Dual mode LMS nonlinear data echo canceller

Details Dual mode LMS nonlinear data echo canceller Dual mode LMS nonlinear data echo canceller

1989-11-17

1990-12-11

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04M 100

Patent

active

049775910

ABSTRACT:
An adaptive nonlinear data driven echo canceller is disclosed. Unlike other approaches to nonlinear echo cancellation, the inventive echo canceller treats the nonlinearity of the echo path as nonlinear noise associated with transmitting data symbols through a linear echo path. In comparison to a conventional LMS data driven linear echo canceller, the inventive echo canceller utilizes only an additional small random access memory for storing a nonlinear function for estimating the effect of the nonlinear echo path on transmitted data symbols. The same LMS algorithm is used to estimate the linear echo path and the nonlinear function. The signal processing power of a conventional linear data driven LMS echo canceller is sufficient to implement the inventive nonlinear echo canceller and the convergence speed of the nonlinear echo canceller can be less than three times that of the conventional linear LMS echo canceller.

REFERENCES:
patent: 4064379 (1977-12-01), Horna
patent: 4669116 (1987-05-01), Agazzi et al.
E. J. Thomas, "Some Considerations on the Application of the Volterra Representation of Nonlinear Networks to Adaptive Echo Cancellers", B.S.T.J. vol. 50, No. 8, pp. 2797-2805, Oct. 1971.
N. H. Holte and S. Stueflotten, "A New Digital Echo Cancelle- for Two-Wire".
"Subscriber Lines", IEEE Trans. Commun., vol. COM-29, No. 11, pp. 1573-1580.
O. Agazzi, D. G. Messerschmitt, and D. A. Hodges, "Nonlinear Echo Cancellation of Data Signals", IEEE Trans. Commun., vol. COM-30, pp. 2421-2433, Nov. 1982.

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