The current letter extends narrow band (NB) local polynomial approximation (LPA) beamforming to wide band (WB) rapidly moving sources. Instead of the conventional beamformer weight in NB LPA, the proposed method adopt...
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The current letter extends narrow band (NB) local polynomial approximation (LPA) beamforming to wide band (WB) rapidly moving sources. Instead of the conventional beamformer weight in NB LPA, the proposed method adopts the steered minimum variance (STMV) method that can achieve a high resolution with short time observations. The performance of the proposed algorithm is demonstrated via computer simulations.
In this paper we present a comparative study of two adaptive algorithms applied to the impulse response estimation of the newly proposed space-time geometrical-based hyperbolic distributed scatterers (GBHDS) channel m...
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In this paper we present a comparative study of two adaptive algorithms applied to the impulse response estimation of the newly proposed space-time geometrical-based hyperbolic distributed scatterers (GBHDS) channel model. The two adaptive algorithms which form the basis of this study are the decision-directed recursive least square (RLS) and the decision-directed least mean square (LMS) algorithms. In this estimation task, the performance of the decision-directed RLS algorithm is found to be better than that of the decision-directed LMS algorithm.
Power electron.cs circuits are rich in nonlinear dynamics. Their operation is characterized by cyclic switching of circuit topologies, which gives rise to a variety of nonlinear behaviours. Over the past two decades, ...
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Power electron.cs circuits are rich in nonlinear dynamics. Their operation is characterized by cyclic switching of circuit topologies, which gives rise to a variety of nonlinear behaviours. Over the past two decades, a lot of research activities have focused on identifying bifurcations and chaos, and explaining them using the theory of nonlinear dynamics. As power electron.cs engineers gain more knowledge and deeper understanding of nonlinear dynamics in power electron.cs, they begin to look for possible applications. As a result, research of applications of nonlinear dynamics in power electron.cs has become a hot topic. Recently, some applications of nonlinear dynamics in power electron.cs systems and related theory have been identified. This paper tries to provide an overview of these successful applications.
A dynamic voltage restorer is a power quality device used to correct the voltage disturbances by injecting voltage as well as power into the system. A method of determining the exact amount of voltage injection requir...
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A dynamic voltage restorer is a power quality device used to correct the voltage disturbances by injecting voltage as well as power into the system. A method of determining the exact amount of voltage injection required to systematically correct a specific voltage drop with minimum active power injection is described in this letter. Analytical expressions for both the magnitude and angle of the injected voltage are also derived. It has been found that a voltage drop of less than (1 - pf) pu can easily be corrected without injecting any active power. For higher voltage drop, injection of active power is essential but its value can be minimized by drawing power from the supply at unity power factor.
This paper presents a comparative evaluation of Proportional - Integral and Fuzzy Logic Controller to a Constant Frequency Zero Voltage Switching Quasi Resonant Buck-Boost converter. Sensitivity of these controllers t...
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ISBN:
(纸本)0780382439
This paper presents a comparative evaluation of Proportional - Integral and Fuzzy Logic Controller to a Constant Frequency Zero Voltage Switching Quasi Resonant Buck-Boost converter. Sensitivity of these controllers to load disturbances are studied and results are presented. The simulation study indicates, the superiority of fuzzy control over the conventional control methods. Fuzzy logic seems to have a lot of promise in the application of power electron.cs.
This paper presents an efficient, simple and new method for solving Economic Dispatch (ED) problem with line flow constraints through the application of Evolutionary Programming (EP). The controllable system quantitie...
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This paper presents an efficient, simple and new method for solving Economic Dispatch (ED) problem with line flow constraints through the application of Evolutionary Programming (EP). The controllable system quantities in the base-case stale are optimized to minimize some defined objective function subject to the base-case operating constraints. A 10-bus system is taken for investigation. The ED results obtained using EP are compared with those obtained using quadratic programming. The investigations reveal that the proposed algorithm is relatively simple, reliable, efficient and suitable for on-line applications.
Concordat is a new sch.me that is being introduced at many UK universities and which is designed to foster the personal and professional development of contract research staff. Experience of Concordat at the Universit...
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Concordat is a new sch.me that is being introduced at many UK universities and which is designed to foster the personal and professional development of contract research staff. Experience of Concordat at the University of Leeds indicates that such staff gain added-value skills which should enhance their career prospects.
The increasing use of microwave frequencies and gigabit per second transmission rates in optical-fibre systems and the corresponding interest in using optical techniques for microwave systems are spurring the developm...
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The increasing use of microwave frequencies and gigabit per second transmission rates in optical-fibre systems and the corresponding interest in using optical techniques for microwave systems are spurring the development of microwave photonic circuits. Despite a considerable investment in research and development, monolithic photonic and optoelectron.c integrated circuits have not entered into widespread production. The paper illustrates that for the majority of microwave photonic applications, the multichip module approach is better suited in terms not only of performance but also of economy and of ease of manufacture. The advantages of silicon optical bench for optoelectron.c integration are discussed in depth. It is then shown how, with suitable modifications, silicon-based multichip modules can also provide interconnections to microwave devices, thus creating microwave photonic multichip modules.
In this paper, a new algorithm, fine granularity successive elimination (FGSE), is proposed for fast optimal block matching in motion estimation. The FGSE is featured by providing a sequence of fine grained boundary l...
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In this paper, a new algorithm, fine granularity successive elimination (FGSE), is proposed for fast optimal block matching in motion estimation. The FGSE is featured by providing a sequence of fine grained boundary levels in an aim to reject a checking candidate as early as possible, thus reducing computational load as much as possible. It is shown that the multilevel successive elimination algorithm (MSEA) is just a degraded case of FGSE with much coarser boundary levels. Comparative experiments are presented to verify the substantial speed-up gain of the proposed algorithm over the MSEA.
We propose a 16-bit Booth Leapfrog array multiplier with low voltage (1.1V), low power dissipation (10.8μW/MHz) and relatively high-speed (64ns) operation. We achieve these attributes in two ways. First, we employ ou...
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We propose a 16-bit Booth Leapfrog array multiplier with low voltage (1.1V), low power dissipation (10.8μW/MHz) and relatively high-speed (64ns) operation. We achieve these attributes in two ways. First, we employ our proposed low hardware complexity Dynamic Adders (DAs) where their Sum and Carry outputs are obtained at different rates and the DAs are used to reduce the spurious switching in the multiplier. Second, we place most of these DAs in a Leapfrog array structure (in the first stage adder array) and employ a high-speed Manchester Carry Look-Ahead (CLA) adder as the Carry Propagation Adder (CPA). The proposed multiplier features the lowest power dissipation, one of the shortest delays, resulting in the lowest Power-Delay-Product (PDP) when compared to reported designs. The proposed multiplier is suitable for power- and IC area-critical applications such as a hearing instrument.
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