A low complexity adaptive interpolated FIR echo canceller

Author

Lin, Shou-Sheti ; Wu, Wen-Rong

Author_Institution

Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

4

fYear

2001

fDate

6-9 May 2001

Firstpage

438

Abstract

A novel composite FIR-based filter structure is proposed to reduce the complexity of echo cancellers. The proposed filter consists of an FIR filter, an interpolated FIR (IFIR) filter, and a tap-weight overlapping method. The FIR filter is used to model the short rapidly changing head echo portion while IFIR filter is for the long slowly decaying tail echo. About 55% complexity reduction is obtained compared to a conventional transversal filter while this design inherits stable convergence advantages. Simulation results show that an average 75.1 dB ERLE performance is achieved for the 2320-kbps SDSL system

Keywords

FIR filters; adaptive filters; digital filters; digital subscriber lines; echo suppression; interpolation; 2320 kbit/s; ERLE performance; IFIR; SDSL system; adaptive interpolated FIR echo canceller; complexity; composite FIR-based filter structure; head echo portion; interpolated FIR; tail echo; tap-weight overlapping method; transversal filter; Adaptive filters; Circuits; Echo cancellers; Filtering; Finite impulse response filter; IIR filters; Probability distribution; Propagation losses; Subscriber loops; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on

Conference_Location

Sydney, NSW

Print_ISBN

0-7803-6685-9

Type

conf

DOI

10.1109/ISCAS.2001.922267

Filename

922267