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Cognitive beamhopping for spectral coexistence of multibeam satellites
Author(s) -
Sharma Shree Krishna,
Chatzinotas Symeon,
Ottersten Björn
Publication year - 2014
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.1073
Subject(s) - computer science , interference (communication) , satellite system , cognitive radio , constraint (computer aided design) , spectral efficiency , satellite , reuse , default gateway , throughput , radius , primary (astronomy) , telecommunications , computer network , physics , global positioning system , mathematics , engineering , beamforming , channel (broadcasting) , geometry , gnss applications , astronomy , wireless , waste management
SUMMARY Herein, the spectral coexistence scenario of two multibeam satellites over a common coverage area is studied where a primary satellite produces larger beams while a secondary satellite has smaller beams. A novel cognitive beamhopping satellite system is proposed assuming that the secondary gateway is aware of the primary's beamhopping pattern. The performance of the proposed system is evaluated and compared with that of conventional multibeam and beamhopping systems in terms of throughput. It is shown that the proposed system significantly enhances the spectral efficiency (SE) in comparison to other systems. Furthermore, a power control technique is applied on the secondary transmission in order to adhere to the primary's interference constraint. It is noted that the total SE increases with the number of secondary users in the full frequency reuse approach. Moreover, the exclusion zone (EZ) principle is applied to exploit the regions in which the secondary system can operate without causing harmful interference to the primary system. It is shown that the EZ radius of 8.5 dB is sufficient to protect the primary system perfectly with a significant gain in SE. Finally, it is shown that power control and the EZ methods are suitable for lower and higher values of secondary aggregated interference, respectively. Copyright © 2014 John Wiley & Sons, Ltd.