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检索条件"主题词=Adaptive Algorithm"

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STABILIZATION OF adaptive EIGENVECTOR EXTRACTION BY CONTINUATION IN NESTED ORTHOGONAL COMPLEMENT STRUCTURE 41

STABILIZATION OF ADAPTIVE EIGENVECTOR EXTRACTION BY CONTINUA...

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41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Kakimoto, Kenji Kitahara, Daichi Yamagishi, Masao Yamada, Isao Tokyo Inst Technol Dept Commun & Comp Engn Tokyo Japan

ISBN: (纸本)9781479999880

Nguyen and Yamada [NY'13] proposed an adaptive algorithm for fast and stable extraction of the first generalized Hermitian eigen-vector and mentioned the extension to the first r generalized eigenvector extraction based on the nested orthogonal complement structure [NTY'12]. However, we recently found that the estimates of the eigenvectors are not expressed ideally in the time-varying coordinate system and can change drastically in a certain situation, which may cause numerical instability. In this paper, we propose a new expression of the estimates along with time-varying coordinate system. This modification can be done efficiently with additional multiplications of orthogonal complement matrices. Numerical experiments show that the modified scheme has better stability compared with the original scheme [NTY'12].

关键词： Generalized Hermitian eigenvalue problem (GHEP) adaptive algorithm Stabilization Orthogonal complement matrix Nested orthogonal complement structure

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adaptive Multi-level Workflow Scheduling with Uncertain Task Estimates 11th

Adaptive Multi-level Workflow Scheduling with Uncertain Task...

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11th International Conference on Parallel Processing and Applied Mathematics (PPAM)

作者： Dziok, Tomasz Figiela, Kamil Malawski, Maciej AGH Univ Sci & Technol Dept Comp Sci Al Mickiewicza 30 PL-30059 Krakow Poland

ISBN: (纸本)9783319321523;9783319321516

Scheduling of scientific workflows in IaaS clouds with payper-use pricing model and multiple types of virtual machines is an important challenge. Most static scheduling algorithms assume that the estimates of task runtimes are known in advance, while in reality the actual runtime may vary. To address this problem, we propose an adaptive scheduling algorithm for deadline constrained workflows consisting of multiple levels. The algorithm produces a global approximate plan for the whole workflow in a first phase, and a local detailed schedule for the current level of the workflow. By applying this procedure iteratively after each level completes, the algorithm is able to adjust to the runtime variation. For each phase we propose optimization models that are solved using Mixed Integer Programming (MIP) method. The preliminary simulation results using data from Amazon infrastructure, and both synthetic and Montage workflows, show that the adaptive approach has advantages over a static one.

关键词： Cloud Workflow Scheduling Optimization adaptive algorithm

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Performance Analysis of LMS based algorithms used for Impulsive Noise Cancellation

Performance Analysis of LMS based Algorithms used for Impuls...

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IEEE International Conference on Circuit, Power and Computing Technologies (ICCPCT)

作者： Panda, Sarthak Mohanty, Mihir Narayan SOA Univ ITER Dept ECE Bhubaneswar Odisha India

ISBN: (纸本)9781509012770

In real world application noise can degrade the performance of the system. It is affected by impulsive noise, as this type of noise highly depends on physical environment. Though adaptive filters are widely used for noise cancellation, still it requires robust parameter for all type of noise. In this paper, an attempt is taken for reduction of impulsive noise. Initially, the popular LMS algorithm is used for comparison and extends towards Fx-LMS. It shows significant result, but becomes unstable the due to the second order moment does not exist for Gaussian process. Further it has been analyzed with NLMS and the norm is exploited. It is found that WLMS algorithm performs better than all the above algorithms and also robust for impulsive noise. The results show its comparison performance.

关键词： adaptive algorithm Fx-LMS Impulsive Noise LMS NLMS WLMS

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Advanced adaptive algorithms for Double Talk Detection in Echo Cancellers: A Technical Review 3

Advanced Adaptive Algorithms for Double Talk Detection in Ec...

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3rd International Conference on Frontiers in Intelligent Computing - Theory and Applications (FICTA)

作者： Das, Vineeta Kar, Asutosh Chandra, Mahesh IIIT Dept Elect & Telecommun Engn Bhubaneswar Orissa India BIT Dept Elect & Commun Engn Mesra India

ISBN: (纸本)9783319120126;9783319120119

An acoustic echo cancellation system is one of the most important breakthrough in the field of adaptive systems. Today acoustic echo cancellers (AEC) are an integral part of full duplex hands-free voice communication. Conventional echo cancellers use a linear model to represent the echo path. However many consumer devices include loud-speakers and power amplifiers that generate non-linear distortions. Non-linearity occurs due to the use of low cost electronic loud speakers, microphones and poorly designed enclosures in an AEC system. Non-linearity causes vibration and harmonic distortion and also degrades the speech quality. Double talk detector (DTD) is a key component of an AEC. A DTD is used to sense when the far end signal is corrupted by the near end speech. The DTD freezes the adaptation of model filter to prevent the divergence of the adaptive filter. Various authors have proposed different algorithms for double talk detection. Some of the most popular algorithms are Geigel algorithm, cross-correlation based DTD, normalized cross correlation based DTD, variable impulse response DTD etc. In this paper several double talk detection algorithms in a non-linear platform of an AEC has been discussed.

关键词： acoustic echo canceller (AEC) double talk detector (DTD) adaptive filter adaptive algorithm cross-correlation non-linear acoustic echo canceller

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Scalable adaptive Multitarget Tracking Using Multiple Sensors

Scalable Adaptive Multitarget Tracking Using Multiple Sensor...

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IEEE-Communications-Society Global Communications Conference on Trusted Communications with Physical Layer Security (IEEE GLOBECOM)

作者： Meyer, Florian Braca, Paolo Hlawatsch, Franz Micheli, Michele LePage, Kevin D. Ctr Maritime Res & Experimentat La Spezia Italy TU Wien Inst Telecommun Vienna Austria

ISBN: (纸本)9781509024827

In networked mobile multitarget tracking systems, parameters such as detection probabilities, clutter rates, and motion model parameters are often unknown and time-varying. Such parameter variability can seriously degrade the performance of a multitarget tracking system. Here, we propose a Bayesian tracking framework in which the multisensor-multitarget tracking problem is formulated according to the measurement origin uncertainty paradigm and the unknown parameters-in the present case, the detection probabilities at the individual sensors-are modeled as Markov chains. The resulting Bayesian estimation problem is then solved using the belief propagation scheme. This approach results in a multisensor-multitarget tracking method that is able to adapt to the time variations of the detection probabilities. Moreover, the method has a low complexity that scales very well in all relevant system parameters. The performance of the method is assessed using data collected by a mobile underwater wireless sensor network.

关键词： Multitarget tracking data association belief propagation message passing factor graph adaptive algorithm underwater sensor network

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A dynamic rate adaptation algorithm using WB E-model for voice traffic over LTE network

A dynamic rate adaptation algorithm using WB E-model for voi...

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8th Wireless Days (WD) Conference

作者： Nguyen, Duy-Huy Nguyen, Hang Univ Paris Saclay SAMOVAR Telecom SudParis CNRS 9 Rue Charles Fourier F-91011 Evry France

ISBN: (纸本)9781509024940

This paper presents a dynamic adaptation algorithm of joint source-channel code rate for enhancing voice transmission over LTE network. In order to assess the speech quality, we use the Wideband (WB) E-model. In this model, both end-to-end delay and packet loss are taken into account. The goal of this paper is to find out the best suboptimal solution for improving voice traffic over LTE network with some constraints on allowed maximum end-to-end delay, allowed maximum packet loss and minimum required bandwidth. The best suboptimal choice is channel code rate corresponding to each mode of the AMR-WB codec that minimizes redundant bits generated by channel coding with an acceptable MOS reduction. Besides, this algorithm can be integrated with rate control in AMR-WB codec to offer the required mode of LTE network. Our results show that the MOS degradation is not significant, but the percent of reduced redundant bits to be very considerable. This will requires less bandwidth, thus, more mobile users can be served. The algorithm has simple computational operations, it can be applied to real-time voice communications.

关键词： AMR-WB Wideband E-model VoIP VoLTE Source-Channel code rate adaptive algorithm

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SPARSE COMPLEX FXLMS FOR ACTIVE NOISE CANCELLATION OVER SPATIAL REGIONS 41

SPARSE COMPLEX FXLMS FOR ACTIVE NOISE CANCELLATION OVER SPAT...

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41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Zhang, Jihui Abhayapala, Thushara D. Samarasinghe, Prasanga N. Zhang, Wen Jiang, Shouda Harbin Inst Technol Sch Elect Engn & Automat Harbin 150001 Peoples R China Australian Natl Univ Res Sch Engn Canberra ACT 2601 Australia

ISBN: (纸本)9781479999880

In this paper, we investigate active noise control over large 2D spatial regions when the noise source is sparsely distributed. The l(1) relaxation technique originated from compressive sensing is adopted and based on that we develop the algorithm for two cases: multipoint noise cancellation and wave domain noise cancellation. This results in two new variants (i) zero-attracting multi-point complex FxLMS and (ii) zero-attracting wave domain complex FxLMS. Both approaches use a feedback control system, where a microphone array is distributed over the boundary of the control region to measure the residual noise signals and a loudspeaker array is placed outside the microphone array to generate the anti-noise signals. Simulation results demonstrate the performance and advantages of the proposed methods in terms of convergence rate and spatial noise reduction levels.

关键词： Active noise control Multi-channel system adaptive algorithm Compressive sampling Wave domain

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A New adaptive algorithm for Two-Axis Sun Tracker without Sensor

A New Adaptive Algorithm for Two-Axis Sun Tracker without Se...

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1st International Conference on Computational Intelligence and Information Technology (CIIT 2011)

作者： Parvaresh, Ahmad Mohammadi, Seyed Mohammad Ali Azimi, Mohammad Mahdi Shahid Bahonar Univ Kerman Dept Elect Engn Kerman Iran Univ Tafresh Dept Elect Engn Tafresh Iran

ISBN: (纸本)9783642257339

In recent years, sun tracking systems are being increasingly developed to improve the efficiency of PV panels. Due to problems of tracking methods which uses optical sensors, new methods with less practical problems are developing day by day. In this article, we suggest a new method to reduce the problems which exist with sun tracking. In this method, instead of using optical sensor, an adaptive algorithm is used, where recursive equations are employed to calculate Azimuth and Elevation angles of sun. We applied this method on a two-axis sun tracker system with fixed panel on 45 system. Then calculate the efficiency of PV panels. Finally, by comparing the Results of this method with respect to method of optical sensors, it has been shown that the efficiency of this method is higher than methods which used optical sensors.

关键词： adaptive algorithm optical sensor two-axis sun tracker azimuth angle elevation angle

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AN IMPROVED SPEECH ENHANCEMENT algorithm BASED ON GENERALIZED SIDELOBE CANCELLER 5

AN IMPROVED SPEECH ENHANCEMENT ALGORITHM BASED ON GENERALIZE...

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5th International Conference on Audio, Language and Image Processing (ICALIP)

作者： Li Bin Zhang Ling-hua Nanjing Univ Posts & Telecommun Coll Telecommun & Informat Engn Nanjing 210003 Peoples R China Jiangsu Engn Res Ctr Commun & Network Technol Nanjing 210003 Peoples R China

ISBN: (纸本)9781509006540

In speech enhancement algorithm based on generalized sidelobe canceller (GSC), when there is error in direction estimating, the target speech will not be blocked by blocking matrix (BM) module completely. Then in the later multiple-input canceller (MC) module, the target speech will be eliminated, which will cause the leakage of the target speech. In this paper, a new optimization algorithm is proposed for the leakage of the speech caused by the error of signal direction of arrival (DOA). The blocking matrix would be adjusted adaptively according to the characteristics of the correlation between the final output of GSC and the output of BM module. This way, the estimated direction can be closer to the real target speech direction in the blocking matrix in order to reduce the leakage of the target speech and the leakage of the target speech in multiple-input canceller will be reduced. The simulation results show that the proposed algorithm have better speech enhancement performances in both objective and subjective evaluations.

关键词： generalized sidelobe canceller adaptive algorithm speech enhancement microphone array

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Learning boolean halfspaces with small weights from membership queries 25

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25th International Conference on algorithmic Learning Theory (ALT)

作者： Abasi, Hasan Abdi, Ali Z. Bshouty, Nader H. Technion Dept Comp Sci IL-32000 Haifa Israel Convent Nazareth High Sch Grade 11Abas 7 Haifa Israel

ISBN: (纸本)9783319116617

We consider the problem of proper learning of a boolean halfspace with integer weights {0, 1,..., t}, from membership queries only. The best known algorithm for this problem is an adaptive algorithm that asks n(0(t5)) membership queries, while the best lower bound for the number of membership queries is n(Omega(t)) [1]. In this paper we close this gap and give an adaptive proper learning algorithm with two rounds, and asking n(0(t)) membership queries. We also give a non-adaptive proper learning algorithm that asks n(0(t3)) membership queries. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Membership query Proper learning Boolean halfspaces Automata adaptive algorithm

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