Symbol Timing Correction via Dual Sampling Metrics
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Solution Overview
Problem
In digital communication, receivers face challenges in correctly recovering digital data due to mismatched symbol timing with transmitters, necessitating an effective mechanism for synchronizing symbol timing between the two.
Innovation Solution
A method and apparatus that utilize a timing recovery algorithm to sample signals at half the symbol period, generating multiple timing metrics within a symbol period through data selection and processing, allowing for accurate symbol timing correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver uses conventional sampling at symbol period intervals to generate timing metrics, then the device complexity is low, but the measurement precision of timing error is insufficient for accurate symbol timing correction
Solution Approach 1:
The patent divides the symbol period into multiple sampling intervals by sampling at half the symbol period (2Ts). This segmentation allows generation of multiple timing metrics (first timing metric from even samples, second timing metric from odd samples) within one symbol period, thereby improving timing error measurement precision without excessive complexity increase
Solution Approach 2:
The patent performs more sampling operations than the minimum required (sampling at 2Ts instead of Ts) to generate additional timing metrics. This excessive action provides redundant timing information that improves measurement precision, and the patent manages this complexity through efficient metric combination in the timing error detector
2Manufacturing precision
If the receiver samples at half the symbol period to generate multiple timing metrics, then the symbol timing correction accuracy is improved, but the use of energy increases
Solution Approach 1:
The patent combines multiple timing metrics (first timing metric from even samples, second timing metric from odd samples) into a unified timing error detection process. This merging allows efficient utilization of multiple samples without proportionally increasing energy consumption, as the metrics are processed together in the timing error detector to produce the timing error signal
3Measurement precision
If the receiver processes multiple timing metrics within a symbol period, then the data recovery accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent performs preliminary sampling at half the symbol period to generate multiple data sets before timing metric calculation. This preliminary action organizes the sampled data into even and odd samples, which are then efficiently processed into first and second timing metrics respectively, reducing the overall processing complexity while maintaining high data recovery accuracy
Data Source
AI summary
The present invention provides a method and apparatus for correcting symbol timing of a receiver. The receiver receives a signal transmitted by a transmitter based on a symbol period. The method includes: sampling the signal with a sampling period to generate N sampled data in series, wherein the sampling period is half the symbol period; from Kth data of the N sampled data, getting M data to serve as a first data set; performing a timing recovery algorithm upon the first data set to generate a first timing metric; from (Kth+1) data of the N sampled data, getting M data to serve as a second data set; performing the timing recovery algorithm upon the second data set to generate a second timing metric; and correcting the symbol timing according to the first and second timing metrics.