Transceiver Array Calibration for Amplitude and Phase Drift
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Solution Overview
Problem
Network test devices face challenges in maintaining amplitude and phase accuracy of transceiver arrays, which are crucial for simulating real-world scenarios and testing network nodes, especially in dynamic conditions, due to factors like temperature, aging, and the effects of customer cables and attenuators.
Innovation Solution
A two-phase calibration approach is employed, involving offline and online calibration schemes. Offline calibration compensates for initial amplitude and phase errors, while online calibration continuously corrects for changes caused by drift, temperature, and aging, using low-cost passive hardware and low-level out-of-band signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transceiver array is used for testing network nodes, then comprehensive validation capability is improved, but amplitude and phase accuracy deteriorates over time due to temperature, aging, and cable effects
Solution Approach 1:
The patent applies preliminary action by performing offline calibration before normal operation to establish initial amplitude and phase correction values. This pre-calibration compensates for static errors from cables and attenuators, creating a baseline that maintains accuracy throughout subsequent testing operations.
Solution Approach 2:
The patent implements feedback through online calibration that continuously monitors and corrects amplitude and phase drift during normal operation. The system measures actual performance, compares it against targets, and applies real-time corrections to compensate for temperature variations and aging effects, maintaining reliability over time.
2Reliability
If online calibration is implemented to correct drift and temperature effects, then amplitude and phase accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the transceiver array to perform its own calibration using internal resources. The system uses existing transceivers to measure and correct their own amplitude and phase errors, eliminating the need for external calibration equipment and reducing overall system complexity despite continuous calibration functionality.
Solution Approach 2:
The patent implements universality by designing the calibration system to use the same transceiver array for both normal testing operations and self-calibration. The transceivers serve dual purposes: performing network validation tests and simultaneously monitoring their own amplitude and phase characteristics for correction, thereby avoiding dedicated calibration hardware.
3Measurement precision
If offline calibration is applied to compensate for cable and attenuator effects, then initial accuracy is improved, but it cannot correct dynamic changes during operation
Solution Approach 1:
The patent applies segmentation by dividing calibration into two distinct phases: offline calibration for static corrections and online calibration for dynamic corrections. Each phase addresses specific types of errors, with offline handling cable/attenuator effects and online handling temperature/drift effects, together providing comprehensive accuracy maintenance.
Solution Approach 2:
The patent implements dynamics by transitioning from static offline calibration to dynamic online calibration. The system evolves from initial setup corrections to continuous adaptive corrections that respond to real-time conditions such as temperature changes and component aging, maintaining accuracy throughout the operational lifecycle.
Data Source
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AI summary
In some implementations, a network test device may apply a first calibration scheme to a transceiver array of the network test device using a first calibration signal, wherein the first calibration scheme is to measure a relative frequency response between transceivers of the transceiver array and remove errors associated with the relative frequency response, where the relative frequency response is associated with an amplitude and a phase. The network test device may apply a second calibration scheme to the transceiver array using a second calibration signal, wherein the second calibration scheme is to remove changes in the relative frequency response, where the changes in the relative frequency response are associated with changes in the amplitude and in the phase. The network test device may evaluate a wireless base station using the transceiver array that is calibrated based on the first calibration scheme and the second calibration scheme.