Title :
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
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;
Conference_Titel :
Communications, 1989. ICC '89, BOSTONICC/89. Conference record. 'World Prosperity Through Communications', IEEE International Conference on
Conference_Location :
Boston, MA
DOI :
10.1109/ICC.1989.49699
