Space and time correlation of rain attenuation in millimetre wave feeder network

In the telecommunication industry the mobile operators often use connections in the microwave frequency bands. The application of these connections offers optimal solution because of easy installation and small equipment sizes. However, in addition to multipath fading, microwave links are also highly influenced by meteorological conditions, especially by rain. Because rain attenuation does not depend strongly on the station height, horizontal diversity is much more effective than vertical diversity. Intense rain showers that cause extreme attenuation occur in cells of small dimensions. Therefore the probability that two or more links have deep fade events at the same time is very small, and it strongly depends on the geometry of the network. In this contribution investigate the space and time correlation of the rain attenuation based on measured attenuation in millimetre wave links forming star topology. To develop efficient route diversity methods or site diversity strategies for cellular mobile systems deep knowledge of the spatial and time correlation statistic are essential. A.Daru Zs. Kormányos J. Bitó Pannon GSM Plc. Budapest University of Budapest University of Engineering department Department of Broadband Department of Broadband Baross G. utca 165. Goldmann György tér 3. Goldmann György tér 3. Budaörs, H-2040 Budapest, H-1111 Budapest, H-1111 Hungary Hungary Hungary Tel: +36-20-9302430 Tel: +36-30-2978641 Tel: +36-1-4633616 Fax: +36-1-4646424 Fax: +36-1-4633289 Fax: +36-1-4633289 E-m: [email protected] E-m: [email protected] E-m: [email protected] COST 280 2 PM3008 1 International Workshop A. Daru, Zs. Kormányos and J. Bitó July 2002