Time Offset Compensation in Wireless Synchronization
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Solution Overview
Problem
In wireless communication systems, achieving high accuracy and efficiency in time synchronization between base stations and user equipment while minimizing electrical power consumption and costs is challenging, particularly for user equipment, which requires low-cost and low-power solutions to compensate for sampling and channel time offsets.
Innovation Solution
An apparatus and method that include a sampling time offset estimator, a channel time offset estimator, and a time offset compensator to generate control signals for compensating time offsets in user equipment, allowing for accurate time synchronization with transmitters while using low-cost and low-power components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high accuracy time synchronization is implemented using traditional methods, then time synchronization accuracy is improved, but electrical power consumption and cost increase
Solution Approach 1:
The time offset estimation is divided into two independent components: sampling time offset estimation and channel time offset estimation. This segmentation allows the system to address different sources of time offset separately, improving overall synchronization accuracy without requiring a single complex high-power component. Each estimator can be implemented with optimized power consumption for its specific function.
Solution Approach 2:
The time offset compensator uses a single control signal that combines both sampling time offset and channel time offset information to perform unified time synchronization. This multi-functional approach allows one component to handle multiple aspects of time offset compensation, reducing the need for separate high-power synchronization mechanisms and thereby lowering overall power consumption while maintaining accuracy.
2Measurement precision
If high accuracy time synchronization is implemented using traditional methods, then time synchronization accuracy is improved, but device cost increases
Solution Approach 1:
By segmenting the time offset compensation into separate estimators for sampling offset and channel offset, the system can use simpler, lower-cost components for each function rather than requiring a single complex expensive component. This modular approach reduces overall device cost while maintaining high synchronization accuracy through the combination of specialized estimators.
Solution Approach 2:
The system performs self-correction of time offsets by using the received signal itself to estimate both sampling and channel time offsets. This self-service mechanism eliminates the need for external expensive synchronization hardware or complex calibration equipment, thereby reducing device cost while maintaining high accuracy through autonomous time offset compensation.
3Measurement precision
If sampling frequency is increased to reduce sampling time offset, then time synchronization accuracy is improved, but electrical power consumption increases
Solution Approach 1:
The sampling time offset estimator uses feedback from the received signal to continuously estimate and compensate for sampling time offset. This feedback mechanism allows the system to maintain high synchronization accuracy without needing to continuously increase sampling frequency, thereby avoiding the associated power consumption increase. The estimator adapts to sampling offset variations dynamically.
Solution Approach 2:
Instead of changing the sampling frequency parameter to reduce sampling time offset, the system changes the approach by estimating the sampling time offset separately and compensating for it through the time offset compensator. This parameter change strategy maintains synchronization accuracy while avoiding the power consumption penalty of higher sampling frequencies.
Data Source
AI summary
An apparatus and a method for time synchronization are provided. The method may include estimating a sampling time offset caused by a sampling frequency of an input signal received through a wireless channel; estimating a channel time offset caused by the wireless channel; and compensating a time offset in a time offset compensation unit for time synchronization with a transmitter of an input signal based on a sampling time offset and a channel time offset.