蜂窝移动通信系统中的平衡分布式功率控制算法

Balanced distributed power control for cellular radio systems

蜂窝移动通信系统中的功率控制是解决远 -近效应问题的主要手段 .为了克服现有功率控制算法的一些缺点 ,提出了平衡分布式控制算法 .该算法以载干比平衡为准则 ,在无需任何全局信息交换的条件下 ,既可以减少也可以增加发射功率 ,使发射功率保持在发射机的动态范围内 。

Power control is the key technology to solve the near-far problem in cellular radio systems. Because that the capacity increases while co-channel interference decreases in code division multiple access (CDMA) system. Power control algorithms can be cataloged into centralized and distributed ones. Centralized power control algorithms can arrive at the global solution, where it needs channel gain between any pair of nodes. Distributed power control algorithms are used in practical system instead of centralized algorithms. Then distributed algorithms must converge to the optimal solution as fast as possible. A distributed power control algorithm named FDPC (fully distributed power control) is proposed by Lee. FDPC had solved the global information change problem, but a new problem is that the transmitting power decreases as low as possible. Balanced distributed power control (BDPC) algorithm is proposed. Compared with DPC (distributed power control) and FDPC, BDPC does not need the normalization procedure, at the meantime BDPC can prevent transmitting powers from falling out of desired range. The simulation results show that BDPC can converge to the optimal solution quickly.