Method and apparatus for vectored data communication
View Patent ↗In an embodiment, vector training signals are received. Noise affecting the training signals is evaluated, and a noise indication is thus determined.
1. An apparatus, comprising:
a receiver configured to receive vector training signals transmitted via a communication connection; and
a control circuitry configured to evaluate noise other than crosstalk influencing the vector training signals and to transmit a noise indication via the communication connection based on the noise evaluation and an error signal via the communication connection, the noise indication indicating whether noise other than crosstalk influencing the vector training signals was detected and comprising information regarding a magnitude of such noise, the error signal indicating a deviation between sent and received vector training signals, wherein the control circuitry is configured to evaluate the noise by comparing a deviation of a received synchronization symbol from an expected value with an average deviation between synchronization symbols received and their respective expected values.
2. The apparatus of claim 1 , wherein the noise comprises at least one noise type selected from the group consisting of: impulse noise; temporary noise; and radio frequency ingress noise affecting only a selected number of communication channels.
3. The apparatus of claim 1 , wherein the vector training signals comprise synchronization symbols.
4. The apparatus of claim 3 , wherein the control circuitry is configured to evaluate the noise by evaluating Trellis path metrics.
5. The apparatus of claim 3 , wherein the control circuitry is configured to evaluate the noise by evaluating noise of at least one symbol received immediately adjacent a synchronization symbol.
6. The apparatus of claim 1 , wherein the noise indication is selected from the group consisting of: a flag indicating whether noise was detected; and a multi-bit signal indicating a magnitude of the noise.
7. The apparatus of claim 1 , wherein the control circuitry is configured to transmit the noise indication via a backchannel.
8. The apparatus of claim 1 , wherein the receiver is configured to receive signals via a plurality of communication channels, and the control circuitry is configured to transmit a plurality of noise indications for different communication channels.
9. An apparatus, comprising:
a plurality of transmitters configured to be coupled to communication connections and to transmit vector training signals via the communication connections; and
a vectoring device configured to reduce the influence of crosstalk between at least some of the communication connections by vectoring, wherein the vectoring device is further configured to adapt the vectoring based on error information and non-crosstalk noise information received in response to the transmitting of the vector training signals,
wherein the non-crosstalk noise information indicates whether noise other than crosstalk influencing the vector training signals was detected and comprises information regarding a magnitude of such noise, so that the crosstalk reduction implemented by the vectoring device does not deteriorate with the use of the non-crosstalk noise information,
wherein the error information indicates a deviation between sent and received vector training signals.
10. The apparatus of claim 9 , wherein the vectoring device is configured to extend a time period allocated to the adapting of the vectoring if the non-crosstalk noise information indicates non-crosstalk noise exceeding a predetermined threshold.
11. The apparatus of claim 9 , wherein the vectoring device is configured to terminate the adapting of the vectoring if the non-crosstalk noise information indicates non-crosstalk noise exceeding a predetermined threshold.
12. The apparatus of claim 9 , wherein the vectoring device is configured to disregard an error value associated with noise exceeding a predetermined threshold as indicated by the non-crosstalk noise information.
13. The apparatus of claim 9 , wherein the vectoring device is configured to limit an error value associated with noise exceeding a predetermined threshold as indicated by the non-crosstalk noise information.
14. The apparatus of claim 9 , wherein the non-crosstalk noise information indicates the presence of at least one noise type selected from the group consisting of: impulse noise; temporary noise; and radio frequency ingress noise.
15. The apparatus of claim 9 , wherein the transmitters are configured to transmit DSL signals.
16. The apparatus of claim 9 , wherein the transmitters are configured to transmit modulated sequences of synchronization signals as training signals, wherein sequences assigned to different communication connections are orthogonal to each other.
17. A method of reducing crosstalk for vectored communication, comprising:
receiving vector training signals transmitted via a communication connection; evaluating noise other than crosstalk influencing the vector training signals; and
transmitting a noise indication via the communication connection based on the noise evaluation and an error signal via the communication connection, the noise indication indicating whether noise other than crosstalk influencing the vector training signals was detected and comprising information regarding a magnitude of such noise, the error signal indicating a deviation between sent and received vector training signals, wherein evaluating the noise comprises comparing a deviation of a received synchronization symbol from an expected value with an average deviation between synchronization symbols received and their respective expected values.
18. The method of claim 17 , wherein evaluating the noise comprises evaluating Trellis path metrics.
19. The method of claim 17 , wherein evaluating the noise comprises evaluating noise of at least one symbol received immediately adjacent a synchronization symbol.
20. A method of reducing crosstalk for vectored communication, comprising:
transmitting vector training signals via a plurality of communication connections; reducing the influence of crosstalk between at least some of the communication connections by vectoring; and
adapting the vectoring based on error information and non-crosstalk noise information received in response to the transmitting of the vector training signals,
wherein the non-crosstalk noise information indicates whether noise other than crosstalk influencing the vector training signals was detected and comprises information regarding a magnitude of such noise, so that the crosstalk reduction implemented by the vectoring device does not deteriorate with the use of the non-crosstalk noise information,
wherein the error information indicates a deviation between sent and received vector training signals.
21. The method of claim 20 , wherein adapting the vectoring comprises extending a time period allocated to the adapting of the vectoring if the non-crosstalk noise information indicates non-crosstalk noise exceeding a predetermined threshold.
22. The method of claim 20 , wherein adapting the vectoring comprises terminating the adapting of the vectoring if the non-crosstalk noise information indicates non-crosstalk noise exceeding a predetermined threshold.
23. The method of claim 20 , wherein adapting the vectoring comprises disregarding an error value associated with noise exceeding a predetermined threshold as indicated by the non-crosstalk noise information.
24. The method of claim 20 , wherein adapting the vectoring comprises limiting an error value associated with noise exceeding a predetermined threshold as indicated by the non-crosstalk noise information.