A5100422856- Optical Wireless Communication Technologies
- Advanced Wireless Communication Technologies
- Optical Network Technologies
- Orbital Angular Momentum in Optics
- PAPR reduction in OFDM
- Advanced DC-DC Converters
- High-Voltage Power Transmission Systems
- IoT Networks and Protocols
- Multilevel Inverters and Converters
- Optical Systems and Laser Technology
- Radio Wave Propagation Studies
- Analog and Mixed-Signal Circuit Design
- Wireless Body Area Networks
- Thermal Analysis in Power Transmission
- Power Systems Fault Detection
- Advanced Photonic Communication Systems
- Microgrid Control and Optimization
- Electric Vehicles and Infrastructure
- Lightning and Electromagnetic Phenomena
- Gyrotron and Vacuum Electronics Research
- Magnetic Properties and Applications
- Icing and De-icing Technologies
- Particle accelerators and beam dynamics
- Calibration and Measurement Techniques
- Cooperative Communication and Network Coding
Tianjin University of Technology
2024
Hangzhou Dianzi University
2022-2023
China Power Engineering Consulting Group (China)
2017-2023
Shandong Electric Power Engineering Consulting Institute Corp
2017-2023
Yanshan University
2023
Space Engineering University
2021-2022
Shanghai Jiao Tong University
2020
ZTE (United States)
2020
Peking University
2018
For a digitally controlled dc–dc converter with leading-edge modulation or trailing-edge modulation, due to the delay and different sampled points, its nonlinear behavior magnitude-phase response in high frequency low cannot be accurately depicted by averaged modeling method, but can predicted sampled-data method. However, conventional model is usually more complicated less intuitive, which not conducive presentation of physical meaning design controller for converter. Based on reasonable...
In wireless communication, random access procedure is initialized before a user equipment(UE) starts data transmission. The traditional procedure, which called 4-step Random Access channel(RACH), includes two times of interaction between base station(BS) and UE. this contribution, simplified named 2-step RACH has been introduced, requires only one BS UE, thus can provide benefits in terms signaling overhead, power consumption latency. basic concept RACH, as well the quantitative analysis...
Wireless power transfer(WPT) has been widely concerned, and it is of certain value significance to study how realize constant current output under variable load. In this paper, an adjustable WPT system proposed based on the LCL-LCL compensation topology phase shifting network. order form a close-loop control, voltage are feedback transmit side by linear optocoupler. Furthermore, circuit performance investigated Saber software.
For optical wireless communication (OWC), beam quality factor is used as an important parameter to evaluate the propagation of laser through atmospheric turbulence. The and its effect on are investigated using generalized anisotropic non-Kolmogorov power spectrum such that anisotropy property turbulence, general spectral law, turbulence inner outer scales can be considered together. We derive new expressions for lowest-order Gaussian higher-mode Hermite-Gaussian beam. intensity also...
The four-circuit parallel line on the same tower effectively solves problems faced by reconstruction and construction under condition of increasing shortage transmission corridors. Optimizing conductor phase sequence arrangement multiple lines is conducive to improving electromagnetic electrostatic coupling caused problems. This paper uses ATP-EMTP simulation software build a 500 kV multi-circuit tower. It stimulates induced voltage current values different lengths, spacing, vertical...
Based on the extended Huygens-Fresnel principle and unified theory of polarization coherence, explicit expression cross-spectral density matrix for partially coherent beams in far field is derived. Also, we investigate changes travelling through anisotropic turbulence along horizontal link when source isotropic correlation. Simulation results show strong relevance between states The conditions to be less affected by are given.
A kind of multi-parameter tracking effect evaluation system based on trajectory is presented. Firstly, the principle and mode target miss distance interpretation are expounded. Then structure designed, which consists image module, module result display module. model established, includes five parameters: difficulty, error, stability, equipment field view, time. The interprets task video acquired by optical measuring equipment, then transmits interpreted data to for processing analysis,...
The integrated design of the motor and axial piston pump eliminates coupling structure, resulting in a compact lightweight motor-pump structure. challenge motors overheating has always been major concern. To address this issue, hydraulic oil throughout is utilized for cooling high-speed motor, effectively improving power density heat dissipation capability unit. This approach successfully resolved significant issue motors, leading to enhanced performance concern, entire pump’s cool motor....
The characteristics of cross-correlation function for two receivers at different depths in deep sea are analyzed. For the near surface, peaks close to main peak, which is difficult be distinguished, and their positions change minor with variation source range depth. While large depths, beyond peak separate more apart from when decreases, depth increases or water increases. impact variations vertical sound speed profile on relatively minor. Based these characteristics, a method matching...
The formation mechanism of the resultant electric field is complex under parallel operation extra-high-voltage alternating current (AC)/direct (DC) transmission lines. However, existing methods are computationally expensive and fail to guarantee stability convergency results. To solve this problem, a calculation method with nonuniform grids varying time steps was proposed on basis finite-volume finite-element for calculating ground AC/DC selection initial value space charges setting surface...
Due to the digital control delay and difference of sampling point position, average model cannot accurately describe nonlinear characteristics frequency response controlled Boost converters with Leading Edge Modulation (LEM) Trailing (TEM), while data modeling method can predict due lack simplified high-frequency information analysis. However, sampled has no intuitive physical meaning. In this paper, improved approximation discrete Iterative is used digitally converter. By state variables...
Lightning over-voltage is the major cause of transmission line interruption and main reason that endangers safety reliability system.This paper modelled a single loop overhead 330kV with one ground wire based on ATP-EMTP to search influences lightning wave, amplitude gradient when hit by back overrating voltage.Combining feature fast wave front over voltage analysis model characteristic range application, model, tower surge impedance resistance were established, at same time insulator flash...
We study the polarization changes of partially coherent beams under Tatarskii spectrum model and effect turbulent inner scaler on property. Simulation results show strong correlations between states scaler.
We give the closed-form solution of cross-spectral density matrix a partially coherent beam propagating through anisotropic atmosphere turbulence along horizontal link, and investigate effects source parameters on polarization state beams propagation. The results show that we can improve performance wireless optical communication systems with modulation multiplexing methods by decreasing wavelength or increasing size. characteristic is uniquely determined after sufficiently long propagation...
We investigated the performance of wireless optical communication systems with polarization shift keying modulation when atmospheric turbulence is anisotropic. Based on unified theory and coherence, characteristic crosstalk propagation was shown. Moreover, we explored effects distances turbulent parameters signal-to-noise ratio loss system. The results illustrated that horizontal direction vertical main factor affecting performance. And it more conducive to transmit information anisotropic...
It is a key problem to get the high resolution and large field of view dynamic measurement in ladar technology. In this paper, Charge Coupled Device was synthesized with seams be display unit. A reconstruction method proposed which combines principles synthetic aperture phase retrieval detect particle target. Then non-integer pixel stitching error synthetic-aperture corrected by based on shift theorem Fourier transform. X experiment, correlation coefficient surface l 0.73217 between...