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Adaptive Robust Servo Control for Vertical Electric Stabilization System of Tank and Experimental Validation

Defence Technology（防务技术） 2024年第1期31卷 326-342页

作者： Darui Lin Xiuye Wang Yimin Wang Guolai Yang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

A tracking stability control problem for the vertical electric stabilization system of moving tank based on adaptive robust servo control is addressed.This paper mainly focuses on two types of possibly fast timevarying but bounded uncertainty within the vertical electric stabilization system:model parameter uncertainty and uncertain nonlinearity.First,the vertical electric stabilization system is constructed as an uncertain nonlinear dynamic system that can reflect the practical mechanics transfer process of the system.Second,the dynamical equation in the form of state space is established by designing the angular tracking error.Third,the comprehensive parameter of system uncertainty is designed to estimate the most conservative effects of uncertainty.Finally,an adaptive robust servo control which can effectively handle the combined effects of complex nonlinearity and uncertainty is proposed.The feasibility of the proposed control strategy under the practical physical condition is validated through the tests on the experimental platform.This paper pioneers the introduction of the internal nonlinearity and uncertainty of the vertical electric stabilization system into the settlement of the tracking stability control problem,and validates the advanced servo control strategy through experiment for the first time.

关键词： Adaptive robust servo control Experimental validation nonlinearity compensation System uncertainty Vertical electric stabilization system

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Constellation shaping optimization for nonlinearity mitigation in CAP UVLC system

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Science China(Information Sciences) 2023年第9期66卷 274-290页

作者： Junlian JIA Junwen ZHANG Nan CHI Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan University Shanghai Engineering Research Center of Low-Earth-Orbit Satellite Communication and Applications Shanghai Collaborative Innovation Center of Low-Earth-Orbit Satellite Communication Technology Peng Cheng Laboratory

In the sixth-generation communication(6G), wireless communication will cover not only conventional air links but also underwater links. Underwater visible light communication(UVLC) is an expected technique that achieves a high data rate. However, UVLC systems suffer from severe nonlinear distortions for the high-power transmitting, thus nonlinear compensation is vital to the system. Carrier-less amplitude and phase(CAP) modulation is a promising modulation, especially for the scenes with high nonlinear effects.In this paper, for the first time, we proposed a constellation optimization method for the UVLC system supporting the native artificial intelligence in 6G. The proposed framework, based on the complete process of the CAP modulation and demodulation, fulfills an end-to-end learning scheme with a neural network at the transmitter side and the conventional demodulation processes at the receiver side. A loss function is further designed to support the training without needing a fixed signal-to-noise ratio(SNR). The proposed framework is simulated and then tested in an experiment. In a 1.2-meter nonlinear UVLC channel, compared with 1.5 Gbit/s supported by the conventional grid encoding, the proposed method brings an extra 200 Mbit/s data rate.

关键词： underwater visible light communication nonlinearity compensation constellation optimization

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Computationally Efficient nonlinearity compensation for Coherent Fiber-Optic Systems

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ZTE Communications 2012年第3期10卷 12-15页

作者： Likai Zhu Guifang Li CREOL The College of Optics and PhotonicsUniversity of Central Florida4000 Central Florida BoulevardOdandoFlorida 32816USA

Split-step digital backward propagation （DBP） can be combined with coherent detection to compensate for fiber nonlinear impairments. A large number of DBP steps is usually needed for a long-haul fiber system, and this creates a heavy computational load. In a trade-off between complexity and performance, interchannel nonlinearity can be disregarded in order to simplify the DBP algorithm. The number of steps can also be reduced at the expense of performance. In periodic dispersion-managed long-haul transmission systems, optical waveform distortion is dominated by chromatic dispersion. As a result, the nonlinearity of the optical signal repeats in every dispersion period. Because of this periodic behavior, DBP of many fiber spans can be folded into one span. Using this distance-folded DBP method, the required computation for a transoceanic transmission system with full inline dispersion compensation can be reduced by up to two orders of magnitude with negligible penalty. The folded DBP method can be modified to compensate for nonlinearity in fiber links with non-zero residua dispersion per span.

关键词： coherent fiber communication nonlinearity compensation folded digital backward propagation

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Design of RH Measuring Instrument Circuit Based on Hygristor

Design of RH Measuring Instrument Circuit Based on Hygristor

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The Sixth International Conference on Measurement and Control of Granular Materials

作者： Ge Jiayi Sha Zhanyou An Shengbiao Hebei University of Science and Technology,Shijiazhuang,050054,China

It is essential to measure the humidity accurately in the trades,such as dustlike object detection,weather forecast,bio-pharmaceuticals, food processing and paper-making,etc.The circuit design and calibration method of a kind of relative humidity instrument are introduced.This instrument consists of hygristor sensor,accurate symmetrical square wave generator,logarithm amplifier,relative humidity calibration circuit, setpoint amplifier,temperature compensation circuit and digital voltmeter.It has the remarkable merits of high accuracy,fine linearity,the readout independent of temperature, low cost and easy popularization etc.

关键词： Relative Humidity Hygristor nonlinearity compensation Temperature compensation setpoint amplifier

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Distributed Nonlinear Phase Noise compensation for Coherent Optical OFDM through Post Signal Processing

Distributed Nonlinear Phase Noise Compensation for Coherent ...

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第十七届全国青年通信学术年会

作者： Yiran Ma and Junjie Li Network Technology Department,China Telecom Beijing Research Institute,Beijing,China

We demonstrate a distributed nonlinearity compensation technique for 10.7 Gb/s coherent optical OFDM signals after 1000 km transmission.Over 2dB Q improvement has been observed after two-step compensation.

关键词： Coherent communication Recirculation loop OFDM nonlinearity compensation

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