstract：In order to improve the navigation precision of missile under the complex environment .With GPS/SINS Tightly-coupled integrated navigation system as the object of the research,first of all, the mathematical model of GPS/SINS Tightly-coupled integrated navigation system is derived;and then the algorithm of the EKF and UKF are analysed amply.Finally,EKF and UKF are replied to GPS/SINS tightly-coupled integrated navigation system，and the simulation result indicates UKF takes precedence of EKF in the estimation of position and velocity.Moreover,UKF has the better stability and stypticity.
Key word：
GPS
SINS
tightly integrated navigation
Kalman filtering
View(13764)

Application of iterated extended Kalman filtering in mobile robot localization

Author：Qiang Minli， Zhang Wanxu

Author Affilications：College of Information Science and Technology, Northwest University, Xi′an 710127，China

Abstract：To address the problem of performance degradation and even divergence of EKF caused by poor estimates of the observation noise，an iterated extended Kalman filter fusion algorithm based environment characteristic is proposed. This algorithm combined with the robot internal data collected by odometer and external environment characteristic collected by laser radar sensor. In the measurement of update stage, the state estimation is iterated many times to correct the robot position, and the nonlinear error is reduced and localization accuracy is improved.
Key word：
self-localization
mobile robot
Kalman filtering
information fusion
View(6034)

Household comprehensive monitoring system based on Internet of Things

Author：Wang Longshan, Ma Jun

Author Affilications：Ministry of Education Key Lab of Advanced Transducers and Intelligent Control System, Taiyuan University of Technology, Taiyuan 030024, China

Abstract：Based on ZigBee technology established wireless sensor network, the design takes temperature, humidity, light, illegal intrusion detection, fire detection and timely warning integrated the intelligent household comprehensive monitoring system. It is proved reliability and accuracy through the related experiments and will be widely applied in modern life.
Key word：
Internet of Things
ZigBee
wireless sensor network
sensor
household comprehensive monitoring
View(8496)

Three-wire serial interface test system based on MSP430 and FPGA

Author：Yang Ting， Nian Wei

Author Affilications：Beijing Institute of Space Mechanics & Electricity, Beijing 100076, China

Abstract：Designed a three-wire serial interface tester based on the MSP430 MCU and FPGA by studying the constitute principle of the three-wire serial interface. The tester used MSP430 microcontroller to control the three-wire transmission function, the three-wire transmission timing generated by the FPGA and the corresponding host computer software is compiled to test the data communication. Test results show that the three-wire serial interface tester have the characteristics of easy to use, fully function, and stable performance, which could be better used in the three-wire serial interface communications test of the aerospace industry.
Key word：
three-wire serial interface
communication test
FPGA
MSP430
timing control
View(7132)

Remote data transmission system based on NiosII and 3G wireless networks

Author：Dai Junfeng

Author Affilications：Faculty of Computer Engineering, Huaiyin Institute of Technology, Huaian 223003, China

Abstract：In order to relize the remote data transmission at where wired network is difficult to cover, remote data transmission system based on NiosII was was designed. Using IP core in the FPGA chip to build NiosII control system and UART interface communicating with 3G module, data transmission control procedures and communication protocols wse designed to achieve the data remote transmission via 3G wireless network. Testing in power system remote data acquisition system proved that the transmission system has perfect function, reliable running.
Key word：
3G wireless network
NiosII system
remote data transmission
View(10454)

Research on measurement of pressure signal and circuit design

Author：Yang Junfeng1, Du Jun1, Su Lei1, Yang Pu2

Author Affilications：1. Air Force Engineering University, Aeronautics and Astronautics Engineering College, Xian 710038, China; 2. Army Aviation Institute, Beijing 101123, China

Abstract：The measurement precision of the engine’s lubricant oil pressure that in the FDR (Flight Data Recorder) is lower than needed. Aiming at this problem, the working mechanism of the measurement circuit is analyzed in the first. And then the resolution is given by adding a measurement circuit of the power supply voltage beside the FDR. The working circuit is designed and the testing results are analyzed. So on the precondition that keep the inside hardware structure of the FDR remains unchanged，the precision of the engine’s lubricant oil pressure can be greatly improved, which can provide important proof to the surveillance of the engine.
Key word：
lubricant oil pressure
signal testing
half wave commutation
analogue arithmetic
View(4540)

The communication interface research and application implementation of sensor modules in Internet of Things

Author：Zhang Yi, Lan Lihui

Author Affilications：College of Communication, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Abstract：Due to the limitation of communication interface, when ZigBee and sensors exchanges messages, the data format and type do not match. A general sensor module is designed to mainly solve the communication interface problem between ZigBee and kinds of sensors like switch sensors, simulation sensors and digital sensors, which can combine the sensor and ZigBee technology to implement the collection and controlling of all kinds of sensors’ information.
Key word：
sensors
communication interface
ZigBee
IoT
View(4630)

Communication and Network

Research on modulation technology of medium voltage distribution network carrier communication

Author：Xie Zhiyuan, Yang Xing, Gong Zhengang, Wu Xiaoyan, Guo Yihe

Author Affilications：School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China

Abstract：Reasonable modulation mode can effectively improve its capacity of resisting disturbance. According to the features of PLC, analyzed its attenuation characteristics and modeled it based on transmission line theory. Comparison of the calculation and measured results verifies the accuracy of the model. Introduced the fundamentals and advantages of OFDM and analyzed its realization process. Simulated the transmission characteristics of OFDM in the measured power line channel. Further studied its resistance to multipath fading ability in poor channel environment, providing reference for giving full play to the advantages of OFDM.
Key word：
medium voltage PLC
transmission line theory
attenuation characteristics
OFDM
View(6142)

Location of bridge over water based on the extraction of environment elements

Author：Gao Fengjiao

Author Affilications：Institute of Automation of Heilongjiang Academy of Science, Harbin 150090, China

Abstract：The bridge detection accuracy is not high using the exiting methods, especially when positioning result depends on detection window choice in the dry season, and it is easy to fallout when there is island under the bridge. In this paper, a method for automatic recognition of bridges over water is present, based on bridge knowledge models, composed of two steps: detection and location. Shadow features are extracted for the first time to assist location of targets. Extraction of environment elements (water, bridge and shadow) closely related with targets, combined with verification of knowledge and rules improve the positioning accuracy. Experiments are executed on the high-resolution remote image, and the results confirm the validity of the proposed method.
Key word：
remote sensing image
location of bridge target
environment element
shadow feature
View(4160)

Cross-layer throughput optimization for mobile wireless sensor networks

Author：Ding Fan, Zhou Yongming

Author Affilications：School of Physics and Mechanical & Electrical Engineering ,Shaoguan College, Shaoguan 512005, China

Abstract：In this paper ,the throughput of point-to-point link for mobile wireless sensor networks is studied using cross-layer optimization. Firstly,the theoretical throughput expressions is derived. To maximize the throughput, an mathematical optimization framework based on hierarchical optimization is adopted. And then the optimal symbol rate , the optimal constellation size in physical layer and the optimal packet in MAC layer are derived. According to these optimization variables , the cross-layer design can be used for throughput optimization. Finally, a adaptive cross-layer optimization strategy is proposed. Simulation results show that the throughput is significantly improved with the cross-layer design compared with traditional hierarchical optimization.
Key word：
wireless sensor networks
mobility
throughput
cross-layer optimization
View(5522)

Hardware platform design for GPP software-defined radio system based on USB 3.0

Author：Xu Yong1, Qi Xin2, Tao Zhiyong1

Author Affilications：1. Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China; 2. National Laboratory of Information Science and Technology, Tsinghua University, Beijing 100084,China

Abstract：This paper presents a hardware platform based on USB 3.0 interface for the baseband data transmission of software defined radio (SDR) system with general purpose processor(GPP). The platform which is made up of USB 3.0 controller, FPGA and DDRII implements the baseband data transmission of WCDMA under the requirement of high throughput and low latency. According to our analysis and test, the loopback delay time of the platform is around 0.7 millisecond and the throughput of the platform is up to 200 Mb/s, which meets the system requirement of WCDMA.
Key word：
USB3.0
SDR
WCDMA
View(11684)

Research on effective demodulation algorithm of burst MPSK in HF channel

Author：Zhang Ting, Wang Bin

Author Affilications：Institute of Information Engineering, The PLA Information Engineering University, Zhengzhou 450002, China

Abstract：The demodulation of MPSK signals in HF burst communication is presented in this paper. The scheme exploits an accurate carrier estimation algorithm based on the FFT interpolation for carrier recovery with the preamble sequence . It uses the fractionally- spaced equalizer (FSE) for time-recovery and equalization. To mitigate the Inter-symbol interference (ISI), the paper takes the decision feedback equalizer (DFE) with DPLL. The performance of the system in multipath-fading channels was simulated. The results show that the scheme is with low complexity and high convergence rate and the performance is all right.
Key word：
HF burst-mode signal
FSE
DFE
FFT correlation
View(5796)

Broadband class-E high efficiency power amplifier design for VHF

Author：She Guangyi， Fu Songyuan， Xiao Zanliang

Author Affilications：Seventh Research Institute of China Electronic Technology Group Corporation, Guangzhou 510310，China

Abstract：This paper uses ADS(Advanced Design System) software simulation design based on the 28-V MOSFET device VHF band 30 MHz～80 MHz class E switching mode high efficiency power amplifier，The input uses broadband matching，output end of the switch to change the back end of the matching circuit and filter.Circuit measurement:30 MHz～80 MHz output power is 3.2 W～ 7.1 W,efficiency from 30 MHz 71.4% to 80MHz 52.5%, and good modulation linearity, can be applied to the EER transmitter.
Key word：
power amplifier
class-E
VHF
MOSFET
View(5992)

Research on decision feedback equalizer based on unique word for single carrier system in underwater acoustic communication

Author：Zhu Hequn, Hu Xiaoyi, Ma Wenhan, Ren Huan

Author Affilications：Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Xiamen University, Xiamen 361005, China

Abstract：In order to overcome the deep fading caused by the multipath propagation in the underwater acoustic enviroment which hugely destroys the performance of the single carrier system, we proposed, compared and analysed time frequency hybrid feedback equalizer(HDFE) and iterative block decision feedback equalization(IBDFE) based on a kind of unique word(UW) block structure. Simulation results and pool test indicate that IBDFE based on the unique word block structure is a pro-mising technique in the underwater acoustic communication.
Key word：
underwater acoustic communication
single carrier
UW
HDFE
IBDFE
View(2678)

Computer Technology and Its Applications

The optimization of low-power RFID data acquisition system

Author：Cheng Xiaohui，Wei Li

Author Affilications：Guilin University of Technology, Guilin 541004 China

Abstract：The paper analyzes the demand of low-power data sampling system and describes the direction of system optimization. The optimization of hardware circuit design of cluster-head nodes in a wireless network separates polling and data transmission. It shorts the time of data communications and further reduces the power consumption of non-cluster-head node in system under the premise of ensuring reliable wireless data transmission.
Key word：
low power RFID
traditional polling
polling and data transmission separation
View(4586)

Improved genetic algorithm for solving traveling salesman problems in unconnected graph

Author：Kong Lingyi

Author Affilications：School of Management Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710061, China

Abstract：Because the Traditional Genetic Algorithm(TGA) had defects of premature convergence and slow convergence, an improved genetic algorithm(IGA) was put forward. The IGA adopted the chromosome encoding scheme based on sequence of city which traveling salesman passed through, combined stochastic method and greedy method ways to produce the initial populations so as to contain optimal value, avoid infeasible chromosomes and improve the subsequently genetic efficiency. Then, precedence preservation crossover and shift change mutation operations were executed. At the same time, local neighborhood search was introduced to accelerate convergence. Furthermore, the criterion was given to judge whether optimal solution meets unconnected graph constraints or not. Finally, computation results proved the effectiveness of IGA.
Key word：
unconnected graph
traveling salesman problem
improved genetic algorithm
View(4386)

Color image edge detection based on improved Sobel algorithm

Author：Sun Wei1,2, Wang Jing1, Wang Bo1

Author Affilications：1. Information Science of Nanjing College for Population Program Management, Nanjing 210042, China; 2. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract：The traditional image edge detection methods have many shortcomings such as with edge position deviation, edge lost and with discontinuous edges etc. In order to solve such problems a novel method was provided in this article which combined the traditional Sobel gradient edge detection method and image threshold segmentation technique. Compared with the traditional image edge detection methods, it reduces the color edge detection error rate and improves the edge detection performance.
Key word：
Sobel
threshold value
edge detection
View(13546)

An improved anti-collision algorithm based on multi-tree search in RFID

Author：Lin Wei, Li Jingxia, Ye Linfeng

Author Affilications：School of Computer Science,GDUT, Guangzhou 510006, China

Abstract：Multi-tags collision seriously affect the performance of RFID systems,in order to better solve this problem, this paper presents the anti-collision algorithm based on the multi-branch tree search and selects binary tree search and quad tree search algorithm based on the different dynamics of the collision bits,it also references the stack to store query commands to avoid duplication and redundance of search,making the system throughput greatly improve in the case of very large number of tags.
Key word：
RFID
anti-collision algorithm
binary tree search
quad tree search
stack
View(7522)

Recognition of the screen coding based on mathematical morphology

Author：Sun Yanpeng, Xu Jun, Wang Ershen, Wei Yongtao

Author Affilications：College of Electronics Information Engineering , Shenyang Aerospace University, Shenyang 110136, China

Abstract：By choosing appropriate structuring elements, filtering and boundary extraction are achieved, and then by Hough transform, slant correction can be finished successfully. By using of the coordinate orientation method, information bits are amplified, thus eliminate the influence of the deformation of the sample. The compare decoding results shows that the mathematical morphology method has higher recognition rate, shorter recognition time, thus verify this method is effectiveness and practicability.
Key word：
screen coding
mathematical morphology
filtering
edge detection
recognition
View(5464)

Implementation of the improved fast median filtering algorithm based on FPGA

Author：Li Guoyan1, Hou Xiangdan2, Gu Junhua2, Lu Yicai2, Fan Peipei2

Author Affilications：1. School of Electrical Engineering and Automation, Hebei University of Technology, Tianjin 300401, China； 2. School of Computer Science and Software, Hebei University of Technology, Tianjin 300401, China

Abstract：The speed of classical median filtering algorithm is slow because of a lot of sorting and it blurs the image, this paper introduces an improved algorithm by adding threshold comparison to the fast median filtering algorithm, which has a parallel pipeline structure. The improved algorithm is implemented on the platform of field programmable gate array(FPGA).The experimental results show that the improved fast median filtering algorithm not only has less times of comparison but also better quality, meet the requirements of the image pre-processing of real-time over the software version of the same algorithm.
Key word：
median filter
FPGA
fast algorithm
comparison of threshold
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Research and design of the infrared remote control self-learning module which can identify carriers

Author：Cheng Xiaohui, Kang Yanping

Author Affilications：College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China

Abstract：This paper describes a kind of the waveform replication method of infrared remote control self-learning module, which realizes infrared remote control signal carrier recognition and waveform learning. Regarding STC12C5410AD SCM as heart of designing, this module not only brings about infrared remote control signal carrier recognition and waveform learning by combining external interrupt and timer. Having been tested, this module can precisely study waveform of infrared remote control signal and control infrared equipment. It has good versatility and wide range of learning carrier. What’s more, it can be applied to universal remote control and smart home system.
Key word：
SCM
self-learning
carrier recognition
waveform copy
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