Multi-spot-beam technique has been widely applied in modern satellite communication systems. However, the satellite power\r\nand bandwidth resources in a multi-spot-beam satellite communication system are scarce and expensive; it is urgent to utilize\r\nthe resources efficiently. To this end, dynamically allocating the power and bandwidth is an available way. This paper initially\r\nformulates the problem of resource joint allocation as a convex optimization problem, taking into account a compromise between\r\nthe maximum total system capacity and the fairness among the spot beams. A joint bandwidth and power allocation iterative\r\nalgorithm based on duality theory is then proposed to obtain the optimal solution of this optimization problem. Compared with the\r\nexisting separate bandwidth or power optimal allocation algorithms, it is shown that the joint allocation algorithm improves both\r\nthe total system capacity and the fairness among spot beams.Moreover, it is easy to be implemented in practice, as the computational\r\ncomplexity of the proposed algorithm is linear with the number of spot beams.
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