Cooperative Access Architecture for High Speed Railway

2011 ◽  
Vol 403-408 ◽  
pp. 2839-2842 ◽  
Author(s):  
Fang Dong ◽  
Jun Biao Liu ◽  
Xiao Hui Hu
Keyword(s):  
Frequency Shift ◽  
High Speed ◽  
High Mobility ◽  
Network Connectivity ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Broadband Communication ◽  
High Speed Railway ◽  
Fast Handoff ◽  
Definition Of

With the great demand for broadband communication in high speed railway, new access technologies should be adapted to high mobility which brings Doppler frequency shift and fast handoff. The definition of cooperative range is presented and its influence on network connectivity is studied. The result shows that cooperation can greatly extend a wireless user’s communication range. A novel scheme of cooperative access architecture is proposed to support high-speed users with broadband communication.

Analysis of the Impact on Doppler Frequency Shift of the Signal Caused by Receiver’s High Dynamic Environment

2014 ◽  
Vol 568-570 ◽  
pp. 176-179
Author(s):  
Xiao Jing Du ◽  
Wen Bo Zhang ◽  
Song Bo Wang
Keyword(s):  
Frequency Shift ◽  
High Speed ◽  
Dynamic Environment ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Positioning Accuracy ◽  
High Acceleration ◽  
High Dynamic ◽  
The Impact ◽  
Changing Rate

The Doppler frequency shift of the signal received from receiver carrier in high dynamic environment which means high speed and high acceleration represents different changing rules. The changing rules can make the positioning accuracy become worse and even make the receiver unable to track the signal. On the basis of modeling and simulation of three high dynamic carriers including the aircraft, satellite and ballistic missile, the changing rules of Doppler frequency shift were analyzed using the calculation equation of the Doppler frequency shift. The results show that for the high dyanmic carriers, the larger the velocity of the carrier is, the larger corresponding Doppler frequency shift is and the larger the acceleration of the carrier is, the larger corresponding changing rate of Doppler frequency shift is.

Rotational Doppler Frequency Shift from Time‐Evolving High‐Order Pancharatnam–Berry Phase: A Metasurface Approach

2021 ◽  
pp. 2000576
Author(s):  
Fuyong Yue ◽  
A. Aadhi ◽  
Riccardo Piccoli ◽  
Vincenzo Aglieri ◽  
Roberto Macaluso ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Berry Phase ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
High Order

scholarly journals Broadband Laser Doppler Frequency Shift Emulator for Satellite Laser Communication

2019 ◽  
Vol 11 (6) ◽  
pp. 1-12
Author(s):  
Jinye Li ◽  
Yuan Yao ◽  
Guozhang Wu ◽  
Jiaqing Hou ◽  
Wenqi Yu ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Laser Doppler ◽  
Laser Communication ◽  
Satellite Laser Communication ◽  
Broadband Laser
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