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Spectrum etiquettes for terrestrial and high-altitude platform-based cognitive radio systems

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3 Author(s)
Likitthanasate, P. ; Commun. Res. Group, York Univ., York ; Grace, D. ; Mitchell, P.D.

Two spectrum etiquettes are developed for the use on the downlink of coexisting high-altitude platform (HAP) and terrestrial fixed broadband systems that are intended for future application with cognitive radio-based user terminals with directional antennas. The spectrum etiquettes are based on the interference to noise ratio and carrier to interference plus noise ratio levels at the receiver of an incumbent user. Antenna beamwidths and multiple modulation scheme levels determine the parameter settings for coexistence performance. It is shown that coexistence performance can be improved by exploiting the surplus transmitter power of the terrestrial system, thereby enabling the incumbent terrestrial system to accommodate additional interference arising from a newly activated HAP system.

Published in:

Communications, IET  (Volume:2 ,  Issue: 6 )

Date of Publication:

July 2008

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