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在多波束卫星通信系统中,星上的资源(功率和带宽等)是有限的。提高资源的利用率显得至关重要。针对现有的多波束卫星通信系统各个点波束下行功率分配采用固定的等功率分配方式与实际中不断变化的业务需求不相匹配,未能充分地利用有限的功率资源。通过构建多波束卫星通信系统下行点波束容量模型,提出了一种基于业务需求的有效功率分配算法,利用拉格朗日对偶理论和次梯度法解决了该功率分配问题。仿真结果分析表明,该有效的功率分配算法可以获得灵活的系统可用容量,可以满足不同的业务需求,能够有效地利用有限的功率资源,提高了资源的利用率。
In multi-beam satellite communications systems, the resources on the star (power and bandwidth, etc.) are limited. To improve the utilization of resources is crucial. In view of the fact that the fixed equal-power allocation mode of each spot beam downlink power allocation in the existing multi-beam satellite communication system does not match the changing service requirements in practice, the limited power resources can not be fully utilized. By constructing a downlink beamforming capacity model of multi-beam satellite communication system, an efficient power allocation algorithm based on service requirements is proposed. The power distribution problem is solved by Lagrange’s duality and sub-gradient methods. The simulation results show that the effective power allocation algorithm can obtain flexible system capacity, which can meet different business needs, effectively utilize limited power resources and improve resource utilization.