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Digital down conversion of the SIMULINK modeling and FPGA implementation

Digital down conversion of the SIMULINK modeling and FPGA im...

引用

SPAWDA Symposium on Piezoelectricity, Acoustic Waves, and Device applications

作者： Hong Sun Hong He Li Li Tianjin Key Laboratory of Control Theory and Application in Complicated Systems Jiuquan Tianjin University of Technology Tianjin China

Digital down converter is the core technology of soft radio receivers. It lets the high-speed-sampled digital signals down-conversion to base band down at first. Then extraction, low-pass filter are conducted. This paper focuses on modeling and simulation by SIMULINK of digital mixing converter part and CIC decimation filter part of digital down converter and the realization on FPGA. The results show that the digital down-conversion, to reduce redundant data extraction method, can effectively solve those issues of too large computation pressure and too broad frequency-band channel encountered in the conventional A/D sampling DSP digital signal processing.

关键词： Field programmable gate arrays Digital signal processing Data mining Low pass filters Frequency Bismuth Laboratories control theory Receivers Computational modeling

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Study on the Design of LAS Code in the LAS-CDMA

Study on the Design of LAS Code in the LAS-CDMA

引用

International Forum on Information Technology and applications, IFITA

作者： Kai Mo Hong He Li Li Xianwei Zhu Institute of Economic Reform Tianjin China Tianjin Key Laboratory of Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin China

The paper mainly studies the designs of LA, LS and LAS codes. Then it makes simulation for theirs auto-correlation functions and cross-correlation functions. Simulation and analysis show that, LAS code has zero cross-correlation in the "zero interference window", and has only an impulse auto-correlation in the "zero interference window", and these excellent features help to eliminate ACI, MAI and ISI, thus it increases the system capacity largely. So it has more large potential than traditional codes.

关键词： Autocorrelation Interference elimination Multiaccess communication Spread spectrum communication Information technology Multiple access interference Intersymbol interference Paper technology Laboratories control theory

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VRS technology based on multi-base station network and its error analysis

VRS technology based on multi-base station network and its e...

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SPAWDA Symposium on Piezoelectricity, Acoustic Waves, and Device applications

作者： Hong He Hao Liu Da-Jian Zhang Bao-Feng Zhang Yong Tian Ke-Xi Wang Hui Meng Ming-Feng Hou Tianjin Key Laboratory of Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin China Research Institute of Measure Technology Tianjin China

The existing problems of conventional RTK in actual applications specifically indicate that the difference technology can only eliminate the public error between base station and subscriber station under certain conditions. With the increases of baseline length (more than 20 km), the correlation of errors between tropospheric and ionospheric weakens or even disappears such that, the differential GPS technology loses its theoretical foundation. The experimental analysis shows that in network RTK, the Virtual Reference Station RTK technology enables VRS technology to extend the effective distance from 15 km to 50 km or more, and thus, to greatly enhance the relative positioning accuracy in medium-baseline and long-baseline (20~50 km).

关键词： Error analysis Electromagnetic propagation Global Positioning System Electrons Ionosphere Electromagnetic scattering Frequency Refractive index Laboratories control theory

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Discrete Chaotic Synchronization and Secure Communication Design

Discrete Chaotic Synchronization and Secure Communication De...

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International Conference on Natural Computation (ICNC)

作者： Hong He Yi Wu Baofeng Zhang Dajian Zhang Yong Tian Kexi Wang Hui Meng Mingfeng Hou Tianjin Key Laboratory of Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin China Research Institute of Measure Technology Tianjin China

ISBN: (纸本)9781424445424

In recent years, secure communication is becoming one of the researching hotspots in information safety. Some problems of chaotic synchronization and its application in communication are studied on the bases of the theory of nonlinear dynamics. It is a mode of correspondence, which transmits the desired information in the channel by means of encrypting, and then decrypts them at the receiving end. Chaos encryption is to encrypt the plaintexts and utilize random-like characteristics of chaos signal to secure the real-time communication. This paper bases on nonlinear dynamics theory and starts from stability theory of dynamic system. In addition, it adopts logistic mapping of discrete chaotic system and uses modular operation to design the synchronization and secure communication. This design is easily realization and has stronger anti-interference ability, and then the secure capacity of secure communication system is nice.

关键词： Chaotic communication Cryptography Nonlinear dynamical systems Safety Logistics application software Spread spectrum radar Laboratories control theory Stability

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Simulation for Doppler signal Periodogram Spectral estimation methods

Simulation for Doppler signal Periodogram Spectral estimatio...

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SPAWDA Symposium on Piezoelectricity, Acoustic Waves, and Device applications

作者： Hong He Fang Liu Da-jian Zhang Bao-feng Zhang Yong Tian Ke-xi Wang Hui Meng Ming-feng Hou Tianjin Key Laboratory of Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin China Research Institute of Measure Technology Tianjin China

With the rapid development of modern intelligent traffic, the speed-testing radar becomes a kind of essential equipment, which measures speed through the acquisition of the moving target signal frequency deviation according to Doppler principles. Traditional method uses analog filtering, whose measurement accuracy is low and the measured speed is slow. Obviously, it's difficult to meet the need of the modern intelligent transportation management. Speed radar signal processing generally uses the power spectrum estimation method. Periodogram Spectral estimation (using Hamming window periodogram method) considers for different signal to noise ratio of the data spectral estimation, and finally receives the largest frequency error to meet the system requirements for measurement accuracy.

关键词： Velocity measurement Frequency estimation Frequency measurement Traffic control Doppler radar Radar equipment Radar measurements Filtering Intelligent transportation systems Power system management

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application of Smart Antenna Interference Suppression Techniques in TD-SCDMA systems

Application of Smart Antenna Interference Suppression Techni...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Hong He Ying He Baofeng Zhang Dajian Zhang Yong Tian Kexi Wang Hui Meng Mingfeng Hou Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin China Research Institute of Measure Technology Tianjin China

The quality of mobile communications have been severely affected by interference among users in TD-SCDMA, in allusion to this problem, the smart antenna adaptive beam-forming algorithm are researched deeply in the thesis. According to the technical features that smart antenna can adaptive track the user signals realize the design and simulation of smart antenna in interference suppression, and compare and analyze the result then prove the advantage and disadvantage of two algorithms. We simulates the adaptive filter with MATLAB, the results prove that it can suppression interference in TD-SCDMA system with the effectiveness.

关键词： Interference suppression Time division synchronous code division multiple access Adaptive arrays Algorithm design and analysis Mobile communication Mobile antennas Signal design Analytical models Signal analysis Adaptive filters

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Study of PID control System for Ant Colony Algorithm

Study of PID Control System for Ant Colony Algorithm

引用

GCIS, WRI Global Congress on Intelligent systems

作者： Hong He Fang Liu Li Li Jin-Rong Yang Lei Su Yi Wu Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin University of Technology and Education Tianjin China Tianjin Power Grid Company Power Test and Research Institute Tianjin China

The key of PID control systematic optimization design is PID parameter optimization. Traditional PID controller parameter adopt experiment to add the way of trying to carry out optimization by man. It is fairly time-consuming, PID controller have no self-adaptive ability, can only rely on artificial optimization parameter. This paper puts forward a kind of algorithm to select the PID parameters based on the crowd algorithm of ant. Scientists have put forward the crowd algorithm of ant by imitating the ant collective in nature and. Imitation research has shown the validity of this algorithm. this algorithm have surmounted the disadvantages of traditional PID regulator parameter optimization.

关键词： Three-term control control systems Ant colony optimization Design optimization Cities and towns Algorithm design and analysis Regulators Robustness Intelligent systems Laboratories

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Digital down conversion of the simulink modeling and FPGA implementation

Digital down conversion of the simulink modeling and FPGA im...

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Joint Conference of the 2009 Symposium on Piezoelectricity, Acoustic Waves, and Device applications, SPAWDA 2009 and 2009 China Symposium on Frequency control Technology

作者： Sun, Hong He, Hong Li, Li Jiuquan Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300384 China Tianjin Tig Construction Co. Ltd. Tianjin 300010 China

ISBN: (纸本)9781424449507

关键词： Finite element method

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The applications and simulation of adaptive filter in noise canceling

The applications and simulation of adaptive filter in noise ...

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International Conference on Computer Science and Software Engineering, CSSE 2008

作者： Ying, He Hong, He Li, Li Yi, Wu Hongyan, Pan Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin University of Technology Tianjin 300191 China Tianjin Radio and TV University Tianjin 300191 China

ISBN: (纸本)9780769533360

In practical application, the statistical characteristics of signal and noise are usually unknown or can't have been learned so that we hardly design fix coefficient digital filter. In allusion to this problem, the theory of the adaptive filter and adaptive noise cancellation are researched deeply in the thesis. According to the LMS and the RLS algorithms realize the design and simulation of adaptive algorithms in noise canceling, and compare and analyze the result then prove the advantage and disadvantage of two algorithms. We simulates the adaptive filter with MATLAB, the results prove its performance is better than the use of a fixed filter designed by conventional methods. © 2008 IEEE.

关键词： Adaptive filters

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application of drilling fluid density detection based on intelligent sensor

Application of drilling fluid density detection based on int...

引用

4th International Symposium on Precision Mechanical Measurements

作者： He, Hong Jia, Hengtian Pan, Hongyan Han, Shenglei Cui, Xin Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300191 China Tianjin Radio and TV University Tianjin 300191 China

This paper introduces a new method to detect drilling fluid density based on intelligent sensor, the core of which is silicon resonant sensor technology. Two H model resonant beams locating single crystal silicon resonant sensor con vert differential pressure to frequency signals respectively, then difference of two frequency signals are transmitted to CPU, export 4~20mA signal corresponding drilling fluid density after D/A converter. This method get over the short comings of typical drilling fluid density detection used piezocapacitive sensor, such as low accuracy, shattered easily, easy drift...ect., has high precision, stability and reliability characters. © 2008 SPIE.

关键词： Single crystals

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