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  • Research Article
  • Open Access

Downlink Coexistence Performance Assessment and Techniques for WiMAX Services from High Altitude Platform and Terrestrial Deployments

EURASIP Journal on Wireless Communications and Networking20082008:291450

  • Received: 1 November 2007
  • Accepted: 6 August 2008
  • Published:


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.


  • Performance Assessment
  • Full Article
  • Directive Antenna
  • Terrestrial System
  • Publisher Note

Publisher note

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Authors’ Affiliations

Department of Signal Processing, Blekinge Institute of Technology (BTH), 372 35 Ronneby, Sweden
Department of Electronics, University of York, York, YO10 5DD, UK


© Z. Yang et al. 2008

This article is published under license to BioMed Central Ltd. 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.