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analysis, design, AND IMPLEMENTATION OF AN AC BRIDGE FOR IMPEDANCE MEASUREMENTS

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1994年第6期43卷 894-899页

作者： AWAD, SS NARASIMHAMURTHI, N WARD, WH FORD MOTOR CO DEARBORNMI 48126

The paper reviews the digital AC bridge. A more accurate and thorough analysis of the bridge is presented. Based on the analysis a simple adaptive algorithm is proposed in order to ensure fast conversion. In addition, a new design of the bridge, based on the TMS 320C25, is given. The system is implemented with the Dalanco Spry model 25 DSP board, on a software system designed whereby an IBM PC host computer provides control of the bridge. Experimental results are presented.

关键词： Impedance measurement Bridge circuits Adaptive algorithm Voltage Digital signal processing Microprocessors Convergence Signal design Frequency algorithm design and analysis

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design AND analysis OF SEGMENTED ROUTING CHANNELS FOR ROW-BASED FPGAS

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IEEE TRANSACTIONS ON COMPUTER-AIDED design OF INTEGRATED CIRCUITS AND SYSTEMS 1994年第12期13卷 1470-1479页

作者： PEDRAM, M NOBANDEGANI, BS PREAS, BT XEROX CORP PALO ALTO RES CTRCOMP SCI LABPALO ALTOCA 94304

FPGA's combine the logic integration benefits of custom VLSI with the design, production, and time-to-market advantages of standard logic IC's. The Actel family of FPGA's exemplifies the row-based FPGA model. Rows of logic cells interspersed with routing channels have given this family of FPGA devices the flavor of traditional channeled gate arrays or standard cells. However, unlike the conventional standard cell design, the FPGA routing channels contain predefined wiring segments of various lengths that are interconnected using antifuses. This paper develops analytical models that permit the design of FPGA channel architecture and the analysis of the routability of row-based FPGA devices based on a generic characterization of the row-based FPGA routing algorithms. In particular, it demonstrates that using probabilistic models for the origination point and length of connections, an FPGA with properly designed segment length and distribution can be nearly as efficient as a mask-programmable channel (in terms of the number of required tracks). Experimental results corroborate this prediction. This paper does not address specifics of the routing algorithms, but investigates the design of the channel segmentation architecture (i.e, various lengths and patterns of segments and connections among these segments) in order to increase the probability of successful routing.

关键词： Routing Field programmable gate arrays Logic devices algorithm design and analysis Logic design Logic arrays Very large scale integration Production Time to market Wiring

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design AND PERFORMANCE analysis OF THE algorithmS FOR CHANNEL ALLOCATION IN CELLULAR NETWORKS

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 1993年第4期42卷 526-534页

作者： DIMITRIJEVIC, DD VUCETIC, J GTE Laboratories Inc. Waltham MA USA

In this paper, we consider the problem of dynamic channel allocation in cellular networks. Each cell can use any channel, subject to the interference constraints. Channel allocation algorithms are executed by the network switch in a centralized way. We show how to design and use objective functions aimed at proper channel allocation and improvement of network performance. As a figure of merit of network performance, we consider the blocking probability in the network as a whole, and the maximum blocking probability in any particular cell of the network (''hot-spot'' in the network). We designed three specific channel allocation policies, based on three different objective functions. Compared with two other benchmark policies, our approach shows significant improvement. Performance analysis of various channel allocation policies is virtually impossible without simulations, which are prohibitively time-consuming in the case of small blocking probabilities. We propose an original approximate method based on a short simulation and an analytic approximation. The method exhibits good accuracy and significant improvement in efficiency.

关键词： algorithm design and analysis Performance analysis Channel allocation Intelligent networks Land mobile radio cellular systems Heuristic algorithms Switches Interference constraints Analytical models Network topology

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design and analysis of Backoff algorithms for Random Access Channels in UMTS-LTE and IEEE 802.16 Systems

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2011年第8期60卷 3975-3989页

作者： Seo, Jun-Bae Leung, Victor C. M. Univ British Columbia Dept Elect & Comp Engn Vancouver BC V6T 1Z4 Canada

In this paper, we examine the performance of uniform backoff (UB) and binary exponential backoff (BEB) algorithms with retry limit, which can be used in the random-access channels of Universal Mobile Telecommunication System (UMTS)-Long Term Evolution (LTE) and IEEE 802.16 systems under the assumption of finite population under unsaturated traffic conditions. Additionally, we consider access prioritization schemes to provide differential performance by controlling various system parameters. We show that controlling the persistence value as specified in UMTS is effective in both backoff algorithms. The performances with and without access prioritization schemes are presented in terms of throughput, mean, and variance of packet retransmission delay, packet-dropping probability, and system stability. Finally, we consider a dynamic window assignment algorithm that is based on Bayesian broadcasting, in which the base station adaptively controls the window size of the UB algorithm under unsaturated traffic conditions. Results show that the proposed window assignment algorithm outperforms fixed window assignment in static and dynamic traffic conditions under the assumption of perfect orthogonality between random-access codes.

关键词： Access protocol algorithm design and analysis cellular networks communication system signaling multiaccess communication

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ON THE design OF FIR analysis-SYNTHESIS FILTER BANKS WITH HIGH COMPUTATIONAL-EFFICIENCY

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 1994年第4期42卷 825-834页

作者： NAYEBI, K BARNWELL, TP SMITH, MJT Digital Signal Processing Laboratory School of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

This paper presents an effective design algorithm for analysis-synthesis filter banks with computationally efficient structures. Although a wide variety of implementation structures can be accommodated, the focus of this paper is on cosine modulated filter banks. The design procedure is based on a time domain formulation of analysis-synthesis filter banks in which each individual channel filter is constrained to be a cosine modulated versions of a baseband filter. The resulting filter banks are very efficient in terms of computational requirements and are relatively easy to design. A unique feature of this approach is that relatively low reconstruction delays can be imposed on the system. A discussion of the associated computational properties of the designed systems and some design examples are included.

关键词： Finite impulse response filter Channel bank filters Computational efficiency Filter bank Image reconstruction Baseband Computational complexity algorithm design and analysis Speech analysis Speech synthesis

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STATISTICAL design OF analysis SYNTHESIS SYSTEMS WITH QUANTIZATION

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IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING 1988年第3期36卷 328-341页

作者： DEMBO, A MALAH, D TECHNION ISRAEL INST TECHNOL DEPT ELECT ENGNIL-32000 HAIFAISRAEL

A statistical model is used for the optimal design of analysis/synthesis systems that include quantization of the signals in separate bands. Two types of quantization approaches are analyzed: fine quantization modelled by additive noise, and matrix quantization. With proper modification, the model applies to other types of quantization approaches. Assuming that the system operates as a waveform coder, two error measures are used: a generalization of the usual statistical mean-square error (MSE) to time-varying systems, and the MSE between the outputs of the analysis of the original and reconstructed signals. The measures are shown to be equivalent. A method that is applicable to the design of optimal synthesis filters, given the analysis filters, is presented. For fine quantization, an iterative algorithm for the design of an optimal analysis/synthesis system is presented, together with its convergence properties. If no quantization is applied, the results obtained with the presented method coincide with previously reported results.< >

关键词： Quantization Signal synthesis Signal analysis Filters algorithm design and analysis Signal design Additive noise Time varying systems Iterative algorithms Convergence

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analysis, design, and Estimation of Linear Equality-Constrained Dynamic Systems

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IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2015年第4期51卷 2732-2746页

作者： Duan, Zhansheng Li, X. Rong Xi An Jiao Tong Univ Coll Elect & Informat Engn Ctr Informat Engn Sci Res Xian 710049 Shaanxi Peoples R China Univ New Orleans Dept Elect Engn New Orleans LA 70148 USA

The state of many dynamic systems evolves subject to some equality constraints. Most existing work focuses on developing state estimation algorithms for an equality-constrained dynamic system assuming the system is given. How to design and analyze such a system is rarely addressed, even though it is critically important for application and performance evaluation. In this paper, we first analyze the underlying structural information of linear equality-constrained (LEC) dynamic systems through direct elimination. It is found that the process noise of such a system is state dependent in general. This means that existing formulations of such a system are quite limited. Based on the analysis, we then propose a new systematic way to design LEC systems. The key idea is to design only the unconstrained part of the system. Unlike existing system conversion-based design techniques, in our work the desired model class is given and only the distributions of the initial state and process noise need to be determined, which is comparatively easier. To handle state dependency of the process noise, a new constrained state estimation algorithm based on direct elimination is also proposed. Three examples are provided to illustrate the effectiveness of the proposed methods of analysis, design, and estimation, respectively.

关键词： Aerodynamics algorithm design and analysis Covariance matrices Heuristic algorithms State estimation Vehicle dynamics

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CONVERGENCE analysis AND design OF AN ADAPTIVE FILTER WITH FINITE-BIT POWER-OF-2 QUANTIZED ERROR

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING 1992年第2期39卷 113-115页

作者： EWEDA, E Military Technical College Cairo Egypt

This paper is concerned with the analysis and design of an adaptive filter governed by an LMS algorithm with finite-bit power-of-two quantization of the error signal. Both the input data and the optimal filter weights are assumed stationary. An expression of the steady-state error power is derived. According to this expression, the error power is linearly increasing in the step size-mu and exponentially decreasing in the number of quantizer bits B. A practically interesting result is the derivation of a threshold value of B above which the error power is constant versus B. The threshold is a decreasing function of the noise power. Expressions of B and mu that achieve a given tolerable value of the error power with the fastest convergence and the minimum hardware complexity are provided.

关键词： Convergence Adaptive filters Signal processing algorithms algorithm design and analysis Quantization Least squares approximation Equations Hardware Filtering algorithms Gaussian noise

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A CONTINUUM APPROACH IN SHAPE design SENSITIVITY analysis OF MAGNETOSTATIC PROBLEMS USING THE BOUNDARY ELEMENT METHOD

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IEEE TRANSACTIONS ON MAGNETICS 1993年第2期29卷 1771-1774页

作者： KOH, CS HAHN, SY JUNG, HK CHOI, K KANGWEON NATL UNIV DEPT ELECTR ENGN CHUNCHON 200701 SOUTH KOREA KANGWEON NATL UNIV DEPT ELECTR ENGN CHUNCHON 200701 SOUTH KOREA

A new shape design sensitivity formula for magnetostatic problems is derived analytically employing the material derivative concept in continuum mechanics. In order to express the design sensitivity as a function of shape variation only, the adjoint variable is defined. Since the formula is expressed as boundary integration of state and adjoint variables over deformed boundary, the boundary element method is employed to evaluate the variables accurately on the boundary. The proposed algorithm is applied to the pole-shape optimization of a quadrupole magnet through which the validity is proved.

关键词： Shape Sensitivity analysis Magnetostatics Equations Magnetic materials Boundary element methods design optimization Magnetic analysis Electromagnetic devices algorithm design and analysis

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design SENSITIVITY analysis FOR SHAPE OPTIMIZATION OF 3-D ELECTROMAGNETIC DEVICES

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IEEE TRANSACTIONS ON MAGNETICS 1993年第2期29卷 1753-1757页

作者： KOH, CS HAHN, SY LEE, KS CHOI, K DANKOOK UNIV DEPT ELECTR ENGNSEOUL 140714SOUTH KOREA KANGWEON NATL UNIV DEPT ELECTR ENGNCHUNCHONSOUTH KOREA

A three-dimensional shape optimization algorithm is developed by combining the design sensitivity analysis and the boundary element method. For the design sensitivity analysis, the implicit differentiation is taken to the boundary integral equation with respect to the design variable. The proposed algorithm is validated by applying it to the pole shape optimization of the three-dimensional electromagnets.

关键词： Sensitivity analysis Shape design optimization Electromagnetic devices Magnetostatics Boundary element methods Integral equations Magnetic materials algorithm design and analysis Jacobian matrices

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