北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2007, Vol. 30 ›› Issue (3): 96-99.doi: 10.13190/jbupt.200703.96.zhaol

• 研究报告 • 上一篇    下一篇

CDMA系统中改进的功率控制算法研究

赵琳, 刘剑飞, 于晓然, 王现彬   

  1. 河北工业大学 信息工程学院, 天津 300401
  • 收稿日期:2006-06-27 修回日期:2006-10-10 出版日期:2007-06-30 发布日期:2007-06-30
  • 通讯作者: 赵琳

An Adaptive Power Control Algorithm in CDMA Systems

ZHAO Lin, LIU Jian-fei, YU Xiao-ran , WANG Xian-bin   

  1. School of Information Engineering, Hebei University of Technology, Tianjin 300401, China
  • Received:2006-06-27 Revised:2006-10-10 Online:2007-06-30 Published:2007-06-30
  • Contact: ZHAO Lin

摘要:

提出了一种CDMA系统中改进的自适应功率控制算法.新算法基于信噪比测量,采用卡尔曼滤波器估计信道衰落,采用记忆单元记录功率控制调整指令历史,并综合利用两方面的信息来决定下一次的功率调整步长。该算法在一定程度上可以有效克服信道中深度衰落和快衰落带来的影响,并改善CDMA系统的性能.

关键词: TD-SCDMA, 功率控制, 卡尔曼滤波器, 记忆单元

Abstract:

An improved adaptive power control algorithm in CDMA systems is presented in this paper. The proposed algorithm is based on SIR-measurement method. The step-size of variable power is decided according to both channel fading characteristics estimated by a Kalman filter and the previous power control instructions recorded by a memory unit. The simulation results demonstrate that the proposed algorithm will be able to overcome the fast and deep fading and improve the performance of CDMA systems.

Key words: TD-SCDMA, power control, kalman filtering, memory unit

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