北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2001, Vol. 24 ›› Issue (3): 36-40.

• 学术论文 • 上一篇    下一篇

WCDMA系统中变步长功率控制策略

陈朝阳, 郗风君, 金香兰, 全庆一, 张 平   

  1. 北京邮电大学电信工程学院, 北京 100876
  • 收稿日期:2000-12-24 出版日期:2001-10-10
  • 作者简介: 陈朝阳(1968—),男,博士生.
  • 基金资助:
     

An Adaptive Step-Size Power Control Scheme in WCDMA

CHEN Chao-yang, XI Feng-jun, JIN Xiang-lan,QUAN Qing-yi, ZHANG Ping   

  1. Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, Chian
  • Received:2000-12-24 Online:2001-10-10
  • Supported by:
     

摘要: 提出了一种宽带码分多址接入系统闭环快速变步长的功率控制策略, 根据TPC命令的“历史”, 将功率控制过程划分为Markov状态. 分析了信道衰落步长的概率密度, 每一状态对应一个确定的步长值, 从而可以确定功率控制步长集中的步长数. 本文选用概率密度最大的数值, 同时考虑硬件可以分辨的最小步长约为0.5 dB, 以确定步长集. 用仿真的方法确定状态和步长的对应关系. 发射机依据当前的TPC命令决定应该增大还是减小发射功率, 依据当前TPC命令和“历史”上的TPC命令选择合适的功率步长, 进而确定发射功率.

关键词: WCDMA, 移动通信, 马尔可夫过程, 传输功率控制

Abstract: We propose and evaluate a single-bit adaptive step-size closed-loop power control (AS-CLPC) scheme that can be applied in WCDMA system.With respect to the step size of the transmitting power control,the proposed scheme chooses the set of step-size that have the maximum value of the probability density of the multipath Rayleigh channel fading step-size.The number of TPC step size that is applied by the new method is equal to the number of the channel Markov states.A method which shows how to acquire the Markov state is presented.Simulation which decides the relation between the states and the values of the step-size is introduced.

Key words: WCDMA, mobile radio, Markov process, transmitting power control

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