Grace, D., Chen, G.H., White, G.P., Tozer, T.C. and Thornton, J. (2005) Improving the system capacity of broadband services using multiple high-altitude platforms. IEEE Transactions on Wireless Communications. pp. 700-709. ISSN 1536-1276Full text available as:
A method of significantly improving the capacity of high-altitude platform (HAP) communications networks operating in the millimeter-wave bands is presented. It is shown how constellations of HAPs can share a common frequency allocation by exploiting the directionality of the user antenna. The system capacity of such constellations is critically affected by the minimum angular separation of the HAPs and the sidelobe level of the user antenna. For typical antenna beamwidths of approximately 5/spl deg/ an inter-HAP spacing of 4 km is sufficient to deliver optimum performance. The aggregate bandwidth efficiency is evaluated, both theoretically using the Shannon equation, and using practical modulation and coding schemes, for multiple HAP configurations delivering either single or multiple cells. For the user antenna beamwidths used, it is shown that capacity increases are commensurate with the increase in the number of platforms, up to 10 HAPs. For increases beyond this the choice of constellation strategy becomes increasingly important.
|Copyright, Publisher and Additional Information:||Copyright © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.|
|Academic Units:||The University of York > Electronics (York)|
|Depositing User:||Sherpa Assistant|
|Date Deposited:||15 Dec 2006|
|Last Modified:||19 Feb 2013 11:49|
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