Abstract: A new power control algorithm in CDMA system is proposed in this paper, based on the analysis of the traditional algorithm's shortcoming, the parameters optimization in the fuzzy control system are considered. The simulation results show that the control precision can be improved by 0.6-1.1dB with 3-path diversity and 5 fuzzy sets distribution. The performance of the proposed algorithm under different limited word length condition are also analyzed.

Key words: Fuzzy logic, power control, CDMA

摘要： 在分析传统的固定步长功率控制算法性能的基础上，提出了一种采用模糊技术进行CDMA功率控制系统设计的方案，并对比了不同模糊集合划分情况下的性能以及模糊参数的优选方法。指出在分集路径数目为3的情况下，采用5模糊集划分的控制系统比传统算法的精度提高了0.6～1.1dB。此外，还讨论了在控制量字长受限的情况下，对控制性能的影响。

关键词: 模糊逻辑, 功率控制, 码分多址