System for cancelling echo signals

Details System for cancelling echo signals System for cancelling echo signals

1988-02-16

1990-06-26

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

049378139

ABSTRACT:
An adaptive compensator circuit is provided which includes a first echo compensator, responsive to data signals from the transmitter, for providing a first compensation signal for compensating an echo signal component which is linearly related to the digital signals to be transmitted. A second echo compensator, responsive to both the first compensation signal and the corrected received signal provides a second compensation signal for compensating the nonlinear echo signal component. An adder, responsive to the first and second echo compensation signals, provides a summed compensation signal. The data signals from the receiver are corrected by means of the summed compensation signal. In another embodiment, the second echo compensator is responsive to both the corrected received signal and the current symbol being transmitted by the transmitter and the (N-1) preceding symbols.

REFERENCES:
patent: 4464746 (1984-08-01), Snijders et al.
patent: 4695998 (1987-09-01), Schollmeier et al.
patent: 4760596 (1988-07-01), Agrawal et al.
"Large-Scale Integration of Hybrid-Method Digital Subscriber Loops", Agazzi et al., IEEE Transactions on Comm., vol. COM30, No. 9, Sep. 1982, pp. 2095-2108.
van Gerwen et al.; "Ein Integrierter Echokompensator zur Basisband-Datenubertragung"; Philips Technische Rundschan 39, 1980/81; pp. 82-98. (no translation).
Agazzi et al.; "Nonlinear Echo Cancellation of Data Signals"; IEEE Transactions on Communications, vol. COM-30, No. 11, Nov. 1982; pp. 2421-2433.
Cesar-Corredera et al.; "Data Echo Nonlinear Cancellation"; ICASSP 85, 32.4.1, Mar. 1985; pp. 1245-1248.
Holte et al.; "A New Digital Echo Canceler for Two-Wire Subscriber Lines"; IEEE Transactions on Communications, vol. COM-29, No. 11, Nov. 1981; pp. 1573-1581.

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