Granted Patent B2

US 9,019,918 · App. 13/690,163 · Granted Apr 28, 2015

Abstract

Claims (40)

1. A method for transmitting data between access points in a locomotive consist, the method comprising:

determining, at a sending access point, the number of locomotives across which a communication signal will be sent;

selecting, based on the number of determined locomotives, a first transmission spectrum from among a plurality of transmission spectrums;

equalizing the communication signal using the selected first transmission spectrum;

sending the equalized communication signal to a receiving access point; and

monitoring a characteristic of a communication line over which the equalized communication signal is transmitted, wherein the monitored characteristic includes an operation as a master clock synchronized with one or more other clocks operating in the consist.

2. The method of claim 1 , further including:

selecting, from the plurality of transmission spectrums, a second transmission spectrum based on the monitored characteristic.

3. The method of claim 2 , further including:

equalizing a second communication signal using the selected second transmission spectrum; and

sending the second communication signal to the receiving access point.

4. The method of claim 2 , wherein the monitored characteristic includes a signal-to-noise ratio of the communication line, a signal level of the communication signal, or a packet error rate.

5. The method of claim 1 , wherein the transmission spectrum defines a pre-equalization of a waveform.

6. The method of claim 1 , wherein the transmission spectrum alters a bandwidth over which the communication signal is transmitted.

7. The method of claim 1 , further comprising:

dynamically generating a new transmission spectrum based on the monitored characteristic.

8. The method of claim 7 , wherein dynamically generating the new transmission spectrum includes selectively modifying a plurality of sub-carriers within an orthogonal frequency-division multiplexing (OFDM) signal.

9. The method of claim 7 , further comprising storing the new transmission spectrum in a memory along with the plurality of transmission spectrums.

10. A system for transmitting data between access points in a locomotive consist, comprising:

one or more memories storing instructions; and

one or more processors configured to execute the instructions to:

determine, at a sending access point, the number of locomotives across which a communication signal will be sent;

select, based on the number of determined locomotives, a first transmission spectrum from among a plurality of transmission spectrums;

equalize the communication signal using the selected first transmission spectrum;

send the equalized communication signal to a receiving access Point; and

monitor a characteristic of a communication line over which the equalized communication signal is transmitted, wherein the monitored characteristic includes an operation as a master clock synchronized with one or more other clocks operating in the consist.

11. The system of claim 10 , wherein the one or more processors are further configured to select, from the plurality of transmission spectrums, a second transmission spectrum based on the monitored characteristic.

12. The system of claim 11 , wherein the one or more processors are further configured to equalize a second communication signal using the selected second transmission spectrum and send the second communication signal to the receiving access point.

13. The system of claim 11 , wherein the monitored characteristic includes a signal-to-noise ratio of the communication line, a signal level of the communication signal, or a packet error rate.

14. The system of claim 10 , wherein the transmission spectrum defines a pre-equalization of a waveform.

15. The system of claim 10 , wherein the transmission spectrum alters a bandwidth over which the communication signal is transmitted.

16. The system of claim 10 , wherein the processor dynamically generates a new transmission spectrum based on the monitored characteristic.

17. The system of claim 16 , wherein the one or more processors are further configured to dynamically generate the new transmission spectrum by selectively modifying a plurality of sub-carriers within an orthogonal frequency-division multiplexing (OFDM) signal.

18. The system of claim 16 , wherein the one or more memories are further configured to store the new transmission spectrum in a memory along with the plurality of transmission spectrums.

19. A locomotive consist comprising:

a plurality of locomotives;

a communications network;

a plurality of access points disposed within locomotives of the locomotive consist and communicatively coupled to the communications network; and

a processor configured to determine, at a sending access point, the number of locomotives across which a communication signal will be sent, select, based on the number of determined locomotives, a first transmission spectrum from among a plurality of transmission spectrums, equalize the communication signal using the selected first transmission spectrum, send the equalized communication signal to a receiving access point, and monitor a characteristic of a communication line over which the equalized communication signal is transmitted, wherein the monitored characteristic includes an operation as a master clock synchronized with one or more other clocks operating in the consist.

20. The locomotive consist of claim 19 , wherein the processor dynamically generates a new transmission spectrum based on the monitored characteristic.

Assignments (8)