Methods and systems for reducing crosstalk
At least one example embodiment discloses a system including a processor configured to receive a plurality of upstream pilot signals from a plurality of remote transceivers, respectively, in a time domain, determine channel coefficients based on the plurality of upstream pilot signals, determine filter coefficients based on the channel coefficients and to control transmission of the upstream pilot signals in the time domain to physical layers of a plurality of processing devices, the plurality of processing devices configured to communicate with the plurality of remote transceivers through the processor.
1. A system comprising:
a processor configured to receive a plurality of upstream pilot signals from a plurality of remote transceivers, respectively, in a time domain, determine channel coefficients based on the plurality of upstream pilot signals, determine filter coefficients based on the channel coefficients and to control transmission of the upstream pilot signals in the time domain to physical layers of a plurality of processing devices, the plurality of processing devices configured to communicate with the plurality of remote transceivers through the processor, wherein the processor is configured to transmit initial signals and receive the plurality of upstream pilot signals in the time domain as loop-back signals of the initial signals.
2. The system of claim 1 , wherein the processor is configured to determine the filter coefficients in the frequency domain.
3. The system of claim 1 , wherein the upstream pilot signals are orthogonal frequency-division multiplexing (OFDM) signals.
4. The system of claim 3 , further comprising:
at least one of the plurality of processing devices configured to transmit input data to the processor, the input data being in the time domain and the processor configured transform the input data into the frequency domain, filter the input data in the frequency domain based on the filter coefficients, and transform the filtered input data into output data, the output data being in the time domain.
5. The system of claim 4 , wherein the plurality of processing devices are single-input-single-output devices.
6. The system of claim 1 , wherein the processor is configured to request the plurality of upstream pilot signals from the plurality of remote transceivers.
7. The system of claim 1 , wherein the processor is configured to receive upstream data samples after determining the filter coefficients.
8. The system of claim 1 , wherein the plurality of processing devices are single-input-single-output devices.
9. The system of claim 1 , wherein the processor is a multiple-input-multiple output device.
10. The system of claim 9 , wherein the plurality of processing devices are single-input-single-output devices.
11. The system of claim 9 , further comprising:
the plurality of processing devices, each of the plurality of processing devices configured to transmit input data to the processor, the input data being in the time domain and the processor configured to transform the input data into the frequency domain, filter the input data in the frequency domain based on the filter coefficients, and transform the filtered input data into output data, the output data being in the time domain.
12. The system of claim 11 , wherein the plurality of processing devices are single-input-single-output devices.
13. The system of claim 1 , wherein the processor is configured to receive the plurality of upstream pilot signals as a plurality of digital discrete-time sequences.
14. The system of claim 1 , wherein the processor is configured to communicate with the plurality of processing devices using a plurality of first signals, each first signal being a digital discrete-time sequence.
15. The system of claim 1 , wherein the filter coefficients are near end crosstalk (NEXT) canceller coefficients.
16. The system of claim 1 , wherein the processor is configured to prevent a first processing device from communicating with a first remote transceiver until the processor determines the filter coefficients.
17. The system of claim 1 , wherein the processor is configured to filter communications between the plurality of processing devices and the plurality of remote transceivers, respectively, in a first mode and is configured to generate downstream pilot signals in a second mode.
18. A system comprising:
a processor configured to receive a plurality of upstream pilot signals from a plurality of remote transceivers, respectively, in a time domain, determine channel coefficients based on the plurality of upstream pilot signals, determine filter coefficients based on the channel coefficients and to control transmission of the upstream pilot signals in the time domain to physical lavers of a plurality of processing devices, the plurality of processing devices configured to communicate with the plurality of remote transceivers through the processor, wherein the processor is configured to receive the plurality of upstream pilot signals and transmit downstream pilot signals simultaneously.