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49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

作者： Miao, Xuan-Wei Zheng, Sheng-Yuan Torkaman, Pouya Feng, Kai-Ming Yang, Shang-Hua Natl Tsing Hua Univ Inst Elect Engn Hsinchu Taiwan Natl Tsing Hua Univ Inst Photon Technol Hsinchu Taiwan

ISBN: (纸本)9798350370331;9798350370324

This study investigates the performance of a multi-channel access solution based on a robust terahertz indoor communication system at 325 GHz with a single-input, single-output (SISO) system. Spatial diversity builds up the possibility of transmission under various channel conditions. The wireless terahertz system comprises a vibration mirror, a blocking object, two motorized stages, and two lenses. The system imitates the actual communication scenarios affected by blockage and misalignment. We adopted three multi-channel strategies: (1) Line-of-sight transmission (2) Reflection transmission (3) Blockage along LOS transmission. With experimental results, we validate our analysis and successfully show that the multi-channel strategies can significantly improve transmission. The SISO system can have a coverage of 115 degrees with a wireless distance of 1.5 meters. The results greatly impact the applications of terahertz indoor communications and provide a physical solution for various transmission conditions.

关键词： Terahertz communication Multi-channel Access single-input single-output system

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Performance evaluation and comparison of spatial modulation and non-DC MIMO m-CAP techniques in indoor VLC system

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IET OPTOELECTRONICS 2019年第6期13卷 281-287页

作者： Nassiri, Mahdi Ashouri, Saeed Baghersalimi, Gholamreza Ghassemlooy, Zabih Univ Guilan Dept Elect Engn Rasht Iran Northumbria Univ Fac Engn & Environm Opt Commun Res Grp Newcastle Upon Tyne Tyne & Wear England

Here, the authors propose and apply two novel schemes of multi-band carrierless amplitude and phase (m-CAP) modulation for spatial modulation (SM)-based visible light communications (VLC) systems. In SM, both spatial and signal constellation are utilised to improve the performance of the m-CAP system. Here, they have adopted the non-DC m-CAP which is a power efficient technique with no DC-bias. The bit error rate (BER) performance and the spectral efficiency of the proposed systems are compared with single-input single-output (SISO) and multiplexing multiple-input multiple-output (MIMO) m-CAP systems. Results demonstrate that non-DC m-CAP, with the same spectral efficiency as that of SISO m-CAP, outperforms other schemes in terms of BER due to its power efficiency;however, a higher spectral efficiency can be achieved by the SM-MIMO m-CAP scheme.

关键词： MIMO communication error statistics SISO communication indoor radio multiplexing phase modulation amplitude modulation free-space optical communication optical modulation signal constellation power efficient technique bit error rate performance indoor VLC system phase modulation single-input single-output system spectral efficiency spatial modulation-based visible light communications systems SM-MIMO systems nonDC MIMO m-CAP techniques BER performanc SISO multiplexing multiple-input multiple-output system

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Iterative Learning Reliable Control Strategy for a Class of SISO systems with Time-Delay and Actuator Faults 9

Iterative Learning Reliable Control Strategy for a Class of ...

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9th IEEE Data Driven Control and Learning systems Conference (DDCLS)

作者： Liu, Heng Wang, Yanjie Zhang, Ruikun Qingdao Univ Sci & Technol Sch Math & Phys Qingdao 266061 Peoples R China Qingdao Univ Sci & Technol Res Inst Math & Interdisciplinary Sci Qingdao Peoples R China

ISBN: (纸本)9781728159225

This manuscript presents an iterative learning control strategy for a class of single-input single-output (SISO) nonlinearly parameterized systems with unknown time-varying state delays and actuator faults. Based on some basic assumptions and the property of the state delays and actuator faults of the SISO nonlinear system, we design the P-type iterative learning reliable controller to deal with the nonlinearity caused by the time-delays term and actuator faults. And then, a composite energy function(CEF) is used to show the convergence property of the state tracking error. Finally, a numerical simulation is used to verify the correctness and effectiveness of control scheme.

关键词： Iterative Learning Control Time-varying state delays Actuator faults single-input single-output system

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Switching tracking control for linear time-invariant systems without overshoot: a positive systems method

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IET CONTROL THEORY AND APPLICATIONS 2019年第7期13卷 952-959页

作者： Zhang, Yaoli Zhao, Jun Northeastern Univ Coll Informat Sci & Engn Shenyang 110819 Liaoning Peoples R China Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang 110819 Liaoning Peoples R China

In this study, the authors study the issue of how to design controllers to asymptotically track a constant signal without overshoot for linear time-invariant systems. Using the theory of positive systems, they obtain the non-negative invariant set of the output for the autonomous systems. Then, a linear state feedback controller is designed to ensure the non-overshooting tracking when the initial state is in some region. Furthermore, for a single-input single-output system, the problem of global non-overshooting tracking control is solved by a switching control law. For multi-input multi-output systems, they also obtain the non-overshooting response under some assumptions. A numerical example is given to illustrate the effectiveness of the proposed theory.

关键词： nonlinear control systems linear systems state feedback closed loop systems feedback MIMO systems control system synthesis switching systems (control) linear time-invariant systems positive systems method nonnegative invariant set autonomous systems linear state feedback controller single-input single-output system nonovershooting tracking control switching control law multiinput multioutput systems nonovershooting response

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Adaptive output-feedback finite-time stabilisation of stochastic non-linear systems with application to a two-stage chemical reactor

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IET CONTROL THEORY AND APPLICATIONS 2019年第4期13卷 534-542页

作者： Sui, Shuai Chen, C. L. Philip Liaoning Univ Technol Informat Comp Sci Jinzhou Liaoning Peoples R China Univ Macau Comp & Informat Sci Macau Peoples R China Dalian Maritime Univ Dalian 116026 Peoples R China Chinese Acad Sci Inst Automat State Key Lab Management & Control Complex Syst Beijing 100080 Peoples R China

In this study, the authors investigate the problem of the stochastically finite-time stability analysis and control design of an adaptive single-input and single-output (SISO) uncertain stochastic non-linear system via establishing a new stability criterion. Owing to the unknown dynamics and unmeasured system variables, fuzzy logic systems and a fuzzy state observer are constructed and applied to identify the stochastic system, respectively. Combining the finite-time definition, stochastic differential equation and $\hat o$o<^> formula, a novel stochastically finite-time stability theorem is raised in this study. By utilising the novel criterion and adaptive backstepping intelligent control, a stochastically finite-time control method is proposed. It is illustrated that the controlled stochastic system is semi-global finite-time stable in probability and behaves excellent convergence. The simulation results of a two-stage continuous stirred tank reactor process reveal the validity and efficiency.

关键词： chemical reactors stochastic systems control system synthesis feedback differential equations adaptive control uncertain systems observers stochastic processes nonlinear control systems stability fuzzy control control nonlinearities probability adaptive output-feedback finite-time stabilisation two-stage chemical reactor uncertain stochastic nonlinear system unmeasured system variables fuzzy logic systems fuzzy state observer stochastic differential equation adaptive backstepping intelligent control two-stage continuous stirred tank reactor process controller design single-input single-output system SISO probability

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Energy and spectral efficiency of secure massive MIMO downlink systems

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IET COMMUNICATIONS 2019年第10期13卷 1364-1372页

作者： Al-nahari, Azzam Sakran, Hefdhallah Su, Weifeng Tarbosh, Sami Ibb Univ Dept Elect Engn Ibb Yemen SUNY Buffalo Dept Elect Engn Buffalo NY USA

Spectral efficiency, energy efficiency, and security are cornerstones for the upcoming 5G systems. In this study, the issue of how the energy and spectral efficiency of multiuser massive multiple-input multiple-output (Ma-MIMO) systems are affected in the presence of a secrecy constraint is addressed. The performance of the two most prominent linear precoding techniques, the matched filter (MF) and zero-forcing (ZF) precoders, for secure downlink multiuser Ma-MIMO in the presence of multi-antenna passive eavesdropper is investigated. The authors consider three performance metrics, namely, the achievable ergodic secrecy rate, the secrecy spectral efficiency (SSE), and the secrecy energy efficiency (SEE), assuming perfect and imperfect channel state information. The tradeoff between SSE and SEE is also studied. Moreover, the authors derive tight lower bounds on the achievable ergodic secrecy rate for MF and ZF precoding techniques. The derived lower bounds provide insights on the tradeoff between the SSE and SEE. It is shown that ZF precoder outperforms MF precoder at high transmit power, whereas at very low transmit power, MF outperforms ZF. Moreover, it is shown that using large number of transmit antennas can improve the SSE and the SEE with orders of magnitude compared to a single-input single-output system.

关键词： precoding transmitting antennas antenna arrays telecommunication security MIMO communication matched filters telecommunication power management energy conservation 5G mobile communication linear codes multiantenna passive eavesdropper achievable ergodic secrecy rate secrecy spectral efficiency secrecy energy efficiency ZF precoding techniques MF precoder single-input single-output system secure massive MIMO downlink systems multiuser massive multiple-input multiple-output systems secrecy constraint 5G systems linear precoding techniques secure downlink multiuser Ma-MIMO systems matched filter zero-forcing precoders performance metrics imperfect channel state information perfect channel state information tight lower bounds

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A generalized smith predictor for unstable time-delay SISO systems

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ISA TRANSACTIONS 2018年 72卷 197-204页

作者： Sanz, R. Garcia, P. Albertos, P. Univ Politecn Valencia Inst Automat & Informat Ind Valencia 46020 Spain

In this work, a generalization of the Smith Predictor (SP) is proposed to control linear time-invariant (LTI) time-delay single-input single-output (SISO) systems. Similarly to the SP, the combination of any stabilizing output-feedback controller for the delay-free system with the proposed predictor leads to a stabilizing controller for the delayed system. Furthermore, the tracking performance and the steady-state disturbance rejection capabilities of the equivalent delay-free loop are preserved. In order to place this contribution in context, some modifications of the SP are revisited and recast under the same structure. The features of the proposed scheme are illustrated through simulations, showing a comparison with respect to the corresponding delay-free loop, which is here considered to be the ideal scenario. In order to emphasize the feasibility of this approach, a successful experimental implementation in a laboratory platform is also reported. (C) 2017 ISA. Published by Elsevier Ltd. All rights reserved.

关键词： Smith Predictor Time delay External disturbances single-input single-output system

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Build-in wiretap channel I with feedback and LDPC codes by soft decision decoding

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IET COMMUNICATIONS 2017年第11期11卷 1808-1814页

作者： Zhang, Gaoyuan Wen, Hong Pu, Jiexin Tang, Jie Henan Univ Sci & Technol Sch Elect & Informat Engn Luoyang Peoples R China Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu Sichuan Peoples R China

Many approaches to build a wiretap channel (WTC) by multi-input multi-output system have been introduced. Different from those approaches, the authors propose a feedback method combined with the low-density parity-check (LDPC) codes for building the WTC I (WTC-I) to achieve unconditional security under single-input single-output system by the soft decision decoding. The novel approach establishes the WTC-I on both the binary symmetric channel and binary input additive white Gaussian noise channel. In order to keep the eavesdropper be fully ignorant about the secret information, randomness is added to the feedback signals from the destination by taking advantage of feedback. In addition, the message to be sent is encoded by the LDPC codes such that it can be correctly decoded by a legitimate receiver. Furthermore, the secret information transmission capacity can be improved by the soft decision decoding.

关键词： decoding parity check codes MIMO communication telecommunication security AWGN channels build-in wiretap channel I LDPC codes soft decision decoding multi-input multi-output system MIMO system low-density parity-check codes WTC I unconditional security single-input single-output system binary symmetric channel binary input additive white Gaussian noise channel feedback signals legitimate receiver secret information transmission capacity

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Discrete input-output Second Order Sliding Mode Control Using LMIs Approach 12

Discrete Input-Output Second Order Sliding Mode Control Usin...

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International Multi-Conference on systems, Signals and Devices (SSD)

作者： Houda, Romdhane Khadija, Dehri Said, Nouri Ahmed Univ Gabes Sch Gabes Res Unit Numer Control Ind Proc Natl Engn St Medenine Gabes 6029 Tunisia

ISBN: (纸本)9781479917587

During the reachability phase, the sliding mode control is sensitive to external disturbances and uncertainties. In this paper, we propose to determine the coefficients of the sliding function using the technique of Linear Matrix Inequalities. This technique leads to an optimal choice of sliding function. Using the proposed sliding function, a discrete second order sliding mode control is presented. The control law is based on an input-output model. Simulation results demonstrate that the proposed strategy leads to an optimal performances in terms of the reduction of the reachability phase and the chattering phenomenon.

关键词： Discrete Second Order Sliding Mode Control single-input single-output system input-output Model Linear Matrix Inequalities Reachability phase

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On feasibility of linear interference alignment for single-input-single-output multi-frequency interference channel

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IET COMMUNICATIONS 2014年第12期8卷 2207-2212页

作者： Du, Guang-long Zou, Wei-xia Zhou, Zheng Liu, Jian-han Beijing Univ Posts & Telecommun Key Lab Univ Wireless Commun MOE Beijing 100876 Peoples R China MediaTek Inc San Jose CA USA

This study explores the feasibility of linear interference alignment (IA) for a (M x M, 1)(K) system with multi-frequency independent channels. The authors prove that number of users K <= 2M - 2 is a necessary condition for (M x M, 1)(K) multi-frequency IA system, which is less than that of (M x M, 1)(K) multiple-input-multiple-output system (i.e. K <= 2M - 1). The conclusion can be extended to all cases with the diagonal channel matrix. They also reveal that the traditional frequency division multiplexing method is inefficient in spectrum utilisation. They apply max-SINR (signal to interference plus noise ratio) and iterative IA algorithms and the author's simulation results verify that IA algorithms work well in (M x M, 1)(2M-2) IA system.

关键词： radio networks radiofrequency interference matrix algebra linear interference alignment single-input single-output system multifrequency interference channel multifrequency interference alignment system diagonal channel matrix

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