Title :
A novel method for periodic interference suppression on local telephone loops
Author :
Keratiotis, George ; Lind, Larry ; Cook, John W. ; Patel, Minesh ; Whelan, Pete ; Croft, Dave ; Hughes, Pete
Author_Institution :
Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK
fDate :
7/1/2000 12:00:00 AM
Abstract :
An efficient method for real-time periodic interference suppression on telephone lines is proposed. The periodicity of the interference Is exploited by an adaptive phase-locked buffer (APLB), which is used to create the antiphase noise replica. Computer simulations are used to compare the APLB approach with the traditional least mean squares (LMS) algorithm in an adaptive noise cancellation configuration. The new technique outperforms the LMS noise canceller and proves to be a very efficient solution to the power line interference problem
Keywords :
adaptive signal processing; digital phase locked loops; interference suppression; subscriber loops; synchronisation; telephone interference; twisted pair cables; APLB noise canceller; adaptive noise cancellation configuration; adaptive phase-locked buffer; antiphase noise replica; digital PLL; local telephone loops; periodic interference suppression; power line interference problem; real-time interference suppression; telephone lines; Adaptive algorithm; Delta modulation; Finite impulse response filter; Frequency; Interference suppression; Least squares approximation; Noise cancellation; Phase noise; Telephony; Voltage;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
