Sub-Nyquist Signal Analysis for Phase Error Separation
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Solution Overview
Problem
Existing multi-coset sampling (MCS) systems face challenges in accurately and efficiently separating errors due to the synchronization of high-speed or large-capacity analog and digital circuits, making it difficult to handle phase rotation and errors effectively.
Innovation Solution
A signal analysis apparatus that branches a target signal into multiple paths with different delay times, samples at a sub-Nyquist rate, performs phase compensation and error detection in the frequency domain, and uses frequency selection to identify and separate error causes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple analog circuits and digital circuits are synchronized and operated in combination for signal processing, then the system can perform comprehensive signal analysis, but it becomes difficult to accurately and efficiently separate errors occurring in one circuit or between circuits
Solution Approach 1:
The patent segments the signal processing system into independent functional modules: multiple ADC circuits operating in parallel, each processing signals independently; a processing unit that handles different signal components separately; and an error separation unit that isolates and identifies errors from specific circuits. This modular segmentation allows errors to be traced to their source circuits without interference from other components, resolving the contradiction between comprehensive signal analysis and error separation accuracy.
2Productivity
If high-speed or large-capacity circuits are used for signal processing, then processing capability is improved, but the complexity of synchronizing and operating multiple circuits increases
Solution Approach 1:
The patent extracts the synchronization function from the complex multi-circuit system and implements it through a centralized control mechanism that coordinates ADC sampling operations. By separating the control function from the processing function, the system maintains high processing speeds while reducing synchronization complexity. The processing unit independently handles signal processing without requiring complex inter-circuit coordination.
3Adaptability or versatility
If multiple ADCs operating at sub-Nyquist rate are arranged in parallel with delay differences, then broadband signal detection is enabled, but the system becomes more complex and error separation becomes difficult
Solution Approach 1:
The patent segments the broadband signal detection function across multiple ADC channels, each handling specific frequency bands. The processing unit applies different processing methods to signals from different channels based on their characteristics. This segmentation enables broadband detection while maintaining manageable system complexity through modular architecture and specialized processing for each channel.
Data Source
AI summary
A signal analysis apparatus includes: a reception unit outputting sampling sequences obtained by adding different delay times and sampling each signal at a sampling rate lower than a Nyquist rate; a time-frequency conversion unit converting each sampling sequence to a frequency domain signal; a signal processing unit collectively performing phase compensation processing and processing for canceling phase rotation between the sampling sequences; a frequency estimation unit estimating frequency of the target signal by determining a sub-Nyquist zone in which the target signal has been folded; a frequency selection unit selecting a frequency group with a higher estimated spectrum amplitude value based on a sum of values for each sub-Nyquist zone, the values being obtained by multiplication of the sampling sequences by the corresponding coefficients; and a separation unit performing separation processing for separation of an error in the target signal by using the frequency group selected.