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IEEE International Symposium on Information Theory

作者： Yufang Xi Edmund M. Yeh Department of Electrical Engineering Yale University New Heaven CT USA

ISBN: (纸本)142440505X

We present a unified analytical framework within which power control and routing for wireless networks can be optimized on a node-by-node basis. We consider a multicommodity flow model for an interference-limited wireless network in which power control and routing variables are chosen to minimize convex link costs. Distributed scaled gradient projection algorithms are developed to iteratively adjust power control and routing schemes at individual nodes. We specify appropriate scaling matrices with which the algorithms quickly converge to the global optimum from any initial point. These scaling matrices can be computed locally at each node with limited control message overhead

关键词： Power control Routing Wireless networks Communication system traffic control projection algorithms Iterative algorithms Interference Costs Physical layer Distributed algorithms

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Node-Based Distributed Optimal Control of Wireless Networks

Node-Based Distributed Optimal Control of Wireless Networks

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Annual Conference on Information Sciences and Systems (CISS)

作者： Yufang Xi Edmund M. Yeh Department of Electrical Engineering Yale University New Heaven CT USA

We present a unified analytical framework within which power control, routing, and congestion control for wireless networks can be optimized on a node-by-node basis. We consider a multi-commodity flow model for interference-limited wireless networks, and develop distributed scaled gradient projection algorithms which iteratively adjust power control and routing schemes at individual nodes to minimize convex link costs. We provide locally computable scaling matrices which guarantee fast convergence of the algorithms to the global optimum from any initial condition. Furthermore, we show that congestion control can be seamlessly incorporated into our framework with the introduction of virtual overflow links.

关键词： Optimal control Wireless networks Routing Power control Costs Communication system traffic control Communication system control Interference projection algorithms Convergence

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Scalable algorithms for Aggregating Disparate Forecasts of Probability

Scalable Algorithms for Aggregating Disparate Forecasts of P...

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International Conference on Information Fusion

作者： J. B. Predd S. R. Kulkarni H. V. Poor D. N. Osherson Department of Electrical Engineering Princeton University Princeton NJ USA Department of Psychology Princeton University Princeton NJ USA

ISBN: (纸本)1424409535

In this paper, computational aspects of the panel aggregation problem are addressed. Motivated primarily by applications of risk assessment, an algorithm is developed for fusing large corpora of internally incoherent probability assessments. The algorithm is characterized by a provable performance guarantee, and is demonstrated to be orders of magnitude faster than existing tools when tested on several real-world data-sets. In addition, unexpected connections between research in risk assessment and wireless sensor networks are exposed, as several key ideas are illustrated to be useful in both fields

关键词： Wireless sensor networks Risk management Signal processing algorithms Humans Sensor arrays projection algorithms Risk analysis Economic forecasting Robustness Iterative algorithms

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Lower Bounds for the MSE Convergence of APA

Lower Bounds for the MSE Convergence of APA

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Proceedings of 2006 IEEE International Symposium on Circuits and Systems,Volume 7

作者： Ifiok J. Umoh Tokunbo Ogunfunmi Department of Electrical Engineering Santa Clara University Santa Clara USA

It is well known that the Least Mean Square (LMS) algorithm convergence speed degrades considerably when the input signal is correlated. On the other hand, the Affine projection Algorithm (APA) was recently developed and has faster convergence for correlated inputs compared to LMS. Convergence Analysis done on APA to date has been based on either a modification of the independence assumption, a special regression model, or a Gaussian regression data model, In this paper, an analysis of the standard APA algorithm under the assumption of a finite strong memory and finite moments for the regression data is done. We prove that under steady state conditions, the weight error covariance is lower bounded and dependent on the step size and not the correlation of the input regression matrix.

关键词： Convergence Least squares approximation Steady-state Algorithm design and analysis projection algorithms Equations Covariance matrix Adaptive algorithm Mean square error methods Transient analysis

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Kernel Procrustes

Kernel Procrustes

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International Conference on Pattern Recognition

作者： I.M. de Diego A. Munoz University of Rey Juan Carlos Madrid Spain Universidad Carlos III de Madrid Madrid Spain

In this work we introduce a new methodology to build a kernel matrix from a collection of kernels. The key idea is to build a unique kernel that eliminates spurious differences between kernels. We propose a method based on the Procrustes problems that uses the alternating projections method to minimize a certain error measure. The resulting kernel will be used for classification purposes using support vector machines (SVMs). The proposed method has been successfully evaluated against alternative kernel combination techniques

关键词： Kernel Support vector machines Support vector machine classification Computer errors Information resources Text mining Linear programming projection algorithms Training data Pattern recognition

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Stabilization of Linear Systems with Input Amplitude and Rate Constraints

Stabilization of Linear Systems with Input Amplitude and Rat...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Xiaodong Zhao Jialian Wang Anke Xue Institute of Intelligent Information and Control Technology Hangzhou Dianzi University Zhejiang China

For discrete-time linear systems with inputs amplitude and rate constraints, we show that there exists a finite horizon such that the infinite horizon constrained LQR problem can turn to a finite horizon constrained LQR problem and give an upper bound of this horizon for any given initial state. We also give an upper bound of this finite horizon for all initial states inside the stability region, finally, we give a mixed controller which stabilizes the system

关键词： Linear systems Control systems Upper bound Stability Time factors Intelligent control Infinite horizon Application software projection algorithms Predictive models

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Adaptive Parameter Estimation-Based Predictive Multi-Model Switching Control of Drainage Systems

Adaptive Parameter Estimation-Based Predictive Multi-Model S...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Zhongjie He Xionghai Wang Department of Electrical Engineering University of Zhejiang Hangzhou Zhejiang China

A discrete-time model with delay was derived, aiming at the sewage overflow and operational cost caused by unexpected time variation and delay in flows of drainage system. Based on the model, an adaptive multi-model switching control strategy using predictive functional control (PFQ is developed. The strategy can estimate the flow to the pumping station and predict the depth of pump well. Combining on-line identification using improved projection algorithm with multi-model switching abates model mismatch and system chattering under the influence of switching over frequently. Initial value matching up to each sub-model was employed to accelerate convergence of estimates, which was identified by off-line estimation. Simulation results indicate that the proposed control approach is robust and effective. The discharge of the downstream pumps is varied automatically by tracking the outflow mainly from upstream pumping stations that the predetermined water level of pump well is maintained by the adoption of this control strategy, which minimizes the overflow pollution

关键词： Programmable control Adaptive control Parameter estimation Control systems Delay effects Automatic control Costs Predictive models projection algorithms Acceleration

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Efficient computation of the Hausdorff distance between polytopes by exterior random covering

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COMPUTATIONAL OPTIMIZATION AND APPLICATIONS 2005年第2期30卷 161-194页

作者： Llanas, B Univ Politecn Madrid Dept Matemat Aplicada ETSI Caminos E-28040 Madrid Spain

In this paper, a simple yet efficient randomized algorithm (Exterior Random Covering) for finding the maximum distance from a point set to an arbitrary compact set in R-d is presented. This algorithm can be used for a... 详细信息

关键词： Hausdorff distance maximum distance polytopes polyhedra projection algorithms Lipschitz random covering

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Modified Gauss-Seidel affine projection algorithm for acoustic echo cancellation

Modified Gauss-Seidel affine projection algorithm for acoust...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： F. Albu C. Kotropoulos Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

The paper proposes a robust and stable fast affine projection algorithm based on the Gauss-Seidel method, the so called modified Gauss-Seidel fast affine projection algorithm. The proposed algorithm is generalized for simplified Volterra filters as well. The computational complexity of both the modified Gauss-Seidel fast affine projection algorithm and its generalization for simplified Volterra filters is derived and their performance for acoustic echo cancellation is assessed.

关键词： Gaussian processes projection algorithms Echo cancellers Financial advantage program Nonlinear filters Convergence Robustness Computational complexity Resonance light scattering Informatics

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Modified cross-correlation back projection for UWB imaging: numerical examples

Modified cross-correlation back projection for UWB imaging: ...

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IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： R. Zetik J. Sachs R. Thoma Ilmenau University of Technology Germany

The article presents a modification of cross-correlated back projection algorithm for UWB imaging. The modified algorithm has improved performance in a sense of better quality of reconstructed 2D or 3D images of the p... 详细信息

关键词： Optical imaging Back Electromagnetic scattering projection algorithms Data acquisition Ultrasonic imaging Inverse problems Microwave imaging Electromagnetic measurements Image reconstruction

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