19-GHz rain attenuation characteristics on four tandem links

Rain attenuation measurements of 19 GHz were made on four tandem links at Musashino district near Tokyo. This paper discusses the characteristics of rain fade probabilities on tandem links. A multiplicative factor which reduces the worst case estimate of adaptive probabilities developed. This factor increases (approaches 1) as the rain attenuation becomes deeper. The measured modification factor at a rain attenuation of 30 dB was about 0.81 on four tandem links, 0.82 on three tandem links, and 0.88 on two tandem links. It has a tendency to saturate with an increase in the number of links.