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Rain Fade Compensation for Ka-Band Communications SatellitesThis report provides a review and evaluation of rain fade measurement and compensation techniques for Ka-band satellite systems. This report includes a description of and cost estimates for performing three rain fade measurement and compensation experiments. The first experiment deals with rain fade measurement techniques while the second one covers the rain fade compensation techniques. The third experiment addresses a feedback flow control technique for the ABR service (for ATM-based traffic). The following conclusions were observed in this report; a sufficient system signal margin should be allocated for all carriers in a network, that is a fixed clear-sky margin should be typically in the range of 4-5 dB and should be more like 15 dB in the up link for moderate and heavy rain zones; to obtain a higher system margin it is desirable to combine the uplink power control technique with the technique that implements the source information rate and FEC code rate changes resulting in a 4-5 dB increase in the dynamic part of the system margin. The experiments would assess the feasibility of the fade measurements and compensation techniques, and ABR feedback control technique.
Document ID
19980019442
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mitchell, W. Carl (Space Systems/Loral Palo Alto, CA United States)
Nguyen, Lan (Communications Satellite Corp. Clarksburg, MD United States)
Dissanayake, Asoka (Communications Satellite Corp. Clarksburg, MD United States)
Markey, Brian (Communications Satellite Corp. Clarksburg, MD United States)
Le, Anh (Communications Satellite Corp. Clarksburg, MD United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1997
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
E-11024
NAS 1.26:206591
NASA/CR-97-206591
SS/L-TR01363
Funding Number(s)
CONTRACT_GRANT: NAS3-27559
PROJECT: RTOP 315-90-2C
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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