Interpolated Waveform Construction for Accurate Eye Diagrams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for generating an eye diagram in communication systems are either destructive, requiring timing shifts that lead to error-prone data samples, or costly, necessitating additional hardware like second ADCs and DSP equalization circuitry.
Innovation Solution
A method and system that interpolate data using delayed replicas of a filter with stored coefficients to construct a waveform from sampled data, allowing for accurate eye diagram formation without the need for extra circuits, using finite-length filters and fractional delay techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing shift is applied to generate eye diagram data, then eye diagram can be formed, but data samples become error-prone and normal link operation is halted
Solution Approach 1:
The patent segments the filter into M delayed replicas, each with K taps. This segmentation allows the system to process N sampled data points through multiple parallel filter replicas, generating N×M interpolated data points without requiring timing shifts on the main data path, thus maintaining data accuracy while enabling eye diagram formation.
Solution Approach 2:
The patent applies preliminary interpolation using delayed filter replicas to generate additional data points before eye diagram construction. By pre-processing the sampled data through multiple filter replicas with stored coefficients, the system creates a comprehensive data set that enables accurate eye diagram formation without disrupting normal link operation or compromising data integrity.
2Reliability
If auxiliary slicer with separate timing control is used, then non-destructive eye diagram generation is achieved, but hardware cost increases significantly
Solution Approach 1:
The patent makes the existing filter serve multiple functions: it processes the main data path signals for normal communication operation and simultaneously generates interpolated data points for eye diagram construction. By reusing the existing filter structure with M delayed replicas and stored coefficients, the system eliminates the need for separate auxiliary slicers and additional ADCs, achieving non-destructive eye diagram generation without significant hardware cost increase.
Solution Approach 2:
The patent creates M delayed replicas of the filter, each being a simplified copy with K taps and stored coefficients. These replicas generate interpolated data points by processing the same N sampled data points, providing the necessary data for eye diagram construction without requiring a complete duplicate of the ADC and DSP equalization circuitry, thus reducing hardware cost while maintaining data integrity.
3Measurement precision
If additional ADC and DSP equalization circuitry are added, then accurate eye diagram can be generated, but hardware cost and complexity increase
Solution Approach 1:
The patent creates M delayed replicas of the filter, each being a simplified copy with K taps and stored coefficients. These replicas generate interpolated data points by processing the same N sampled data points, providing the necessary data for eye diagram construction without requiring a complete duplicate of the ADC and DSP equalization circuitry, thus reducing hardware cost while maintaining data integrity.
Data Source
AI summary
A method of constructing a waveform from N sampled data captured at N successive points in time, includes, in part, applying the N sampled data, K data at a time, to each of M delayed replicas of a filter that includes K taps so to generate N×M interpolated data. The waveform is then constructed from the N sampled data and the N×M interpolated data.