Nonlinear Noise Measurement Using Notch Signal Separation
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Solution Overview
Problem
Existing techniques fail to separate nonlinear noise, IQ imbalance, and additive white Gaussian noise in communication systems, making accurate measurement of relevant parameters impossible.
Innovation Solution
An apparatus and method using bilateral and unilateral notch signals, along with multi-tone signals, to measure and calculate power-to-noise ratios, enabling separation and accurate measurement of nonlinear noise, IQ imbalance, and additive white Gaussian noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing measurement techniques are used, then measurement process is simple, but nonlinear noise, IQ imbalance and additive white Gaussian noise cannot be separated
Solution Approach 1:
The patent segments the measurement process into three distinct measurement stages using three different test signals: bilateral notch signal for measuring first power-to-noise ratio, unilateral notch signal for measuring second power-to-noise ratio, and multi-tone signal for measuring additive Gaussian white noise power. This segmentation allows each type of noise to be measured and separated independently, solving the problem of noise mixture while maintaining a systematic measurement approach.
Solution Approach 2:
The patent changes the parameters of the test signals used for measurement. By using different signal types (bilateral notch, unilateral notch, multi-tone) with distinct spectral characteristics, the measurement system can selectively measure different noise components. The spectral properties of these signals are specifically designed to isolate particular noise sources, enabling precise noise separation through parameter-based differentiation.
2Power
If gains of driver amplifier and transimpedance amplifier are increased, then signal strength is improved, but nonlinear noise increases
Solution Approach 1:
The patent extracts and isolates the nonlinear noise component from the total noise spectrum by using bilateral notch signals. The measurement process specifically targets and separates nonlinear noise power from other noise sources, allowing the system to quantify and account for nonlinear noise independently. This extraction enables accurate performance evaluation even when nonlinear noise is present due to high amplifier gains.
Data Source
AI summary
An apparatus and method to measure nonlinear system noises may include a processor to generate a bilateral notch signal, a unilateral notch signal and a multi-tone signal; to measure power of an additive Gaussian white noise of a nonlinear system by using the multi-tone signal; to measure a first power-to-noise ratio of the nonlinear system by using the bilateral notch signal; to measure a second power-to-noise ratio of the nonlinear system by using the unilateral notch signal. The processor is to calculate a nonlinear power-to-noise ratio of the nonlinear system and a power-to-noise ratio introduced by IQ imbalance according to the power of the additive Gaussian white noise, the first power-to-noise ratio and the second power-to-noise ratio.