Fast initialization of Nyquist echo cancelers using circular convolution technique

For full-duplex high-speed data transmission over the two-wire line using the same frequency band, it is required to sufficiently suppress the echo. The use of a conventional adaptation method may take a long time to train the echo canceler. Fast training can be achieved by initializing the coeffici...

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Bibliographic Details
Published in:IEEE transactions on communications 2002-12, Vol.50 (12), p.1865-1870
Main Authors: Cheong, Minho, Lee, Yong-Hwan
Format: Article
Language:English
Subjects:
Arithmetic
Autocorrelation
Computer simulation
Convolution
Data communication
Discrete Fourier transforms
Estimates
Filters
Frequency
Frequency bands
High speed
Impulse response
Least squares approximation
Peak to average power ratio
Resonance light scattering
Training
Trains
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Summary:For full-duplex high-speed data transmission over the two-wire line using the same frequency band, it is required to sufficiently suppress the echo. The use of a conventional adaptation method may take a long time to train the echo canceler. Fast training can be achieved by initializing the coefficients of the echo canceler with an estimate of the impulse response of the echo path. We propose a method for fast initialization of the echo canceler by using a circular convolution technique. The proposed method enables the use of real-valued training signals instead of complex-valued ones, resulting in significant reduction of the initialization time as well as the implementation complexity. Finally, the performance of the proposed method is analyzed and verified by computer simulation.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2002.806542