Method and system for compensating for coupling between circuits

Details Method and system for compensating for coupling between circuits Method and system for compensating for coupling between circuits

1994-05-13

1996-04-23

Hofsass, Jeffery

Telephonic communications

Transmission line conditioning

379416, 379417, 379 1, 379 24, 375231, 375232, 455 63, H04M 334

Patent

active

055111190

ABSTRACT:
In a quaded cable, coupling between circuits (side circuit 1, side circuit 2, and phantom circuit) is compensated for at the receiving end of a transmission system. By transmitting known signals from the transmission end separately on each circuit, coupling between circuits is initially estimated by measuring the signals received at the opposite end on each of the circuits. Following startup, during data transmission the received data signals are modified in accordance with this initially determined coupling between circuits to produce estimated transmitted data signals. During data transmission the coupling between circuits is reestimated by storing (303) N data signals received on each circuit and the corresponding N estimated transmitted data signals on each circuit. The coupling between circuits is determined as a function of the covariance of these N received signals on each circuit and the covariance of these N estimated transmitted data signals on each circuit. The reestimated coupling is then used to modify (302) newly received data signals on each of the circuits. The coupling between circuits is reestimated either after a new data signal is received on each circuit, or after a plurality of data signals are received on each circuit.

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