An approach to LSI implementation of a 2B1Q coded echo canceler for ISDN subscriber loop transmission

Author

Fukuda, M. ; Ohta, S. ; Yamaguchi, K. ; Tsuda, T. ; Gotohda, T. ; Gambe, H. ; Miyoshi, S. ; Awata, Y.

Author_Institution

Fujitsu Ltd., Kawasaki, Japan

fYear

1989

Firstpage

233

Abstract

An approach to large scale integration (LSI) implementation of the 2B1Q echo canceler for an integrated services digital network (ISDN) basic access interface is described. A hybrid architecture, using both analog and digital processing, is adopted for LSI implementation with a moderate circuit scale. Techniques using baud-rate sampling, such as √f automatic gain control (AGC) equalization by power detection, timing extraction by peak estimation and a two-stage echo canceler with divided tables, are introduced to the system. Performance characteristics are also confirmed by computer simulation and a prototype system

Keywords

ISDN; echo suppression; large scale integration; subscriber loops; 2B1Q coded echo canceller; AGC; ISDN; LSI; analog signal processing; automatic gain control; basic access interface; baud-rate sampling; computer simulation; digital processing; divided tables; equalization; hybrid architecture; integrated services digital network; large scale integration; peak estimation; power detection; prototype system; subscriber loop transmission; timing extraction; two-stage echo canceler; Ambient intelligence; Circuits; DSL; ISDN; Large scale integration; Sampling methods; Standardization; Subscriber loops; Timing; Transceivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1989. ICC '89, BOSTONICC/89. Conference record. 'World Prosperity Through Communications', IEEE International Conference on

Conference_Location

Boston, MA

Type

conf

DOI

10.1109/ICC.1989.49699

Filename

49699