Journal ArticleDOI
Application of open-loop uplink power control in Ka-band satellite links
A.W. Dissanayake
- Vol. 85, Iss: 6, pp 959-969
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TLDR
To maintain the control accuracy within reasonable limits, an algorithm that can differentiate various propagation factors as well as equipment effects was devised and it was found that under most conditions, the power control accuracy could be maintained within /spl plusmn/2.5 dB.Abstract:
Propagation impairments impose a limit on the use of the 20/30-GHz frequency band for satellite communication applications. Power control is one of the techniques that can be used to mitigate such impairments. Results of an experiment conducted using the Advanced Communications Technology Satellite (ACTS) to evaluate the efficacy of open-loop uplink power control are presented. A power control system is required to maintain the power flux received at the satellite at a constant level irrespective of the fading along the propagation path. The control parameter for the power controller was derived from the fading and enhancements observed on a downlink beacon signal thus requiring frequency translation of the propagation effects to the uplink frequency. In this scheme, the controller performance is largely a function of the frequency translation accuracy, which is determined by the prevailing propagation conditions. In addition, equipment-induced variations in the control parameter can produce power control errors. To maintain the control accuracy within reasonable limits, an algorithm that can differentiate various propagation factors as well as equipment effects was devised. It was found that under most conditions, the power control accuracy could be maintained within /spl plusmn/2.5 dB.read more
Citations
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Journal ArticleDOI
Satellite communications at KU, KA, and V bands: Propagation impairments and mitigation techniques
TL;DR: This article surveys the alternative fade mitigation techniques for satellite communication systems operating at Ku, Ka and V frequency bands and discusses the specific phenomena influencing the propagation of radiowaves on Earth-space links.
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Climatic radiowave propagation models for the design of satellite communication systems
TL;DR: In this article, the effect of weather on the propagation of satellite signals has been studied, including the effect due to rain, scintillation due to tropospheric turbulence, and depolarisation due to ice crystals.
Journal ArticleDOI
Quality of service for satellite IP networks: a survey
Sastri L. Kota,Mario Marchese +1 more
TL;DR: To meet future application requirements, satellite is an excellent candidate due to features such as global coverage, bandwidth flexibility, broadcast, multicast and reliability.
Journal ArticleDOI
ACTS propagation experiment: experiment design, calibration, and data preparation and archival
TL;DR: The National Aeronautics and Space Administration Advanced Communications Technology Satellite (ACTS) propagation experiment was designed to obtain slant-path attenuation statistics for locations within the United States and Canada for use in the design of low-margin Ka-band satellite communication systems.
References
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Journal ArticleDOI
Light Scattering by Small Particles
H. C. Van de Hulst,V. Twersky +1 more
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Book
Light Scattering by Small Particles
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Journal ArticleDOI
Path diversity in propagation of millimeter waves through rain
TL;DR: In this article, a four-year sample of rainfall data obtained on a highly resolving areal rain gauge network in Bedfordshire, England was used to compute the cumulative distributions of attenuation due to rain for the frequencies 11,18.5, and 30 GHz.
Journal ArticleDOI
Results from the 19- and 28-GHz COMSTAR satellite propagation experiments at Crawford Hill
D.C. Cox,H.W. Arnold +1 more
TL;DR: In this paper, the effects of rain and ice on radio propagation have been measured using the COMSTAR satellites at Crawford Hill, New Jersey, using the 19-and 28-GHz beacons on the satellites, and the results provide empirical design data and serve as checks on theoretical models needed for predicting communication system performance in geographical regions where measurements are not available.