Systems and methods to mitigate electro-magnetic interference in single twisted-pair-based communication systems

1. A transceiver to communicate in a vehicle via a single twisted-pair Ethernet cable, the transceiver including a transmitter to transmit signals via the single twisted-pair Ethernet cable and a receiver to receive signals via the single twisted-pair Ethernet cable, the transceiver comprising:

an equalizer to receive an input signal received by the transceiver via the single twisted-pair Ethernet cable, the equalizer including

a notch filter to cancel electromagnetic interference from the input signal and to output a filtered signal; and

a slicer to slice the filtered signal;

a signal-to-noise ratio estimator to estimate a signal-to-noise ratio based on an output of the slicer; and

a controller to

control a rate of adapting the equalizer by controlling a rate of change of tap values of the notch filter based on the signal-to-noise ratio,

make a frequency response of the equalizer independent of the electromagnetic interference by controlling the tap values of the notch filter, and

control a gain of an analog front-end of the receiver based on the frequency response of the equalizer.

2. The transceiver of claim 1 , wherein the input signal is a combination of i) a first signal received by the receiver via the single twisted-pair Ethernet cable and ii) an echo cancellation signal from the transmitter transmitting signals via the single twisted-pair Ethernet cable.

3. The transceiver of claim 1 , wherein the electromagnetic interference includes i) narrowband interference and ii) burst noise.

4. The transceiver of claim 1 , wherein the equalizer is a feedforward equalizer, and wherein the notch filter is a finite impulse response filter.

5. The transceiver of claim 1 , wherein the equalizer is a decision feedback equalizer, and wherein the notch filter is an infinite impulse response filter.

6. The transceiver of claim 1 , wherein a number of taps of the notch filter is based on a frequency of the electromagnetic interference to be mitigated.

7. The transceiver of claim 1 , further comprising a forward error correcting decoder to decode the output of the slicer.

8. A transceiver to communicate in a vehicle via a single twisted-pair Ethernet cable, the transceiver including a transmitter to transmit signals via the single twisted-pair Ethernet cable and a receiver to receive signals via the single twisted-pair Ethernet cable, the transceiver comprising:

an equalizer to receive an input signal received by the transceiver via the single twisted-pair Ethernet cable, the equalizer including a notch filter to cancel electromagnetic interference from the input signal;

a power estimator to estimate a power of the notch filter based on tap values of the notch filter; and

a controller to

control a rate of adapting the equalizer by controlling a rate of change of tap values of the notch filter based on the power of the notch filter,

make a frequency response of the equalizer independent of the electromagnetic interference by controlling the tap values of the notch filter, and

control a gain of an analog front-end of the receiver based on the frequency response of the equalizer.

9. The transceiver of claim 8 , wherein the input signal is a combination of i) a first signal received by the receiver via the single twisted-pair Ethernet cable and ii) an echo cancellation signal from the transmitter transmitting signals via the single twisted-pair Ethernet cable.

10. The transceiver of claim 8 , wherein the equalizer is a feedforward equalizer, and wherein the notch filter is a finite impulse response filter.

11. The transceiver of claim 8 , wherein the equalizer is a decision feedback equalizer, and wherein the notch filter is an infinite impulse response filter.

12. The transceiver of claim 8 , further comprising:

a slicer to slice an output of the notch filter; and

a forward error correcting decoder to decode an output of the slicer.

13. A method for communicating in a vehicle using a transceiver to transmit and receive signals via a single twisted-pair Ethernet cable, the method comprising:

receiving, at an equalizer, an input signal received by the transceiver via the single twisted-pair Ethernet cable;

filtering, using a notch filter, the input signal to cancel electromagnetic interference from the input signal;

slicing the filtered signal using a slicer;

estimating a signal-to-noise ratio based on an output of the slicer;

controlling a rate of adapting the equalizer by controlling a rate of change of tap values of the notch filter based on the signal-to-noise ratio;

making a frequency response of the equalizer independent of the electromagnetic interference by controlling the tap values of the notch filter; and

controlling a gain of an analog front-end of the receiver based on the frequency response of the equalizer.

14. The method of claim 13 , wherein the input signal is a combination of i) a first signal received by a receiver of the transceiver via the single twisted-pair Ethernet cable and ii) an echo cancellation signal from a transmitter of the transceiver transmitting signals via the single twisted-pair Ethernet cable.

15. The method of claim 13 , wherein the electromagnetic interference includes i) narrowband interference and ii) burst noise.

16. The method of claim 13 , wherein the equalizer is a feedforward equalizer, and wherein the notch filter is a finite impulse response filter.

17. The method of claim 13 , wherein the equalizer is a decision feedback equalizer, and wherein the notch filter is an infinite impulse response filter.

18. The method of claim 13 , further comprising selecting a number of taps of the notch filter based on a frequency of the electromagnetic interference to be mitigated.

19. The method of claim 13 , further comprising decoding the output of the slicer using a forward error correcting decoder.

20. A method for communicating in a vehicle using a transceiver to transmit and receive signals via a single twisted-pair Ethernet cable, the method comprising:

receiving, at an equalizer, an input signal received by the transceiver via the single twisted-pair Ethernet cable;

filtering, using a notch filter, the input signal to cancel electromagnetic interference from the input signal;

estimating a power of the notch filter based on tap values of the notch filter;

controlling a rate of adapting the equalizer by controlling a rate of change of tap values of the notch filter based on the power of the notch filter;

making a frequency response of the equalizer independent of the electromagnetic interference by controlling the tap values of the notch filter; and

controlling a gain of an analog front-end of the receiver based on the frequency response of the equalizer.

21. The method of claim 20 , wherein the input signal is a combination of i) a first signal received by a receiver of the transceiver via the single twisted-pair Ethernet cable and ii) an echo cancellation signal from a transmitter of the transceiver transmitting signals via the single twisted-pair Ethernet cable.

22. The method of claim 20 , wherein the equalizer is a feedforward equalizer, and wherein the notch filter is a finite impulse response filter.

23. The method of claim 20 , wherein the equalizer is a decision feedback equalizer, and wherein the notch filter is an infinite impulse response filter.

24. The method of claim 20 , further comprising:

slicing the filtered signal using a slicer; and

decoding an output of the slicer using a forward error correcting decoder.