Symbol Synchronization Circuit Using Cross-Correlation and Auto-Correlation
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Solution Overview
Problem
Conventional symbol synchronization methods in wireless local area networks often result in decoding errors due to inaccuracies in positioning the boundary of wireless signals, especially at low signal-to-noise ratios.
Innovation Solution
A method and circuit that performs cross-correlation and auto-correlation operations on input signals to accurately determine the ending position of symbols, where cross-correlation results are accumulated and corrected using auto-correlation results to enhance synchronization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-correlation operation or auto-correlation operation is performed to position the preamble ending position, then the signal receiving terminal can attempt to detect the boundary position of the wireless signal, but errors are very likely to occur in subsequent positioning which results in decoding errors
Solution Approach 1:
The patent segments the correlation operation into two distinct stages: first performing cross-correlation to obtain a preliminary ending position, then performing auto-correlation to correct this position. This segmentation allows each operation to serve a specific purpose - cross-correlation provides initial estimation while auto-correlation refines the accuracy, thereby resolving the contradiction between detection capability and positioning reliability
Solution Approach 2:
The patent applies preliminary action by first performing cross-correlation operation to obtain a preliminary ending position before conducting the final auto-correlation operation. This preliminary positioning step prepares the system with an initial estimate that guides the subsequent refinement process, improving overall positioning accuracy while maintaining operational efficiency
Data Source
AI summary
A symbol synchronization method is provided according to an embodiment of the disclosure. The method includes: receiving an input signal which includes a plurality of symbols; performing a cross-correlation operation on a plurality of first samples of the input signal according to a known sequence of a first type symbol among the symbols to obtain a plurality of cross-correlation results; accumulating the cross-correlation results to obtain an ending position of the first type symbol; delaying a plurality of second samples of the input signal according to a length of a second type symbol among the symbols to perform an auto-correlation operation; and correcting the ending position according to an operation result of the auto-correlation operation. In addition, a corresponding signal receiving circuit is provided according to an embodiment of the disclosure.