CDMA2000中的功率控制及容量仿真

Power Control and Capacity Simulation in CDMA2000 System

在码分多址(CD M A)系统中,在不影响通话质量的前提下,要使得系统容量最大化需要采用功率控制技术。功率控制的主要方法是通过降低每个移动台和基站的发射功率使得系统中干扰最小化。在建立模型的基础上,文章分别对单小区和多小区CD M A系统的系统容量进行了理论推导,并采用19个小区的仿真模型对系统容量进行了仿真。在将仿真得出的结果与理论推导值比较后,得出结论功率控制的偏差直接导致系统容量的下降,因此研究出更好的功率控制算法对于提高系统容量至关重要。

In a CDMA system, power control technology can be used to maximum the system capacity while not affecting the quality of call. The main method to control power is to reduce the transmit power of each mobile station and base station in order to minimum the system interference. By establishing system models, the capacities of single-cell and multiple-cell CDMA systems are theoretically calculated and compared with the simulation results from a 19-cell simulation model. It shows that the deviation of power control may directly bring on the decrease of system capacity and a better power control algorithm is crucial to system capacity enhancement.