Dual-Path IQ Measurement Device for Detailed Signal Analysis
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Solution Overview
Problem
Traditional spectrum analyzers provide only scalar values for measurement results, limiting the available information and hindering effective signal analysis.
Innovation Solution
A measurement application device with two dedicated measurement signal paths that convert analog signals into IQ data streams, perform IQ demodulation, and group samples according to predefined criteria, followed by cross-correlation to generate additional information such as error vector magnitude over signal power, constellation points, and time windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If scalar values are output as measurement results, then the measurement process is simple, but the available amount of information is limited
Solution Approach 1:
The patent divides the measurement process into two separate measurement signal paths (first and second paths), each processing the analog measurement signal independently through ADC conversion, IQ data stream generation, and demodulation. This segmentation allows parallel processing of the same signal through different ports, enabling cross-correlation to separate correlated noise from uncorrelated noise while preserving detailed signal information beyond simple scalar values.
2Measurement precision
If two different measurement ports are used for cross-correlation, then correlated noise can be separated from uncorrelated noise, but the device complexity increases
Solution Approach 1:
The patent implements multiple measurement signal paths that are functionally identical but physically separate, allowing each path to perform the same measurement function independently. This multi-functionality enables cross-correlation between ports to separate correlated noise (from the device under test) from uncorrelated noise (from measurement ports), improving measurement precision while maintaining a systematic and scalable architecture.
Data Source
AI summary
The present disclosure provides a measurement application device comprising a first measurement signal path configured to receive an analog measurement signal, and to convert the analog measurement signal into a first digital measurement signal, a first signal processor configured to convert the first digital measurement signal into a first IQ data stream, a first demodulator configured to perform an IQ demodulation on the first IQ data stream and provide a first complex signal data stream, a first selector configured to group samples of the first complex signal data stream according to predetermined criteria, and to output at least one respective first group of samples of the first complex signal data stream, and a respective second signal processing path, wherein a cross-correlator calculates a cross-correlation for the samples of each group pair comprising one of the first groups, and the respective second group. Further, a respective method is provided.