中国邮电高校学报(英文) ›› 2010, Vol. 17 ›› Issue (6): 1-10.doi: 10.1016/S1005-8885(09)60518-5

• Wireless •    下一篇

Digital and analog hybrid control in adaptive interference cancellation system

蒋云昊   

  1. College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • 收稿日期:2010-04-19 修回日期:2010-09-13 出版日期:2010-12-30 发布日期:2010-12-06
  • 通讯作者: 蒋云昊 E-mail:jyh6858@126.com
  • 基金资助:

    国家自然科学基金创新研究群体基金

Digital and analog hybrid control in adaptive interference cancellation system

jiang yunhao   

  1. College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2010-04-19 Revised:2010-09-13 Online:2010-12-30 Published:2010-12-06
  • Contact: jiang yunhao E-mail:jyh6858@126.com
  • Supported by:

    National Natural Science Foundation of China

摘要:

The digital proportion control is introduced to improve the performance of the analog adaptive interference cancellation system (ICS). For the high frequency parts of the signals after multiplier are not required, the sampling frequency need not satisfy the sampling theorem for high frequency. Because the sampling, calculation and output expend time in digital control, the ideal condition, delay condition and delay-wait condition are taken into account. Through analyzing the system model with three conditions, we gain the stable conditions of the system, the optimization step factors that can make the system converge fastest and the formulas of the interference cancellation ratios (ICRs). One step convergence can be accomplished under ideal condition, whereas the system can not converge in one step under delay condition and delay-wait condition. The calculation results show the convergence speed of delay-wait condition is slower than that of delay condition. The ICR is improved with the increase of the step factor which is in stable bound, but the convergence speed is decreased if the step factor exceeds the optimization step factor. In order to avoid that confine, the method of amending the steady state weight to improve the ICR is proposed. The analyses are in agreement with the computer simulations

关键词:

digital and analog hybrid control, adaptive interference cancellation, weight, ICR, convergence speed

Abstract:

The digital proportion control is introduced to improve the performance of the analog adaptive interference cancellation system (ICS). For the high frequency parts of the signals after multiplier are not required, the sampling frequency need not satisfy the sampling theorem for high frequency. Because the sampling, calculation and output expend time in digital control, the ideal condition, delay condition and delay-wait condition are taken into account. Through analyzing the system model with three conditions, we gain the stable conditions of the system, the optimization step factors that can make the system converge fastest and the formulas of the interference cancellation ratios (ICRs). One step convergence can be accomplished under ideal condition, whereas the system can not converge in one step under delay condition and delay-wait condition. The calculation results show the convergence speed of delay-wait condition is slower than that of delay condition. The ICR is improved with the increase of the step factor which is in stable bound, but the convergence speed is decreased if the step factor exceeds the optimization step factor. In order to avoid that confine, the method of amending the steady state weight to improve the ICR is proposed. The analyses are in agreement with the computer simulations

Key words:

digital and analog hybrid control, adaptive interference cancellation, weight, ICR, convergence speed