Forcing Fixed Transmit Rates for Accurate WLAN RF Testing
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Solution Overview
Problem
Wireless testing of electronic devices often results in erroneous radio-frequency parametric data due to varying link quality, as testers use analysis models inappropriate for the actual transmission rate of the device under test.
Innovation Solution
A system that forces the device under test to transmit control packets at a high data rate, such as 54 Mbps, regardless of link quality, ensuring that captured data is analyzed using a consistent test template, thereby ensuring accurate extraction of radio-frequency parameters like transmit power and error vector magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the device under test transmits data at variable rates based on link quality, then the wireless communication adapts to channel conditions, but the tester cannot accurately analyze the returned packets because it uses an inappropriate analysis model for the unknown transmission rate
Solution Approach 1:
The patent changes the transmission rate parameter from variable to fixed by forcing the device under test to transmit at a predetermined high data rate regardless of link quality. This allows the tester to use a consistent analysis model appropriate for that specific rate, thereby resolving the contradiction between adaptability and measurement precision.
2Device complexity
If the tester uses a consistent analysis model for all transmissions, then the analysis process is simplified, but the model becomes inappropriate for variable transmission rates caused by changing link quality
Solution Approach 1:
By fixing the transmission rate parameter at a predetermined high data rate, the patent enables the use of a single consistent analysis model (such as a 54 Mbps profile) for all transmissions. This resolves the contradiction by making the analysis process simpler while maintaining accuracy through parameter standardization.
3Measurement precision
If the device under test transmits at high data rates regardless of link quality, then the tester can apply a consistent test template for accurate parameter extraction, but the transmission may fail in low-quality link conditions
Solution Approach 1:
The patent applies preliminary action by forcing the device under test to transmit at a predetermined high data rate before link quality degradation can occur. This ensures that the transmission happens at the optimal rate for accurate measurement, and the tester captures the data before link quality becomes too poor to support the high rate, thus resolving the contradiction between precision and reliability.
Data Source
AI summary
A system for performing wireless local area network testing of wireless devices may include a wireless local area network tester and a device under test. The tester and device under test may communicate over a wireless link. To ensure that the tester accurately analyzes test data, a data rate table is used that specifies fixed data transmission rates to be used by the device under test under both high-quality link conditions and low-quality link conditions. This forces the device under test to transmit control packets at the same high data rate during packet loopback testing, regardless of link quality. When the captured control packets are analyzed at the tester, both low-link-quality data and high-link-quality data may be analyzed using a common test template, ensuring accurate results.