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Orthogonal Code Sharing and Radio Resource Allocation in Multibeam Satellite Communication Systems  

Lim, Kwang-Jae (한국전자통신연구원 전파방송연구소)
Kim, Soo-Young (한국전자통신연구원 전파방송연구소)
Oh, Deok-Gil (한국전자통신연구원 전파방송연구소)
Kim, Jae-Moung (인하대학교 정보통신대학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.3A, 2003 , pp. 140-150 More about this Journal
Abstract
In this paper, we propose a novel code sharing method for downlink transmission of mobile satellite communication systems using a multibeam geosynchronous-orbit satellite. In the proposed system, spreading codes are shared among downlink beams in order to increase the system capacity. We also propose efficient radio resource and transmit power allocation schemes for the proposed system. Simplified analysis and simulation results on the system capacity show the capacity improvement by the proposed scheme. The simulation results show that the capacity of the proposed system is more than 2 times as large as that of a conventional multibeam satellite system. In the frequency-selective fading channel, the capacity improvement increases as the interference between orthogonal spreading codes decrease.
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