Method and system for crosstalk cancellation
First Claim
1. A signal processing system, for applying a crosstalk estimate to a first communication channel to compensate for crosstalk coupled into the first communication channel from a second communication channel, comprising:
- a model, coupled to the second communication channel, operative to generate the crosstalk estimate, comprising;
a waveform shaper comprising a plurality of delay stages coupled to a plurality of respective amplifiers; and
an adjustable delay coupled to the waveform shaper; and
a controller, operative to process crosstalk compensated communication signals and adjust the waveform shaper and the adjustable delay.
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Accused Products
Abstract
Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.
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Citations
42 Claims
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1. A signal processing system, for applying a crosstalk estimate to a first communication channel to compensate for crosstalk coupled into the first communication channel from a second communication channel, comprising:
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a model, coupled to the second communication channel, operative to generate the crosstalk estimate, comprising; a waveform shaper comprising a plurality of delay stages coupled to a plurality of respective amplifiers; and an adjustable delay coupled to the waveform shaper; and a controller, operative to process crosstalk compensated communication signals and adjust the waveform shaper and the adjustable delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for processing a first communication signal having crosstalk from a second communication signal comprising the steps of:
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sampling the second communication signal; processing the sample of the second communication signal to generate a crosstalk emulation signal; applying the crosstalk emulation signal to the first communication signal to cancel at least some of the crosstalk; generating a third communication signal based on the application of the crosstalk emulation signal; analyzing the third communication signal; and adjusting the crosstalk emulation signal based on the analysis, wherein the adjusting step comprises timing the crosstalk emulation signal to match the crosstalk. - View Dependent Claims (10, 11, 12, 13)
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14. A method for processing a first communication signal having crosstalk from a second communication signal comprising the steps of:
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sampling the second communication signal; processing the sample of the second communication signal to generate a crosstalk emulation signal; applying the crosstalk emulation signal to the first communication signal to cancel at least some of the crosstalk; generating a third communication signal based on the application of the crosstalk emulation signal; analyzing the third communication signal; and adjusting the crosstalk emulation signal based on the analysis, wherein; the processing step comprises synchronizing the crosstalk emulation signal with the crosstalk to a level of synchronization; and the adjusting step comprises improving the level of synchronization.
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15. A signal processing method, comprising the steps of:
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transmitting a test signal over a first communication channel; coupling a portion of the test signal from the first communication channel into a second communication channel via a crosstalk effect; defining a model of the crosstalk effect based on processing the portion of the test signal coupled into the second communication channel via the crosstalk effect; transmitting a first communication signal over the first communication channel; coupling a portion of the first communication signal into the second communication channel via the crosstalk effect; transmitting a second communication signal over the second communication channel; processing a portion of the first communication signal with the model and outputting an estimate of the portion of the first communication signal coupled into the second communication signal via the crosstalk effect; and compensating for the crosstalk effect by applying the estimate to the second communication channel. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A signal processing system, for correcting crosstalk coupled from a first communication channel into a second communication channel, comprising:
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a modeling filter, coupled to the first communication channel, operative to generate an estimate of the crosstalk, comprising; an adjustable analog filter, controllable by a modeling input; and an adjustable delay coupled to the adjustable analog filter; and an analysis circuit, operative to analyze crosstalk corrected signals and adjust the adjustable analog filter and the adjustable delay. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An apparatus, for correcting crosstalk in a data communications system, comprising:
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a crosstalk modeling filter that models a crosstalk response; a difference node that subtracts the modeled crosstalk response from a communication signal, comprising the crosstalk, to yield a crosstalk-compensated signal, and a control circuit that processes the crosstalk-compensated signal and adjusts the crosstalk modeling filter to reduce residual crosstalk in the crosstalk-compensated signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification