Satellite Synchronization Signal Doppler Compensation for NTN Reception
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Solution Overview
Problem
In satellite communication networks, the Doppler effect causes significant frequency shifts due to the high orbital velocity of satellites, leading to poor reception performance if the receiver does not account for the shifted center frequency.
Innovation Solution
A method for correcting the Doppler effect in non-terrestrial network (NTN) communication involves identifying a synchronization raster using a global synchronization channel number (GSCN) and adjusting the transmission frequency of the synchronization signal block (SSB) based on the identified raster, allowing terminals to connect to satellite-based base stations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite communication networks use high orbital velocity satellites, then coverage area and network capability are improved, but Doppler effect causes significant frequency shifts leading to poor reception performance
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying Doppler frequency shift compensation before signal transmission. The base station determines the Doppler shift amount based on satellite orbital parameters and terminal location, then pre-adjusts the transmission frequency to counteract the expected Doppler effect, ensuring accurate reception despite high satellite velocity
Solution Approach 2:
The patent changes the frequency parameter of the synchronization signal by applying Doppler compensation. The base station modifies the transmission frequency based on calculated Doppler shift values, adjusting the signal parameters to counteract the frequency displacement caused by satellite motion, thereby maintaining reliable communication
2Device complexity
If the receiver does not account for Doppler shifted center frequency, then device complexity is reduced, but reception performance deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by having the base station pre-compensate for the Doppler effect in the transmitted signal. This counteracts the frequency shift before it affects the receiver, allowing terminals to receive signals at the expected center frequency without requiring complex Doppler correction mechanisms, thus maintaining simple receiver design while ensuring reliable reception
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables accurate synchronization and effective signal exchange between terminals and base stations by compensating for the Doppler shift, improving reception performance in satellite communication systems.
Implementation Method 1
the Doppler effect causes significant frequency shifts due to the high orbital velocity of satellites
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting data transmission rates higher than that of a 4G communication system such as LTE. More particularly, the present disclosure relates to a method and apparatus in which a base station transmits a synchronization signal via a satellite and a terminal detects the synchronization signal in a communication system.