Joint adaptive echo canceller and equalizer for two-wire full-du

Details Joint adaptive echo canceller and equalizer for two-wire full-du Joint adaptive echo canceller and equalizer for two-wire full-du

1976-09-07

1978-02-14

Claffy, Kathleen H.

Telegraphy

Systems

Printing

178 58R, H04B 324

Patent

active

040740862

ABSTRACT:
An adaptive equalizer and echo canceller jointly respond to a common error difference between the actual output and the quantized digital output of a data receiver in a two-wire digital data transmission system to achieve simultaneous full-bandwith full-duplex operation. Two-wire transmission channels are typically terminated in hybrid balancing networks which because of their fixed impedances permit "echoes" of the transmitted signal to interfere with reception of the much weaker incoming signal. Both the equalizer and canceller are adaptively adjustable transversal structures.

REFERENCES:
patent: RE27250 (1971-12-01), Lucky
patent: 3597541 (1971-08-01), Proakis et al.
patent: 3732410 (1973-05-01), MacKechnie
patent: 3878468 (1975-04-01), Falconer et al.
patent: 3922505 (1975-11-01), Hoge
Koll & Weinstein; "Simultaneous Two-way Data Transmission Over a Two-wire Circuit"; I.E.E.E. Transactions on Communications; vol. COM-21, No. 2; Feb. 1973; pp. 143-147.

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