Wireless Clock Skew Calibration Using Air Interface Signals
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Solution Overview
Problem
Existing clock calibration methods for wireless devices, especially those in moving states, are inefficient and costly, with manual calibration being low in precision and labor-intensive, while random frequency sweeping is low in calibration efficiency, and devices without stable clock references face challenges in maintaining accurate clock synchronization.
Innovation Solution
A method and apparatus for calculating clock skew in wireless devices using air interface signals to determine clock skew, including Doppler shift and position information, enabling self-calibration without external references, thereby improving precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration method is used, then clock synchronization accuracy can be improved, but labor cost and time consumption increase significantly
Solution Approach 1:
The terminal device performs self-calibration by autonomously calculating clock skew using air interface signals without requiring external calibration equipment or manual intervention. The device uses its own received signals to determine frequency offsets and adjust its clock, making the system self-sufficient and eliminating labor-intensive manual calibration processes.
Solution Approach 2:
The patent replaces manual mechanical calibration operations with automated signal processing algorithms. By using air interface signals and computational methods to determine clock skew, the system substitutes human-operated mechanical adjustment with electronic signal analysis and automated frequency compensation.
2Productivity
If random frequency sweeping method is used, then calibration speed can be improved, but calibration precision deteriorates
Solution Approach 1:
The terminal device continuously monitors air interface signals and uses the received signal quality and timing information as feedback to calculate clock skew. This feedback mechanism allows the device to adjust its clock frequency based on actual signal conditions, achieving both fast calibration and high precision through iterative optimization.
Solution Approach 2:
The system changes the frequency parameter dynamically by calculating the actual clock skew from air interface signals and adjusting the clock frequency accordingly. This parameter adaptation allows the device to find the optimal frequency setting efficiently without relying on random sweeping, thereby improving both speed and accuracy.
3Measurement precision
If external clock reference devices are used, then clock calibration accuracy can be improved, but device complexity and cost increase
Solution Approach 1:
The terminal device uses its own received air interface signals as the calibration reference, eliminating the need for external clock reference devices. By processing signals already present in the communication channel, the device achieves self-calibration without adding external hardware components, thereby reducing system complexity and cost while maintaining calibration accuracy.
Solution Approach 2:
The air interface signals serve multiple functions: they are used for normal communication and simultaneously for clock calibration. This multi-functionality allows the same signal to provide both data transmission and frequency reference, eliminating the need for separate calibration equipment and simplifying the overall system architecture.
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
Enables precise and efficient clock calibration for wireless devices in various states, reducing labor costs and extending device life cycles by maintaining accurate clock synchronization without external references.
Implementation Method 1
A method and apparatus for calculating clock skew in wireless devices using air interface signals to determine clock skew, including Doppler shift and position information
Data Source
AI summary
The present disclosure provides a clock calibration method. The clock calibration method includes: calculating a clock skew of a terminal device, and calibrating a clock of the terminal device according to the clock skew. The present disclosure further provides a clock calibration apparatus, an electronic device, and a computer-readable medium.