Abstract
NASA's Advanced Communications Technology Satellite (ACTS) has afforded the opportunity to study the effects of various types of interference on high data rate satellite links. Such interference can result from adjacent satellite spot beams, inadequate isolation between beams, improperly pointed earth terminal antennas, depolarization due to atmospheric and rain conditions, adjacent satellite systems, or improper synchronization of ground terminal transmissions. The most recent series of interference experiments using ACTS involves modulated co-channel and adjacent channel interference for high data rate TDMA transmission through the ACTS wideband non-regenerative channel. A series of tests in which adjacent channel or co-channel continuous modulated signals interfere with a bursted TDMA signal has been completed. The purpose of these tests was to determine the degradation of the biterror rate of the TDMA signal resulting from the interference, and the minimum interference level at which resulting degradation was negligible. This paper explains the experiment procedures and presents the experiment results.
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