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The use of optical (laser) feeder-links for next generation telecommunication satellites is receiving strong interest from commercial telecommunication providers because it will soon not be possible to support the projected growth in bandwidth using radio frequency bands (e.g. Ka-band). Moving to higher radio frequencies such as the Q/V or W-bands does not dramatically improve available bandwidth, while it increases atmospheric attenuation to a level comparable with the laser communication bands. Cloud coverage can be mitigated by site diversity, namely by using multiple (e.g.
ONERA
The Doherty concept has proven to be a very effective technique for designing amplifiers, which maintain a high efficiency over a wide range of operating conditions. This technique is extensively used in terrestrial applications like base stations where power efficiency is getting more and more attention. Power efficiency is also of concern for space and the Doherty concept could certainly help in designing more efficient PAs. Ka-band is now being considered for mobile services that could offer very high capacity as compared to the existing ones at L-band.
UNITED MONOLITHIC...
Current X-Band links from Satellite to Ground for medium data rates are limited in gain and to one beam.
Alcatel Telecom
The aim of this project is to develop technology aimed at future Mobile Communications Satellite Systems. A critical element within these systems are the Transmit and Receive moduls wich are the subject of this crontract.
This report summarises the measured phase tracking performance results achieved for SN01 versus SN02 L-Band SSPA's manufactured under this contract.
Marta Marconi Space
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