Site diversity for satellite earth terminals and measurements at 28 GHz
Article Abstract:
Site diversity concepts and models are reviewed, and the results of a site diversity experiment in which radiometers measured attenuation on earth-space paths are reported. Attenuation caused by rain impairs communications on satellite-earth paths, particularly above 10 GHz. Using two or more separate receiving sites effectively reduces attenuation caused by rain. Site diversity entails the specification of a way to bring signals from separate receiving terminals to a common location, synchronize them, and combine them. Of the five different techniques used to measure propagation, the most direct measures the signal from a satellite at several earth stations, but such signals are often not available during system planning; the drawbacks of the other four are examined. Fade-duration and interface-interval statistics are presented for the various sites and for systems using switching and maximal-ratio combining.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1993
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Satellite direct broadcast
Article Abstract:
The quintessential use of satellites is the direct broadcast of audio, video, or data to user receivers. Satellite direct broadcast (DBS) systems have been slow to appear, but they are expected to dominate the TV transmission field in Asia and are becoming more prevalent in Europe, Japan, and Australia, where cable systems have not made the progress they have in the US. DBS is expected to be used most in the US in rural areas where cable television is not practical.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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