Coordinated transmission for two-pair digital subscriber lines

Details Coordinated transmission for two-pair digital subscriber lines Coordinated transmission for two-pair digital subscriber lines

1991-03-12

1993-01-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 32, 370 27, 375 60, 375 99, 375102, 379410, H04B 323, H04B 332

Patent

active

051811987

ABSTRACT:
A communication system for coordinated transmission of signals from two data sources over a pair of transmission lines includes a central office transceiver and a remote transceiver terminating the corresponding ends of the pair of transmission lines. Each transceiver includes a transmitter with a complementary receiver. The signal amplitudes propagated on the lines are related to each other according to a prescribed relation that effects enhanced signal-to-noise ratio. The transmitter includes a set of amplification factors determined by the prescribed relation; similarly, the receiver also includes two sets of amplication factors to perform the dual to the transmitter operation. The transmitter incorporates a two-dimensional generalization to a conventional echo canceler, namely, an implementation to cancel both echo and near-end crosstalk interfering components. Also, the receiver incorporates a two-dimensional generalization to a conventional decision feedback equalizer, namely, an implementation to cancel both pre-cursor and post-cursor intersymbol interference as well as far-end crosstalk.

REFERENCES:
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patent: 4615025 (1986-09-01), Vry
patent: 4995031 (1991-02-01), Aly et al.
"Generic Requirements for ISDN Basic Access Digital Subscriber Lines," Bellcore Technical Referebce TR-NWT-000393, Issue 2, Jan. 1991.
"Broad Signal Constraints for Management of the Spectrum in Telephone Loop Cables," J. W. Lechleider, IEEE Trans. on Comm., vol. COM-34, No. 7, pp. 641-646, Jul. 1986.
"Digital Transmissions Systems and Networks," M. J. Miller et al., pp. 173-215, published by Computer Science Press 1987.
"Digital Communications," J. G. Proakis, pp. 381-386 published by McGraw--Hill 1983.
"Digital Subscriber Line Terminals for Use with Correlated Line Codes," J. W. Lechleider, IEEE Trans. on Comm., vol. COM-35, No. 10, pp. 1029-1036, Oct. 1987.

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