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adaptive multichannel filtering

Adaptive multichannel filtering

引用

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

作者： C. Chang Cities Service Company Tulsa Oklahoma

A linearly constrained adaptive multichannel filtering algorithm is described which is designed to adjust the filter coefficients, sample by sample, within the prescribed constraints for adaptive noise cancelling purposes. This technique is applicable to many array processing problems where in the signal is corrupted by coherent as well as random noise. By minimizing the ℓ 1 norm of the filter output with time-varying convergence functions containing a version of automatic gain control and a stochastic approximation-like sequence of constants, the algorithm is shown capable of suppressing coherent noises while leaving the signal relatively unchanged.

关键词： adaptive filters Filtering algorithms Convergence Nonlinear filters Power filters Power generation adaptive algorithm Noise cancellation Gain control Programmable control

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Contributions to the analysis and design of an ADPLL

Contributions to the analysis and design of an ADPLL

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Cyril Joubert Jean Francois Bercher Genevieve Baudoin Thierry Divel Pierre Baudin ESIEE ESYCOM France ST-MICROELECTRONICS Grenoble France

In this paper, we propose two contributions to the simulation and design of an All-Digital Phase-Locked Loop (ADPLL) for RF applications. First, we extend the behavioral model we already proposed, in order to include detailed fractional aspects. Second, we propose a new adaptive algorithm that can be integrated in this ADPLL in order to lower its hardware complexity, and argue on a recently proposed algorithm for DCO gain estimation. These points are illustrated through simulations.

关键词： Clocks Oscillators Phase locked loops Radio frequency adaptive algorithm Delay effects Error correction Propagation delay Frequency synthesizers Phase noise

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Realtime online adaptive gesture recognition

Realtime online adaptive gesture recognition

引用

International Conference on Pattern Recognition

作者： A.D. Wilson A.F. Bobick Vision and Modeling Group MIT Media Laboratory Cambridge MA USA College of Computing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769507506

We introduce an online adaptive algorithm for learning gesture models. By learning gesture models in an online fashion, the gesture recognition process is made more robust, and the need to train on a large training ensemble is obviated. Hidden Markov models are used to represent the spatial and temporal structure of the gesture. The usual output probability distributions-typically representing appearance-are trained at runtime exploiting the temporal structure (Markov model) that is either trained off-line or is explicitly hand-coded. In the early stages of runtime adaptation, contextural information derived from the application is used to bias the expectation as to which Markov state the system is in at any given time. We describe the Watch and Learn system, a computer vision system which is able to learn simple gestures online for interactive control.

关键词： Hidden Markov models Runtime Computer vision Testing Laboratories adaptive algorithm Probability distribution Watches Cameras Skin

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Detection Of QRS-Wave In Electrocardiogram: Based On Kalman And Wavelets

Detection Of QRS-Wave In Electrocardiogram: Based On Kalman ...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Yu chen Zhuangzhi Yan Weixin He School of Comm and Inform Engineering Shanghai University Shanghai China School of Elec and Inform Engineering Jiangsu University Jiangsu China

An algorithm using wavelets and Kalman filtering method has been developed for QRS detection. The algorithm takes following steps: i) We use a RLS adaptive algorithm to establish a model of the electrocardiogram. Thus the algorithm can change its own model according to the change of the electrocardiogram, ii) Based on the model established in stage i), we combined the wavelet and Kalman algorithm, decomposed the signal to several scales, filtering the signal in each scale. And then, iii) A decision rule is used to determine the QRS complex. The method was tested on ECG data form the MIT database, and experimental results show that the method is effective, and the influence of the noise can be eliminated

关键词： Kalman filters Electrocardiography Change detection algorithms Filtering algorithms Resonance light scattering Wavelet transforms adaptive algorithm Working environment noise Cardiac disease Time series analysis

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adaptive control of a class of nonlinear discrete time systems application to a heat exchanger

Adaptive control of a class of nonlinear discrete time syste...

引用

IEEE Conference on Decision and Control

作者： I. D. Landau D. Normand-Cyrot A. Montano U.A. C.N.R.S. 228 E.N.S.I.E.G.-I.N.P.G Laboratoire d''Automatique de Grenoble Saint Martin d'Heres France Laboratoire des Signaux et Systèmes Gif-sur-Yvette France

A class of non linear discrete time systems which has a continuous-time counterpart and the capability of describing plants having a dynamics which depend upon the operating point is considered. For this class of non linear discrete time systems, which can be expressed in input-output form, linearizing output feedback control strategies have been developped. adaptive algorithms allowing to directly estimate the controller parameters are proposed. This approach is applied to the adaptive control of a heat exchanger nonlinear model.

关键词： adaptive control Discrete time systems Control systems Parameter estimation Output feedback Linear feedback control systems adaptive algorithm Open loop systems Delay systems adaptive systems

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WLC25-6: Greedy-Coordinated Scheduling with Resource-Sharing Constraints in Wireless Networks

WLC25-6: Greedy-Coordinated Scheduling with Resource-Sharing...

引用

IEEE Globecom 2006

作者： Hangyu Cho Jeffrey G. Andrews Wireless Networking and Communications Group Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

In wireless networks where all users have different channel characteristics and service classes, it is challenging to design an adaptive scheduler to support quality of service (QoS). Some fraction of multiuser diversity gain, which offers significant capacity increase, should be sacrificed to meet certain QoS targets. We present an opportunistic scheduling scheme under resource-sharing constraints. The scheduler solves the weighted fairness by diverting a fraction of resources from surplus users to underserved users. Given the average received signal-to-noise ratios (SNR) of users and resource-sharing constraints, the capacity of the proposed scheduler is analyzed over Rayleigh fading channels. Degree of weighted fairness for various scheduling schemes is also provided. Numerical results illustrate that while sacrificing a fraction of the achievable total capacity the proposed scheduler provides perfect weighted fairness.

关键词： Wireless networks Quality of service Scheduling algorithm Processor scheduling Diversity methods adaptive algorithm Iterative algorithms Wireless communication adaptive scheduling Signal to noise ratio

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FIR-MYRIAD Hybrid Filters for Signal Processing in Impulsive Noise Environments

FIR-MYRIAD Hybrid Filters for Signal Processing in Impulsive...

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Bin Lin ChengYu Zhang XuDong Wang Chen Gu Baisuo Wang Information Engineering College Dalian Maritime University Dalian Liaoning China

A new class of nonlinear filters called FIR-weighted myriad hybrid (FIR-WMyH) filters was introduced. These filters have a combination structure of linear FIR filters and weighted myriad filter, and can efficiently utilize the special strongpoint of two filters. Through the backpropagation algorithm used in the neural networks, we derive a stochastic gradient-based adaptive algorithm for determining optimal FIR-WMyH filters under the mean square error (MSE) criterion. In two impulsive noise models, the robust performance of this adaptive algorithm is demonstrated through the computer simulation results.

关键词： Signal processing Working environment noise Finite impulse response filter Nonlinear filters adaptive algorithm Signal processing algorithms Backpropagation algorithms Neural networks Stochastic resonance adaptive filters

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Multistage semi-blind adaptive multiuser detector for reverse link in CDMA systems

Multistage semi-blind adaptive multiuser detector for revers...

引用

IEEE International Conference on Communications (ICC)

作者： Zhiyu Xu R.S. Cheng Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

We develop a novel multistage semiblind multiuser detection technique for the reverse link in direct sequence (DS) code-division multiple access (CDMA) systems. This approach fully utilizes all known users' information, performs interference cancellation (IC) to suppress the interferers within the cell, and exploits a blind adaptive decision-directed (DD) MMSE detector to suppress the inter-cell interference. This process can be made iterative and in the multistage process, the tentative decision bits from DD-MMSE detectors can be fed back to the IC part to make interference regeneration more accurate. A simplified adaptive algorithm for this multistage semi-blind detectors is designed. Two upper bounds for the signal-to-noise-interference ratio (SIR) of the multistage semiblind detector are derived. It is shown that the proposed detector has a significant performance gain over that of the pure blind detectors and the non-blind detectors. The tracking capability of the proposed semi-blind detector in a dynamic environment is examined with simulations.

关键词： Detectors Multiaccess communication Multiuser detection Interference suppression Interference cancellation Performance gain Multiple access interference Iterative algorithms algorithm design and analysis adaptive algorithm

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A novel I/Q mismatch compensation scheme for a low-IF receiver front-end

A novel I/Q mismatch compensation scheme for a low-IF receiv...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： J. Chabloz C. Enz Swiss Center for Electronics and Microtechnology Neuchatel Switzerland

Any quadrature IF front-end inherently suffers from mismatch between its I and Q paths. This results in an image rejection degradation, thus decreasing the dynamic range. In this paper, a novel mismatch compensation scheme for a low-IF receiver, but also suitable to many other quadrature front-ends, is proposed. With this approach, gain and phase imbalance corrections result independently from simply two gain adjustments. This allows an analog realization, therefore avoiding costly DSP implementation. In order to compute the wanted compensation gains, an LMS-type adaptive algorithm is also proposed. Its robustness and stability are investigated by extensive simulations.

关键词： Frequency Filters Degradation Robust stability Computer architecture Dynamic range Digital signal processing adaptive algorithm Computational modeling Local oscillators

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Power vs. performance tradeoffs for reduced resolution adaptive equalizers

Power vs. performance tradeoffs for reduced resolution adapt...

引用

MILCOM, Military Communications Conference

作者： A.O. Hero R. Gupta Department of EECS University of Michigan Ann Arbor MI USA

adaptive channel equalization algorithms are commonly used in wireless communications receivers to counter intersymbol interference, multipath dispersion, and other time varying channel degradations. We obtain approximate expressions for the increase in mean square error of the LMS adaptive algorithm when the total processing power is decreased by reducing the number of data and filter coefficient bits used by the algorithm. We also obtain expressions for the power-optimal bit-allocation factor which determines the proportion of the bits allocated to the data vs. allocated to the coefficients. Numerical studies are presented for an exponential memory ISI channel and 4-ary PSK signalling. These studies indicate that as few as 8 bits total are needed to equalize the channel and that most of these bits (6 out of 8) should be allocated to the filter coefficients.

关键词： Intersymbol interference adaptive equalizers Wireless communication Counting circuits Degradation Mean square error methods Least squares approximation adaptive algorithm adaptive filters Phase shift keying

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