Doppler compensation control for radio transmission
First Claim
1. A Doppler compensation method for radio transmission between a mobile body and a base station, the method comprises the following step of:
- Determining the direction of motion of the mobile body with respect to the active base station;
The method being further wherein the step ofApplying a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without any Doppler compensation.
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Accused Products
Abstract
A Doppler compensation method is used for radio transmission between a mobile body possibly but not exclusively a train and some base station, both mobile body and base station comprise respectively a transceiver connected to an antenna for the radio transmission. The method comprises the step of determining the direction of motion of the mobile body with respect to the active base station i.e. the base station to which a radio transmission link is just built. The method is then followed by the step to apply a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without a Doppler compensation.
43 Citations
14 Claims
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1. A Doppler compensation method for radio transmission between a mobile body and a base station, the method comprises the following step of:
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Determining the direction of motion of the mobile body with respect to the active base station; The method being further wherein the step of Applying a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without any Doppler compensation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A radio frequency device for performing radio transmission between a mobile body and a base station while the radio frequency device comprises a transceiver connected to an antenna and a decision unit determining the direction of motion of the mobile body with respect to the active base station, that decision unit activating some Doppler compensation unit for applying some Doppler compensation on the radio transmission, the radio frequency device is wherein the Doppler compensation unit applies a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without any Doppler compensation.
Specification