Rain attenuation characteristics on 20 GHz band multirelay links

The performance of rain outage time on multirelay links that are necessary for circuit design of millimeter communication systems is examined. The analysis is based on about four years of rain attenuation data at 20 GHz band on 13 tandem links near Tokyo. Using these data, the path separation dependency of the joint probability and the path correlation coefficient due to rain are made clear. Also, the outage time probability and the thermal noise accumulation due to rain on multirelay links are evaluated on the basis of observed data. These results are applicable to the design of a millimeter wave multirelay transmission system.