標題: Adaptive fuzzy proportional integral power control for a cellular CDMA system with time delay
作者: Chang, PR
Wang, BC
交大名義發表
電信工程研究所
National Chiao Tung University
Institute of Communications Engineering
公開日期: 1-十二月-1996
摘要: In this article, we investigate the use of fuzzy logic control techniques for adaptive power control in a direct-sequence code-division multiple-access (DS/CDMA) cellular system over the mobile fading radio channels with propagation time delay, A fuzzy PI (proportional-plus-integral) control whose input variables are the received power error and error change is introduced to determine each user transmitting power in order to simultaneously equalize all users' signal powers received at the base station and achieve better System stability and control performance, This control strategy can ensure long loop transmission delays without causing the system to become unstable, According to the well-known phase-plane method, the derivation of the fuzzy PI control has been carried out by analyzing the response areas, cross-over, and extreme points of the system step response with apriori knowledge of the dynamics of the CDMA mobile fading channels, For a long time-delay fading process, a methodology is developed to modify the rule base to contain the delay information for reducing the deadtime effects of the process, Moreover, the additional advantages of fuzzy PI control over conventional control theories are: increased robustness in spite of interference and the ability to handle the time-delay process whose parameters are not accurately known, Simulation results show that a good performance can he achieved both in rms tracking error and traffic capacity by use of fuzzy PI power control, especially in poor interuser interference and long time delay conditions.
URI: http://dx.doi.org/10.1109/49.545704
http://hdl.handle.net/11536/893
ISSN: 0733-8716
DOI: 10.1109/49.545704
期刊: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume: 14
Issue: 9
起始頁: 1818
結束頁: 1829
顯示於類別:期刊論文


文件中的檔案:

  1. A1996VX46200015.pdf