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Performance analysis and SINR-based power allocation strategies for downlink NOMA networks

IET COMMUNICATIONS 2020年第5期14卷 723-735页

作者： Baidas, Mohammed W. Alsusa, Emad Hamdi, Khairi A. Kuwait Univ Coll Engn & Petr Dept Elect Engn Kuwait Kuwait Univ Manchester Sch Elect & Elect Engn Manchester Lancs England

This study analyses the performance of downlink non-orthogonal multiple-access (NOMA) networks over independent but not necessarily identically distributed Rayleigh fading channels by deriving closed-form expressions for the average signal-to-interference-plus-noise ratio (SINR), average achievable rate, and outage probability of all network users. Moreover, SINR-based power allocation strategies are studied. Specifically, the optimisation problems of max-min SINR, multi-objective SINR, sum-SINR and proportional-fairness-SINR maximisation under minimum SINR constraints are formulated and shown to be non-convex. Additionally, the problems of total power and sum-SINR minimisation are also formulated. Particularly, the formulated problems take the form of linear-fractional programming problems. By applying intelligent reformulation techniques, these problems have been reformulated into convex optimisation problems, and thus efficiently solved. Numerical evaluations are presented to validate the derived closed-form expressions for the different performance metrics, which are found to be in agreement with the network simulation results. More importantly, it has been demonstrated that the user with the best channel conditions achieves full diversity order, whereas all the other users achieve diversity orders equivalent to their ordered channel conditions. Finally, the reformulated power allocation strategies are evaluated, and shown to coincide with the original problem formulations.

关键词： probability Rayleigh channels radiofrequency interference convex programming multi-access systems concave programming minimisation linear programming numerical analysis SINR-based power allocation strategies proportional-fairness-SINR maximisation minimum SINR constraints sum-SINR minimisation linear-fractional programming problems convex optimisation problems closed-form expressions reformulated power allocation strategies downlink NOMA networks downlink nonorthogonal multiple-access networks identically distributed Rayleigh fading channels signal-to-interference-plus-noise ratio outage probability intelligent reformulation techniques numerical evaluations

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Dynamic output feedback controller design for interval type-2 T-S fuzzy fractional order systems

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IET CONTROL THEORY AND APPLICATIONS 2020年第18期14卷 2857-2867页

作者： Zhang, Xuefeng Jin, Kaijing Northeastern Univ Sch Sci Shenyang 110819 Liaoning Peoples R China

This study discusses the issue of the stabilisation of interval type-2 Takagi-Sugeno (T-S) fuzzy fractional order systems by designing the dynamic output feedback controller. In the system model, the system matrix has no assuming limitations. Different membership functions are attached to the T-S fuzzy model and fuzzy controller. For fractional order of 0 < alpha < 1 case, sufficient conditions in terms of strict linear matrix inequalities are addressed. Then, for 1 < alpha < 2 order case, by some contragradient transformations, sufficient stability conditions in terms of convex optimisation problems are derived. All of the proposed theorems are strict linear matrix inequalities and can be solved in standard software. Finally, two numerical simulation examples are given to illustrate the effectiveness of the proposed method.

关键词： fuzzy set theory feedback control system synthesis fuzzy systems Lyapunov methods fuzzy control linear matrix inequalities stability convex programming dynamic output feedback controller design interval type-2 Takagi-Sugeno fuzzy fractional order systems system matrix membership functions fuzzy controller strict linear matrix inequalities sufficient stability conditions contragradient transformations convex optimisation problems

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optimisation of indoor hybrid PLC/VLC/RF communication systems

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IET COMMUNICATIONS 2020年第1期14卷 117-126页

作者： Sreenivasa Reddy, Yeduri Panda, Meenakshi Dubey, Ankit Kumar, Abhinav Panigrahi, Trilochan Rabie, Khaled M. NIT Goa Dept Elect & Commun Engn Ponda 403401 India IIT Jammu Dept Elect Engn Jammu 181221 India IIT Hyderabad Dept Elect Engn Hyderabad 502285 Telangana India Manchester Metropolitan Univ Sch Engn Manchester M15 6BH Lancs England

In this study, the authors propose a hybrid power line communication (PLC)/visible light communication (VLC)/radio frequency (RF) fronthaul with a fibre-based wired backhaul system to support massive number of smart devices (SDs). Since a signal-to-noise ratio-based access point (AP) association and bandwidth (BW) allocation for each SD do not necessarily improve the system capacity, they propose novel and efficient AP association and BW allocation strategies to maximise the sum rate capacity (SRC) of the hybrid system under consideration. An optimisation problem is formulated for the SRC with the AP association and BW allocation as the optimisation parameters and a hierarchical decomposition method is used to convert the non-linear optimisation problem into a set of convex optimisation problems. Then, the proposed strategies are used to solve the optimisation problem in an iterative manner until the SRC converges to an optimal value. Further, an analytical approximation for the BW allocated to each SD for a given AP association is derived using the Lagrangian multiplier method. The performance of the proposed system is evaluated through extensive numerical results. Moreover, the effect of the increased number of SDs on the optimal SRC is analysed.

关键词： carrier transmission on power lines convex programming iterative methods approximation theory free-space optical communication bandwidth allocation indoor communication nonlinear programming AP association fibre-based wired backhaul system system capacity optimisation parameters nonlinear optimisation problem convex optimisation problems indoor hybrid PLC-VLC-RF communication system optimization hybrid power line communication visible light communication radio frequency fronthaul signal-to-noise ratio-based access point association smart devices bandwidth allocation BW allocation strategies sum rate capacity maximization hierarchical decomposition method analytical approximation Lagrangian multiplier method optimal SRC

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Robust observer-based finite-time H∞ control for one-sided Lipschitz singular systems with uncertainties

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IET CONTROL THEORY AND APPLICATIONS 2020年第16期14卷 2319-2328页

作者： Ren, Junchao Li, Fangfang Fu, Jun Northeastern Univ Coll Sci Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang 110819 Peoples R China

This study deals with the problem of observer-based finite-time H-infinity control for a class of one-sided Lipschitz (OSL) singular systems with uncertainties. The parameter uncertainties are assumed to be time-varying norm-bounded appearing not only in both the state and output matrices but also in the non-linear function. With the help of some special derivations and transformation, the sufficient conditions ensuring robust finite-time boundedness of the closed-loop system and satisfying the H-infinity performance index are given for OSL singular systems in terms of linear matrix inequalities (LMIs). Based on these, the observer and controller dynamics can be simultaneously involved in the design at one step. Two convex optimisation problems subject to LMIs are formulated to optimise the desired performance indices of interest to us. Finally, two examples are given to demonstrate the effectiveness of the proposed methods.

关键词： closed loop systems robust control observers linear matrix inequalities uncertain systems nonlinear functions convex programming linear matrix inequalities controller dynamics convex optimisation problems one-sided Lipschitz singular systems parameter uncertainties time-varying norm-bounded uncertainties output matrices nonlinear function robust finite-time boundedness closed-loop system OSL singular systems robust observer-based finite-time H-infinity control

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