TAILIEUCHUNG - Báo cáo hóa học: " Research Article WCDMA Uplink Interference Assessment from Multiple High Altitude Platform Configurations"

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 WCDMA Uplink Interference Assessment from Multiple High Altitude Platform Configurations | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 182042 7 pages doi 2008 182042 Research Article WCDMA Uplink Interference Assessment from Multiple High Altitude Platform Configurations T. Hult 1 D. Grace 2 and A. Mohammed1 1 Department of Signal Processing Blekinge Institute of Technology 372 25 Ronneby Sweden 2 Department of Electronics University of York York YO10 5DD UK Correspondence should be addressed to T. Hult Received 2 November 2007 Accepted 13 May 2008 Recommended by Marina Mondin We investigate the possibility of multiple high altitude platform HAP coverage of a common cell area using a wideband code division multiple access WCDMA system. In particular we study the uplink system performance of the system. The results show that depending on the traffic demand and the type of service used there is a possibility of deploying 3-6 HAPs covering the same cell area. The results also show the effect of cell radius on performance and the position of the multiple HAP base stations which give the worst performance. Copyright 2008 T. Hult et al. 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 Third-generation mobile systems are gradually being deployed in many developed countries in hotspot areas. However owing to the amount of new infrastructures required it will still be some time before 3G is ubiquitous especially in developing countries. One possible cost effective solution for deployments in these areas is to use high altitude platforms HAPs 1-9 for delivering 3G WCDMA communications services over a wide coverage area 1014 . HAPs are either airships or planes that will operate in the stratosphere 17-22 km above the ground. This unique position offers a significant link budget advantage compared .

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