Automatic Phase Calibration for MIMO RF Test Platforms
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Solution Overview
Problem
In test platforms for MIMO RF environments, phase misalignment between signal paths leads to destructive interference, reducing the combined power of signals, which is challenging to address effectively.
Innovation Solution
A method for calibrating the test platform by manipulating phase relationships of signal copies using vector signal addition, determining phase offset adjustments to achieve constructive interference through a switching network with balanced signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If phase relationships are manipulated to achieve constructive interference, then combined signal power is improved, but device complexity increases due to calibration requirements
Solution Approach 1:
The system performs self-calibration by automatically measuring the combined signal power at different phase offsets and identifying the optimal phase relationship without requiring external intervention or complex manual adjustment procedures
Solution Approach 2:
The system uses feedback from power measurements to iteratively adjust phase offsets, where the measured combined power feeds back to determine subsequent phase adjustments until optimal constructive interference is achieved
2Reliability
If phase offset adjustments are made to reduce destructive interference, then signal quality is improved, but measurement precision requirements increase
Solution Approach 1:
The system performs preliminary measurements of combined power at multiple predetermined phase offsets before final calibration, allowing it to identify trends and reduce the precision burden on final measurements by establishing a search pattern
Solution Approach 2:
The system measures power at more phase offset points than strictly necessary (excessive action), which provides redundant data that compensates for measurement precision limitations and enables more robust determination of optimal phase relationships
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures that the combined power from multiple signal paths represents the desired test condition, reducing destructive interference and enhancing signal quality by aligning phase relationships.
Implementation Method 1
Vector signal addition as used in the present specification refers to the superposition of two or more waveforms resulting in a new waveform pattern such that, depending on the phase relationship between the waveforms, the superposition can be constructive or destructive.
Data Source
AI summary
A method is provided for calibrating a test platform to establish a phase relationship between copies of a signal at a measurement location within the test platform. Phase relationships of the copies of the signal traversing signal paths and ending at the measurement location are manipulated. Vector signal addition from the copies of the signal is analyzed as the phase relationships are manipulated to find a phase offset adjustment that establishes a particular phase relationship between the signal paths.