Rain attenuation predictions on terrestrial radio links: differential equations approach

The results of rain attenuation on terrestrial microwave links in a tropical climate has been reported in this paper. The results are presented in the form of rate of change of attenuation with respect to rain rate, denoted by S. R%p/ .T his is in turn used for predicting the expected rain attenuation at any %p of the time rain rate is exceeded in any tropical location. The predictions of the proposed model have been validated using the data collected in six locations in Malaysia and experimental results reported in other tropical locations that have a similar rainfall regime. The Malaysian data consist of 1-year measured rain attenuation over six DIGI MINI-LINKs operating at 15 GHz, and rainfall rates measured with both 1-minute and 1-hour integration times at the respective locations. The validity of the proposed model is further validated by comparing its estimates with the method of ITU-R Radiocommunication Sector of ITU and two classical rain attenuation prediction models particularly developed for tropical regions.The test results have shown that the proposed method seems to be more accurate than the proposed method seems to be more accurate than ITU-R and the other two prediction models in Malaysia. The method could be used as an alternative approach for predicting rain attenuation over any terrestrial microwave links in Malaysia and similar tropical climates. Copyright © 2011 John Wiley & Sons, Ltd.

[1]  Tharek Abdul Rahman,et al.  Rain rate statistical conversion for the prediction of rain attenuation in Malaysia , 1999 .

[2]  L.D. Emiliani,et al.  One-Minute Rain-Rate Contour Maps for Microwave-Communication-System Planning in a Tropical Country: Nigeria , 2009, IEEE Antennas and Propagation Magazine.

[3]  John D. Kanellopoulos,et al.  Prediction of the outage performance of an orbital diversity earth-space system , 1991, Eur. Trans. Telecommun..

[4]  J. W. Goddard.  Propagation in rain and clouds , 2003 .

[5]  John Sunday Ojo,et al.  Rain Rate and Rain Attenuation Prediction for Satellite Communication in Ku and Ka Bands Over Nigeria. , 2008 .

[6]  Zhensen Wu,et al.  Analytic Specific Attenuation Model for Rain for Use in Prediction Methods , 2001 .

[7]  M. S. Pontes,et al.  Prediction of rain attenuation in terrestrial links using full rainfall rate distribution , 2007 .

[8]  G. Olalere Ajayi.  Some aspects of tropical rainfall and their effect on microwave propagation , 1990 .

[9]  Propagation data and prediction methods required for the design of terrestrial line-of-sight systems , 2001 .

[10]  F. Moupfouma.  Electromagnetic Waves Attenuation due to Rain: A Prediction Model for Terrestrial or L.O.S SHF and EHF Radio Communication Links , 2009 .

[11]  Spiros N. Livieratos,et al.  Availability and performance of single/multiple site diversity satellite systems under rain fades , 2001, Eur. Trans. Telecommun..

[12]  M. Pontes,et al.  Review of Rain Attenuation Studies in Tropical and Equatorial Regions in Brazil , 2005, 2005 5th International Conference on Information Communications & Signal Processing.

[13]  F. Moupfouma,et al.  Modelling of the rainfall rate cumulative distribution for the design of satellite and terrestrial communication systems , 1995 .

[14]  Emilio Matricciani.  Rain attenuation predicted with a two-layer rain model , 1991, Eur. Trans. Telecommun..

[15]  Tharek Abd Rahman,et al.  Empirically Derived Path Reduction Factor for Terrestrial Microwave Links Operating at 15 Ghz in Peninsula Malaysia , 2011 .