Summary
International Symposium on Antennas and Propagation
2012
Session Number:4D1
Session:
Number:4D1-3
Quantitative Assessment of Site Diversity from Rainfall Spatial Correlation Characteristics
Satoshi Maeda, Hajime Fukuchi,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Satellite communication using high frequency bands is expected to transmit much information. But rainfall attenuation disturbs this benefit. There are some countermeasures to this phenomenon. One of those is site diversity. We evaluated quantitatively the effect when we carry out site diversity between two sites, using Japanese rainfall data measured every 1minutes. In this research, we used these data measured at 13 spots in the Kanto region of Japan. These data are accumulated over 8 years. We calculated rainfall intensity spatial correlation coefficient using the data. This correlation coefficient is represented as a function of distance. So this relation can be formulated. And effect of site diversity, diversity gain, is calculated using rainfall cumulative distribution made by these data and ITU attenuation prediction procedure. From this calculation, we found that the lower correlation coefficients becomes, the higher value of diversity gain is. So we made model formula to formulate relationship between spatial correlation coefficient and diversity gain. Since it becomes possible to know that how much distance apart between two earth stations, how large effect can be obtained in the Kanto area. We compared two diversity gain curves calculated by empirical formula in ITU and our model formula. As a result of this, when availabilities are 99% and 99.9%, these curves are quite similar. But it is quite different, when availability is 99.99%. So we should consider the validity of model formula about high availability by using data in the range of 20km or less.