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Command filter-based I&I adaptive control for mimo uncertain systems with input saturation and disturbances

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Science China(Information Sciences) 2023年第12期66卷 64-79页

作者： Qi HAN Zhitao LIU Hongye SU Xiangbin LIU State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University School of Electronic Information Engineering Beijing Jiaotong University

This paper develops a control strategy based on immersion and invariance(I&I) adaptive methodology for a class of multi-input multi-output(mimo) systems in the presence of parametric uncertainty, input saturation, and external disturbance. To avoid the analytic calculation in the backstepping process, a highgain auxiliary system is constructed to compensate for the effect of command filter error. The first-order command filters are also employed in the construction procedure of the I&I adaptive law to simplify its design and remove the structural conditions on the regressors. A filter-based disturbance observer is developed to counteract the effect of the external disturbance produced by a partially known exogenous *** overcome the input saturation nonlinearity, a smooth function is introduced to approximate the input saturation with an extended state and a bounding estimation law. Stringent analysis guarantees the stability of closed-loop system. Finally, simulated examples confirm the effectiveness of the suggested method.

关键词： adaptive control command filtered backstepping disturbance observer immersion and invariance mimo systems

Output Complementary Sensitivity Shaping for mimo systems without Multiple Experiments

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Output Complementary Sensitivity Shaping for MIMO Systems wi...

Singular Optimal Control for mimo systems with Persistent Disturbances

第37届中国控制会议

作者： Kosuke Yanagawa Kazuhiro Yubai Daisuke Yashiro Satoshi Komada Department of Electrical and Electronic Engineering Faculty of Engineering Graduate School of Mie University

Data-driven controller tuning methods have advantage that there is no modeling error and a designer can choice any controller *** of these methods,the noniterative correlation-based tuning（NCb T）,needs multiple data acquisitions for mimo *** paper proposes to reduce experiment number by regarding input complementary sensitivity function as an cost function and indirectly shaping output complementary sensitivity function by imposing a constraint for a condition number.

关键词： data-driven condition number mimo systems NCbT

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Singular Optimal Control for MIMO Systems with Persistent Di...

Adaptive Control of mimo Mechanical systems with Unknown Actuator Nonlinearities Based on the Nussbaum Gain Approach

2009中国控制与决策会议

作者： De-xin Gao~1,Xiu-hua Dou~1,Qing Yang~2 1.College of Automation and Electronic Engineering,Qingdao University of Science and Technology,Qingdao 266042 ,China 2.Department of Computer Engineering,Qingdao Technological University Qindao College, Qingdao 266106,China

＜正＞Considering the persistent disturbances and the restraint of control variables in multivariable time-varying systems,an approximate singular optimal control method is presented,which makes use of a non-singular control problem instead of singular ***,this method presents the sufficient and necessary condition for the existent of non-singular optimal control *** the approximate optimal control law is obtained by optimizing according to the restraint of control variables,which improves the singular control *** simulation result demonstrates its effectiveness.

关键词： Persistent disturbances mimo systems singular optimal control control constraint

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IEEE/CAA Journal of Automatica Sinica 2016年第1期3卷 26-34页

作者： Ci Chen Zhi Liu Yun Zhang C.L.Philip Chen Shengli Xie School of Automation Guangdong University of Technology IEEE Faculty of Science and Technology University of Macao Guangdong Key Laboratory of IoT Information Processing

This paper investigates mimo mechanical systems with unknown actuator nonlinearities. A novel Nussbaum analysis tool for mimo systems is established such that unknown time-varying control coefficients are tackled. In contrast to existing literatures on continuous-time systems, the newly-developed Nussbaum tool focuses on extending the traditional Nussbaum result from one dimensional case to the multiple one. Specifically, not only the multiple unknown input coefficients are extended to the time-varying, but also the limitation of the prior knowledge of coefficients' upper and lower bounds is removed. Furthermore, an adaptive robust controller associated with the proposed tool is presented. The asymptotic tracking of mimo mechanical systems is guaranteed with the help of the Lyapunov Theorem. Finally, a simulation example is provided to examine the validity of the proposed scheme. © 2014 Chinese Association of Automation.

关键词： Actuators Adaptive control systems Control nonlinearities Mechanical actuators Mechanics mimo systems Time varying control systems

Improved iterative breadth-first detection algorithms for mimo wireless systems

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High Technology Letters 2007年第2期13卷 184-188页

作者：郑武 Song Wentao Zhang Haibin Xu Youyun Electronic Engineering Department of Shanghai Jiaotong University Shanghai 200240 P.R.China Research and Innovation Center Alcatel-Shanghai Bell Co.Ltd. Shanghai 201206P.R.China

A reduced-complexity detection algorithm is proposed, which is applied to iterative receivers for multiple-input multiple-output （mimo） systems. Unlike the exhaustive search over all the possible trans-mitted symbol vectors of the optimum maximum a posteriori probability （MAP） detector, the new algo-rithm evaluates only the symbol vectors that contribute significantly to the soft output of the detector. The algorithm is facilitated by carrying out the breadth-first search on a reconfigurable tree, constructed by computing the symbol reliability of each layer based on zero-forcing criterion and reordering the symbols according to the symbol reliabilities. Simulations are presented and the good performance of the new algo-rithm over a quasi-static Rayleigh channel even for relatively small list sizes are proved.

关键词： concatenated codes mimo systems BLAST iterative decoder Turbo codes

Angle estimation for bistatic mimo radar with unknown mutual coupling based on three-way compressive sensing

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Journal of systems Engineering and Electronics 2017年第2期28卷 257-266页

作者： Xinhai Wang Gong Zhang Fangqing Wen De Ben Wenbo Liu Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationNanjing University of Aeronautics and Astronautics Nanjing 210016 China Electronic and Information School Yangtz University Jingzhou 434023 China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The problem of angle estimation for bistatic multiple-input multiple-output radar in the present of unknown mutual coupling (MC) is investigated, and a three-way compressive sensing (TWCS) estimation algorithm is developed. To exploit the inherent multi-dimensional structure of received data, a trilinear tensor model is firstly formulated. Then the de-coupling operation is followed. Thereafter, the high-order singular value decomposition is applied to compress the high dimensional tensor to a much smaller one. The estimation of the compressed direction matrices are linked to the compressed trilinear model, and finally two over-complete dictionaries are constructed for angle estimation. Also, Cramer-Rao bounds for angle and MC estimation are derived. The proposed TWCS algorithm is effective from the perspective of estimation accuracy as well as the computational complexity, and it can achieve automatically paired angle estimation. Simulation results show that the proposed method has much better estimation accuracy than the existing algorithms in the low signal-to-noise ratio scenario, and its estimation performance is very close to the parallel factor analysis (PARAFAC) algorithm at the high SNR regions. © 2017 Beijing Institute of Aerospace Information.

关键词： Channel estimation Codes (symbols) Compressed sensing Cramer Rao bounds Feedback control mimo radar mimo systems Radar Radar signal processing Signal reconstruction Singular value decomposition Telecommunication repeaters Tensors

On the mimo channel capacity saturation for spatially constrained receive region

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Journal of systems Engineering and Electronics 2007年第3期18卷 437-442页

作者： Wu Yujiang Nie Zaiping School of Electronic Engineering Univ. of Electronic Science and Technology Chengdu 610054 P. R. China

In mimo wireless communication systems, when more and more antennas are packed into spatiallylimited receive region, the antenna saturation phenomenon will appear. Moreover, the electromagnetic interactions among antennas will also become stronger and stronger and affect the antenna saturation effect considerably. Despite this, few studies consider these two effects jointly. The effects of antenna saturation are investigated under the consideration of mutual coupling, thus a more practical and physically meaningful result can be obtained.

关键词： mimo systems capacity saturation mutual coupling spatially constrained array.

A New Indirect Adaptive Fuzzy Control for a Class of mimo Nonlinear Discrete-Time systems

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A New Indirect Adaptive Fuzzy Control for a Class of MIMO No...

Multiuser beamforming based on max SINR for downlink spatial multiplexing mimo

第三十届中国控制会议

作者： SHI Wuxi School of Electrical Engineering and Automation,Tianjin Polytechnic University,Tianjin 300160,P.R.China

＜正＞A new indirect adaptive fuzzy control scheme is developed for a class of nonlinear discrete-time multi-input multi-output *** avoid the possible controller singularity problem,the controller,which is designed by fuzzy logic systems,is derived from quadratic performance index,and the time-varying gain adaptive laws are used to adjust the unknown parameters. The proposed design scheme guarantees that all the signals in the resulting closed-loop system are bounded,and the the estimated value of generalized tracking error converges to a small neighborhood of the origin.

关键词： Discrete-time systems mimo systems Adaptive Fuzzy Control Time-Varying Gain Adaptive Laws

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 28-33页

作者： MA Peng-fei ZHENG Kan WANG Wen-bo Wireless Signal Processing and Network Laboratory Beijing University ofPosts and Telecommunications Beijing 100876 China

In this article, a method based on max signal interference noise ratio（SINR） criterion is proposed, to mitigate the interuser interference for downlink multiuser spatial multiplexing multi-input multi-output（mimo） systems. Unlike the zero forcing （ZF） scheme in which the SNR is decreased when the interference is eliminated completely, max SINR method makes a compromise between noise and interuser interference. When the number of substreams is larger than the difference between the number of base station antennas and the sum of interference mobile station antennas, the ZF is infeasible An existing coordinated TX-RX block diagonalization（COOR BD） method uses preprocessing at the receiver to cancel the interuser interference. However, it cannot obtain more receive diversity gain because of the preprocessing. Analysis and simulation show that the max SINR scheme has better performance than the ZF method. Moreover, when the ZF is infeasible, the max SINR scheme can obtain more receive diversity gain than COOR BD in the two-user case.

关键词： array signal processing beamforming mimo systems spatial multiplexing