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Rain fade compensation alternatives for ka band communication satellites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Acosta, Roberto J. |
| Copyright Year | 1997 |
| Description | Future satellite communications systems operating in Ka-band frequency band are subject to degradation produced by the troposphere which is much more severe than those found at lower frequency bands. These impairments include signal absorption by rain, clouds and gases, and amplitude scintillation's arising from refractive index irregularities. For example, rain attenuation at 20 GHz is almost three times that at 11 GHz. Although some of these impairments can be overcome by oversizing the ground station antennas and high power amplifiers, the current trend is using small (less than 20 inches apertures), low-cost ground stations (less than $1000) that can be easily deployed at user premises. As a consequence, most Ka-band systems are expected to employ different forms of fade mitigation that can be implemented relatively easily and at modest cost. The rain fade mitigation approaches are defined by three types of Ka-band communications systems - a low service rate (less than 1.5 Mb/s), a moderate service rate (1.5 to 6 Mb/s) system and a high service rate (greater than 43 Mb/s) system. The ACTS VSAT network, which includes an adaptive rain fade technique, is an example of a moderate service rate. |
| File Size | 177105 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970037774 |
| Archival Resource Key | ark:/13960/t3615zq92 |
| Language | English |
| Publisher Date | 1997-08-01 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Downlinking Fading Extremely High Frequencies Rain Wetting Compensation Troposphere Uplinking Communication Satellites Vsat Network Satellite Communication Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
