I/Q Path Signal Calibration via Loopback Feedback
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Solution Overview
Problem
Existing communication systems face challenges in accurately calibrating image signals due to imbalances in the I path and Q path, leading to low precision in frequency domain selective IQ imbalance correction.
Innovation Solution
A signal calibration method involving the transmission of configurable cosine and sine signals through the I and Q paths, followed by processing using Fourier transformation rules, and subsequent phase and amplitude adjustments to determine and apply cancellation values for precise image signal calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing image signal calibration methods are used, then the calibration process can be performed, but the calibration accuracy is too low due to I path and Q path imbalance
Solution Approach 1:
The patent changes the calibration parameters by using configurable amplitude and phase settings in the signal generator to produce cosine and sine signals with specific characteristics. This allows precise control over the calibration signals to compensate for I/Q path imbalances, thereby improving calibration accuracy while maintaining reliability
Solution Approach 2:
The patent implements a feedback mechanism where the transmitted calibration signals are looped back to the receiving direction through the transmitting amplifier. The received signals are then processed via Fourier transformation to determine phase and amplitude cancellation values, which are used to adjust the calibration. This closed-loop feedback enables high-precision image signal correction by continuously optimizing the cancellation parameters
2Measurement precision
If Fourier transformation processing is applied to the received signal, then phase and amplitude cancellation values can be determined, but the processing complexity increases
Solution Approach 1:
The patent replaces complex manual calibration procedures with automated digital signal processing. By using Fourier transformation to automatically extract phase and amplitude information from the looped-back calibration signals, the system achieves high measurement precision while reducing the need for manual intervention and complex hardware adjustments
Data Source
AI summary
The present disclosure provides a signal calibration method, apparatus and device generated based on an imbalance of I path and Q path. The method includes sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and the Q path respectively, the cosine signal and the sine signal being configured to loop back to a signal receiving direction after passing through a transmitting amplifier; processing a signal obtained by a down converter in the signal receiving direction; performing a phase adjustment and an amplitude adjustment by adjusting the signal generator, gain amplifiers of I path and Q path analog domains, and a corresponding digital domain, so as to determine an appropriate phase cancellation value and an appropriate amplitude cancellation value for an image signal; and calibrating the image signal corresponding to the signal to be calibrated.