Entity

Time filter

Source Type


Chu H.,Nantong University | Mao R.,North Information Control Group Co. | Chen J.-X.,Nantong University
Applied Computational Electromagnetics Society Journal | Year: 2015

Diplexers based on dual-mode Substrate Integrated Waveguide (SIW) cavities are proposed and implemented. The dual-mode cavities not only act as a resonator for both Rx and Tx channels, but also as the interconnect between these two channels which help to realize the isolation. The dual-mode cavities resonating at TE201 and TE103 modes in our design show several advantages than those dual-mode cavities operating at TE201 and TE301 modes. Single-mode cavities are cascaded with the dual-mode cavity to realize the two-order filters for Rx and Tx channels. Two design examples are presented with a normal printed circuit board process and verified by experiments.


Zhang J.,Nanjing University of Science and Technology | Lyu M.,North Information Control Group Co. | Karimi H.R.,University of Agder | Guo P.,Nanjing University of Science and Technology | Bo Y.,Nanjing University of Science and Technology
The Scientific World Journal | Year: 2014

The robust H∞ filtering problem is investigated for a class of complex network systems which has stochastic packet dropouts and time delays, combined with disturbance inputs. The packet dropout phenomenon occurs in a random way and the occurrence probability for each measurement output node is governed by an individual random variable. Besides, the time delay phenomenon is assumed to occur in a nonlinear vector-valued function. We aim to design a filter such that the estimation error converges to zero exponentially in the mean square, while the disturbance rejection attenuation is constrained to a given level by means of the H∞ performance index. By constructing the proper Lyapunov-Krasovskii functional, we acquire sufficient conditions to guarantee the stability of the state detection observer for the discrete systems, and the observer gain is also derived by solving linear matrix inequalities. Finally, an illustrative example is provided to show the usefulness and effectiveness of the proposed design method. © 2014 Jie Zhang et al.


Li Y.,Beijing University of Technology | Zheng Z.,North Information Control Group Co. | Zhao M.,Shunde High School | Jin S.,University of Electronic Science and Technology of China | Huang Z.,Beijing University of Technology
Mathematical Problems in Engineering | Year: 2013

Energy efficiency (EE) capacity analysis of the chunk-based resource allocation is presented by considering the minimum spectrum efficiency (SE) constraint in downlink multiuser orthogonal frequency division multiplexing (OFDM) systems. Considering the minimum SE requirement, an optimization problem to maximize EE with limited transmit power is formulated over frequency selective channels. Based on this model, a low-complexity energy efficient resource allocation is proposed. The effects of system parameters, such as the average channel gain-to-noise ratio (CNR) and the number of subcarriers per chunk, are evaluated. Numerical results demonstrate the effectiveness of the proposed scheme for balancing the EE and SE. © 2013 Yong Li et al.


Zhang J.,Nanjing University of Science and Technology | Karimi H.R.,University of Agder | Zheng Z.,Harbin Institute of Technology | Lyu M.,North Information Control Group Co. | Bo Y.,Nanjing University of Science and Technology
Mathematical Problems in Engineering | Year: 2013

We deal with the design problem of minimum entropy H∞ filter in terms of linear matrix inequality (LMI) approach for linear continuous-time systems with a state-space model subject to parameter uncertainty that belongs to a given convex bounded polyhedral domain. Given a stable uncertain linear system, our attention is focused on the design of full-order and reduced-order robust minimum entropy H∞ filters, which guarantee the filtering error system to be asymptotically stable and are required to minimize the filtering error system entropy (at s 0 = ∞) and to satisfy a prescribed H∞ disturbance attenuation performance. Sufficient conditions for the existence of desired full-order and reduced-order filters are established in terms of LMIs, respectively, and the corresponding filter synthesis is cast into a convex optimization problem which can be efficiently handled by using standard numerical software. Finally, an illustrative example is provided to show the usefulness and effectiveness of the proposed design method. © 2013 Jie Zhang et al.


Guo P.,Nanjing University of Science and Technology | Zhang J.,Nanjing University of Science and Technology | Lyu M.,North Information Control Group Co. | Bo Y.,Nanjing University of Science and Technology
Mathematical Problems in Engineering | Year: 2013

This paper considers the sliding mode control of multiagent systems (MAS) with time-delay and uncertainties in terms of linear matrix inequality (LMI). By constructing virtual feedback control method, the design of control system is simplified for time-delay independent system without uncertainties. For a class of uncertain systems with single time-delay, the essence of SMC design is analyzed in order to acquire a simple method for designing sliding surface. In terms of multiple timedelay system with uncertainties, a sufficient condition for sliding surface with independent time-delay is acquired, while control law is also designed to ensure the robust stability of closed-loop system. Finally, the effectiveness of conclusion is demonstrated by simulation results. © 2013 Pengfei Guo et al.

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