Adaptive echo cancellation and equalization system signal proces

Details Adaptive echo cancellation and equalization system signal proces Adaptive echo cancellation and equalization system signal proces

1986-02-25

1988-07-26

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

047605960

ABSTRACT:
A concurrent echo cancellation and channel equalization signal processor for hybrid full duplex communication, including a decision device and three transversal adaptive filters, in which the gain coefficients of the three transversal filters are adjusted in accordance with a fast Kalman algorithm to minimize the error between the estimated far end signal after it has passed through a hybrid (produced by summing the filter outputs) and the estimated received far end signal (produced by the decision device).

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"Adaptive Equalization", S.U.H. Qureshi, Proceedings of the IEEE, vol. 73, No. 9, Sep. 1985, pp. 1349-1387.
"Adaptive Filters", Cowan et al., Prentice Hall, Inc., Englewood Cliffs, N.J. 1985, pp. 14-28 and 227.
"Application of Fast Kalman Estimation to Adaptive Equalization" Falconer et al., IEEE Transactions on Communications, Oct. 1978.
"Design Considerations for a 144 kbit/s Digital Transmission Unit for the Local Telephone Network", Gerwen et al., IEEE Journal on Selected Areas in Communications, Vol.SAC-2, No. 2, Mar. 1984.

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