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November 30,2010
Volume 3,Issue 22
Pages -
Subject Area:Control System Emulation Technique,Image Processing,Communications Technology,Communication Transmission Technology,Broadcast and Television Engineering Technology

Title: Design of the speed measuring device of smart model car based on transmission gears

Authors: LIU Wei, ZHU Min
PP: 2372-2375
Abstract: This paper designs a speed measuring equipment applied in ‘Freescale’ cup smart car race. The speed measuring equipment uses the characteristics of launching and gathering light signal of the photoelectric sensor skillfully and combines with the physical characteristics of gear to gather the signal accurately and convert the signal processing into count pulse, then measure the model car speed. The prominent characteristics of the speed measuring equipment are counting accuracy, simple structure, easy installation, low price.
Keywords: automatic control technology; speed measuring devices; transmission gears; smart model car; Freescale; photoelectric sensor

Title: Modeling and identification of brushless DC motor system

Authors: ZHANG Bing, XUE Fangzheng, LI Zushu
PP: 2365-2371
Abstract: After researching of the special torque ripple of brushless direct current motor, the model of brushless direct current motor system has been reduced to a simple state space model which is mutative according to period of time. Further, based on the real rotate speed response, the improved genetic algorithm has been indicated to accurately identify model parameters. For verifying the validity of this method, experiments of comparing this model with other common model have been done. The results of experiments prove that the structure of the model is reasonable and parameters’ identification is precise.
Keywords: control system simulation technology; system modeling; genetic algorithm; torque ripple; modeling identification

Title: Analysis of baseline in spaceborne InSAR system

Authors: GUO Baolong, LI Nan
PP: 2359-2364
Abstract: Based on the basic theory of interferometric synthetic aperture radar (InSAR) system, the height finding errors are discussed, the relations between InSAR signal-to-noise ratio (SNR), range resolution and baseline are also analyzed. The expression of optimum baseline is derived according to the relations between the height measurement error and baseline. The simulation results show good agreement with practical parameter. The expression of optimum baseline given in this paper is critical in spaceborne InSAR system design and performance optimization.
Keywords: automatic control theory; interferometric synthetic aperture radar; spaceborne; interferometry; optimum baseline

Title: DCT digital watermarking algorithm and Matlab simulation

Authors: ZHANG Weidong, XUN Yangyang, FAN Zhuwen, DING Enjie
PP: 2354-2358
Abstract: This paper introduces the principle and application methods of digital watermarking and gives an watermarking algorithm of the digital image which is based on discrete cosine transformation (DCT). According to the actual research, the paper systematically analyzes the algorithm. With Matlab programming tools, this algorithm has realized the embedding and extracting of the digital watermark. And the paper proceeds a attack test to the image. The research confirms that DCT digital watermarking algorithm has better robustness.
Keywords: image processing; digital image; digital watermarking; discrete cosine transformation; Matlab

Title: Study of frequency offset estimation in the progress of cell search in WCDMA system

Authors: GUO Jin
PP: 2347-2353
Abstract: In wideband code division multiple access (WCDMA) system, frequency offset introduced by the cheap crystal oscillator in initial cell search is studied in detail. In view of it, the algorithm based on the fast Fourier transform (FFT) techniques with quadratic interpolation in the frequency domain is mainly presented. After that, the Matlab/C simulation is carried on and the simulation curves are deeply analyzed. It indicates that this algorithm can not only enhance the resolution of frequency offset estimation, but also the estimated frequency offset has high reliability and excellent stability. So this algorithm is feasible.
Keywords: wireless communication technolgy; wideband code division multiple access; synchronization; cell search; frequency offset estimation

Title: SDV-HOP secure localization algorithm in wireless sensor networks

Authors: LI Chunhua, ZHAO Qinghua, WANG Huakui
PP: 2339-2346
Abstract: For the shortages of conventional DV-HOP localization algorithm, a new secure localization algorithm for wireless sensor network SDV-HOP is proposed in this paper. First, an addition of a symmetric password-based encryption and authentication program has been used to defend against spoofing attacks. Secondly, against the wormhole attacks and block attacks, an average hop distance estimation algorithm based on the safe handling has been introduced. By the judgments and comparison of hop distance, suitable distance value for each hop has been selected, so the errors and mistakes caused by wormhole attacks can be avoided effectively. Simulation results show that the secure algorithm not only has high positioning accuracy but also can effectively prevent and resist external attacks.
Keywords: wireless communication technology; wireless sensor networks; SDV-HOP secure localization algorithm; symmetric code encryption; wormhole attack; impersonation attack

Title: The design of RF transceiver module with power amplifier based on nRF905

Authors: LI Bing, LONG Zhaohua, JIANG Guiquan
PP: 2332-2338
Abstract: This paper proposes a design proposal about radio frequency (RF) transceiver module in wireless communication technology which is composed of a single-chip RF transceiver-nRF905 and a power amplifier-PA2460.The module solves the problems about low power and short transmission distance. This paper describes the hardware circuit and software design process of the system.
Keywords: wireless communication technology; nRF905; PA2460; radio frequency transceiver system

Title: Application of RAKE receiver in underground coal mine and the principles of diversity reception

Authors: LIU Qiang, SHEN Zhongze, LIU Xiaowen
PP: 2328-2331
Abstract: According to the principle of RAKE receiver, this paper used the method of diversity reception to effectively reduce the impact of multipath fading. It first described the principle of a multipath diversity technology, namely RAKE receiver in detail, then analyzed its compensation effectiveness for the multipath fading. It also proposed a model of RAKE receiver based on neural network, and made a simulation experiment. The results show that the RAKE receiver can effectively inhibit the multipath interference in underground coal mine and improve the link performance. This RAKE receiver has better BER performance.
Keywords: communication transmission technology; multipath interference; RAKE receiver; neural network

Title: Investigation on scattering from two-layer model of ground-vegetation using Monte-Carlo method

Authors: GUO Lixin, WANG Anqi, LI Qingliang, CHENG Xiangzhe
PP: 2321-2327
Abstract: The Monte-Carlo method is applied to investigate on the properties of electromagnetic scattering from the two-layer vegetation model, where the model is composed of single-layer vegetation and the ground with rough surface. The electromagnetic scattering enhancement caused by the interaction between the scatter and the ground in the two-layer model is considered. The presented algorithm is verified by comparing the numerical simulation to the experimental results. The angular distribution of the bistatic coefficient is also calculated for different polarizations, and the influence of the root-mean-square (rms) height, the correlation length of the ground, the thickness of the vegetation, as well as the moisture of the soil on the scattering coefficient of the two-layer model are mainly discussed.
Keywords: electicmagnetic wave physics; Monte-Carlo method; two-layer vegetation; electromagnetic scattering; ground

Title: Analysis and improvement of p-persistent random announcement based neighbor discovery

Authors: TANG Ying, KUANG Yujun, LONG Keping, YUAN Hong, ZHENG Guoqiang, YANG Gongyan
PP: 2316-2320
Abstract: This paper analyzes existing neighbor discovery algorithm based upon p-persistent random announcement strategy. Simulation results have shown that no universal optimal transmission probability p as stated in current literature exists. And the paper also shows that p-persistent multiple announcement proposed by current literature can not improve neighbor discovery performance since it is equivalent to that of single announcement. Thus, the paper proposes a modified p-persistent random announcement strategy for neighbor discovery. Analysis and simulation results show that the proposed method can effectively improve the performance of the original algorithm.
Keywords: communication and information system; neighbor discovery; p-persistent; collision resolution

Title: The design and implementation of wireless temperature detection system

Authors: BAI Songlin, WU Hao, WANG Tao
PP: 2311-2315
Abstract: As the rapid development of sensor technology and rodio frequency (RF) technology, a variety of distributed temperature monitoring systems based on wireless transmission are widely used in industrial control, irrigation and water conservancy, fire security, intelligent building, environmental monitoring, traffic management, health care, petrochemical industry, food storage and other fields. Based on the analysis and comparison of a variety of integrated temperature sensors, radio frequency transceiver modules, this paper applied DS18B20 module and nRF9E5 module, designed a real-time wireless indoor temperature detection system, and gave hardware and software design process in detail. After changed temperature data into digital information, the sensor sent it directly into RF modules of embedded microcontroller. Compared with the previous system, this system saved the need for analog to digital converter (ADC) and the microcontroller module. The system has good performance in accuracy, real-time, power, cost etc. and commercial applications.
Keywords: communication and information system; wireless temperature detection system; empirical approach; DS18B20

Title: Application of HHT in the voltage-flicker-meter\'s measurement

Authors: LI Ziya
PP: 2305-2310
Abstract: With the help of Matlab simulation tool, simulation on the IEC (International Electrical Commission) model is provided in this paper. Then on the basis of IEC flicker meter, a measurement of voltage flicker which is based on the Hilbert-Huang transform (HHT). Mainly with some special properties of voltage flicker, the treatment is studied and analyzed when HHT analyzes voltage fluctuations. For HHT features, combined with theoretical and simulation results show that, empirical mode decomposition (EMD) as the core component of HHT, whose adaptive features make this treatment method very suitable for the voltage flicker detection. The results of Matlab simulation of HHT show that HHT can be applied to the extraction of the signal. And the error of the data obtained from the results is smaller than the IEC recommendation, which indicates that the resulting visual sensitivity is better than the model provided by IEC, fully in line with IEC standards. Therefore, the HHT method used in the study of flicker meter is desirable.
Keywords: signal detection; Hilbert-Huang transform; voltage flicker; International Electrical Commission standards; Matlab

Title: Development of switch signal detection and control system based on PC serial interface

Authors: JING Xinchong, HU Yu
PP: 2299-2304
Abstract: Switch signal detection and control systems adopt host-slave architecture in the present situation, a new method for detecting and controlling switch signal directly through computer serial interface is proposed. In this method, the computer functions as the main controller, realizing the serial interface signal conversion with the simple discrete electronic component, and detecting and controlling switch signal by programming with MSComm control. The switch signal detection and control system with simple structure is composed of one serial interface module with 4 input channels and 3 output channels and the computer software for detecting and controlling developed with Visual Basic 6.0. The experimental results indicate that this method is practical and feasible in a situation where a computer is indispensable in the application system, and the system features simple structure, strong anti-interference capability, good expansibility, and excellent real-time performance.
Keywords: signal detection; switch signal detection and control system; computer serial port; Visual Basic

Title: Research of admission control based on bandwidth broker

Authors: WANG Qiong, ZHANG Yong
PP: 2293-2298
Abstract: For the requirements of multimedia services and quality of service （QoS） guarantee in the next-generation networks, this paper focuses on admission control (AC) based on bandwidth broker (BB) and researches four common algorithms. Analysis of different algorithms on acceptance rate, average waiting time and the performance of the network utilization are achieved based on NS-2 platform by designing simulation environments and simulation experiments. Finally, this paper concludes the comparation and evaluation of the four algorithms.
Keywords: electronic information science and technology;quality of service guarantee; bandwidth broker; admission control; NS-2

Title: Real-time tactile strip detection based on learning algorithm under affine invariance

Authors: XIAO Han, WANG Zhaozhong
PP: 2287-2292
Abstract: A learning algorithm is proposed to detect tactile strips in real-time to guide the blind along sidewalks. At present feature-based matching algorithms are known for their robustness, but their runtime computational loads are heavy. The learning algorithm can shift much of the computational burden to a training phase, so it is real-time for detection. In order to make it affine invariant and robust enough, data used to train a classifier offline are synthesized by randomized affine transformation. Then the classifier is used to detect the tactile strips online and morphological operations are used to optimize the detected results. Results of the experiments show that this algorithm is accurate, robust and fast enough for frame-rate performance.
Keywords: information processing technology; affine invariance; learning algorithm; tactile strip detection

Title: Research on frequency distortion instrument based on analog-digital multiplication OCF

Authors: JIANG Jijuan, ZHANG Xiaobing
PP: 2280-2286
Abstract: This paper introduced two methods of the design of distortion meter, namely fundamental suppression method, harmonic analysis. Through analysis on the measuring principle of these two methods deeply, it found all strengths and weaknesses of them. Based on the principles and characteristics of analog-digital multiplication optimization correlative filter, this paper put forward a new method of frequency signal distortion measurement. Finally measurement system hardware circuit was designed based on analog-digital multiplication OCF.
Keywords: signal and information processing; analog-digital multiplication; optimization correlative filter; distortion

Title: A PAL video timing signals generating and synthesizing scheme based on CPLD

Authors: TANG Xinxiang, SHEN Weicong
PP: 2274-2279
Abstract: As example to introduce an implementation scheme of low-cost video timing signals generator, this paper mainly discuss about the generating of phase alternating line (PAL) video timing signals and the synthesis of PAL TV signal. The video timing signals generator discussed in this paper is based on Altera’s MAX II complex programmable logic device (CPLD), the reader only has to modify the signals generating program inside CPLD in order to use this scheme in other non-standard video systems.
Keywords: signal and information processing; video timing signal generating; complex programmable logic device; sync signal; blanking signal

Title: Inner knuckleprint verification based on roof edge detector

Authors: ZHANG Yanqiang, SUN Dongmei, QIU Zhengding
PP: 2266-2273
Abstract: A novel biometrics defined as ‘inner knuckleprint’ is presented in this paper. Roof edge detector is used for locating and extracting the inner knuckleprint. Normalized cross-correlation based feature matching and decision fusion scheme are integrated to implement a real-time verification system. The system is evaluated based on the database contains 1 971 image samples from 98 individuals. For single model, the equal error rate (EER) is 2.040 3% to the worst system, while 0.877 8% to the best one, which indicates that the inner knuckleprints are reliable and universal as a biometrics, and demonstrates the effectiveness of the proposed method.
Keywords: signal and information processing; inner knuckleprint; roof edge detector; normalized cross-correlation matching; decision level fusion

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