Multi-Band Frequency Offset Estimation Using Cross-Band Correction
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Solution Overview
Problem
In communication systems supporting multiple operating frequency bands, frequency offset estimation at higher frequencies is inaccurate due to greater interference, leading to a higher likelihood of exceeding tolerable frequency offset thresholds and affecting communication stability.
Innovation Solution
The method involves separately performing frequency offset estimation on both low and high-frequency signals, combining the results using weighted processing to determine a comprehensive frequency offset estimation, and performing frequency offset correction based on this result to improve accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency offset estimation is performed on high-frequency signals, then communication coverage is extended, but measurement precision deteriorates due to greater interference
Solution Approach 1:
The patent uses low-frequency signals as an intermediary to assist in estimating the frequency offset of high-frequency signals. The low-frequency signal serves as a reference that is less affected by interference, and its frequency offset estimation results are used to correct or supplement the high-frequency signal estimation, thereby improving overall measurement precision while maintaining high-frequency communication capability
Solution Approach 2:
The patent changes the frequency parameter by performing frequency offset estimation on both low-frequency and high-frequency signals separately, then combining the results. This parameter-based approach allows the system to leverage the advantages of different frequency ranges (low-frequency stability and high-frequency coverage) to resolve the contradiction between coverage and precision
2Productivity
If frequency offset estimation is performed on high-frequency signals, then communication bandwidth is increased, but reliability deteriorates due to exceeding frequency offset thresholds
Solution Approach 1:
The patent implements a feedback mechanism where the frequency offset estimation results from low-frequency signals are used to correct or validate the high-frequency signal estimation. This feedback loop ensures that the final frequency offset correction applied to high-frequency signals is accurate and within tolerable thresholds, thereby maintaining communication reliability while preserving bandwidth benefits
Solution Approach 2:
The patent performs frequency offset estimation on low-frequency signals in advance to establish a reliable reference value before processing high-frequency signals. This preparatory step cushions against potential estimation errors in high-frequency signals, ensuring that the final correction remains within acceptable thresholds and prevents communication failures
Data Source
AI summary
This application provides a communication method, apparatus, device, and system, and a readable storage medium, and relates to the communication field. The method includes: after obtaining a first-frequency signal and a second-frequency signal that have a same clock signal, separately performing frequency offset estimation on the first-frequency signal and the second-frequency signal to obtain a first-frequency offset estimation value and a second-frequency offset estimation value; and then correcting the second-frequency offset estimation value based on the first-frequency offset estimation value, that is, comprehensively performing calculation based on the first-frequency offset estimation value and the second-frequency offset estimation value to obtain a frequency offset estimation result.