Nonlinear Device Correlation Measurement With Distribution Correction
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Solution Overview
Problem
Existing methods for measuring nonlinear correlation parameters, such as total harmonic distortion (THD) and conventional power to noise ratio (PNR), are inaccurate, especially in high bandwidth applications, due to variations in signal probability distribution caused by band-stop filtering.
Innovation Solution
A method and apparatus that involve generating a notch signal through band-stop filtering, calculating a first nonlinear correlation parameter, determining gain compression correction coefficients based on output signals with different probability distributions, and correcting the initial parameter to obtain accurate nonlinear correlation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If band-stop filtering is applied to generate notch signals for PNR measurement, then the measurement process can be simplified, but the signal probability distribution changes causing measurement inaccuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction coefficients based on the known filtering operation's effect on signal statistics. Before performing the actual PNR measurement, the system computes correction factors that account for how band-stop filtering alters the signal's probability distribution. This allows the measurement process to remain simple while compensating for the distribution change mathematically, thus maintaining accuracy without increasing measurement complexity.
2Device complexity
If conventional PNR test method is used, then equipment requirements are reduced, but measurement accuracy deteriorates for non-Gaussian distributed signals
Solution Approach 1:
The patent applies parameter changes by introducing correction coefficients that adjust the PNR calculation based on the signal's probability distribution characteristics. Instead of changing the physical measurement setup or equipment, the system modifies the computational parameters (correction factors derived from signal statistics) to compensate for the filtering effect. This allows accurate measurement of nonlinear noise for non-Gaussian signals using the same simple equipment, thus improving precision without increasing device complexity.
Data Source
AI summary
A method, an apparatus and a system to measure nonlinear correlation parameters of a nonlinear device, a processor to, perform band-stop filtering on a signal to be measured to generate a notch signal, and calculate a first nonlinear correlation parameter of the nonlinear device when the signal to be measured is transmitted according to a first output signal of the nonlinear device after the notch signal is input into the nonlinear device; calculate gain compression correction coefficients according to a second output signal of the nonlinear device after the first input signal is input into the nonlinear. The first input signal and the signal to be measured may have identical power and different signal probability distribution. The processor is to correct the first nonlinear correlation parameter according to the gain compression correction coefficients to obtain a second nonlinear correlation parameter of the nonlinear device when the signal to be measured is transmitted.