Slot-Specific EVM Display for Mobile Terminal Testing
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Solution Overview
Problem
Conventional mobile communication terminal testing apparatuses struggle to provide detailed analysis and defect detection by averaging EVM values across multiple slots, making it difficult to represent EVM values for each slot effectively.
Innovation Solution
A mobile communication terminal testing apparatus that includes reception signal outputting, modulation accuracy measuring, slot selecting, and display means to show EVM for each symbol in selected slots, allowing for detailed analysis and defect detection by displaying EVM graphs and allocation areas distinctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EVM values are averaged across multiple slots, then the overall modulation accuracy is obtained, but detailed analysis and defect detection capability deteriorates
Solution Approach 1:
The patent divides the EVM measurement into slot-specific segments rather than averaging across all slots. The measurement unit calculates EVM for each slot individually, preserving detailed information about modulation accuracy variations across different time slots. This segmentation allows both overall assessment and detailed defect detection to coexist.
2Loss of information
If EVM is measured for each slot individually, then detailed analysis capability is improved, but the complexity of the testing apparatus increases
Solution Approach 1:
The patent combines multiple functions into the measurement unit: it performs both slot-specific EVM measurement and overall EVM calculation, stores measurement results in memory, and provides display functionality. By integrating these functions into a single apparatus rather than using separate systems, the patent reduces overall system complexity while maintaining detailed measurement capabilities.
3Ease of operation
If conventional averaging method is used, then the testing process is simple, but defect detection and detailed analysis become insufficient
Solution Approach 1:
The patent implements feedback by displaying slot-specific EVM measurements to the user through a display unit. This feedback mechanism allows operators to immediately see modulation accuracy variations across different slots, enabling rapid defect detection and analysis. The feedback loop maintains operational simplicity while dramatically improving reliability through detailed visibility of measurement data.
Data Source
AI summary
There are provided a mobile communication terminal testing apparatus and a method of testing a mobile communication terminal capable of displaying an EVM for each slot. A mobile communication terminal testing apparatus 1 includes a reception unit 12 that receives a transmission signal of a radio frequency from a mobile communication terminal 2, converts the transmission signal into a baseband signal, and outputs the baseband signal as a reception signal having a digital value, an EVM measuring circuit 22 that measures the modulation accuracy of each symbol included in the reception signal, a slot selecting section 32 that selects at least one of a plurality of slots, and a display unit 43 that displays the EVM of each symbol included in the slot selected by the slot selecting section 32.