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Bandwidth (signal processing)

About: Bandwidth (signal processing) is a research topic. Over the lifetime, 48550 publications have been published within this topic receiving 600741 citations. The topic is also known as: Bandwidth (signal processing) & bandwidth.


Papers
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Journal ArticleDOI
TL;DR: In this article, an ultrawideband, tightly coupled dipole array (TCDA) was proposed to support multiple satellite communication bands, simultaneously such antennas enable weight reduction by replacing multiple antennas and provide spectral efficiency by reusing intermediate frequencies for inter-satellite communication.
Abstract: In space-borne applications, reduction of size, weight, and power can be critical Pursuant to this goal, we present an ultrawideband, tightly coupled dipole array (TCDA) capable of supporting numerous satellite communication bands, simultaneously Such antennas enable weight reduction by replacing multiple antennas In addition, it provides spectral efficiency by reusing intermediate frequencies for inter-satellite communication For ease of fabrication, the array is initially designed for operation across the UHF, L, S, and lower-C bands (06–36 GHz), with emphasis on dual-linear polarization, and wide-angle scanning The array achieves a minimum 6:1 bandwidth for VSWR less than 18, 24, and 31 for 0°, 45°, and 60° scans, respectively The presented design represents the first practical realization of dual polarizations using a TCDA topology This is accomplished through a dual-offset, split unit cell with minimized inter-feed coupling Array simulations are verified with measured results of an ${\bf{8}}\times {\bf{8}}$ prototype, exhibiting very low cross polarization and near-theoretical gain across the band Further, we present a TCDA design operating across the upper-S, C, X, and Ku bands (3–18 GHz) The array achieves this 6:1 bandwidth for VSWR $ at broadside, and VSWR $ at 45° A discussion on design and fabrication for low-cost arrays operating at these frequencies is included

101 citations

Journal ArticleDOI
TL;DR: The developed channel model allows system design engineers to generate realizations of propagation channel efficiently for designing Kiosk-fashion close-proximity communication systems in the THz band.
Abstract: Terahertz (THz) Kiosk application offers ultrahigh downloads of digital information to users’ handheld devices. System configuration and multiple paths between the transmitter and receiver have important impact on the achievable data rates. In this paper, the propagation channel of THz Kiosk downloading application is investigated and a stochastic channel model is proposed. Based on channel measurements using a vector network analyzer, a 3-D ray-tracing simulator is calibrated to conduct simulations for an in-depth analysis of the different channel characteristics. Successively, the observed propagation paths are classified and the key channel parameters in time, frequency, and spatial domains are modeled for each type of ray. The resulting stochastic model is evaluated in terms of Rician K-factor and root mean square delay spread. Compared to the reference data, the mean absolute errors of these two metrics of the three investigated scenarios are less than 1.48 dB and 0.07 ns, respectively. The results show that the target 100 gigabits per second data rate is achievable at tens of gigahertz system bandwidth at proper communication distance and higher order modulation schemes. The developed channel model allows system design engineers to generate realizations of propagation channel efficiently for designing Kiosk-fashion close-proximity communication systems in the THz band.

101 citations

Journal ArticleDOI
TL;DR: In this paper, the performance limits of carrier-signal-injection-based sensorless control methods were studied. But the analysis focused on three key performance metrics: 1) the accuracy, 2) the bandwidth, and 3) the stability of the estimated position.
Abstract: This paper studies the performance limits of carrier-signal-injection-based sensorless control methods. When a high-frequency carrier-signal voltage is injected into a salient ac machine, two types of signals are created that can be used to estimate the rotor position: 1) the negative-sequence carrier-signal current and 2) the zero-sequence carrier-signal components. The limitations of ac machine sensorless control using each of these signals are analyzed in this paper. The analysis focuses on three key performance metrics: 1) the accuracy; 2) the bandwidth; and 3) the stability of the estimated position.

101 citations

Journal ArticleDOI
TL;DR: A simple method is presented for the stimulated Brillouin scattering (SBS) gain bandwidth reduction in an optical fiber by a superposition of the gain with two losses produced by the same source.
Abstract: We present a simple method for the stimulated Brillouin scattering (SBS) gain bandwidth reduction in an optical fiber. We were able to reduce the natural bandwidth of 20MHz to around 3.4MHz by a superposition of the gain with two losses produced by the same source. This reduced bandwidth can drastically enhance the performance of many different applications which up to now were limited by the minimum of the natural SBS bandwidth.

101 citations

Proceedings ArticleDOI
21 Jul 2013
TL;DR: In this article, the authors present a method to simulate, design and test the adequacy of a communication system for a particular transmission grid, where they formulate the communication requirements from the power grid application requirements.
Abstract: The rapid increase of phasor measurements on the high voltage power system has opened opportunities for new applications to enhance the operation of the grid. To take advantage of the high sampling rates of these measurement data, these applications will require a high-bandwidth, networked communication system. The specifications for this next generation communication system that will overlay the continental power grids are under intense discussion at this time by organizations like the North-American Synchro-Phasor Initiative (NASPI). In this paper we present a method to simulate, design and test the adequacy of a communication system for a particular transmission grid. The main difference from typical communication system studies is that we formulate the communication requirements from the power grid application requirements, that is, the communication design, simulation and testing is from the viewpoint of the anticipated power applications. Themethod is demonstrated on a WECC 225 bus and a Polish 2383 bus transmission system models.

101 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202217
20211,517
20202,656
20193,121
20183,100
20172,744