新加坡南洋理工大学YU Yajun博士将于2009年6月16日访问我校，并于6月16日上午9：30在玉泉行政楼208室做学术报告。报告题目，简要，及演讲者简介如下，欢迎大家参加。

Design of Linear Phase FIR Filters in Subexpression Spaces

Abstract: Multiplierless filtering is very attractive for low computational complexity and low power consumption design. The most advanced techniques in the design of multiplierless FIR filters explore the common subexpression sharing in the implementation of filter coefficients. Traditional techniques of the common subexpression sharing are constrained by a lower bound on the number of adders require for a given filter specification.

In this talk, two techniques are presented to reduce the lower bound such that the filter complexity is reduced. First, a concept of subexpresion space is introduced. An algorithm to optimize the filter coefficients directly in subexpression spaces is proposed. Secondly, the lower bound could also be reduced by a novel filter structure. A residue compensation extrapolated filter structure is presented to synthesize the filter coefficients with reduced complexity. Numerical examples of benchmark filters show that the required number of adders obtained using the proposed techniques are much less than those obtained using traditional approaches.

Biography: Yu Yajun received both the B.Sc. and M.Eng. degrees in Biomedical Engineering from Zhejiang University, Hangzhou, China, in 1994 and 1997, respectively, and the Ph.D. degree in Electrical and Computer Engineering from the National University of Singapore, Singapore, in 2004.

From 1997 to 1998, she was a Teaching Assistant with Zhejiang University. From 1998 to 2004, she was a research engineer with the Department of Electrical and Computer Engineering, National University of Singapore. In 2002, she was a Visiting Researcher at the Tampere University of Technology, Tampere, Finland and the Hong Kong Polytechnic University, Hong Kong, China. She joined the Temasek Laboratories at Nanyang Technological University as a Research Fellow in 2004. Since 2005, she has been with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, where she is currently an Assistant Professor. Her research interests include digital signal processing and VLSI circuits and systems design.

Dr. Yu is a senior member of IEEE. She serves as an Associate Editor for the journal of Circuits Systems and Signal Processing (CSSP) (2009 � now), and Guest Editor of the journal of CSSP for the Special Issue in 2009.