WO1995031867 METHOD AND SYSTEM FOR COMPENSATING FOR COUPLING BETWEEN CIRCUITS OF QUADED CABLE IN A TELECOMMUNICATION TRANSMISSION SYSTEM

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Publication Number WO/1995/031867

Publication Date 23.11.1995

International Application No. PCT/US1995/005061

International Filing Date 27.04.1995

Chapter 2 Demand Filed 11.12.1995

IPC

CPC

Applicants

BELL COMMUNICATIONS RESEARCH, INC. [US]/[US]

Inventors

LECHLEIDER, Joseph, William

Agents

WHITE, Lionel, N.

Priority Data

08/242,577

13.05.1994

Publication Language English (en)

Filing Language English (EN)

Designated States

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Title

(EN) METHOD AND SYSTEM FOR COMPENSATING FOR COUPLING BETWEEN CIRCUITS OF QUADED CABLE IN A TELECOMMUNICATION TRANSMISSION SYSTEM

(FR) PROCEDE ET SYSTEME POUR COMPENSER LE COUPLAGE ENTRE DES CIRCUITS D'UN CABLE A PLUSIEURS QUARTES EN ETOILE

Abstract

(EN) Coupling between two side circuits and a phantom circuit in a quaded cable (200) is compensated for at the receiving end of a transmission system. Known signals are separately transmitted on each circuit and coupling between each circuit is estimated based on a measured signal received at the receiving end of the quaded cable for initialization. During data transmission, received data signals are modified in accordance with the initially determined coupling to produce estimated transmitted data signals. Reestimation of the coupling between each circuit is performed during data transmission by storing (303) N received data signals and N estimated transmitted data signals on each circuit. The coupling between circuits is determined as a function of the covariance of the N received signals and covariance of the N estimated transmitted signals on each circuit. The reestimated coupling is used to modify (302) subsequent received data signals on each circuit.

(FR) On compense le couplage entre les deux circuits latéraux et un circuit fantôme dans un câble (200) à quarte à l'extrémité de réception d'un système de transmission. Des signaux connus sont transmis séparément sur chaque circuit et le couplage entre chaque circuit est évalué sur la base d'un signal mesuré reçu à l'extrémité de réception du câble à quarte pour une initialisation. Durant la transmission des données, les signaux de données reçus sont modifiés conformément au couplage déterminé initialement pour produire des signaux de données transmis et évalués. Une nouvelle évaluation du couplage entre chaque circuit s'effectue durant la transmission des données en enregistrant (303) N signaux de données reçus et N signaux de données transmis et évalués sur chaque circuit. Le couplage entre les circuits est déterminé en fonction de la covariance des N signaux reçus et de la covariance des N signaux transmis et évalués sur chaque circuit. Le couplage évalué à nouveau est utilisé pour modifier (302) les signaux de données subséquents reçus sur chaque circuit.

H	ELECTRICITY
04	ELECTRIC COMMUNICATION TECHNIQUE
B	TRANSMISSION
3	Line transmission systems
02	Details

H	ELECTRICITY
04	ELECTRIC COMMUNICATION TECHNIQUE
L	TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
5	Arrangements affording multiple use of the transmission path
20	using different combinations of lines, e.g. phantom working

H	ELECTRICITY
04	ELECTRIC COMMUNICATION TECHNIQUE
B	TRANSMISSION
3	Line transmission systems
02	Details

H	ELECTRICITY
04	ELECTRIC COMMUNICATION TECHNIQUE
L	TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
5	Arrangements affording multiple use of the transmission path
20	using different combinations of lines, e.g. phantom working

H	ELECTRICITY
04	ELECTRIC COMMUNICATION TECHNIQUE
B	TRANSMISSION
3	Line transmission systems
02	Details

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1. WO1995031867 - METHOD AND SYSTEM FOR COMPENSATING FOR COUPLING BETWEEN CIRCUITS OF QUADED CABLE IN A TELECOMMUNICATION TRANSMISSION SYSTEM