Dynamic Threshold Waveform Detection for Mobile Terminal Testing
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Solution Overview
Problem
Existing mobile terminal testing apparatuses struggle to accurately obtain the waveform of transmission signals when the signal-to-noise ratio is low, as the noise floor causes the signal level during off periods to exceed the set threshold, even in high gain mode.
Innovation Solution
A mobile terminal testing apparatus that includes a pseudo base station unit and a test control unit, which adjusts the power of the transmission signal to have specific on and off periods, performs measurements in different power ranges, and determines dynamic thresholds based on these measurements to accurately capture the waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant threshold is set to detect the transmission signal, then the detection simplicity is improved, but the measurement precision deteriorates when the signal-to-noise ratio is low because the noise floor causes the signal level during off periods to exceed the threshold
Solution Approach 1:
The patent applies dynamics by transitioning from a constant threshold to a time-varying threshold that adapts to the signal characteristics. The threshold is dynamically adjusted based on the measured signal power during on-periods and off-periods, allowing accurate waveform detection even when noise floor varies. This resolves the contradiction by making the threshold flexible rather than fixed, improving measurement precision while maintaining operational simplicity through automated adaptation.
Solution Approach 2:
The patent changes the threshold parameter from a constant value to a dynamically calculated value based on signal measurements. By measuring signal power during different periods and calculating thresholds that adapt to actual signal conditions, the system maintains detection simplicity while achieving high measurement precision under varying signal-to-noise ratios.
2Measurement precision
If the gain is increased to improve the signal-to-noise ratio, then the measurement precision is improved, but the saturation level is reached which causes distortion of the measured waveform
Solution Approach 1:
The patent uses dynamics by implementing variable gain control that adapts to signal strength. Instead of using a fixed high gain that causes saturation, the system dynamically adjusts the gain level based on measured signal conditions, ensuring optimal signal-to-noise ratio without exceeding the saturation point. This resolves the contradiction by making gain adjustment flexible and adaptive rather than static.
Solution Approach 2:
The patent applies feedback by using measured signal power information to control subsequent measurement parameters. The system measures signal characteristics, uses this information to calculate appropriate thresholds and adjust gain levels, and repeats the process. This feedback loop ensures high measurement precision while preventing saturation distortion, as the system continuously adapts based on actual signal conditions.
3Loss of information
If measurements are performed during both on-period and off-period to capture complete waveform, then the measurement completeness is improved, but the measurement time increases
Solution Approach 1:
The patent applies segmentation by dividing the measurement process into distinct on-period measurements and off-period measurements. By separating these measurement phases and using different threshold criteria for each, the system efficiently captures complete waveform information without unnecessary redundant measurements, resolving the contradiction between completeness and time efficiency.
Solution Approach 2:
The patent uses preliminary action by performing off-period measurements first to establish baseline threshold values before conducting on-period measurements. This preliminary measurement of noise floor characteristics allows for optimized subsequent measurements, reducing total measurement time while ensuring complete waveform capture with appropriate threshold settings for each phase.
Data Source
AI summary
A test control unit executes first measurement of changing the power of a transmission signal transmitted by the mobile terminal in a first range and second measurement of changing the power of the transmission signal transmitted by the mobile terminal in a second range lower than the first range, determines a first threshold TH1 and a second threshold TH2 based on the measurement result 21 of the second measurement, and divides the measurement period into a first measurement period Tr1, a second measurement period Tr2, and a third measurement period Trc, based on the first threshold TH1 and the second threshold TH2. The test control unit determines, as a test result, a measurement result 21 measured in the second measurement in the first measurement period Tr1 and the second measurement period Tr2, and a measurement result 20 measured in the first measurement in a third measurement period Trc.


