Results 1 - 10 of 582

Optimality of Myopic Sensing in Multichannel Opportunistic Access

by Sahand Haji Ali Ahmad, Mingyan Liu, Tara Javidi, Qing Zhao, Bhaskar Krishnamachari , 2008
"... We consider opportunistic communication over multiple channels where the state (“good ” or “bad”) of each channel evolves as independent and identically distributed Markov processes. A user, with limited channel sensing and access capability, chooses one channel to sense and subsequently access (bas ..."
Abstract - Cited by 112 (38 self) - Add to MetaCart
. This problem can be cast as a Partially Observable Markov Decision Process (POMDP) or a restless multi-armed bandit process, to which optimal solutions are often intractable. We show in this paper that a myopic policy that maximizes the immediate one-step reward is always optimal when the state transitions

Multichannel blind iterative image restoration

by Jan Flusser, Senior Member - IEEE Trans. Image Processing , 2003
"... Abstract—Blind image deconvolution is required in many ap-plications of microscopy imaging, remote sensing, and astronom-ical imaging. Unfortunately in a single-channel framework, serious conceptual and numerical problems are often encountered. Very recently, an eigenvector-based method (EVAM) was p ..."
Abstract - Cited by 47 (7 self) - Add to MetaCart
) was proposed for a multichannel framework which determines perfectly convolu-tion masks in a noise-free environment if channel disparity, called co-primeness, is satisfied. We propose a novel iterative algorithm based on recent anisotropic denoising techniques of total variation and a Mumford–Shah functional

An integrated solution for online multichannel noise tracking and reduction

by Mehrez Souden, Jingdong Chen, Senior Member, Jacob Benesty, Sofiène Affes, Senior Member - IEEE Trans. Audio, Speech, Lang. Process , 2011
"... Abstract—Noise statistics estimation is a paramount issue in the design of reliable noise-reduction algorithms. Although significant efforts have been devoted to this problem in the literature, most developed methods so far have focused on the single-channel case. When multiple microphones are used, ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
-SPP and multichannel noise estimator, we integrate them into three variants of the multichannel noise reduction Wiener filter. Exper-imental results show the advantages of the proposed solution. Index Terms—Microphone array, minima controlled recursive averaging (MCRA), multichannel noise reduction, multichannel

Multichannel Equalization In Subbands

by Stephan Weiss, Garrey W. Rice, Robert W. Stewart - Proc. IEEE WASPAA'99 , 1999
"... For the dereverberation of acoustic channels or the rendering of a specific sound field, the inversion of acoustics is a central problem and generally involves multichannel techniques. In this paper, we introduce a subband approach to the adaptive solution of this equalization problem. The presented ..."
Abstract - Cited by 4 (1 self) - Add to MetaCart
For the dereverberation of acoustic channels or the rendering of a specific sound field, the inversion of acoustics is a central problem and generally involves multichannel techniques. In this paper, we introduce a subband approach to the adaptive solution of this equalization problem

On the Problem of Multi-Channel Communication

by Michal Nagy
"... Abstract. This paper discusses the issue of multi-channel communication. Multi-channel communication is a vision of future electronic business communication that is based on abstract messages, formal domain descriptions, formal communication channel descriptions and context-aware computing. We prese ..."
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Abstract. This paper discusses the issue of multi-channel communication. Multi-channel communication is a vision of future electronic business communication that is based on abstract messages, formal domain descriptions, formal communication channel descriptions and context-aware computing. We

Scalar Mesons and Multichannel Amplitudes

by R. Kamiński, B. Loiseau, Place Jussieu , 2008
"... Properties of scalar–isoscalar mesons are analysed in an unitary model using separable interactions in three decay channels: ππ, KK and an effective 2π2π. We obtain different solutions by fitting various data on the ππ and KK phase shifts and inelasticities including the CERN-Cracow-Munich measureme ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
Properties of scalar–isoscalar mesons are analysed in an unitary model using separable interactions in three decay channels: ππ, KK and an effective 2π2π. We obtain different solutions by fitting various data on the ππ and KK phase shifts and inelasticities including the CERN

Multichannel excitation of the quasi-continuum

by Ronald S. Burkey, C. D. Cantrell , 1984
"... For a quantum system in which a continuous or quasi-continuous band of levels is excited by means of several di-pole interaction channels, we develop a mathematical theory that simplifies the numerical solution of the Schr6-dinger equation. The theory allows time-varying electric fields (or electric ..."
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For a quantum system in which a continuous or quasi-continuous band of levels is excited by means of several di-pole interaction channels, we develop a mathematical theory that simplifies the numerical solution of the Schr6-dinger equation. The theory allows time-varying electric fields (or

Spatial filtering in multichannel magnetoencephalography

by P. Nicolas, M. Kouwenhoven , 1987
"... Partial d~$erantial equations in boundary-value problems have been studied in order to estimate the influence of several geometrical and physical parameters involved in the outward transmission of the brain’s magnetic,field. Explicit Green kernels are used to obtain ‘integral forms of generalized.so ..."
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Partial d~$erantial equations in boundary-value problems have been studied in order to estimate the influence of several geometrical and physical parameters involved in the outward transmission of the brain’s magnetic,field. Explicit Green kernels are used to obtain ‘integral forms of generalized.solutions

Multichannel protocols to prevent relay attacks

by Frank Stajano, Ford-Long Wong, Bruce Christianson , 2009
"... A number of security systems, from Chip-and-PIN payment cards to contactless subway and train tokens, as well as secure localization systems, are vulnerable to relay attacks. Encrypting the communication between the honest endpoints does not protect against such attacks. The main solution that has ..."
Abstract - Cited by 9 (1 self) - Add to MetaCart
A number of security systems, from Chip-and-PIN payment cards to contactless subway and train tokens, as well as secure localization systems, are vulnerable to relay attacks. Encrypting the communication between the honest endpoints does not protect against such attacks. The main solution that has

MULTICHANNEL CHIRAL APPROACH FOR KAONIC HYDROGEN

by A Cieplý , 2007
"... Abstract We present an exact solution to the K − -proton bound state problem formulated in the momentum space. The 1s level characteristics of the kaonic hydrogen are described together with the available low energy KN data. ..."
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Abstract We present an exact solution to the K − -proton bound state problem formulated in the momentum space. The 1s level characteristics of the kaonic hydrogen are described together with the available low energy KN data.
Results 1 - 10 of 582