Optimal bandwidth allocation for multi-spot-beam satellite communication systems

Due to the scarceness of the on-board bandwidth resource in multi-spot-beam satellite communication systems, it is important to enhance the bandwidth utilization efficiency. To this end, in this paper, we propose solving the problem of bandwidth allocation. We first formulated the problem of bandwidth allocation as a convex optimization, taking account into a trade-off between the maximum system total capacity and fairness among spot beams. Then we used sub-gradient algorithm to search the Lagrange multiplier and obtained the optimal bandwidth allocation for each spot beam. Simulation results show that compared with the uniform or proportional bandwidth allocation algorithm, the proposed optimal bandwidth allocation algorithm improves the fairness among spot beams.