HF Channel Occupancy and Subband Congestion: The Other-User Interference Problem,
SRI INTERNATIONAL MENLO PARK CA
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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 Internationals 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.
- Radiofrequency Wave Propagation
- Electricity and Magnetism