Doppler-nulling traveling-wave antenna relays for high-speed vehicular communications
AssigneeEmpire Technology Development LLC
InventorGary L. Duerksen
Life of this patent
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Abstract
An antenna relay system for facilitating wireless communication between mobile terminals on a high-speed rail vehicle and stationary base stations with substantially reduced Doppler shift effects comprises matched traveling wave directional antennas mounted to a high-speed rail vehicle and positioned collinearly alongside the railway. Both antennas continually transmit and receive at a fixed angle relative to the motion of the train so as to circumvent the Doppler shift. The signal transmitted or received by the stationary antenna is conducted to a nearest node for communication with an access network.
Claims33
A method to enhance wireless communications in high-speed vehicles through Doppler-nulling traveling-wave antenna relays, the method comprising:
- aggregating wireless traffic from a plurality of wireless communication devices at an access terminal on a moving vehicle;
- and
- forwarding the wireless traffic to a wireless communication network through a pair of matched traveling-wave directional antennas arranged to transmit and receive signals at a predefined angle such that a Doppler effect on the transmitted and received signals resulting from a motion of a first of the antennas positioned on the moving vehicle relative to a second of the antennas positioned along a path of the moving vehicle introduces zero frequency shift on the signals between the matched traveling-wave directional antennas, wherein the second antenna is conductively coupled to one or more access nodes of the wireless communication network.
A wireless communication system to enable communication between high-speed vehicles and a terrestrial network through Doppler-nulling traveling-wave antenna relays, the system comprising:
- an access terminal adapted to aggregate wireless traffic from a plurality of wireless communication devices on a moving vehicle and forward the aggregated wireless traffic to the terrestrial network through a pair of matched traveling-wave directional antennas, the matched traveling-wave directional antennas arranged to transmit and receive signals at a predefined angle such that a Doppler effect on the transmitted and received signals resulting from a motion of a first traveling-wave directional antenna relative to a second traveling-wave directional antenna introduces zero frequency shift on the signals between the matched traveling-wave directional antennas;
- the first traveling-wave directional antenna affixed to the moving vehicle;
- and
- the second traveling-wave directional antenna positioned along a path of the moving vehicle, wherein the second antenna is conductively coupled to one or more access nodes of the wireless communication network.
A traveling-wave, directional antenna system to enable wireless communication between high-speed vehicles and a terrestrial network, the system comprising:
- a first traveling-wave directional antenna affixed to a moving vehicle adapted to receive aggregated wireless traffic from a plurality of wireless communication devices on the moving vehicle and forward the wireless traffic to the terrestrial network through a matching second traveling-wave antenna, wherein the matched first and second traveling-wave directional antennas are arranged to transmit and receive signals at a predefined angle such that a Doppler effect on the transmitted and received signals resulting from a motion of the first traveling-wave directional antenna relative to the second traveling-wave directional antenna introduces zero frequency shift on the signals between the matched first and second traveling-wave directional antennas;
- and
- the second traveling-wave directional antenna positioned along a path of the moving vehicle and conductively coupled to one or more access nodes of the wireless communication network.
Dependencies are inferred from the claim text.