摘要
针对码分多址(CDMA)卫星通信系统吞吐量受限于卫星转发器的饱和通量密度(SFD)的特点,提出了在此约束下最大化系统吞吐量的非线性规划功率控制模型,利用原始—对偶方法求解,通过地球站之间有限的信息交互,实现了一种分布式的功率控制算法。仿真结果表明,该算法能较快收敛且接收天线的功率通量密度有效收敛于饱和通量密度,相对于传统的分布式功率控制(DPC)算法,能有效提高系统的吞吐量。
Concering the characteristic that the throughput of satellite communication system is constrained by the Saturation Flux Density （ SFD） of satellite transponder, the power control problem was formalized as a nonlinear optimization problem. A Distributed Power Control （ DPC） algorithm was proposed to maximize the system utility under the limits of SFD using primal-dual method with limited information exchange among earth stations. The simulation results show that the proposed algorithm converges fast and the power flux density at the receiving antenna is appropriate to the SFD. Furthermore, the throughput of the system is dramatically enhanced.
出处
《计算机应用》
CSCD
北大核心
2010年第9期2512-2514,2518,共4页
journal of Computer Applications
关键词
卫星通信
功率控制
饱和通量密度
吞吐量
satellite communication
power control
Saturation Flux Density （ SFD）
throughput
