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Journal of Applied Mathematics
Volume 2014 (2014), Article ID 469437, 8 pages
Research Article

Optimization of Power Allocation for a Multibeam Satellite Communication System with Interbeam Interference

College of Communications Engineering, PLA University of Science and Technology, No. 2 , Yudao Street, Nanjing 210007, China

Received 22 October 2013; Accepted 24 December 2013; Published 16 January 2014

Academic Editor: Hanan Luss

Copyright © 2014 Heng Wang et al. 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.


In multibeam satellite communication systems it is important to improve the utilization efficiency of the power resources, due to the scarcity of satellite power resources. The interbeam interference between the beams must be considered in the power allocation; therefore, it is important to optimize the power allocated to each beam in order to improve the total system performance. Initially the power allocation problem is formulated as a nonlinear optimization, considering a compromise between the maximization of total system capacity and the fairness of the power allocation amongst the beams. A dynamic power allocation algorithm based on duality theory is then proposed to obtain a locally optimal solution for the optimization problem. Compared with traditional power allocation algorithms, this proposed dynamic power allocation algorithm improves the fairness of the power allocation amongst the beams, and, in addition, the proposed algorithm also increases the total system capacity in certain scenarios.