tailieunhanh - Báo cáo hóa học: " Research Article Penetration Loss Measurement and Modeling for HAP Mobile Systems in Urban Environment Jaroslav Holis and Pavel Pechac"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Penetration Loss Measurement and Modeling for HAP Mobile Systems in Urban Environment Jaroslav Holis and Pavel Pechac | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 543290 7 pages doi 2008 543290 Research Article Penetration Loss Measurement and Modeling for HAP Mobile Systems in Urban Environment Jaroslav Holisand Pavel Pechac Department of Electromagnetic Field Czech Technical University in Prague Technicka 2 Street 166 27 Praha 6 Czech Republic Correspondence should be addressed to Jaroslav Holis holisj1@ Received 1 October 2007 Accepted 2 April 2008 Recommended by Marina Mondin The aim of this paper is to present the results of a measurement campaign focused on the evaluation of penetration loss into buildings in an urban area as a function of the elevation angle. An empirical model to predict penetration loss into buildings is developed based on measured data obtained using a remote-controlled airship. The impact on penetration loss of different buildings and user positions within the buildings is presented. The measured data are evaluated as a function of the elevation angle. The measurement campaign was carried out at GHz and GHz carrier frequencies representing the frequency band for high altitude platform third-generation mobile systems and potentially next generation mobile systems mobile WiMAX for example the new penetration loss model can be used for system performance simulations and coverage planning. Copyright 2008 J. Holis and P. Pechac. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Urban areas are covered by a variety of mobile wireless systems. One disadvantage of these systems is that they are vulnerable to disasters either natural or manmade disasters such as terrorist attacks. To avoid this terrestrial networks could potentially be complemented with high altitude platforms HAPs situated in .

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