OTA Test Chamber Calibration via Reference Unit Error Minimization
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Solution Overview
Problem
The inefficiency of requiring multiple test chambers for Over-The-Air (OTA) testing of wireless devices capable of communicating over a wide variety of communication technologies, due to the need to verify performance for each test item across multiple channels and technologies.
Innovation Solution
A method for selecting a reference unit for calibrating OTA testing stations, which involves conducting tests across multiple test items on multiple units, calculating the sum of all errors for each unit, and determining the unit with the lowest sum value as the reference unit for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple test chambers are used for OTA testing of wireless devices supporting multiple communication technologies, then testing completeness and accuracy are improved, but device complexity and testing time are increased
Solution Approach 1:
The patent applies universality by enabling a single test chamber to perform multiple testing functions across different communication technologies (Wi-Fi, Bluetooth, Cellular, UWB, Matter, ZigBee, NFC, mmWave) through calibration with reference units that support diverse protocols. This eliminates the need for separate dedicated test chambers for each technology while maintaining comprehensive testing capability.
Solution Approach 2:
The patent merges multiple testing functions into a single test chamber by establishing a unified calibration system using reference units. Instead of maintaining separate test chambers for each communication technology, the system combines all testing operations into one location, reducing physical infrastructure complexity while preserving testing thoroughness.
2Reliability
If multiple test chambers are used for OTA testing, then testing accuracy for different technologies is improved, but loss of time and productivity are worsened
Solution Approach 1:
A single test chamber performs all OTA testing operations for multiple communication technologies simultaneously through the calibrated reference unit system, eliminating sequential testing across different chambers and reducing total testing time while maintaining accuracy through standardized calibration.
Solution Approach 2:
Reference units are pre-calibrated before actual testing begins. This preliminary calibration establishes accurate measurement baselines that enable rapid and accurate testing of production devices without requiring time-consuming calibration procedures during each individual test, thereby reducing overall testing time while preserving accuracy.
3Adaptability or versatility
If multiple test chambers are used for OTA testing, then comprehensive testing capability is improved, but manufacturing cost is increased
Solution Approach 1:
The patent implements a universal testing system where a single test chamber can accommodate reference units calibrated for multiple communication technologies. This multi-functional approach provides comprehensive testing capability across Wi-Fi, Bluetooth, Cellular, UWB, Matter, ZigBee, NFC, and mmWave while significantly reducing the number of physical chambers required, thereby lowering manufacturing costs.
Solution Approach 2:
The system merges multiple specialized test chambers into a single multi-functional test chamber equipped with interchangeable reference units. This consolidation reduces infrastructure costs, equipment purchases, and facility requirements while maintaining the ability to perform comprehensive OTA testing across all communication technologies.
Data Source
AI summary
System and methods are provided for selecting reference units for calibration of OTA testing stations. Various embodiments include selecting a reference unit for over-the-air (OTA) testing, the selecting including responsive to conducting one or more tests for a plurality of test items on a plurality of units via an OTA testing station, collecting test result values for each of the plurality of test items; calculating a sum of all errors for each of the units, wherein the errors represent a deviation from an average result for each of the test items; determining a unit which exhibits a lowest sum value of all of the errors, wherein the unit is determined as a reference unit for calibrating the OTA testing station; and testing a wireless device with the reference unit.