Near-end crosstalk cancellation
AssigneeGenesis Technical Systems Corp.
InventorsDavid W. Linney, Stephen Peter Cooke, Peter Khoury
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Abstract
The present disclosure relates to near-end crosstalk (NEXT) cancellation. A transmit communication signal is transmitted over a first Digital Subscriber Line (DSL) connection using a first group of frequencies and a receive communication signal is received over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies. A crosstalk correlation between the first and second communication signals is determined. Based on the crosstalk correlation, a crosstalk cancellation signal is generated. The crosstalk cancellation signal is subtracted from the second communication signal, with the intention of reducing NEXT.
Claims18
A communication device comprising:
- a transmitter to transmit a first communication signal over a first Digital Subscriber Line (DSL) connection using a first group of frequencies;
- a receiver to receive a second communication signal over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies;
- a Near-End Crosstalk (NEXT) canceller, coupled to the transmitter and to the receiver, to determine a crosstalk correlation between the first communication signal and the second communication signal, to generate a crosstalk cancellation signal based on the crosstalk correlation, and to subtract the crosstalk cancellation signal from the second communication signal,
- wherein the NEXT canceller comprises a coefficient generator to generate respective sets of crosstalk coefficients corresponding to different relative phase alignments between the first communication signal and the second communication signal, a memory coupled to the coefficient generator to store the crosstalk coefficients, and multipliers coupled to the memory to apply a set of the crosstalk coefficients to the first communication signal based on a current phase alignment between the first communication signal and the second communication signal, to generate the crosstalk cancellation signal.
A method comprising:
- determining a crosstalk correlation between a first communication signal that is transmitted over a first Digital Subscriber Line (DSL) connection using a first group of frequencies and a second communication signal that is received over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies;
- generating a crosstalk cancellation signal based on the crosstalk correlation;
- subtracting the crosstalk cancellation signal from the second communication signal;
- wherein determining the crosstalk correlation comprises generating respective sets of crosstalk coefficients corresponding to different relative phase alignments between the first communication signal and the second communication signal, and storing the crosstalk coefficients to a memory, and
- wherein generating the crosstalk cancellation signal comprises applying a set of the crosstalk coefficients to the first communication signal based on a current phase alignment between the first communication signal and the second communication signal, to generate the crosstalk cancellation signal.
Dependencies are inferred from the claim text.