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对于功率受限的卫星通信系统,提升功率利用效率显得尤为重要。文章分析了端到端的卫星链路性能和转发器增益对系统容量的影响,建立了联合转发器增益设置和功率分配的最大化系统信道容量的资源分配模型。在对模型深入分析的基础上,提出了功率分配与转发器增益设置联合优化算法。结合对偶理论和最速下降算法,解决了目标函数对于转发器增益为非凸函数这一难题。仿真结果表明,文中设计的算法可以得到使系统信道容量全局最优的转发器增益值和功率分配结果。
For power-constrained satellite communication systems, it is particularly important to improve power utilization efficiency. The article analyzes the influence of end-to-end satellite link performance and transponder gain on the system capacity, and establishes the resource allocation model of maximizing the system channel capacity of the joint transponder gain setting and power allocation. Based on the in-depth analysis of the model, a joint optimization algorithm of power allocation and transponder gain setting is proposed. Combining the duality theory and the steepest descent algorithm, the problem that the objective function has a non-convex function for the transponder gain is solved. The simulation results show that the algorithm designed in this paper can obtain the gain and power allocation results of the transponder with the best global channel capacity.