# US 2014/0153411 A1 · Transmission spectrum selection for locomotive consist communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153411 A1 - Document ID: US20140153411A1 - Status: Published application - Kind: A1 - Application number: 13/690,163 - Filed: 2012-11-30 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Secure Communication Systems Inc.; Electro-Motive Diesel, Inc. - Applicants: Electro-Motive Diesel Inc.; Secure Communication Systems Inc. - Inventors: James Robert LUECKE; Wayne Rudolph - Web page: https://patentgrep.com/patent/US20140153411A1 ## CPC - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/02: Selection of wireless resources by user or terminal - H04W 92/20: between access points - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for transmitting data between access points in a locomotive consist is disclosed. The method may include determining, at a sending access point, the number of locomotives across which a communication signal will be sent. The method may also include selecting, based on the number of determined locomotives, a first transmission spectrum from among one or more transmission spectrums. The method may further include equalizing the communication signal using the selected first transmission spectrum and sending the equalized communication signal to a receiving access point. ## Claims ### Claim 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; and sending the equalized communication signal to a receiving access point. ### Claim 2 (depends on 1) The method of claim 1, further including: monitoring a characteristic of a communication line over which the equalized communication signal is transmitted; and selecting, from the plurality of transmission spectrums, a second transmission spectrum based on the monitored characteristic. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 1) The method of claim 1, wherein the transmission spectrum defines a pre-equalization of a waveform. ### Claim 6 (depends on 1) The method of claim 1, wherein the transmission spectrum alters a bandwidth over which the communication signal is transmitted. ### Claim 7 (depends on 1) The method of claim 1, further comprising: monitoring a characteristic of a communication line over which the equalized communication signal is transmitted; and dynamically generating a new transmission spectrum based on the monitored characteristic. ### Claim 8 (depends on 7) 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) ### Claim 9 (depends on 7) The method of claim 7, further comprising storing the new transmission spectrum in a memory along with the plurality of transmission spectrums. ### Claim 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; and send the equalized communication signal to a receiving access point, ### Claim 11 (depends on 10) The system of claim 10, further including a monitor configured to monitor a characteristic of a communication line over which the equalized communication signal is transmitted and the processor selecting, from the plurality of transmission spectrums, a second transmission spectrum based on the monitored characteristic. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 11) 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. ### Claim 14 (depends on 10) The system of claim 10, wherein the transmission spectrum defines a pre-equalization of a waveform. ### Claim 15 (depends on 10) The system of claim 10, wherein the transmission spectrum alters a bandwidth over which the communication signal is transmitted. ### Claim 16 (depends on 10) The system of claim 10, further including a monitor configured to monitor a characteristic of a communication line over which the equalized communication signal is transmitted and the processor dynamically generating a new transmission spectrum based on the monitored characteristic. ### Claim 17 (depends on 16) 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. ### Claim 18 (depends on 16) 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. ### Claim 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, and send the equalized communication signal to a receiving access point. ### Claim 20 (depends on 19) The locomotive consist of claim 19, further including a monitor configured to monitor a characteristic of a communication line over which the equalized communication signal is transmitted and the processor dynamically generating a new transmission spectrum based on the monitored characteristic.