A Study of the Potential Interference Between Satellite and Terrestrial Systems in the 28 GHz Band

摘要

The Federal Communications Commission (FCC) of the United States completed a Negotiated Rulemaking Committee in September, 1994 to determine methods for frequency sharing of the 27.5 to 29.5 GHz spectrum between terrestrial Local Multipoint Distribution Service systems and Fixed Satellite Service systems. The committee concluded that based on current commercially proven technology, these services could not share the same spectrum, due to expected unacceptable levels of mutual interference. Analysis and laboratory and field tests performed by NASA's Lewis Research Center contributed technical data which was used to support this conclusion. NASA's results indicate levels of carrier-to- interference ratios (C/I) which create perceptible degradation, the levels of C/I which might be expected in typical operational scenarios, and the level of reflected signals which might be found in the vicinity of transmitting FSS ground terminals.