Doppler-nulling traveling-wave antenna relays for high-speed vehicular communictions

A traveling wave antenna, Doppler modulation technology, applied in the direction of antennas, radio relay systems, antennas, etc. suitable for movable objects, can solve the Doppler frequency shift frequency offset, carrier frequency change, frequency loss. problems with interference

Inactive Publication Date: 2014-05-14
EMPIRE TECH DEV LLC
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  • Abstract
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  • Claims
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Problems solved by technology

In turn, receivers need to use selective filters to separate the different carriers, making these systems susceptible to interference caused by frequency mismatches between the transmitter and receiver
The Doppler shift caused by the motion of the transmitter relative to the receiver creates a frequency offset that can become difficult for wireless communication with high-speed vehicles
[0003] Strategies for mitigating Doppler shift such as adjusting the transmission frequency or using a rake receiver in the frequency domain do not correct the underlying problem: changes in carrier frequency introduced by relative motion of the transmit and receive antennas

Method used

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  • Doppler-nulling traveling-wave antenna relays for high-speed vehicular communictions
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  • Doppler-nulling traveling-wave antenna relays for high-speed vehicular communictions

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[0022] In the following detailed description, reference is made to the accompanying drawings which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other examples or implementations may be utilized, and other changes may be made without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the various aspects of the present disclosure, as generally described herein and illustrated in the drawings, may be arranged, substituted, combined, separated and designed in various different configurations, all of which are expressly contemplated and described herein. form part of the invention.

[0023] The present invention is drawn in particular as a method, device, system, arrangement and / or computer program product for improving wirele...

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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.

Description

Background technique [0001] Unless otherwise indicated herein, the materials described in this section are not prior art to the claims in this application and are not admitted to be prior art by inclusion in this section. [0002] Advanced wireless communication systems achieve greater bandwidth efficiency by dividing the communication channel into progressively narrower sub-channels. In turn, receivers need to use selective filters to separate the different carriers, making these systems susceptible to interference caused by frequency mismatches between the transmitter and receiver. The Doppler shift caused by the motion of the transmitter relative to the receiver creates a frequency offset that can become difficult for wireless communication with high speed vehicles. [0003] Strategies for mitigating Doppler shift, such as adjusting the transmission frequency or using a rake receiver in the frequency domain, cannot correct the underlying problem: the change in carrier freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/01H04B7/14
CPCH01Q13/203H04W84/005H01Q1/32H04B7/01
Inventor G·杜尔克森
Owner EMPIRE TECH DEV LLC
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