Home > Archive > 2014 No. 07

2014 No. 07

Publish Date：2014-07-06
ISSN：0258-7998
CN：11-2305/TN
Prev Next

Embedded Technology

The design of high-speed transmission system of spectrum receiver based on OMAP-L138

Author：Li Chaohai，Luo Chao，Huang Donghui

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

Abstract：Based on TI′s OMAP-L138 dual-core processor, the high-speed transmission system from wireless electromagnetic signal to network spectral information is realized. This paper mainly introduces the connection and software design between the high-speed devices. In the high-speed transmission between ARM and DSP, a dual FIFO shared memory structure is proposed, which greatly improves the performance of dual-core communication. This design greatly improves data throughput of spectrum monitoring capacity, which ensures the possibility for higher bandwidth spectrum monitoring. Besides, the system can be easily extended to other applications, which has a certain reference value.
Key word：
OMAP-L138
high-speed transmission system
shared memory structure
View(7592)

Data hazards elimination of instruction extension interface

Author：Xu Yan，Guo Yihui，Xu Jinfu

Author Affilications：Information Engineering University，Zhengzhou 450004，China

Abstract：In order to solve the problem that it is difficult to extend instructions when developing generic RISC microprocessor, a method of adding instruction extension interface to microprocessor was proposed. The key technology was to eliminate the data hazard when instruction extension interface was added. The processor would run an error or fall efficiency if the data hazard could not be resolved effectively. The structure added instruction extension interface to the microprocessor was introduced. Two types of generic and extended instructions of microprocessor were divided depending on the time the computing results produced. The condition was analyzed about how the data hazard occur when the different types of instruction were execute, and data direction channel was designed in the end. The verification program was written to test the function of the extension of processor instruction and data hazard. The results show that the instruction extension is realized and data hazard is resolved when instruction extension interface is added to the processor.
Key word：
RISC
microprocessor
instruction extension
interface
data hazard
View(8516)

Online monitoring system for urban greening based on embedded technology and IoT

Author：Zhang Feng，Liu Mei

Author Affilications：Guangdong University of Petrochemical Technology，Maoming 525000，China

Abstract：This paper presents online monitoring system for urban greening based on embedded and IoT technology. The network function of the system can provide online monitoring functions and means, monitoring the entire city greening projects in real-time. It provides remote expert guidance planting, watering and intelligent fire alarm and other functions to overcome the inadequacies of the current artificial greening projects and realize the intelligent control of urban greenings. It reduces environmental officials maintain urban greening difficulty, while improving the survival rate and water use efficiency of plants, greatly reduces costs in maintenance green areas, improves air quality and reduces pollution in the city, and provides a relaxing environment for general public.
Key word：
embedded
Internet of Things
wireless sensor network
monitoring system
View(9050)

Embedded system security study on address scrambling

Author：Cai Luting，Xu Jinfu，Ding Qi，Zhang Lichao

Author Affilications：PLA Information Engineering University, Zhengzhou 450000，China

Abstract：To protect the security of address bus and storages in embedded system, an address scrambling method based on memory encryption of embedded system was proposed, which could prevent system from ″known plaintext attack″ by address mix-mapping. Considering the characters of address transmission,Benes network was used to scramble the address carrying out none time-lapse of address scrambling. In addition, to ensure on running system′s security, some changes of initialization were made. Compared with other security design for embedded system, the results proved that address scrambling method proposed in the paper achieved the unity of security and reliability.
Key word：
On-Chip bus
embedded system
address scrambling
storage safety
View(8484)

Research on the embedded platform based on the active safety of vehicle

Author：Liu Jun，Tao Changling，Yu Jiefa，Shi Cunjie

Author Affilications：School of Automobile and Traffic Engineering，Jiangsu University, Zhenjiang 212013，China

Abstract：Preventing vehicle rollover is an important category of the active safety of the vehicle. The rollover warning for a vehicle is an important means to effectively prevent an accident. The development of MEMS sensor make the technology of the monitoring and prediction of the vehicle status develop. This paper studies the monitoring and prediction of the vehicle status，vehicle navigation and vehicle communication platform based on Windows CE 6.0. Based on the platform of Visual Studio 2005′VC++，the application software of the monitoring and prediction of the vehicle status and vehicle communication is designed，which realizes rollover warning，GSM/GPRS communication and GPS parsing in the main controller.These technologies provide certain basis for the development of the vehicle network.
Key word：
rollover warning
vehicle network
vehicular communication
embedded system
View(6630)

Design of flight mill for insect based on agricultural Internet of Things

Author：Zuo Xiangang1，Wang Jianping1，2，Guo Shuai1，Hu Mengjie1

Author Affilications：1.School of Information Engineering, Henan Institute of Science and Technology, Xinxiang 453003，China；2.Wuhan University of Technology, Wuhan 430070，China

Abstract：Flight mill for insect is an important part of agricultural Internet of Things. Monitor agricultural insect is used to provide the agricultural decision by the way of grasping the insect migration patterns of life and the ability to fly. The basic process of flight mill for insect based on the AVR is proposed, and the working principle, design methods, and the hardware and software are explained. The experiment shows that the system has the characteristics of simple structure, high precision, long transmission distance and strong anti-interference ability. It is with popularized prospect.
Key word：
ATMega16
photoelectric sensor
insect flight mill
data acquisition
agricultural Internet of Things
View(9490)

Implementation of FPGA multiboot based on Kintex7 and SPI Flash

Author：Chen Lan1，Li Jiyun1，Zhu Renjie2

Author Affilications：1.School of Electronic Engineer, Shanghai Institute of Technology, Shanghai 201418，China；2.Shanghai Astronomical Observatory, Chinese Academy of Science，Shanghai 200010，China

Abstract：7 series FPGA of Xilinx is the newest series chips, and kintex7 is one of them, which has a great number of programming resources. However, resources could not be satisfied with the demound of the design of a several-mode complicate system. This problem can be solved by FPGA reconfiguration. Several bit files should be stored in the SPI Flash, and user can choose to reconfigure FPGA with the selected bit file on the fly. Reconfiguration of FPGA solves the shortage of programming resources and improves the availability of FPGA programming resources.
Key word：
reconfiguration
FPGA
SPI Flash
Xilinx
View(20010)

Application of Integrated Circuits

Application in base station design based on OP4400 DPD IC

Author：Sun Zhaohui

Author Affilications：Digital Trunking Department，Guangzhou Haige Communications Group Incorporated Company，Guangzhou 510663，China

Abstract：Digital pre-distortion technology is one of the most effective approaches among all RF power amplifier linearization techniques, which is widely used in wireless base station. Optichron′s OP4400 provides a single-chip solution for high efficiency and linearity of power amplifiers. It provides the capability to improve the nonlinear characteristics of the power amplifier and supports multiple modulations. The OP4400′s structure and working principle have been introduced, and the details of design for hardware and software are also described in this paper. The experimental results show that the OP4400 improves the performance of PA obviously and works stably. It has good application value.
Key word：
digital pre-distortion
DPD
OP4400
linearization
RF power amplifier
View(17006)

Design and implementation of blind equalizer based on System Generator

Author：He Zongmiao，Yao Yuancheng，Qin Mingwei

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

Abstract：A high speed blind equalizer based on System Generator software is designed in the xc7z020-1clg484 chip by using MCMA algorithm, parallel architecture and pipeline technology. It is composed of a delay module, a filter module, an error calculation module and a coefficient update module.The blind equalizer, whose data width is 16 bit and order number is 13, can be equalised on the 16QAM and QPSK signals. The input rate reached 69 Mb/s. Results of hardware co-simulation show that design of the high-speed blind equalizer is effective.
Key word：
System Generator
blind equalizer
MCMA algorithm
16QAM
View(7188)

Aliasing effects simulation and suppress of switched capacitor filter

Author：Chen Hailiang1，Liu Xin2，3，Ren Yongfeng2，Qu Lin2

Author Affilications：1.Beijing Institute of Space Long March Vehicle，Beijing 100076，China；2.National Key Laboratory for Electronic Measurement and Technology，North University of China，Taiyuan 030051，China；3.Department of Electrical Information, Taiyuan University of Science and Technology, Taiyuan 030024，China

Abstract：In analog signal conditioning, the hardware design of analog signal filtering circuit is the key technology. The low order active filter circuit can not meet the requirement of attenuation rate in the sensor condition circuit. The high-order integrated switched capacitance filter chip can achieve high accuracy and stability. But because of the sampling characteristics of integrated switch-capacitor filter, there is aliasing phenomenon inevitably. By analyzing the aliasing effect on the filter circuit，quantitative calculation of cutoff frequency of postpositive second-order voltage-controlled low-pass filter is given. The experiments show that this design method can effectively suppress the aliasing effect in switch capacitor filter circuit.
Key word：
integrated switch-capacitor
aliasing
low-pass filter
step noise
View(9352)

Hardware design of programmable graphics system in heterogeneous multi-core SoC

Author：Zhou Jianwei1，Han Jungang1，Li Tao1，Du Huimin2，Jiao Jiye1

Author Affilications：1.School of Computer，Xi′an University of Posts & Telecommunications, Xi′an 710061，China；2.School of Electrical Engineering，Xi′an University of Posts & Telecommunications，Xi′an 710061，China

Abstract：Based on the Linux operating system platform and open source LEON3 processor, combined with programmable Graphics processor designed by Xi′an University of Posts Telecommunications, a heterogeneous multi-core SoC is implemented in DNV6_F2PCIE development board made by Dini Group. Running various OpenGL 2D and 3D programs on the SoC through the mouse, keyboard and display，the hardware design of graphics processing unit is validated sufficiently.
Key word：
graphics processing unit
LEON3 processor
heterogeneous multi-core
Linux operating system
View(8808)

Design of full search motion estimation hardware circuit based on FPGA

Author：Tong Zhen，Wang Zuqiang，Yang Heng

Author Affilications：School of Information Science and Engineering, Shandong University, Jinan 250100，China

Abstract：A hierarchical two-dimensional array full search motion estimation(ME) hardware circuit is designed in this paper. Compared with traditional two-dimensional array full search circuit, the improvement of PE parallel structure design and storage design saves hardware resources and coding time. According to the timing relationship of each module, the parallel pipeline structure is reasonable organized. The circuit can deal a column of pixels in one cycle and realizes ME real-time encoding.
Key word：
hierarchy
two-dimensional array
full search ME hardware circuit
parallel processing
View(6054)

LLC resonant half-bridge application designed on electric vehicle charger

Author：Ke Zhonglai，Qi Zhidong，Geng Zhongxing

Author Affilications：College of Automation，Nanjing University of Science and Technology，Nanjing 210094，China

Abstract：In order to improve the efficiency of the electric vehicle charger and ensure the charging device safe and reliable operating, the basic structure and working theory of half-bridge LLC resonant network have be discussed and analysed. At the time, digital chip ARM9 series is used to satisfy frequency conversion of master chip UC3846. As a result, soft switching control at full load range is achieved on this electric vehicle charger system and it also meets the needs of charging voltage and current real time，as well as intelligent control and protection. Finally, the experimental prototype test results are provided to prove the accuracy and reliability of this circuit design.
Key word：
LLC resonant half-bridge
variable frequency design
intelligent control and protection
View(19944)

Design of the high-speed image transmission system based on LVDS and PCI interface

Author：Zhang Tianwen1，2，Liu Wenyi1，2

Author Affilications：1.Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education, North University of China，Taiyuan 030051，China；2.National Key Laboratory of the Electronic Measurement Technology, North University of China, Taiyuan 030051，China

Abstract：For the situation of large amount of data in digital image processing and transmission fields, and traditional interfaces are unable to meet the high-speed transmission requirements, a high-speed image transmission system based on LVDS and PCI interface is proposed, in which the overall design of the system and each circuit module are described and analysed in detail, and overall system functions are tested. FPGA is regarded as the control core in this transmission system. Seamless data buffering has been achieved by using ping-pong operation. This paper focuses on the LVDS interface and the PCI bus technology so as to ensure high-speed, reliable transmission of image data. The test results show that the system is stable and reliable to implement the transmission of image data, and the maximum transfer rate is up to 18 MB/s，which has certain practical values.
Key word：
LVDS
PCI bus
FPGA
high-speed transmission
View(9064)

Information Security

Express information privacy protection application based on RSA

Author：Wei Qian，Wang Chen，Li Xingyi

Author Affilications：School of Computer Science and Telecommunication Engineering, Jiangsu University，Zhenjiang 212013，China

Abstract：Express is now an important transfer method in people′s lives. How to prevent couriers disclosing customer′s privacy information will be mainly discussed. We have proposed a variant of the rebalancing-RSA algorithm to encrypt your personal information based on RSA encryption and decryption algorithm. For a 1 024 bit RSA modulus, this variant offers encryption speed that are at least 2.6 times faster than that in the original Rebalanced-RSA. The variant algorithm is more suitable for applications which requires a lower cost of encryption and decryption.
Key word：
RSA algorithm
CRT-RSA
express information
cryptanalysis
View(6402)

Research on nonlinear Boolean functions realization of cryptographic algorithms

Author：Chang Zhongxiang，Dai Zibin，Li Wei

Author Affilications：PLA Information Engineering University，Zhengzhou 450001，China

Abstract：In order to enhance the non-linear Boolean functions of cryptographic algorithms to achieve efficiency, this paper designs a serial and-circuit for high-order and the table-based parallelization framework to achieve low-order Boolean function. The paper analyzes the efficiency of different parallelization lookup table to achieve the low-order Boolean function of cryptographic algorithms. The results show that，combined with Shannon decomposition theorem，the processing performance of prorosed parallel archtecture of the lookup table can reach 1.02 GHz, which can not only flexiblely adapte the non-linear Boolean function, but also save resource consumption.
Key word：
nonlinear Boolean function
lookup table
parallelization
adaptation
View(6440)

Research and implementation of the shift and p-sequence permutation united architecture based on Butterfly network

Author：Zheng Chengwei，Chen Tao，Dai Zibin，Li Wei

Author Affilications：PLA Information Engineering University，Zhengzhou 450001，China

Abstract：In order to solve the problem of poor flexibility, faulty parallelization and bad expansibility in the current designs, this paper researches the characteristics of Butterfly network. Based on it, the united architecture of shift and p-sequence permutation are designed and implemented and a routing algorithm is analyzed and extracted for it. Compared with traditional logarithmic shifters and barrel shifters, the architecture has better parallelization, higher flexibility and stronger expansibility, and supports short word substitution and multiple parallelization. Compared with the I-BFLY shifter, its area is reduced by 30% and speed is increased by 17.7%.
Key word：
Butterfly network
routing algorithm
shift permutation
p-sequence permutation
multiple parallelization
View(8308)

Chaos encryption system for audio based on FPGA and PSoC

Author：Liu Weiling1，Chang Xiaoming2，Wang Yuncai1

Author Affilications：1.College of Physics and Optoelectronics，Taiyuan University of Technology，Taiyuan 030024，China；2.College of Computer Science and Technology，Taiyuan University of Technology，Taiyuan 030024，China

Abstract：Aiming at problems of vulnerability of software encryption and difficult development of hardware encryption, a hardware implementation scheme about chaotic secure communication is presented in this paper，which is based on FPGA and PSoC. The scheme uses linear feedback shift register（LFSR） to generate chaos pseudo-random sequence and takes PSoC to finish A/D and D/A transformation. The scheme realizes the functions of chaos pseudo-random sequence generation，synchronous control，audio encryption and decryption through FPGA. The way to generate chaos pseudo-random sequence and the principle of encryption and decryption are introduced. And the system design method and implementation program are presented. The experimental results indicate that the system realizes the function of encryption and decryption for audio by chaos. The scheme has a certain reference value for application and development in the field of chaotic secure communication.
Key word：
FPGA
PSoC
chaotic secure communication
encryption and decryption for audio
View(19788)

Measurement Control Technology and Instruments

A design of detecting electric vehicle power battery current system

Author：Shen Yu1, Han Ting1, Wu Ji1,2, Wang Heng1, Zhan Changhui1

Author Affilications：1. Hefei Guoxuan Gao Ke Power Energy Co. Ltd. Hefei 230000, China;2. University of Science and Technology of China, Hefei 230000, China

Abstract：In view of current is one of the important factors affecting the SoC estimation accuracy, propose a optimal method what use the Hall sensor to measure power battery charging and discharging current. The system mainly includes signal regulation, A/D converter and digital isolator, and uses the zero drift current compensation and the average filter to process the acquired current. The project which based on the static temperature drift detection, the static charging current detection and the dynamic driving vehicle detection uses the detecting data of resistance shunt circuit and IT 700-S detected circuit as the reference to verify the accuracy of the scheme measured data.
Key word：
Hall sensor
current detection
SoC
power battery
View(13908)

Design of a new type of intelligent electroacupuncture instrument

Author：Wang Canhua1, Yao Jiaonv2

Author Affilications：1. School of Computer, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004,China;2. School of Humanities,Jiangxi University of Traditional Chinese Medicine, Nanchang 330004,China

Abstract：Aiming at the defects of the traditional electroacupuncture instrument, this paper presents a design of music electroacupuncture instrument based on ARM, analyses the design method of prescription. A total of 75 cervical spondylotic radiculopathy patients were randomly divided into music1 group, music2 group and pulse group, with 25 cases in each group. Clinical test show that the prototype developed is not only intelligent but also has the advantages of simple operation and the treatment effect is significant.
Key word：
electro acupuncture
ARM
1/f fluctuation
View(10634)

Human gesture real-time recognition system based on DSP

Author：Qin Qin,Li Yanwei

Author Affilications：College of Computer,Henan Institute of Engineering,Zhengzhou 451191,China

Abstract：In view of surface electromyography (SEMG) non-stationary characteristics,higer dimenasion of wavelet packet transform coefficients and low recognition rate,a portable human gesture real-time recognition system based on TMS320VC5502 DSP processor hardware platform is designed,and a new method of SEMC signal feature recognition which is combined wavelet packet principal componet analysis (WPPCA) and linear discriminant analysis (LDA) is proposed.Experiments show that this method can reduce the wavelet packet coefficient matrix of surface EMG signal from 16 dimensional to 4 dimensional,and successfully identify four kinds fo motions such as hand grasping,hand opening,radial flexion and ulnar flexion,and action recogniion rate is up to 99.5%,which has a higher recognition rate comparing to the traditional wavelet packet transform,this algorithm.
Key word：
principal component analysis
action recognition
SEMC
linear discriminant analysis
device control
View(15808)

Design and implementation on an integrated multi-interfaces test platform for avionics network

Author：Liu Zhiwu, Wang Hongchun, Chen Changsheng

Author Affilications：AVIC Computing Technique Research Instiute, Xi’an 710119, China

Abstract：Based on the avionics network structure of most advanced airplane, analysis the characteristics and basic function for avionics networks test platform. Design an integrated,multi-interfaces and dynamic configured avionics networks test platform,which can support communication test for multi-type data interfaces, avionics system simulation and avionics system validation. The platform uses the pin program method to chose the test configurations and test cases. Implement hardware and test software of the designed test platform, which acquire good test results in the avionics network test engineering projects.
Key word：
avionics network
test platform
multi-interfaces
AFDX network
View(8408)

Design of water supply network operation data acquisition system

Author：Li Zhonghu1, Cai Zhiquan1,2, Gu Dongyang1

Author Affilications：1. School of Information Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Shou gang Jing tang United Iron and Steel Co., Ltd, Tangshan 063000, China

Abstract：In order to guarantee the safe operation of water supply network, water supply department needs to monitor pipe network pressure, flow, temperature and other parameters for real-time. According to the specific location of dispersed water supply network, designed a kind of intelligent multi detector signal detection scheme based on wireless communication technology. The system can not only realize condition monitoring network of water supply, but also timely the network data is sent to the monitor center, and provide the scientific basis for the operation of water supply pipeline.
Key word：
water supply network
wireless communication technology
itinerant detector
monitor
View(7290)

Circuit breakers’ fault diagnosis based on RBF neural network and expert system

Author：Liu Zenghuan， Li Zhenzhen

Author Affilications：School of Information and Electrical Engineering, Hebei University of Engineering， Handan 056038，China

Abstract：Based on RBF neural network expert system in knowledge representation, knowledge acquisition, parallel reasoning, adaptive learning, the ideal reasoning, and fault-tolerant has demonstrated a clear superiority.Based on RBF neural network expert system overcome the knowledge and expression , and experts need to solve the problem instances or examples to train it, so that in the case of the same neural input network given by the same output as much as possible. From the data,we can learn the states of this system and the circuit breaker is faulty or no,the fault type and fault location.And slove the problems for appropriate action according to the reason of the fault.
Key word：
RBF neural network
fault diagnosis
knowledge base
normalization: the test sample
View(5524)

Design for direct torque controlled brushless DC motor

Author：Miao Jingli, Zou Jing

Author Affilications：School of Information and Electrical Engineering, Hebei Handan, Hebei University of Engineering, Handan 056038, China

Abstract：The Anti-windup PI saturated controller was applied to the direct torque control system of the brushless DC motor. According to the output of the controller is saturated, the controller selects the control structure. Based on the variable-structure controller, the whole system can suppress the windup phenomenon. At the same time, the control parameters were adjusted online by taking advantage of the fuzzy theory. The simulation results show that the control strategy has a nice effect on restraining the saturation and makes the whole system less overshoot, good robustness steady-state performance and so on.
Key word：
brushless DC motor
direct torque control
saturated nonlinear part
Anti-windup PI controller
fuzzy control
View(11420)

Communication and Network

Enhanced evolving graph-based routing algorithm for VANETs

Author：Zhao Jihong1,2, Chen Chun1

Author Affilications：1. School of Telecommunication and Information Engineering, Xi′an University of Posts & Telecommunications,Xi′an 710061, China;2. School of Electronic and Information Engineering, Xi′an Jiaotong University, Xi′an 710049, China

Abstract：Evolving graph can reflect the change of network topology for a period of time, that be used to study highly dynamic network topology of vehicular network routing mechanism. We proposed enhanced evolving graph–based routing algorithm for VANETs, and modeled enhanced evolving graph that can adapt different scenes. Then in order to improve routing reliability, we researched enhanced evolving graph-based routing algorithm. From the simulation results, our proposed algorithm outperforms the referenced protocol on data delivery ratio, routing requests ratio and end to end delay.
Key word：
VANETs
routing
enhanced evolving graph
View(6100)

Study on channel capacity in imaging MIMO communication

Author：Fu Hongshuang1, Zhu Yijun1, Wang Hongmei2, Cai Wenbing3

Author Affilications：1. Institute of Information System Engineering, Information Engineering University, Zhengzhou 450002, China;2. No. 92512 Force, Ningbo 315000, China;3. Beijing Institute of Tracking and Telecommunication Technology, Beijing100094, China

Abstract：Imaging MIMO is a novel method to realize high-speed long-distance visible light communication (VLC). Lens blur due to focus imperfection or jerks can significantly depreciate the image quality, produce spatial inter-symbol interference (SISI), and further affect the communication efficiency. A communication model based on visual MIMO is introduced and the noise and channel capacity of visual MIMO system are analyzed. The channel capacity and signal noise ratio(SNR) of established channel model vs. transceiver distance and receiver units is derived and the effect of SISI on channel capacity is analyzed. Moreover optimizing the size of receiver units can reduce the effect of SISI.
Key word：
visible light communication
imaging MIMO
channel capacity
spatial inter-symbol interference (SISI)
LED array
View(6266)

Pilot design for NC-OFDM system based on discrete particle swarm optimization

Author：Sun Hui, Yang Shouyi, Mu Xiaomin

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

Abstract：We can design pilot tones with particle swarm optimization for the reason that pilot position design is a kind of combinatorial optimization in the NC-OFDM system. The problem of pilot design was converted into a deterministic mathematic model and was solved by discrete swarm optimization algorithm. Simulation shows this method could achieve good MSE performance and bitter error rate(BER) performance.
Key word：
NC-OFDM system
pilot
discrete swarm optimization
MSE
BER
View(8442)

Effectiveness evaluation for aircraft and combat application based on data link

Author：Niu Dezhi1, Chen Changxing1, Xu Haoxiang2, Li Yongbin2, Wang Xujing1, Qu Kun1

Author Affilications：1. Science College, Air Force Engineering University, Xi′an, 710051, China;2. Equipment Management and Safety Engineering College, Air Force Engineering University, Xi′an 710051, China

Abstract：Aiming at aircraft’s effectiveness evaluation and application problem, integrative air combat in circumstance of data link was studied. On basis of logarithm method, aircraft effectiveness evaluation method under data link was given. Value of effectiveness evaluation was converted to average combat level, military force change problem in air combat process was modeled. Simulation analyzes how similar force ratio, data link, different reinforcement time influence air combat result. Effective reinforcement time range and local optimum reinforcement time got by simulation would provide references for conducting and deciding in air combat.
Key word：
data link
effectiveness evaluation
average combat level
local optimum
View(9706)

Maritime mobile channel transmission model based on ITM

Author：Zhao Yuwei， Chi Xun， Ren Jia

Author Affilications：College of Information Science and Technology, Hainan University, Hainan 570228, China

Abstract：Aiming to characteristics of transmission path loss in mobile channel which is caused by complex electromagnetic environment on an open sea area, an improved Irregular Terrain Methodology(ITM) model is proposed in this paper. The algorithm first uses a Two-Path Model to calculate the transmission loss in 1 km distance on maritime; Secondly , by adding rain loss, the characteristics of radio wave propagation on an open sea was corrected; Finally, it compares the results obtained by the standard ITM model and improved ITM model on simulation software. The results show that the improved ITM model can better reflect the characteristics of pelagic mobile channel, and can improve the quality of mobile channel transmission compared with standard ITM model.
Key word：
attenuation
path loss simulation
maritime mobile communication
radio wave propagation
View(9306)

The improved lattice-reduction detection in MIMO-OFDM systems

Author：Tian Mucun, Song Ting, Liu Jiangshun, Du jiang

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

Abstract：The channel matrix changes rapidly in MIMO-OFDM systems, which leads to prohibitive complexity of using lattice-reduction detection. Accordingly, an improved algorithm is proposed in this paper. Using this algorithm, the receiver does sorted QR decomposition of the channel matrix firstly, and then adopts the LLL algorithm to process the upper triangular matrix R. In the process of operation, it does not exchange the columns of R and thus eliminates iterations of the LLL algorithm. Simulation results show that the improved algorithm significantly reduces the computational complexity with the same BER performance of lattice-reduction detection.
Key word：
MIMO
OFDM
signal detection
lattice reduction
sorted QR decomposition
View(7102)

Blind detection of STBC-MC-CDMA signals based on EM-SMC method

Author：Liu Jie, Zhang Limin, Zhong Zhaogen

Author Affilications：Department of Electronic Information Engineering of Naval Aeronautical and Astronautical University, Yantai 264001, China

Abstract：This paper introduces an algorithm for blind detection of space-time block coded multicarrier code division multiple access(STBC-MC-CDMA) signals. Firstly, the signal is decomposed by expectation maximization(EM) method according to the number of users, then sequential Monte Carlo (SMC) is used to estimate the unknown parameters, which feedback for the purpose of iterative computation. Simulation results show that the proposed algorithm outperforms other algorithms, when user numbers is less than 10, spreading code length is greater than 16 and SNR is greater than 6 dB, the bit error rate is less than 0.01.
Key word：
EM
SMC
STBC-MC-CDMA
blind detection
View(5654)

Computer Technology and Its Applications

An effective index method providing timely recovery for block-level storage system

Author：Zhang Liang, Cao Shexiang

Author Affilications：Information Engineering College, Huanghe Science and Technology College, Zhengzhou 450063, China

Abstract：The paper presents a hierarchical spatial-temporal index and incremental query method named HSTIM. By partitioning the entire time domain into slices, LBAs are divided into segments with each index file. Retrieval speed can be greatly improved by querying them in parallel. A new variation of overlapping snapshot is presented, which provides efficient incremental query and supports “sliding-bar” recovery, resoving the RPO performance bottleneck in traditional index query. Comparing HSTIM with non-improved OVBT and traditional B+-tree index in many aspects, experiments show that HSTIM can well satisty the index needs of instantly restoring the block-level storage arbitrary history point and has good performance on incremental recovery.
Key word：
storage
recovery
incremental
index
View(14898)

Design and implementation of virtual spectrum instrument based on software radio

Author：Liu Luhua， Tian Zengshan， Hu Hong， Zhou Mu

Author Affilications：Institute of Wireless Location and Space Measurement, Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Abstract：Based on software radio framework and virtual instrument technology, this paper proposes a design of software radio-aided virtual spectrum instrument for different mobile communication systems with variable characteristic and uses the Visual C++6.0 platform for the programming. The front-end of RF parameters are configured by different mobile communication system and the PCIe interface software is used to receive the real-time data. Then, the baseband data is considered for the FFT processing and spectral analysis. The design realizes data storage and the waveform display of the baseband signal in time and frequency domain. It has a consistent performance with real spectrometer, and is easy to handle and has good portability and flexibility.
Key word：
software radio
virtual spectrum instrument
graphic display
Visual C++6.0
View(9510)

A self-embedding robust digital watermarking algorithm with blind detection

Author：Zhao Yuqing

Author Affilications：School of Education and Science, Nanyang Normal University, Nanyang 473061, China

Abstract：In order to achieve the perfectly blind detection of robustness watermarking algorithm, a novel self-embedding robust digital watermarking algorithm with blind detection was proposed in this paper. Firstly the original image was divided to not overlap image blocks and then decomposable coefficients were obtained by lifting-based wavelet transform in every image blocks. Secondly the low-frequency coefficients of block images were selected and then approximately represented as a product of a base matrix and a coefficient matrix using NMF. Then the feature vector represent original image was obtained by quantizing coefficient matrix, and finally the adaptive quantization of the robustness watermark was embedded in the low-frequency coefficients of LWT. Experimental results show that the scheme was robust against common signal processing attacks, meanwhile perfect blind detection was achieved.
Key word：
digital watermarking
self-embedding
perfectly blind detection
lifting-based wavelet transform
non-negative matrix factorization
View(8524)

Research on optimization process of Web page in mobile terminal

Author：Yu Yisheng

Author Affilications：Guangdong Women′s Polytechnic College, Guangzhou 511450, China

Abstract：Diversity mobile terminals and the users′ personalized requirements are challenges for the tradition Web page in the mobile terminal. Since accessing websites from mobile devices may not give the same results and experiences as accessing them from a PC, this article presents a server-side adaptation approach to prioritising adaptive pages to different devices through a prioritisation system. This approach allows users to prioritise page items for different devices, and it reorders, shows, and removes items based on its priority set by users. A performance test is conducted, results demonstrate the usefulness of the prioritisation system and the adaptive pages.
Key word：
mobile terminal
Web page
adaptive display
optimization process
priority
View(5552)

Self-modifying code influence analysis of QEMU translation

Author：Liu Anzhan1,2, Xia Bing2,3

Author Affilications：1. School of Software,Zhongyuan University of Technology, Zhengzhou 450007, China;2. Henan Province Engineering Laboratory of Computer Information System Security Assessment, Zhengzhou 450007, China;3. School of Computer Science, Zhongyuan University of Technology, Zhengzhou 450007, China

Abstract：In binary translation, self-modifying code is a difficult issue and factor that influences the translation efficiency. Many papers introduce the influences of self-modifying code on binary translator, but there are no quantitative research discovered. To address the issues above，using QEMU as the experimentation platform, this thesis has carried on massive tests about the self-modifying and non-self-modifying code, thoroughly analyzed translation time efficiency and the translation block number which is influenced by the self-modifying code. From the research, the speed about procedure execution time increasing with numbers of self-modifying when self-modifying code is executed on QEMU is 5.82 times of the speed when non-self-modifying code is executed on QEMU. Each time there is one more time of self-modifying, the translation block averagely increases 10.51 blocks.
Key word：
binary translation
self-modifying code
QEMU
View(6880)

The research of office server software for maintenance based on social network

Author：Sun Yi, Lei Xiaopei

Author Affilications：Department of Telecommunication and Information Engineering, Xi′an university of Science and Technology, Xi′an 710054,China

Abstract：An office automation system of maintenace is proposed based on mobile social network platform for some problems of traditional maintenance service.This problems include low efficiency, source consumption and other shortcomings. And the server software of this system is designed. It is programmed with Java language in Eclipse platform,and accessed to application interface of Sina micro-blog, eventually running on PC. The server software can achieve real-time processing and tracking during the process of maintenance, and meet the need that the whole service can be controlled,queried and traced back to achieve the history data. The experimental result indicates that this software is more effective for the improvement of community maintenance service.
Key word：
social network
office automation
Java
API
View(5594)

The application of blind source separation in mixed vibration signal separation

Author：Zhang Linying， Su Xinyan， Han Yan， Yao Jinjie

Author Affilications：College of Information and Communication Engineering, North University of China, Taiyuan 030051, China

Abstract：This paper proposes a time delay definite blind source separation algorithm based on rational transfer function in z-transform domain and uses this algorithm to separate signal and noise, transverse wave and longitudinal wave of mixed signal collected by sensors when we explorate the seismic wave. This algorithm is suitable for separating mixed signals in linear nonlinear. Selecting the length of the time delay depends on the length of the vibration signal data to be processed. Simulation results show that the algorithm can effectively separate signal and noise, transverse wave and longitudinal wave of artificial simulation shock wave generated by Matlab, which provides a favorable basis for post-processing and analysis of vibration signal data.
Key word：
linear
nonlinear
blind source separation
artificial seismic exploration
View(7318)

Special Column

Key Technologies of 5G and Its Evolution

Key Technologies of 5G and Its Evolution

High Performance Computing

Processing and Application of Marine Target Characteristic Data

Smart Power

Antenna Technology and Its Applications

Smart Agriculture

5G-Advanced and 6G

5G Vertical Industry Application

Microelectronics in Medical and Healthcare

Key Technologies for 6G

Application of Edge Computing in IIoT

Deep Learning and Image Recognization

6G Microwave Millimeter-wave Technology

Radar Processing Technology and Evaluation

Space-Ground Integrated Technology

Industrial Ethernet Network

5G Vertical Industry Application

High Performance Computing

Innovation and Application of PKS System

FPGA and Artificial Intelligence

5G Network Construction and Optimization

RF and Microwave

Edge Computing

Network and Business Requirements for 6G

5G and Intelligent Transportation

5G R16 Core Network Evolution Technology

Satellite Nevigation Technology

5G R16 Evolution Technology

5G Wireless Network Evolution Technology

5G Network Planning Technology

5G Indoor Coverage Technology

5G MEC and Its Applications

5G Co-construction and Sharing Technology

Expert Forum

5G and Emergency Communication

5G Slicing Technology and Its Applications

Industrial Internet

5G Terminal Key Realization Technology

5G and Artificial Intelligence

5G and Internet of Vehicles

Terahertz Technology and Its Application

Signal and Information Processing

Artificial Intelligence

5G Communication

Internet of Things and the Industrial Big Data

Electronic Techniques of UAV System

Power Electronic Technology

Medical Electronics

Aerospace Electronic Technology

Robot and Industrial Automation

ADAS Technique and Its Implementation

Heterogeneous Computing

2016 IEEE International Conference on Integrated Circuits and Microsystems

ARINC859 Bus Technology

FC Network Technology

Measurement and Control Technology of Bus Network

GJB288A Bus

Key Techniques of 5G and Algorthm Implement

IEEE-1394 Bus

Signal Conditioning Technology of Sensors

AFDX Network Technology

Discrete Signal Processing

Energy-Efficient Computing

Motor control

2012 Altera Electronic Design Article Contest

WeChat shop

License policy