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Signal beam

About: Signal beam is a research topic. Over the lifetime, 1881 publications have been published within this topic receiving 20717 citations.


Papers
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Journal ArticleDOI
TL;DR: A theoretical and experimental study of photorefractive nonlinear multi two-wave mixing is given in this article, which is used to describe the fanning effect, which is an asymmetric self induced light scattering process, and is shown to originate from amplified noise.

128 citations

Patent
Tao Chen1, Fuyun Ling1, Jack M. Holtzman1, Yu-Cheun Jou1, Stein A. Lundby1 
29 Sep 2000
TL;DR: In this article, a method and apparatus for wireless communications wherein a base station transmits a signal to sending data to a subscriber station (108) through a signal beam (110) that sweeps through the coverage area of the base station (102).
Abstract: A method and apparatus for wireless communications wherein a base station (102) transmits a signal to sending data to a subscriber station (108) through a signal beam (110) that sweeps through the coverage area of the base station (102). User data addressed to the subscriber station (108) is buffered until the signal beam angle of the signal (110) beam allows efficient transmission. The base station (102) may alter the beam sweep speed or the shape of the beam's radiation pattern (106) over time to maximize system efficiency and capacity.

128 citations

Proceedings Article
01 Jan 2003
TL;DR: Collinear holographic memory is proposed and demonstrated, which enables us to reconstruct the hologram image with a collinear optical configuration.
Abstract: Collinear holographic memory is proposed and demonstrated. "Reference beam" and "signal beam" are bundled on the same axis, and irradiated on the recording medium through a single objective lens. This method enables us to reconstruct the hologram image with a collinear optical configuration.

128 citations

Journal ArticleDOI
TL;DR: In this paper, the authors show that the need for such a filter cavity can be eliminated, by exploiting EPR-entangled signals and idler beams, by harnessing their mutual quantum correlations and the difference in the way each beam propagates in the interferometer, and they can engineer the input signal beam to have the appropriate frequency-dependent conditional squeezing once the outgoing idler beam is detected.
Abstract: In continuously monitored systems the standard quantum limit is given by the trade-off between shot noise and back-action noise. In gravitational-wave detectors, such as Advanced LIGO, both contributions can be simultaneously squeezed in a broad frequency band by injecting a spectrum of squeezed vacuum states with a frequency-dependent squeeze angle. This approach requires setting up an additional long baseline, low-loss filter cavity in a vacuum system at the detector’s site. Here, we show that the need for such a filter cavity can be eliminated, by exploiting Einstein–Podolsky–Rosen (EPR)-entangled signals and idler beams. By harnessing their mutual quantum correlations and the difference in the way each beam propagates in the interferometer, we can engineer the input signal beam to have the appropriate frequency-dependent conditional squeezing once the out-going idler beam is detected. Our proposal is appropriate for all future gravitational-wave detectors for achieving sensitivities beyond the standard quantum limit.

115 citations

Patent
26 Oct 2004
TL;DR: In this paper, the authors proposed a mixed-beam embodiment of the user-specific signal and the common signal in a mixed beam embodiment, where the processing circuitry ensures the users' signals are time-aligned and have a controlled phase difference when received at mobile stations in the sector cell.
Abstract: An antenna array in a radio node includes multiple antenna elements for transmitting a wider beam covering a majority of a sector cell that includes a common signal and a narrower beam covering only a part of the sector cell that includes a mobile user-specific signal. Transmitting circuitry is coupled to the antenna array, and processing circuitry is coupled to the transmitting circuitry. The processing circuitry ensures the user-specific signal and the common signal in a mixed beam embodiment are in-phase and time-aligned at the antenna array. In a steered beam embodiment, the processing circuitry ensures the user-specific signal and the common signal are time-aligned and have a controlled phase difference when received at mobile stations in the sector cell. In both embodiments, distortions in the common signal and the user-specific signal associated with their conversion from baseband frequency to radio frequency are also compensated. And in the steered beam embodiment, beam forming weights are used not only to radiate a narrower beam to the desired mobile user but also to direct a wider common signal beam to reach all mobile users in the cell.

114 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202215
202131
202040
201929
201844