Reduced complexity echo cancellation using orthonormal functions
- 1 January 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems
- Vol. 38 (1) , 20-28
- https://doi.org/10.1109/31.101300
Abstract
Top reduce the echo canceler complexity associated with the cancellations of subscriber loop echo responses with long tails, a two-stage digital echo canceler, in which the second stage is an adaptively weighted combination of orthonormal IIR responses is proposed and investigated. Satisfactory performance (70-dB cancellation) was found for a variety of loops at 80 and 320 kB symbol rates with 15 such IIR responses, based on a Laguerre functions. The first echo canceler stage is a conventional transversal filter with 20-40 tap coefficients. Substantial complexity reduction was achieved by the new structure. Adaptation convergence was also analyzed and simulated.Keywords
This publication has 7 references indexed in Scilit:
- Design techniques and performance of an LSI-based 2B1Q transceiverPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Study of a pole - zero adaptive echo cancellerIEEE Transactions on Circuits and Systems, 1987
- Echo Cancellation in Speech and Data TransmissionIEEE Journal on Selected Areas in Communications, 1984
- Analogue adaptive hybrid for digital transmission on subscriber linesIEE Proceedings F Communications, Radar and Signal Processing, 1984
- Adaptive Reference Echo CancellationIEEE Transactions on Communications, 1982
- Implementation of an Adaptive Balancing HybridIEEE Transactions on Communications, 1980
- On the Independence Theory of Equalizer ConvergenceBell System Technical Journal, 1979