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Interference (wave propagation)

About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.


Papers
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Journal ArticleDOI
TL;DR: In this Letter, elastic waves in a disordered waveguide are studied and direct experimental evidence of the bimodal law is presented.
Abstract: Thirty years ago, theorists showed that a properly designed combination of incident waves could be fully transmitted through (or reflected by) a disordered medium, based on the existence of propagation channels which are essentially either closed or open (bimodal law). In this Letter, we study elastic waves in a disordered waveguide and present direct experimental evidence of the bimodal law. Full transmission and reflection are achieved. The wave field is monitored by laser interferometry and highlights the interference effects that take place within the scattering medium.

80 citations

Journal ArticleDOI
TL;DR: In this article, the amplitude and phase of the electric field of ultrashort laser pulses using spatially resolved spectral interferometry is reconstructed using a fiber-optic coupler interferometer.
Abstract: We propose what we believe to be a novel method to reconstruct the spatiotemporal amplitude and phase of the electric field of ultrashort laser pulses using spatially resolved spectral interferometry. This method is based on a fiber-optic coupler interferometer that has certain advantages in comparison with standard interferometer systems, such as being alignment-free and selection of the reference beam at a single point. Our technique, which we refer to as the SpatioTemporal Amplitude-and-phase Reconstruction by Fourier-transform of Interference Spectra of High-complex-beams, offers compactness and simplicity. We report its application to the experimental characterization of chirped pulses and to spatiotemporal reconstructions of a convergent beam as well as plane-plane and spherical-plane waves interferences, which we check with our simulations.

80 citations

Patent
14 Aug 2009
TL;DR: In this article, a DSA-enabled device senses spectrum use in a region and, based on the detected spectrum use, selects one or more communication channels for use, while avoiding or reducing interference with other devices.
Abstract: Methods and systems for dynamic spectrum access (DSA) in a wireless network are provided. A DSA-enabled device may sense spectrum use in a region and, based on the detected spectrum use, select one or more communication channels for use. The devices also may detect one or more other DSA-enabled devices with which they can form DSA networks. A DSA network may monitor spectrum use by cooperative and non-cooperative devices, to dynamically select one or more channels to use for communication while avoiding or reducing interference with other devices.

80 citations

Journal ArticleDOI
TL;DR: A novel two-stage adaptive array architecture that incorporates combined spatial diversity and constraint-based beamforming that is suitable for real-time implementation and can be used in conjunction with traditional coding schemes to increase the link-margin.
Abstract: This paper considers the problem of mitigating fading and interference in wireless orthogonal frequency division multiplexing (OFDM) multiple access communication systems. Applications include cellular mobile radio, wireless local loop, and wireless local area networks. The effect of interchannel interference (ICI) arising from time-selective fading and frequency offsets and co-channel interference (CCI) is analyzed. A loop-timing method that enables a synchronous uplink between multiple mobile transceivers and a base-station is described. Adaptive antenna arrays are utilized at the base for uplink reception, and optimum array combining based on the maximum SINR criterion is used for each subchannel over slowly time-varying channels. For operation over fast time-varying channels, a novel two-stage adaptive array architecture that incorporates combined spatial diversity and constraint-based beamforming is presented. While ICI alone is most effectively overcome by spatial diversity, combined beamforming and diversity are most effective to combat CCI in the presence of fading. The overall method is suitable for real-time implementation and can be used in conjunction with traditional coding schemes to increase the link-margin.

80 citations

Journal ArticleDOI
TL;DR: In this article, the interference of the low-energy electron multiply scattered amplitudes can be eliminated by averaging data taken with different diffraction geometry but at fixed momentum transfer, which essentially yields a measurement of the kinematic intensities, which are most directly useful for surface crystallography.
Abstract: It is demonstrated that the interference of the low-energy-electron multiply scattered amplitudes can be in large part eliminated by averaging data taken with different diffraction geometry but at fixed momentum transfer. This essentially yields a measurement of the kinematic intensities, which are most directly useful for surface crystallography.

80 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202213
2021840
20201,221
20191,432
20181,351
20171,311