Frequency Compensation Using Weighted Timing Advance Change Rate
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Solution Overview
Problem
In high-speed moving scenarios, conventional frequency synchronization and compensation methods for satellite communications result in residual frequency offsets, leading to increased inter-subcarrier interference and degraded receiving performance due to large Doppler frequency shifts, which complicates frequency tracking and affects compensation effectiveness.
Innovation Solution
A frequency compensation method that determines a Doppler frequency shift value based on a weighted change rate of the timing advance (TA) and performs compensation using this value, reducing complexity and improving precision without increasing terminal complexity, and optionally incorporates pre- or post-compensation with reference signals to further enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frequency tracking and compensation methods are used, then the terminal can perform basic frequency synchronization, but residual frequency offset increases inter-subcarrier interference and degrades receiving performance
Solution Approach 1:
The patent applies preliminary action by calculating the Doppler frequency shift value in advance based on the weighted change rate of timing advance, before performing frequency compensation. This proactive approach allows the terminal to anticipate and compensate for frequency offsets more effectively, reducing residual frequency offset and improving receiving performance without increasing terminal complexity
Solution Approach 2:
The patent employs feedback mechanisms by using the timing advance information and weighted change rate to continuously adjust and refine the frequency compensation. The feedback loop ensures that the frequency compensation precision is continuously improved based on actual channel conditions, thereby reducing inter-subcarrier interference and enhancing overall receiving performance
2Reliability
If frequency compensation is performed to reduce residual frequency offset, then receiving performance improves, but the complexity of frequency tracking increases
Solution Approach 1:
The patent applies self-service by enabling the terminal to autonomously calculate the Doppler frequency shift value using the weighted change rate of timing advance without requiring complex external assistance. The terminal independently performs frequency compensation based on this calculation, improving receiving performance while avoiding the need for increased system complexity
Solution Approach 2:
The patent utilizes parameter changes by transforming the frequency tracking approach from direct frequency estimation to timing advance-based weighted change rate calculation. This parameter transformation simplifies the frequency tracking process while improving compensation accuracy, thereby enhancing receiving performance without increasing terminal complexity
3Measurement precision
If more accurate frequency compensation is implemented, then frequency synchronization precision improves, but signaling overhead increases
Solution Approach 1:
The patent applies the extraction principle by isolating and utilizing only the essential timing advance information and its weighted change rate for frequency compensation calculations. By extracting only the necessary parameters from the available data, the patent achieves accurate frequency synchronization without requiring excessive signaling overhead or additional information exchange
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 improves frequency synchronization and compensation precision, reduces residual frequency offsets, and minimizes signaling overheads, thereby enhancing communication performance in satellite systems.
Implementation Method 1
a main component of a frequency offset is a Doppler frequency shift. After the frequency tracking method and the frequency compensation method in the conventional technology are used, a residual frequency offset exists.
Data Source
AI summary
This application discloses a frequency compensation method and apparatus, to improve performance of frequency compensation. The method includes: determining a change rate of a Doppler frequency shift value based on a weighted change rate of a change rate of a timing advance TA, determining the Doppler frequency shift value based on the change rate of the Doppler frequency shift value, and performing frequency compensation based on the determined Doppler frequency shift value; or determining a frequency offset value based on the Doppler frequency shift value with reference to pre-compensation and based on a reference signal, to further determine a frequency offset value, and performing frequency compensation based on the frequency offset value.