CAJ | 학술논문

在多波束卫星通信系统中，资源利用率受星上能量的限制，提高资源的利用率非常重要。为提高星上资源分配的灵活性，提出了一种在波束间干扰条件下基于不同业务需求和信道条件的多波束卫星下行链路功率带宽联合优化算法。该联合优化算法采用二阶差分目标函数，采用拉格朗日对偶理论和次梯度法获得该联合优化问题最优解的下界。仿真结果表明，与单独优化功率和带宽算法相比，该功率带宽联合优化算法可以根据不同的业务需求和信道条件更加灵活地分配系统资源，提高了资源利用率。
재다파속위성통신계통중，자원이용솔수성상능량적한제，제고자원적이용솔비상중요。위제고성상자원분배적령활성，제출료일충재파속간간우조건하기우불동업무수구화신도조건적다파속위성하행련로공솔대관연합우화산법。해연합우화산법채용이계차분목표함수，채용랍격랑일대우이론화차제도법획득해연합우화문제최우해적하계。방진결과표명，여단독우화공솔화대관산법상비，해공솔대관연합우화산법가이근거불동적업무수구화신도조건경가령활지분배계통자원，제고료자원이용솔。
In the multi-spot-beam satellite communication system,the utilization efficiency of resources is constrained by on-board energy.It is important to improve the efficiency of resources.Taking inter-beam interference of each beam into account,a joint power and bandwidth allocation algorithm based on different traffic demands and channel conditions over satellite downlinks is proposed,which increases the flexibility of the multi-spot-beam resource optimization.The algorithm adopts a two order differential object function and obtains a lower bound of the optimal power and bandwidth with Lagrangian duality theory and sub-gradient method.The simulation results show,compared with separate power and bandwidth optimi-zation algorithm,the joint optimization algorithm can allocate system resource more flexible and satisfy different traffic de-mands and channel conditions.So it improves on-board resource utilization efficiency.