Accession Number : ADP006285

Title :   HF Channel Occupancy and Subband Congestion: The Other-User Interference Problem,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Stehle, Roy H. ; Hagn, George H.

Report Date : 03 MAY 1990

Pagination or Media Count : 12

Abstract : Information on other-use interference is important in predicting the performance of high-frequency (HF) systems. For many systems, especially frequency-hopping systems, other-user interference frequently is more important than man-made noise from incidental radiators (e.g., power lines) or atmospheric noise from lightning. Occupancy of individual channels and congestion of allocated HF subbands (e.g., fixed and mobile, amateur) vary with type of service, frequency, time of day, season, angle of arrival, type of receiving antenna, bandwidth, threshold, geographic location, and sunspot number. This paper summarizes channel occupancy and subband congestion observations made in the continental United States (CONUS) and Europe in 1987 with SRI International's Mobile Spectrum Monitoring Unit (MSMU). The data on subband congestion are compared with the empirical model developed by researchers at the University of Manchester Institute for Science and Technology (UMIST), Manchester, United Kingdom (UK). A concept for extending the UMIST model for congestion at a point to a model for congestion within a region is described.

Descriptors :   *RADIO INTERFERENCE, HIGH FREQUENCY, CHANNELS, FREQUENCY ALLOCATION, CROSSTALK, FREQUENCY AGILITY.

Subject Categories : Radiofrequency Wave Propagation
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE