S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Journal Papers (저널논문_전기·정보공학부)
Fast initialization of Nyquist echo cancellers using circular convolution technique
- Cheong, Minho; Lee, Yong-Hwan
- Issue Date
- IEEE Transactions on Communications, vol. 50, no. 12, pp. 1865-1870, Dec. 2002
- Channel estimation; chirp signals; circular convolution; echo canceler; peak-to-average power ratio (PAR)
- 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. In this letter, 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.
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