Symbol Rate Detection from Grouped Pulse Width Analysis
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Solution Overview
Problem
Existing methods for determining the symbol rate of an input signal without a dedicated clock signal are inaccurate if the initial estimate is far off from the real value, as they rely on an estimated starting value and do not account for varying pulse widths within the signal.
Innovation Solution
A method that determines the symbol rate by analyzing pulse widths within the input signal, allocating them to groups based on magnitude, calculating group pulse widths, and using these to determine the symbol rate without an initial estimate, incorporating error margins and perturbation filtering to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an estimated starting value is used for symbol rate determination, then the determination process can be initiated, but the determined symbol rate may be far off from the real value if the estimate is inaccurate
Solution Approach 1:
The patent segments the pulse width measurements into multiple groups based on their magnitude relationships. By dividing the pulse widths into groups and analyzing the ratios between groups, the method eliminates the need for an accurate initial estimate and achieves reliable symbol rate determination through systematic classification and comparison of pulse width segments.
Solution Approach 2:
The patent changes the parameter of pulse width measurement from absolute values to relative ratios. By measuring pulse widths in units of the smallest pulse width and analyzing integer relationships between grouped pulse widths, the method transforms the determination problem into a parameter-based analysis that does not require prior knowledge of the symbol rate magnitude.
2Device complexity
If only a single pulse width measurement is used, then the determination process is simple, but the accuracy of the determined symbol rate is reduced
Solution Approach 1:
The patent merges multiple pulse width measurements into grouped categories based on their magnitude relationships. By combining multiple pulse width data points into groups and analyzing the integer ratios between groups, the method achieves high measurement precision while maintaining manageable process complexity through systematic classification.
Solution Approach 2:
The patent employs feedback by iteratively refining the group assignments and ratio calculations. The method uses the measured pulse widths to determine group assignments, then uses the group ratios to verify and refine the symbol rate determination, creating a feedback loop that enhances accuracy without proportionally increasing complexity.
Data Source
AI summary
A symbol rate determination method for determining a symbol rate of an input signal is disclosed. The method comprises: receiving the input signal; determining respective pulse widths of pulses contained in the input signal; allocating the pulse widths to groups based on a magnitude of the respective pulse widths; determining a group pulse width for each of the groups, the group pulse width being representative of the pulse widths contained in the respective group; and determining the symbol rate based on the determined group pulse widths. Moreover, a measurement instrument for determining a symbol rate of an input signal is disclosed.