Downlink coexistence performance assessment and techniques for WiMax services from high altitude platform and terrestrial deployments

Authors:
Z. Yang;A. Mohammed;T. Hult;D. Grace
Affiliations:
Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden;Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden;Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden;Department of Electronics, University of York, York, UK
Venue:
EURASIP Journal on Wireless Communications and Networking - Advanced Communication Techniques and Applications for High-Altitude Platforms
Year:
2008

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Abstract

We investigate the performance and coexistence techniques for worldwide interoperability for microwave access (WiMAX) delivered from high altitude platforms (HAPs) and terrestrial systems in shared 3.5 GHz frequency bands. The paper shows that it is possible to provide WiMAX services from individual HAP systems. The coexistence performance is evaluated by appropriate choice of parameters, which include the HAP deployment spacing radius, directive antenna beamwidths based on adopted antenna models for HAPs and receivers. Illustrations and comparisons of coexistence techniques, for example, varying the antenna pointing offset, transmitting and receiving antenna beamwidth, demonstrate efficient ways to enhance the HAP system performance while effectively coexisting with terrestrial WiMAX systems.