Medium-range terrestrial propagation study at 28 GHz

摘要

Abstract: Millimeter wave communications systems experience variation in propagation due to rain and other causes. This paper describes a 7.25 km experimental link at 28 GHz in Dallas, Texas used for studying propagation effects. Received signal data was collected at 30 second intervals over a five month period. The data shows the effects of clear air variation and rain fade loss. Weather data including rain rate was also collected at 1 minute intervals at the transmit and receive sites. During the observation period, rain rates greater than 38 mm/hr and fades greater than 44 dB occurred less than 0.01% of the time. During rain fades, the received signal varied at a maximum rate of 0.3 dB/sec. Rain fades of 20 dB or less extended for duration of 40 minutes. During clear days, signal variations of up to 7 dB occurred including enhancement and attenuation. The standard deviation of clear air fading was about 1 dB. !16