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Piloted Adaptive Notch Filter
Date: 2017/7/3             Browse: 235
Speaker:   Prof. Lim Yong Ching
Time:        July 3,10:30 am-11:30 am.

Location:  Room 1A-200  , SIST Building

Inviter:   Prof. Xin Lou


Abstract:

In the implementation of an adaptive notch filter using the least mean squares (LMS) algorithm, the zero of the filter is steered toward the input sinusoid based on the gradient information. The convergent may be speeded up if a larger step size is used when the zero of the notch filter is far away from the frequency of the input sinusoid. Conventional variable step-size algorithms determine the step size based on a weighted average of the gradient estimates at several sampling instances. It suffers from the problem that there is a lack of reliable information on the distance between the zero and the frequency of the sinusoid.

    In this talk, we present a new piloted method for extracting information on the distance between the frequency of the input sinusoid and the zero of the notch. It uses three (or more) notches, namely, a main notch and two (or more) pilot notches implemented with minimal additional cost. The pilot notches are used to analyze the gradient estimates at the same sampling instance but at several frequency points as the main notch. Simulation results show that the piloted notch technique is significantly superior to step-size determination based on gradient estimates at several sampling instances. The piloted method can be used in conjunction with most existing algorithms to determine the step size.

Bio:

Awards:

(1)2000: Fellow of IEEE

(2)1996: IEEE Circuits and Systems Society Guillemin-Cauer Best Paper Award for paper in IEEE     Transactions on Circuits and Systems Parts I and II.

(3)1990: IREE (Australia) Norman Hayes Memorial Best Paper Award.

(4)1977: IEE Award for Final Year Rank #1 Student in EE Department, Imperial College, London.

Education:

(1)1980: PhD, University of London (Imperial College).

(2)1980: DIC, Imperial College, London.

(3)1977: B.Sc., University of London (Imperial College).

(4)1977: ACGI, City & Guilds of London Institute, Imperial College, London.

Occupation:

(1)2003-Present: Professor, School of EEE, Nanyang Technological University.

(2)1982-2003: Lecturer, Senior Lecturer, Associate Professor, Professor, ECE Department, National University of Singapore.

(3)1980-1982: Research Associate, Naval Postgraduate School, Department of US Navy.

                                                                                                                  SIST-Seminar 17029