Compensation of rain fading in 20/30 GHz FDMA systems using satellite multiple-beam antennas
Abstract
The use of reconfigurable multiple-beam antennas (MBAs) as an alternative means of compensating for rain fading under conditions where satellite ground terminals cannot exploit site diversity is considered. It is shown that when a sufficient number of terminals participate in the adaptive scheme for allocating satellite antenna gains, an FDMA network allows adequate resource sharing. Computer algorithms developed to optimize the instantaneous gains of the receiving MBA, the transmitting MBA, and a nonlinear transponder are discussed. Very substantial fade margins are thought to be possible when each terminal can be covered by an individually adjustable antenna beam. In a network of 40 terminals interconnected by 30/20 GHz SCPC carriers, equivalent fade margins of 28 dB and 13 dB (for 30 GHz up-links and 20 GHz down-links, respectively) are feasible.
- Publication:
-
ICC 1981; International Conference on Communications, Volume 3
- Pub Date:
- 1981
- Bibcode:
- 1981icc.....3...54D
- Keywords:
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- Adaptive Control;
- Antenna Radiation Patterns;
- Frequency Division Multiple Access;
- Microwave Transmission;
- Satellite Antennas;
- Signal Fading;
- Communication Networks;
- Computerized Simulation;
- Ground Stations;
- Raindrops;
- Signal Stabilization;
- Transponders;
- Communications and Radar