Wireless Radio Tester Interframe Space Marker Timing Error
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Solution Overview
Problem
Current methods for performing timing error measurements in wireless communication systems, such as WLAN, are inefficient and costly due to complex setups required for deriving timing error signals from intersymbol interference.
Innovation Solution
A wireless radio tester that transmits a transmit waveform with an interframe space marker to devices under test, allowing for efficient and cost-effective timing error measurements by analyzing the receive signal and determining timing errors as a time difference between the receive time and the interframe space marker, with the ability to simulate an access point for realistic measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing error measurements are performed using traditional intersymbol interference correlation methods, then measurement capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent introduces an interframe space marker as an intermediary reference signal embedded within the transmit waveform. This marker serves as a mediator between the transmitter and measurement device, providing a clear temporal reference point that simplifies timing error measurement without requiring complex intersymbol interference correlation setups
Solution Approach 2:
The patent creates a simplified copy of the timing reference function by using the interframe space marker instead of deriving timing information from the complex intersymbol interference pattern. This copy approach maintains measurement capability while eliminating the need for complex correlation algorithms and setup
2Measurement precision
If complex correlation-based timing error signal derivation is used, then timing error measurement is possible, but productivity and efficiency decrease
Solution Approach 1:
The interframe space marker is pre-inserted into the transmit waveform at a known position (16 microseconds after the falling edge). This preliminary placement of the reference marker eliminates the need for real-time correlation processing, allowing the measurement device to simply detect the marker's arrival time and calculate timing error directly, thereby significantly improving measurement efficiency
Data Source
AI summary
A wireless radio tester for testing a device under test is provided. The wireless radio tester comprises a generation unit for transmitting a transmit waveform to the device under test, a measurement unit for receiving and analyzing a receive signal received from the device under test, a processing unit for triggering the measurement unit by interframe space marker information, and a IQ data memory configured to provide IQ data for the generation unit in order to form the transmit waveform. In this context, said IQ data comprises an interframe space marker according to the interframe space marker information.