Echo cancelling device providing adjustment of the echo cancelle

Details Echo cancelling device providing adjustment of the echo cancelle Echo cancelling device providing adjustment of the echo cancelle

1990-05-11

1992-07-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

051329638

ABSTRACT:
In the echo-cancelling device of the invention new decision-error directed algorithms are developed which permit to maintain adaptivity of the echo coefficients and perform precise tracking of the far-end echo phase in a computationally efficent manner during full-duplex operation. The echo-cancelling device comprises an adjust device (40) performing the minimization of the mean-square error obtained as the difference between the signal at the output of the equalizer (Z) and the data-symbol decision (a), for providing the adjustment of the near echo estimator (20) coefficients, of the far echo estimator (22) coefficients, and of the phase (26) of the estimated far echo.

REFERENCES:
patent: 4232400 (1980-11-01), Yamamoto et al.
patent: 4887257 (1989-12-01), Belloc et al.
patent: 4887258 (1989-12-01), Belloc et al.
patent: 4970715 (1990-11-01), McMahan
patent: 4987569 (1991-01-01), Ling et al.
Nachrichtentechnische Zeitschrift N.T.Z., vol. 36, No. 11, Nov. 1983, pp. 726-732, Berlin, DE; W. Grosch et al., "Ein Vollduplexmodem mit adaptiver Sprecherecholoschung zer Ubertragung von 4800 bit/s uber Fernsprechkanale".
IEEE Transactions on Communications, vol. COM-30, No. 9, Sep. 1982, pp. 2095-2108, New York, Agazzi et al., "Large-Scale Integration of Hybrid-Method Digital Subscriber Loops".

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