Multiplex communications – Crosstalk suppression
Patent
1997-02-28
2000-12-12
Vu, Huy D.
Multiplex communications
Crosstalk suppression
370286, H04J 112
Patent
active
061607908
ABSTRACT:
A crosstalk canceller system is disclosed for a transceiver bank, which has one or more transmitters and one or more receivers, for cancelling crosstalk between signals associated with different communications channels having overlapping frequency bands. In a simplified embodiment, the system includes a crosstalk canceller (CC) connected between transmit and receive connections to receive a transmit signal and receive signal, respectively, associated with different communications channels. The CC produces a cancellation signal and passes the cancellation signal to an adder. The adder combines the cancellation signal with the receive signal to generate an enhanced receive signal, which is communicated to the receiver and also back to the CC. The enhanced receive signal is characterized by less crosstalk as compared to the original receive signal. In more complicated embodiments having a transceiver bank with a plurality of transmitters and receivers, a CC can be associated with each transmitter and/or receiver in order to reduce crosstalk imposed upon a single signal (receive or transmit signal) by multiple sources. A control mechanism can be configured to determine and store in a performance table crosstalk contribution values, each of which corresponds with an amount of crosstalk imposed by a particular source to a particular signal connection. The control mechanism implements the CCs relative to each source that has a crosstalk value below a predefined threshold. The control mechanism refrains from implementing the CCs relative to each source that has a crosstalk value of at least the threshold.
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Boakye Alexander
Paradyne Corporation
Vu Huy D.
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