星间通信中带宽和功率联合分配算法

Joint bandwidth and power allocation algorithm in inter-satellite communication

针对星间通信链路的资源分配与现实中业务需求和信道条件不能匹配,导致有限的星上资源不能得到充分利用的情况,本文通过构建星间通信系统容量模型,提出了一种星间通信中带宽和功率协调分配算法。算法根据不同链路具有不同信道条件和业务需求,采用拉格朗日对偶理论和次梯度法,通过对功率和带宽的二次迭代,最终的到功率和带宽的最优解。仿真结果表明本算法能够有效地为不同链路分配合理的带宽和功率资源,使系统总容量得到明显的增加,并对系统资源利用率进行显著的提高。

For the inter-satellite communication,the conventiaonal resource allocation does not match the requirement of practical services and the variation of channel conditions,which consequently cannot make full use of limited satellite resource.Nowadays,small satellite formation flying system attracts more attention to its great advantages mainly in reliability,cost,performance,and becomes a promising technology in the field of international aerospace.Inter-satellite communication bears the mission of information interaction between two small satellites,the small satellite and relay satellite,the relay satellite and the earth synchronous satellite.Since the power and bandwidth in satellite communication is limited,it is of great significants to improve the utilization of such resources.In this paper,by constructing satellite communication system capacity model,ajoint communication bandwidth and power allocation algorithm is proposed under different channel conditions and service requirement with respect to different communication link.Then,the Lagrangian duality theory and the subgradient method is adopted mathematically.With the iteration of the power and bandwidth,respectively,the optimal power and bandwidth can ultimately be achieved.Simulation results indicate that the proposed algorithm can allocate the bandwidth and power resource efficiently,increase the system capacity,and improve the utilization of resources.